TCM8010-50 SLWS009A TCM8002 TCM8010 VDD/256 S-PDFP-G44 - Datasheet Archive

 

AMPS/TACS AUDIO PROCESSOR SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 · · · · ·

 

TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 · · · · · · · · FR PACKAGE (TOP VIEW) M1N M1P M1O TXVO CIN CVE CTC CMPR CO TXVI DATA TACS and AMPS Operation Integrated RX and TX Voice Filters Integrated RX and TX Data Filters RX and TX Narrow-Band SAT Filters RX Data Recovery Comparator Preemphasis and Deemphasis Filtering Adjustable TX Limiter Microphone Preamplifiers Digitally Controlled Gains and Signal Selection or Muting Three 8-Bit DACs With Output Buffers 8-Bit ADC With Input Multiplexer DTMF Generator On-Chip Compandor Flexible Clock or Oscillator Operation Simple 3-Wire Digital Interface Low-Power, 2-mA Standby Current 44-Pin Mini QFP (FR) Package 44 43 42 41 40 39 38 37 36 35 34 M2P M2N M2O POUT LIMIN TXO VMID ANLG VDD REF RXIN RXO 1 33 2 32 3 31 4 30 5 29 6 28 7 27 8 26 9 25 10 24 11 23 XTO XTI DGTL VDD DAC3 DAC2 DAC1 CS DCLK TXSA TXDA ADC2 12 13 14 15 16 17 18 19 20 21 22 EXIN ETC EXO RXVI CTI SP1 SP2 VSS RXDO RXSO ADC1 · · · · · · · · · description The TCM8010-50 TCM8010-50 is a complete advanced mobile phone service (AMPS) / total access communications system (TACS) audio processor built using the Texas Instruments Advanced LinBiCMOSTM technology and packaged in a 44-pin mini QFP (FR) package. This device provides a highly integrated solution for analog-signal processing in mobile and hand-held FM cellular telephones while conserving circuit board area and vertical height within the finished product. All necessary voice and data filters, and all appropriate antialiasing and smoothing filters are incorporated in the device. Continuous-time filters are used for the anti-aliasing and smoothing functions and switched-capacitor techniques are used only where appropriate. Ancillary functions such as microphone preamplifiers, differential loudspeaker outputs, CCITT-compatible compander, dual tone multi-frequency (DTMF) generator, three 8-bit digital-to-analog converters (DACs), and an 8-bit analog-to-digital converter (ADC) with input multiplexer are also included in the device. A simple 3-wire serial interface provides digital control of signal-path switching, muting and gain adjustment, the 8-bit DACs, transmit (TX) limit level, DTMF code and amplitude, ADC multiplexer input select, and allows the ADC output to be read. In active mode, the TCM8010-50 TCM8010-50 consumes less than 12 mA of supply current. When the DTMF generator or the ADC are not in operation, the power consumption is even less. The device can be put into a standby mode in which only the receive (RX) data path is active, reducing the supply current to a typical value of 2 mA or less. Either the integrated-clock oscillator or an external clock signal (with several frequency options) can be used. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Advanced LinBiCMOS is a trademark of Texas Instruments Incorporated. Copyright © 1995, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 1 2 8 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 25 31 27 26 34 M2O 3 M2P 2 M2N 1 M1O M1P 43 44 M1N 42 TXSA 24 TXDA DGTL VDD CS DCLK DATA ADC2 23 ADC1 22 VSS 7 VMID 19 REF 9 ANLG VDD RXIN 10 MICSW 1 11 4 4 41 TXVO 38 37 CMPR 36 CTC 40 CO CIN CVE 39 Compressor RX SAT Filter TXVI 35 11 RXO Deemphasis ­ 6 dB Control Bits RXTRIM ± 4 dB MICTRIM ± 4 dB Digital Control 8-Bit ADC functional block diagram 13 ETC TXSW 2 2 9 TXATTEN DTMF Generator SAT Comparator Data Comparator 14 EXO Expander EXIN 12 1 RXSW 2 4 LIMIN 5 Limiter TXSUM 3 LSSW Volume Control ± 15 dB 3 2 4 TXSAT Filter ± 2 dB 4 POUT Preemphasis 6 dB TX Data Filter WB 3 SATSW 16 CTI RXVI 15 5 8-Bit DACS TXTRIM ± 4 dB Low-Pass Filter + 6 dB 10 4 Oscillator 30 29 28 32 TXO DAC3 DAC2 DAC1 XTI XTO RXSO RXDO SP2 SP1 6 33 21 20 18 17 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1995 ­ REVISED DECEMBER 1995 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 Terminal Functions TERMINAL NAME NO. ADC1 ­ ADC2 22, 23 ANLG VDD I/O I 8 DESCRIPTION ADC input 1 and 2 (analog) Analog positive supply CIN 40 I Compressor input (analog) CMPR 37 I Compressor rectifier input (analog) CO 36 O Compressor output, ac coupled to CMPR and to TXVI (analog) CS 27 I Serial interface chip select, active low (digital) CTC 38 O Compressor time constant (analog) CTI 16 I Call tone input (analog and digital) CVE 39 I Compressor virtual ground (analog) DAC1 ­ DAC3 28, 29, 30 O DAC outputs (analog) DATA 34 I/O Serial interface data signal (digital) DCLK 26 I Serial interface clock signal (digital) DGTL VDD 31 ETC 13 EXIN EXO LIMIN M10 M1P/N M2O Digital positive supply O Expander time constant (analog) 12 I Expander input (analog) 14 O Expander output, ac coupled to RXVI (analog) 5 I Limiter input (analog) 42 O Microphone preamplifer 1 output (analog) 43, 44 I Microphone preamplifier 1 differential inputs (analog) 3 O Microphone preamplifer 2 output (analog) M2P/N 1, 2 I Microphone preamplifier 2 differential inputs (analog) POUT 4 O Preemphasis output, ac coupled to LIMIN (analog) REF 9 RXDO 20 RXIN RXO RXSO Midrail reference ­ decouple to Vss with external capacitor O Receive section data output (digital) 10 I Receive section input (analog) 11 O Receive section deemphasis voice filter output (analog) 21 O Receive section supervisory audio tone (SAT) output (digital or analog) RXVI 15 I Voice input to volume control stage (analog) SP1/2 17, 18 O Speaker outputs 1 and 2 (analog) TXDA 24 I Transmit data filter input (digital or analog) TXO 6 O Transmit section output (analog) TXSA 25 I Transmit SAT input (digital or analog) TXVI 35 I Input to TX voice-path output stages (analog) TXVO 41 O Transmit voice input stage output, ac coupled to CIN (analog) VMID VSS 19 XTI/XTO 7 32, 33 Buffered midrail voltage ­ decouple to Vss with external capacitor Negative supply (0 V) Crystal oscillator and clock recovery inputs POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 3 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 absolute maximum ratings over operating free-air temperature range Supply voltage range, VDD (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ­ 0.3 V to 7 V Input voltage, VI (any pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSS ­ 0.3 V to VDD + 0.3 V Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Continuous total power dissipation at (or below) TA = 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 893 mW Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ­ 65°C to 150°C Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltages are with respect to VSS. recommended operating conditions MIN High-level input voltage, VIH MAX 4.5 Supply voltage, DGTL VDD and ANLG VDD NOM 5 5.5 0.8VDD UNIT V V Low-level input voltage, VIL 0.8 Operating virtual junction temperature, TJ 70 ­ 30 V °C electrical characteristics over recommended operating virtual junction temperature range, VDD = 5 V, fxtal = 2.56 MHz PARAMETER MAX 1 1.7 Standby mode, DACs on Analog A l supply current l TYP Standby mode, DACs off IDD(A) MIN 1.4 2 11 16 Operating mode Including DTMF generator IDD(D) 1000 0.5 1.7 mA A 17 160 Operating mode Digital pply Digi l supply current 12 Standby mode UNIT ADC operating 1 REF Midsupply reference voltage Operating mode 2.4 2.5 2.6 VMID Buffered midsupply reference voltage Operating mode 2.4 2.5 2.6 MIN TYP MAX µA mA V analog inputs PARAMETER II Zi Input current at M1P, M1N, M2P, M2N, ADC1, ADC2, CTI µA 1 Input impedance at RXIN, RXVI, LIMIN, TXSA, TXDA 100 Input impedance at EXIN, CIN, CMPR, TXVI UNIT k 25 digital interface PARAMETER IIH IIL fCLK VOH Low-level output voltage MIN Serial clock frequency, DCLK input VOL TEST CONDITIONS High-level input current 4 VI = 5 V VI = 0 V Low-level input current TYP MAX 1 1 1 IOH = 500 µA IOL = 500 µA High-level output voltage POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 0.9 VDD 0.1 VDD UNIT µA MHz V TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 transmit path electrical characteristics input stage gain M1O/M2O to TXVO, VDD = 5 V PARAMETER TEST CONDITIONS MIN MICTRIM = < 1111 > MICTRIM negative range MICTRIM = < 0000 > MICTRIM step size Preamp CMRR dB 4.3 dB ­ 3.8 dB 0.38 MICTRIM positive range 0.5 ­ 4.8 MICTRIM = < 1000 > (see Note 2) MAX ­ 0.5 3.3 Gain 0.68 dB 48 Distortion VI = 1 V, VI = 100 mV, MICSW isolation f = 1 kHz UNIT dB 0.5% f = 1 kHz 50 dB NOTE 2: The control bits associated with a block or function are shown in < >. compressor CIN to CO, VDD = 5 V PARAMETER Unity gain level TEST CONDITIONS MIN 76 TYP MAX UNIT RCOMP compressor resistance This parameter becomes Vref for the relative-linearity-error test conditions. mV dB ­ 0.16 37 127 ± 0.5 ±1 dB 47 67 k MIN MAX UNIT 0.16 Relative linearity error 103 ­ 0.01 VI = Vref + 2 dB to Vref ­ 18 dB VI = Vref ­ 18 dB to Vref ­ 48 dB 0.36 dB output stage TXVI to TXO, VDD = 5 V PARAMETER TEST CONDITIONS TXTRIM step size TXTRIM positive range TXTRIM = < 11111 > 3.5 4.5 dB TXTRIM negative range TXTRIM = < 00000 > ­ 4.8 ­ 3.8 dB TXATTEN step size 7 9 dB 21 TXATTEN range 27 dB MIN MAX UNIT 1900 mVp-p output stage limiter TXVI to TXO, VDD = 5 V PARAMETER TEST CONDITIONS Maximum output signal TXVI = 316 mV, f = 300 Hz to 25 000 Hz, Distortion f = 1 kHz, level at TXO = 2/3 × level measured in previous test, LIM = < 110 > Trim step size, analog test mode A, output at RXDO TXVI = 316 mV Trim positive range, analog test mode A, output at RXDO LIM = < 111 > Trim negative range, analog test mode A, output at RXDO LIM = < 000 > POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 LIM = < 110 > 3% 0.8 1.2 dB 2.5 3.5 dB ­ 4.5 ­ 3.5 dB 5 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 output stage frequency response TXVI to TXO, VDD = 5 V PARAMETER TEST CONDITIONS MIN MAX UNIT ­ 20 dB f = 300 Hz ­ 13.46 ­ 9.46 dB f = 500 Hz ­ 9.02 ­ 5.02 dB f = 2000 Hz 3.02 7.02 dB f = 2500 Hz 4.96 8.96 dB f = 3000 Hz 4.96 10.54 dB f = 5900 Hz ­ 35 dB f = 6000 Hz ­ 35 dB f < 200 Hz 0-dB f 0 dB reference at f = 1 kH , kHz, TXVI = 26 mV Frequency response F overall transmit path electrical characteristics M1O/M2O to TXO, TXATT = , VDD = 5 V PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Compressor bypass gain MICT = < 1000 >, TXT = < 10000 > 10.8 12 13.0 dB Output noise, compressor enabled, M1O/M2O = VMID psophometric weighting RXIN = 400 mV, f = 1 kHz Voice mute attenuation M1O/M2O = 100 mV, f = 1 kHz 2.3 50 mVrms ­80 dB DATA output levels TXDA to TXO, VDD = 5 V PARAMETER Output level Frequency response TEST CONDITIONS AMPS TACS AMPS TACS MIN ­ 3 dB relative to 1 kHz, kHz mVp-p 1188 mVp-p 17 22 kHz 14.4 TX data mute attenuation UNIT 1188 1070 Analog test mode B MAX 1070 fI = 10-kHz square wave, amplitude 0 V to 5 V fI = 8-kHz square wave, amplitude 0 V to 5 V 17.6 kHz 50 dB SAT output levels TXSA to TXO, VDD = 5 V PARAMETER MAX 95 116 mV 2 2.3 dB ­2.7 ­2.3 dB 0.2 0.4 dB ­ 35 dB f = 4.8 kHz ­ 25 dB f = 5.1 kHz ­ 20 dB ­5 0.5 dB f = 5.94 kHz ­ 0.5 0.5 dB f = 6.06 kHz ISAT = < 0 >, MIN f < 3 kHz Output level TEST CONDITIONS ­ 0.5 0.5 dB fI = 6-kHz square wave, amplitude 0 V to 5 V SAT trim positive range SAT trim negative range SAT trim step size f = 5.8 kHz Frequency response F q y p 0-dB f 0 dB reference at f = 6 kH kHz, ISAT = < 0 > f = 6.2 kHz dB ­ 20 dB f > 9 kHz 6 0.5 f = 7.2 kHz TX SAT mute attenuation ­5 UNIT ­ 35 dB 50 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 dB TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 SAT output level RXIN to TXO, RXT = < 1000>, SAT = < 1000>, TXT = < 10 000 >, VDD = 5 V PARAMETER TEST CONDITIONS Output level ISAT = , MIN Input to RXIN = 6-kHz sine wave, amplitude 600 mV TYP MAX 400 UNIT mV receive path electrical characteristics input stage RXIN to RXO, VDD = 5 V PARAMETER TEST CONDITIONS MIN MAX UNIT Gain RXTRIM = < 1000 > ­ 6.3 ­ 5.2 dB RXTRIM positive range RXTRIM = < 1111 > 3.2 4.2 dB RXTRIM negative range RXTRIM = < 0000 > ­ 4.5 ­ 3.8 dB 0.39 0.69 dB ­ 28 dB RXTRIM step size f 5900 Hz expander EXIN to EXO, VDD = 5 V PARAMETER TEST CONDITIONS MIN Unity gain level = Vref 80 130 mV ­ 0.3 ±1 dB EXIN = Vref ­ 2.8 dB to Vref ­ 23.8 dB Relative linearity error 100 EXIN = Vref + 9.5 dB to Vref ­ 2.8 dB ­ 0.8 ±2 dB 47 71.6 k MIN MAX UNIT REXP expander resistance This parameter becomes Vref for the relative-linearity-error test conditions. 37.5 output stage PARAMETER TEST CONDITIONS Gain RXVI to SP1/SP2 0.5 1.5 dB VOL = < 1111 > 13 15 dB Negative range Volume control V l l VOL = < 1000 > Positive range VOL = < 0000 > ­ 16.5 ­ 15.5 dB Step size CTI input 1.75 dB 0 2 dB VOL = < 1000 > Expander bypass gain from RXIN to SP1/SP2 2.25 VOL = < 1000 > Gain to SP1/SP2 ­ 5.5 ­4 dB 500 Output voltage at SP1/SP2 RL = 500 Distortion at SP1/SP2, expander enabled RXIN = 400 mV, Noise at SP1/SP2, expander bypassed RXIN = 400 mV, Vp-p RXIN = VMID, psophometric weighting Voice mute attenuation 2.5 Output load at SP1/SP2 f = 1 kHz, No load f = 1 kHz 2% 3 50 mV dB RX DATA comparator RXIN to RXDO, VDD = 5 V PARAMETER TEST CONDITIONS Must-detect level Must-not-detect level MIN MAX 210 f = 4 kHz 5 kHz kHz, kHz, 8 kHz, and 10 kHz Output duty cycle 40 RXIN = 900 mV peak to peak POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 47.5% UNIT mVp-p 52.5% 7 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 RX SAT frequency response RXIN to RXSO, SATDIG = < 1 >, VDD = 5 V PARAMETER TEST CONDITIONS MIN MAX UNIT f < 3 kHz ­ 35 dB f = 4.8 kHz ­ 25 dB f = 5.1 kHz ­ 19 dB f = 5.8 kHz 0-dB f 0 dB reference at f = 6 kHz kH ­5 0.5 dB f = 5.94 kHz ­ 0.5 0.5 dB f = 6.06 kHz Frequency response F q y p ­ 0.5 0.5 dB f = 6.2 kHz 0.5 dB f = 7.2 kHz ­5 ­ 20 dB f > 9 kHz ­ 35 dB MAX UNIT RX SAT comparator RXIN to RXSO, SATDIG = < 0 >, VDD = 5 V PARAMETER TEST CONDITIONS Must-detect level TYP 64 f = 6 kHz MIN 30 mVrms miscellaneous block electrical characteristics digital-to-analog converters DAC1, DAC2, and DAC3 PARAMETER TEST CONDITIONS MIN Output voltage at code 255 DACX2 = < 1 > Output voltage at code 255 DACX2 = < 0 > TYP VDD ­ 130 VDD /2 ­100 MAX UNIT mV VDD /2 + 100 55 mV Zero code offset 13 mV Differential nonlinearity (codes 5 ­ 250) 0.3 1 LSB Integral nonlinearity (codes 5 ­ 250) 0.3 1 LSB analog-to-digital converter, DCLK = 160 kHz, VDD = 5 V PARAMETER TEST CONDITIONS Full scale for inputs ADC1, ADC2, and VMID MIN TYP 2.3 MAX 2.6 UNIT V Differential nonlinearity 0.5 1 LSB Integral nonlinearity 0.5 1 LSB 200 kHz Clock rate (DCLK) 8 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 DTMF generator transmit levels at TXO, TXTRIM = < 10 000 >, VDD = 5 V PARAMETER DTTR 697-Hz tone, low tone TEST CONDITIONS 1477-Hz tone, high tone UNIT 153 164.9 mV 340 348.6 mV 61 78 88 mV 140 TACS mode MAX 300 < 0100 > 697-Hz tone, low tone TYP 108 AMPS mode 1477-Hz tone, high tone MIN 175 190 mV < 0000 > ­ < 0001 > dB < 0001 > ­ < 0010 > 0.4 dB < 0010 > ­ < 0011 > 0.4 dB < 0011 > ­ < 0100 > 0.5 dB < 0100 > ­ < 0101 > 0.5 dB < 0101 > ­ < 0110 > 0.6 dB < 0110 > ­ < 0111 > DTMF trim steps i p 0.4 0.6 dB < 0111 > ­ < 1000 > 0.7 dB < 1000 > ­ < 1001 > 0.7 dB < 1001 > ­ < 1010 > 0.8 dB < 1010 > ­ < 1011 > 0.9 dB < 1011 > ­ < 1100 > 1.0 dB < 1100 > ­ < 1101 > 1.1 dB ­ < 1110 > 1.3 dB < 1110 > ­ < 1111 > 1.5 dB Positive range < 0100 > ­ < 1111 > 7.1 9.8 12.1 dB Negative range ­ < 0000 > ­ 2.7 ­ 1.9 ­1 dB 1.3 1.85 2.2 dB Skew, change in level of high tone < 0100 > Distortion products < 0100 > Relative to low tone ­ 30 dB DTMF generator receive levels at SP1 and SP2, DTTR = < 0100>, VOL = < 1000>, VDD = 5 V PARAMETER TEST CONDITIONS Distortion products MAX 58 67 mV TACS mode All tones MIN AMPS mode 29 35 mV ­ 40 dB Relative to low tone POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 UNIT 9 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 TYPICAL CHARACTERISTICS TX VOICE FREQUENCY RESPONSE TX PASS-BAND DETAIL 15 10 Av ­ Voltage Amplification ­ dB Av ­ Voltage Amplification ­ dB 20 0 ­ 10 ­ 20 ­ 30 ­ 40 ­ 50 5 0 ­5 ­ 10 ­ 15 ­ 60 ­ 70 100 10 1000 ­ 20 100 10000 f ­ Frequency ­ Hz Figure 1 RX PASS-BAND DETAIL 15 10 Av ­ Voltage Amplification ­ dB Av ­ Voltage Amplification ­ dB 20 0 ­ 10 ­ 20 ­ 30 ­ 40 10 5 0 ­5 ­ 10 ­ 15 ­ 50 1000 10000 ­ 20 100 f ­ Frequency ­ Hz 1000 f ­ Frequency ­ Hz Figure 3 10 10000 Figure 2 RX VOICE FREQUENCY RESPONSE ­ 60 100 1000 f ­ Frequency ­ Hz Figure 4 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 10000 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 TYPICAL CHARACTERISTICS TX SAT FREQUENCY RESPONSE TX PASS-BAND DETAIL 1 10 0 Av ­ Voltage Amplification ­ dB Av ­ Voltage Amplification ­ dB 0 ­ 10 ­ 20 ­ 30 ­ 40 ­1 ­2 ­3 ­4 ­5 ­6 ­7 ­ 50 ­ 60 0 ­8 2000 4000 6000 8000 ­9 5500 10000 5700 f ­ Frequency ­ Hz 5900 6100 6300 6500 f ­ Frequency ­ Hz Figure 5 Figure 6 RX SAT FREQUENCY RESPONSE RX PASS-BAND DETAIL 10 1 0 Av ­ Voltage Amplification ­ dB Av ­ Voltage Amplification ­ dB 0 ­ 10 ­ 20 ­ 30 ­ 40 ­ 50 ­ 60 2000 ­1 ­2 ­3 ­4 ­5 ­6 ­7 ­8 4000 6000 8000 10000 ­9 5500 5700 5900 6100 6300 6500 f ­ Frequency ­ Hz f ­ Frequency ­ Hz Figure 7 Figure 8 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 11 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 TYPICAL CHARACTERISTICS TX DATA FREQUENCY RESPONSE ­ AMPS TX DATA FREQUENCY RESPONSE ­ TACS 5 0 0 Av ­ Voltage Amplification ­ dB Av ­ Voltage Amplification ­ dB 5 ­5 ­ 10 ­ 15 ­ 20 ­5 ­ 10 ­ 15 ­ 20 ­ 25 ­ 25 1000 10000 ­ 30 1000 100000 10000 f ­ Frequency ­ Hz Figure 9 Figure 10 COMPRESSOR LINEARITY EXPANDER LINEARITY 1 0.4 0.8 0.3 0.6 0.2 Linearity Error ­ dB Linearity Error ­ dB 0.5 0.1 0 ­ 0.1 ­ 0.2 0.2 0 ­ 0.2 ­ 0.6 ­ 0.4 ­ 0.5 ­ 50 0.4 ­ 0.4 ­ 0.3 ­ 0.8 ­ 40 ­ 30 ­ 20 ­ 10 0 10 20 Input Step ­ dB ­1 ­ 30 ­ 25 Figure 11 12 100000 f ­ Frequency ­ Hz ­ 20 ­ 15 ­ 10 ­5 Input Step ­ dB Figure 12 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 0 5 10 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 APPLICATION INFORMATION analog cellular telephone baseband solution The TCM8002 TCM8002 and TCM8010-50 TCM8010-50 chip set provides a complete solution to the audio and data filtering, decoding, and encoding required in a cellular telephone for the AMPS or TACS systems. The applications-circuit schematic is shown in Figure 13 and demonstrates that a minimum of external components is required. The following extra functions are included in the TCM8010-50 TCM8010-50 and TCM8002 TCM8002: · · · · Three digital-to-analog converters Analog-to-digital converter Two timers I/O expansion overall description The following paragraphs detail the various function of the TCM8010-50 TCM8010-50 and TCM8002 TCM8002 chip set when used in this application. TCM8010-50 TCM8010-50 transmit path The inputs to the microphone amplifiers are MIC1 and MIC2. MIC1 could be used for the internal microphone and MIC2 for accessories (a hands-free unit). The TCM8010-50 TCM8010-50 is designed for single-supply operation. REF is provided to bias the noninverting inputs of the microphone amplifiers, M1P and M2P. The wideband data to be transmitted is input as a digital signal to TXDA. The TCM8010-50 TCM8010-50 then filters and provides a level trim for the signal. The TCM8002 TCM8002 produces a digitally-filtered signal, phase locked to the received SAT. This is then connected to the input TXSA of the TCM8010-50 TCM8010-50, which filters and provides level adjustment for the digital signal. The output from the TCM8010-50 TCM8010-50 is at TXO and should be connected to the modulator in the RF section. The voice, wideband data, and SAT signal levels are programmable, eliminating the need for external adjustments. TCM8010-50 TCM8010-50 receive path The output from the FM demodulator/discriminator should be connected to the receive audio input (RXIN) of the TCM8010-50 TCM8010-50. Two audio outputs are provided at SP1 and SP2. These can be configured to be two separate outputs, with one driving the phone earpiece and the other for test or accessories (a hands-free unit) for example, or optionally can be configured to provide a differential output to increase the maximum level. The TCM8010-50 TCM8010-50 filters and converts the received wideband data to a digital signal and outputs this at RXDO for connection to the TCM8002 TCM8002. The received SAT signal is filtered and converted to a digital signal. It is then made available at RXSO for transmission to the TCM8002 TCM8002. TCM8010-50 TCM8010-50 digital-to-analog converters Three uncommitted 8-bit DACs are included in the TCM8010-50 TCM8010-50 (DAC1OUT, DAC2OUT, and DAC3OUT). One can be used for power control of the RF transmit amplifier. The other two could be used to provide adjustment voltages for the RF stage such as calibrating the temperature-compensated crystal oscillator (TCXO) and trimming the first intermediate frequency (IF) stage. TCM8010-50 TCM8010-50 analog-to-digital converter Two multiplexed inputs to an ADC included in the TCM8010-50 TCM8010-50 are provided (ADCIN 1 and ADCIN 2). Possible uses are to measure battery voltage (using a potential divider) or received-signal-strength indicator (RSSI) voltage. POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 13 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 APPLICATION INFORMATION TCM8002 TCM8002 transmit path The data encoder includes all the necessary formatting for transmission on the control and voice channels. This digital signal is output at TXOUT. The received SAT digital signal is connected to TCM8002 TCM8002 SATIN and then the signal is recovered from the noise before being measured and regenerated. The digital output signal appears at TCM8002 TCM8002 SATOUT. TCM8002 TCM8002 receive path The received digital data signal is connected to RXIN for the control-and-voice channel data-recovery circuit. The data is then majority voted and error corrected. Finally, an interrupt is generated to signal to the microcontroller that there is received data available. TCM8002 TCM8002 timers A watchdog timer is provided that can reset the microcontroller in the telephone if a fault occurs. This is a requirement of both the AMPS and TACS systems. An uncommitted programmable 8-bit timer is also available with an output labelled TMZERO that pulses low when the count reaches zero. TCM8002 TCM8002 I/O expansion Twenty programmable I/O lines are provided for the telephone microcontroller. These are individually bit-programmable as outputs or inputs with optional current source pullups. An intelligent interface to the audio processor (TCM8010-50 TCM8010-50) provides an automatic audio-mute function when wideband data is being transmitted or received. TCM8002 TCM8002 and TCM8010-50 TCM8010-50 clock and control Both the TCM8002 TCM8002 and TCM8010-50 TCM8010-50 are connected to the microcontroller through the serial interface (CS, DCLK, DATAIN, DATAOUT, INTERRUPT). The TCM8002 TCM8002 can be programmed to generate interrupts when events such as RX data available (data received) or the counter/timer reaching zero state occurs. A low-power crystal oscillator is integrated into the TCM8002 TCM8002, and the CLKOUT output is provided for connection to the TCM8010-50 TCM8010-50. 14 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 APPLICATION INFORMATION TCM8010 TCM8010 Receive Audio Input RXAUDIO RXIN C4 SP1 TXVO SP2 C6 CIN MIC1 R1 C1 R2 M1O M1N Transmit Voice Inputs R3 MIC2 R4 M2O C2 C13 Speaker1 C12 Speaker2 RXO C11 EXIN TXO ETC C15 TXAUDIO C16 M2N CTC RXVI CVE M1P CO M2P CMPR REF C14 VMID C17 C5 R5 C8 C9 TXVI C7 Microprocessor Interface CS DCLK DATAOUT RXSO SATOUT DATAIN DATAOUT POUT SATIN DCLK DATAIN C10 LIMIN TCM8002 TCM8002 CS Transmit Audio Out EX0 R6 C3 Receive Voice Output TXSA RXIN RXDO ADC1 ADCIN1 TXOUT TXDA ADC2 ADCIN2 INTERRUPT INTRPT HNCS CS DAC1 DAC1OUT RESET RESET HCLK DCLK DAC2 DAC2OUT HDATA DATA DAC3 DAC3OUT WATCHDOG WDOUT TIMER TMZERO CLKOUT XT1 RFEN RFEN PIO1 (0:7) R7 XTAL1 X1 C19 PIO2 (0:7) PIO3 (0:3) Transmitter Enable PIO1 (0:7) PIO2 (0:7) C18 Analog I/O PIO3 (0:3) I/O Expansion RCCBUSY/PO(4) RCCBUSY/PO(4) XTAL2 RAEN/PO4(6) RAEN/PO4(6) TAEN/PO4(7) TAEN/PO4(7) Figure 13. Complete Baseband Solution POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 15 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 APPLICATION INFORMATION external component selection COMPONENT DESIGNATION TYPICAL VALUE R1 47 k Microphone preamplifier number 1 gain = R2/R1 R2 47 k Recommended minimum value R3 47 k Microphone preamplifier number 2 gain = R4/R3 R4 47 k Recommended minimum value R5 100 k R6 100 k FUNCTION Provides dc bias for the compressor R7 1 M C1 100 nF Biasing resistor for crystal oscillator AC couples the input to microphone preamplifier number 1 (MIC 1) C2 100 nF AC couples the input to microphone preamplifier number 2 (MIC 2) C3 390 nF Determines the attack and recovery times of the compressor C4 10 nF AC couples the receive audio and data input from the FM demodulator/discriminator C5 47 pF Required for HF stability of the compressor C6 100 nF AC couples the output of the selected microphone preamplifier to the compressor input. This is required because any dc offset would cause linearity errors. C7 100 nF AC couples the output of the preemphasis and bandpass filter to the limiter stage to ensure symmetrical clipping C8 100 nF AC couples the output of the compressor to the transmit switch (TXSW). Since this is also the compressor rectifier input, any dc offset would cause linearity errors. C9 100 nF AC decouples the compressor dc feedback C10 100 nF AC couples the output from the expander to the receive switch (RXSW) C11 100 nF AC couples the input to the expander to remove offsets that would otherwise cause linearity errors at low signal levels C12 - C13 - C14 470 nF Decouples the resistor divider that produces REF, the input for the VMID generator C15 100 nF AC couples the output from the transmit voice, data, and SAT signals to the FM modulator in the RF section C16 330 nF Determines the attack and recovery times of the expander C17 470 nF Provides a low ac impedance reference for the transmit and receive paths C18 33 pF Provides X1 with the required capacitive loading C19 33 pF Provides X1 with the required capacitive loading X1 2.56 MHz Required when the earpiece drive is single ended (not differential) Crystal printed circuit board layout precautions Resistors R5 and R6 should be placed close to the TCM8010-50 TCM8010-50 to minimize stray capacitance between CO and CVE. Otherwise, compressor gain errors are caused at low signal levels and high frequencies. suggested trim sequence The TCM8010-50 TCM8010-50 and TCM8002 TCM8002 are designed so that no manual trims are required. All levels can be adjusted to meet the system requirements and compensate for production tolerances by writing to the digital interface. The data required can then be stored in a nonvolatile memory by the microcontroller in the telephone. When the telephone is turned on, an initialization routine can write this calibration data to the TCM8010-50 TCM8010-50. 16 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 APPLICATION INFORMATION suggested trim sequence (continued) The suggested sequence of adjustments for trimming is detailed below. transmit Step 1. TXTRIM a. Set the TX data trim < DAT2 ­ DAT0 > to nominal = < 100 >. b. Set the TCM8002 TCM8002 and TCM8010-50 TCM8010-50 to transmit signaling tone. c. Adjust < TXT4 ­ TXT0 > to set the frequency deviation to that required by the system, AMPS or TACS. Step 2. TXSAT a. Turn the signaling tone off and turn on the SAT path. Input a 6-kHz signal to RXIN. b. Adjust < SAT3 ­ SAT0 > to give the required frequency deviation. Step 3. MICTRIM a. Mute the signaling tone and SAT. b. Inject an audio signal at the desired level into the microphone preamplifier. c. Adjust < MICT3 ­ MICT0 > to set the frequency deviation. Step 4. LIMITER TRIM a. Increase the audio signal level by 20 dB typically. b. Adjust < LIM2 ­ LIM0 > to produce the required maximum deviation. Step 5. DTMF TRIM a. Mute the signaling tone, audio, and SAT. b. For TACS, set bit < DTSK> to enable the skew of the levels between the low and high tones. c. Turn on the DTMF generator and adjust < DTTR3 ­ DTTR0 > to give the desired frequency deviation. receive Step 6. RXTRIM Input a modulated signal to the telephone and adjust < RXT3 ­ RXT0 > to produce the required level at SP1 and SP2. RF stage Step 7. DACs to trim RF section Three 8-bit DACs can be used to trim sections of the RF stage using < DACCAD1 ­ DACAD0 > to select the DAC and < DAC7 ­ DAC0 > to set the level. < DACX2> sets the range of all three DACs and < DACON> enables all three outputs when the TCM8010-50 TCM8010-50 is in standby. Typical uses would be RF transmit power control, TCXO trim, and first IF section trim. The TCM8010-50 TCM8010-50 is designed for signal levels detailed in the following tables for AMPS and TACS systems. These tables suggest levels for both the transmitted and received audio, SAT, and DATA signals. POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 17 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 APPLICATION INFORMATION transmit signal levels AMPS mode SIGNAL Design level PEAK FREQUENCY DEVIATION (kHz) LEVEL AT TXO 8 Peak voice level 400 12 1697.1 UNIT mVrms mV peak to peak SAT 2 100 DATA 8 1131.4 mV peak to peak mVrms DTMF low tone, 697 Hz 3.1365 156.8 mVrms DTMF high tone, 1477 Hz 6.6465 332.3 mVrms PEAK FREQUENCY DEVIATION (kHz) LEVEL AT TXO UNIT TACS mode SIGNAL Design level 5.7 356.3 mVrms Peak voice level 9.5 1697.6 mV peak to peak SAT 1.7 106.3 mVrms mV peak to peak DATA 6.4 DTMF low tone, 697 Hz DTMF high tone, 1477 Hz 1131.5 1.2 max 75 mVrms 3.19 max 199.4 mVrms LEVEL AT RXIN UNIT receive signal levels AMPS mode SIGNAL Design level PEAK FREQUENCY DEVIATION (kHz) 8 Peak voice level 400 12 1697.1 mVrms mV peak to peak SAT 2 100 DATA 8 1131.4 mV peak to peak mVrms LEVEL AT RXIN UNIT TACS mode SIGNAL PEAK FREQUENCY DEVIATION (kHz) Design level 5.7 356.3 mVrms Peak voice level 9.5 1697.6 mV peak to peak SAT 1.7 106.3 mVrms DATA 6.4 1131.5 mV peak to peak 18 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 PRINCIPLES OF OPERATION general The TCM8010-50 TCM8010-50 consists of a number of functional blocks and is controlled by the digital interface. The control bits associated with each block are shown in the angled brackets symbol < >. In standby mode < STBY>, the receive data path from RXIN to RXDO is on and the DACs can be on or off as required. All other parts of the device, including the crystal oscillator, are off. When in the active mode, the receive and transmit paths and the DAC blocks are continuously on, and the DTMF and ADC blocks are turned on as required. Control bits < MD1 ­ MD0 > set the TCM8010-50 TCM8010-50 for the desired system (AMPS or TACS). transmit path The transmit path on the TCM8010-50 TCM8010-50 consists of a number of functional blocks, which are described in the following paragraphs. mic inputs Voice signals are input via a pair of microphone preamplifiers, which are stable for gains between 0 dB and 20 dB. All voice-path specifications are given with the preamplifiers configured as unity-gain inverting amplifiers. In standby mode, the bias to the microphone preamplifiers is turned off and the outputs M1O and M2O are in the high-impedance state. MICSW The MICSW block is a 2-input switch that selects either of the preamplifier outputs, and is under control of the digital interface (< MICSEL>). MICTRIM The MICTRIM block provides gain adjustment to compensate for differing microphone sensitivities (< MICT3 ­ MICT0 >). A second-order Sallen-Key low-pass filter is incorporated in this block to provide antialiasing for the TX voice signal. compressor The compressor provides a 1-dB change in output signal level for a 2-dB change in input level over an operating input range of 50 dB. The unity-gain point, Vref, is proportional to the value of VDD (see the compressor table in the transmit path electrical charactistics). Attack time is measured by increasing the input-signal amplitude by a 12-dB step relative to 13 mV rms and is defined as the time required for the output envelope to reach 1.5 times the final steady-state level. Recovery time is measured by reducing the input signal amplitude by a 12-dB step to 13 mV rms and is defined as the time required for the output envelope to settle to 0.75 times the final steady-state level. The attack and recovery times are determined by an internal resistor (RCOMP) and the external capacitor, CCTC, connected between CTC and 0 V, VSS. Attack time = 0.151 × CCTC × RCOMP Recovery time = 0.693 × CCTC × RCOMP TXSW This block is a 3-input switch that selects either the compressor output, compressor bypass (for testing), or the output of the DTMF generator. TXSW is controlled by < TXSW1 ­ TXSW0 >. POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 19 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 PRINCIPLES OF OPERATION TXATTEN The output of TXSW passes through the TXATTEN block, which provides four levels of attenuation. preemphasis The output from TXATTEN is connected to the preemphasis block, which provides the necessary 6 dB per octave increase in gain with frequency by using a second-order filter. Also included in this block is an eighth-order band-pass filter function with a 300-Hz to 3-kHz passband. The nominal gain of this stage is 6 dB at 1 kHz and its output is routed to the POUT terminal. limiter The limiter block limits the maximum output under overload signal conditions, and the limit level is adjustable under control of the serial interface < LIM2 ­ LIM0 >. The limiter range is designed to allow the TX path distortion and maximum signal output specifications to be achieved at a single limiter-adjustment code. The output of the preemphasis block is ac coupled (via an external capacitor) into the LIMIN terminal to ensure symmetrical limiting. low-pass filter The limiter output is processed by the low-pass filter block, which is a fourth-order low-pass filter plus second-order equalizer, to remove excessive harmonics produced by the limiting process. TXSUM This block can sum together or mute any of its three inputs (SAT, data, and voice) under the control of the < TXSAT, TXDAT, TXVOX > bits, respectively. TXTRIM The TXTRIM gain-adjust block can be used to compensate for different modulator sensitivities using bits < TXT4 ­ TXT0 >. A continuous-time output low-pass smoothing filter is included with a typical cutoff frequency of 30 kHz. TX data filter Transmit data is input to terminal TXDA and is routed to the TX data filter block where the data is first conditioned by a second-order antialiasing filter before going on to the transmit data filter. In the AMPS and TACS modes, the transmit data is a Manchester-encoded digital signal at 10k bit/s for AMPS or 8k bits/s for TACS. The transmit data filter for these two modes is a fourth-order Butterworth low-pass filter, with its ­ 3-dB point switchable between AMPS and TACS modes. The filtered AMPS or TACS wideband-data signal is summed into the transmit signal path in the TXSUM block. TXSAT filter path ­ TXSA to TXO The input to the transmit SAT signal path is determined by the SATSW block, which selects between the TXSA terminal and the output of the receive SAT filter (RXSAT). The signal is processed by the TXSAT filter block, which includes an antialiasing filter, a fourth-order narrow-band band-pass filter centered at 6 kHz, and a gain adjust stage < SAT3 ­ SAT0 >. The output of this block is then applied to an input of TXSUM to be summed into the voice path when selected. 20 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 PRINCIPLES OF OPERATION receive path ­ voice The demodulated signal from the receiver is input to the TCM8010-50 TCM8010-50 at the RXIN terminal. A pair of loudspeaker drivers are provided, producing output signals on terminals SP1 and SP2, and are capable of driving 500- loads. RXTRIM A gain-adjust block, RXTRIM, is provided to allow variations in the receiver FM demodulator/discriminator characteristics to be accommodated < RXT3 ­ RXT0 >. This block is enabled in both active and standby modes. A second-order continuous-time filter with a typical cutoff frequency of 30 kHz provides an antialiasing function for the receive signal path. deemphasis The deemphasis filter block exhibits a 6-dB/octave decrease in gain versus frequency characteristic. It also includes an eighth-order band-pass filter (pass band = 300 Hz to 3 kHz) to separate the received voice signal from the data and SAT signals. A continuous-time smoothing filter is incorporated at the output, and the output signal appears at terminal RXO. expander The expander block provides a 2-dB change in output signal level for a 1-dB change in input level over an operating input range of 33 dB. The unity-gain level, Vref, is proportional to VDD (see the expander table in the receiver path electrical charactistics). Attack time is measured by increasing the input signal amplitude by a 6-dB step relative to 72.5 mV and is defined as the time required for the output envelope to reach 0.57 times the final steady-state level. Recovery time is measured by reducing the input signal amplitude by a 6-dB step to 72.5 mV and is defined as the time required for the output envelope to settle to 1.5 times the final steady-state level. The attack and recovery times are determined by an internal resistor, REXP , and the external capacitor, CEXP , connected to ETC and 0 V, VSS. Attack time = 0.173 × CETC × REXP Recovery time = 0.693 × CETC × REXP RXSW RXSW is a 4-input switch block that provides a selection between the call-tone input terminal (CTI), the expander output (externally capacitively coupled to terminal RXVI), the expander-bypass path (for testing), and the output from the DTMF generator as the input to the volume-control block. The control bits are < RXSW1 and RXSW0 >. To simplify the connection of a digital signal for a User Alert tone (typically between 200 Hz and 400 Hz), no internal bias is provided for the CTI input. If an ac-coupled signal is applied to CTI, an external bias resistor (typical value is 100 k) is required and should be connected between CTI and VMID. volume control This block provides output level adjustment to implement a user-adjustable level control via control bits < VOL3 ­ VOL0 >. LSSW The loudspeaker control switch block (LSSW) allows selection between either SP1 or SP2 outputs, muting, or differential drive of both terminals via control bits < LS1 ­ LS0 >. POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 21 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 PRINCIPLES OF OPERATION receive path ­ data/SAT The demodulated signal from the receiver is input to the TCM8010-50 TCM8010-50 at the RXIN terminal. This signal, containing voice, data, and SAT components, is processed and antialias filtered by the RXTRIM block. receive data path ­ data comparator The signal from RXTRIM is applied to the data comparator block, which has defined threshold levels. The data signal is Manchester encoded at 10 kbit/s for AMPS mode and at 8 kbit/s for TACS mode. Detected data appears at RXDO. This signal path is enabled in the standby mode. receive SAT path ­ RX SAT filter The RX SAT filter block uses a fourth-order Butterworth bandpass filter centered at 6 kHz to separate received SAT signals from the voice signal. The output of the bandpass filter is routed to an input of the SATSW block and to the SAT comparator block. receive SAT path ­ SATSW SATSW is a 2-input switch block that selects between the output of the RX SAT filter and an external SAT source (applied to terminal TXSA) via control bit < ISAT >. receive SAT path ­ SAT comparator The SAT comparator block recovers the SAT signal and has defined hysteresis levels for improved noise immunity. The output is routed to terminal RXSO. An internal switch, controlled by bit < SATDIG>, bypasses the SAT comparator, applying the output from the RX SAT filter block directly to terminal RXSO. digital interface The TCM8010-50 TCM8010-50 is controlled by a 3-wire digital interface, consisting of a clock signal (DCLK), a chip select (CS), and a bidirectional data line (DATA). The logic signal present on DATA is written into the device on the rising edge of DCLK when CS is low. Serial messages to and from the device contain a read/write bit, an address field, and a data word. Results from the ADC are read back using the serial interface, and the DCLK signal is used to drive the converter. Test access to analog and digital sections of the device are provided using the serial interface. write operations A timing diagram for a write operation to the device is shown in Figure 14. In this case, the read/write bit is set to 1, followed by a 3-bit address word, (A2 ­ A0), and a 10-bit data word (D9 ­ D0). Data shifts into the device on the rising edge of DCLK and is transferred to internal registers on the falling edge of the fourteenth clock pulse after CS goes low. If CS returns high before this time, no transfer takes place and the input interface is reset. CS DCLK DATA X A2 A1 A0 D9 D8 D7 D6 D5 D4 Figure 14. Write-Operation Timing 22 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 D3 D2 D1 D0 X TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 PRINCIPLES OF OPERATION control words Table 1 shows control-word and configuration assignments for the device. Table 2 shows control-word descriptions, Table 3 shows test modes, and Table 4 details DTMF control words. Table 1. Control-Word and Configuration Assignments A2 A1 A0 Word 0 0 0 0 D9 STBY D8 MD1 TXSW0 D7 MD0 TXSAT D6 ISAT D5 SATDIG D4 DACX2 D3 CKSEL Word 1 0 0 1 Word 2 0 1 0 TXDAT TXVOX MICT3 LIM1 MICT2 LIM0 MICT1 SAT3 MICT0 SAT2 TXATT1 TXT4 TXATT0 TXT3 Word 3 0 1 1 Word 4 1 0 0 LIM2 RXT3 RXT1 DTTR2 DAC7 RXT0 DTTR1 DAC6 RXSW1 DTTR0 SAT0 VOL3 0 DACAD1 RXT2 DTTR3 DACAD0 SAT1 RXSW0 Word 5 1 0 1 DTSK Word 6 1 1 0 DAC5 Word 7 1 1 1 - - - - - TXSW1 MICSEL D2 CKRT2 DACON D1 CKRT1 LS1 D0 CKRT0 LS0 TXT2 1 TXT1 0 TXT0 0 0 VOL2 0 DAC4 DAC3 DAC2 VOL1 TEST1 DAC1 VOL0 TEST0 DAC0 - DTMF3 DTMF2 DTMF1 DTMF0 Table 2. Control-Word Descriptions DESCRIPTION Word 0 STBY = Standby select: 0 = Standby, 1 = Active MD1 ­ MD0 = Mode select: 00 = AMPS, 01 = Undefined, 10 = TACS, 11 = Undefined ISAT = SAT select: 0 = External, 1 = Internal SATDIG = Digital/Analog RX SAT: 0 = Digital, 1 = Analog DACX2 = DAC range select: 0 = 0 ­ VDD/2, 1 = 0 ­ VDD CKSEL = Clock source select: 0 = Oscillator, 1 = Sinusoidal input CKRT2 ­ CKRT0 = Clock rate select: 000 = 3.58 MHz, 001 = 7.16 MHz, 010 = 10.74 MHz, 011 = 14.32 MHz, 100 = 2.56 MHz, 101 = 10.24 MHz, 110 = 12.80 MHz, 111 = 15.36 MHz Word 1 TXSW1 ­ TXSW0 = TX Voice select: 00 = Mute, 01 = Compressor O/P, 10 = Compressor bypass, 11 = DTMF TXSAT = TX SAT enable: 0 = Mute, 1 = Enable TXDAT = TX Wideband data enable: 0 = Mute, 1 = Enable TXVOX = TX Voice enable: 0 = Mute, 1 = Enable TXATT1 ­ TXATT0 = TX attenuation: 00 = 0 dB, 01 = 8 dB, 10 = dB, 11 = 24 dB DACON = DACS on select in standby: 0 = Off, 1 = On LS1 ­ LS0 = Loudspeaker configuration: 00 = Mute, 01 = SP2 enable, 10 = SP1 enable, 11 = Differential Word 2 MICSEL = Microphone select: 0 = M1, 1 = M2 MICT3 ­ MICT0 = Microphone trim: 0000 = minimum gain, 1111 = maximum gain TXT4 ­ TXT0 = TX Deviation trim: 00000 = minimum gain, 11111 = maximum gain LIM2 ­ LIM0 = Deviation limiter adjust: 000 = minimum deviation, 111 = maximum deviation SAT3 ­ SAT0 = TXSAT adjust: 0000 = minimum, 1111 = maximum D0 ­ D1 = 0, D2 = 1 RXT3 ­ RXT0 = RX input adjust: 0000 = minimum, 1111 = maximum RXSW1 ­ RXSW0 = RX switch control: 00 = CT input, 01 = Expander O/P, 10 = Expander bypass, 11 = DTMF VOL3 ­ VOL0 = RX path audio volume control: 0000 = minimum, 1111 = maximum Word 3 Word 4 Word 5 DTSK = DTMF Skew enable: 0 = disabled, 1 = enabled DTTR3 ­ DTTR0 = DTMF adjust: 0000 = minimum, 1111 = maximum TEST1 ­ TEST0 = Test mode: (see Table 3) D2 ­ D4 = 0 Word 6 DACAD1 ­ DACAD0 = DAC address: 00 = DAC 1, 01 = DAC 2, 10 = DAC 3, 11 = all DACs Word 7 DTMF3 ­ DTMF0 = DTMF control: (see Table 4) POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 23 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 PRINCIPLES OF OPERATION Table 3. Test Modes (to Word 5) SATDIG X TEST1 0 TEST0 0 Normal MODE OUTPUT AT RXDO OUTPUT AT RXSO 0 0 1 Digital Test Digital DTMF High Tone Digital DTMF Low Tone 1 1 1 1 0 Analog Test A Rx Data (analog) Limiter Output (dc) 1 Analog Test B Bandgap Output 0 Tx Data (analog) 1 0 Other States Rx Data (digital) Rx SAT (digital) 0 1 1 Other States Digital DTMF High Tone Digital DTMF Low Tone 1 0 1 Other States Digital DTMF High Tone RXSAT (analog) Table 4. DTMF Control (to Word 7) DTMF3 0 DTMF1 0 DTMF0 0 KEY LOW TONE Hz HIGH TONE Hz 1 697 1209 0 0 0 1 4 770 1209 0 0 1 0 7 852 1209 0 0 1 1 * 941 1209 0 1 0 0 2 697 1336 0 1 0 1 5 770 1336 0 1 1 0 8 852 1336 0 1 1 1 0 941 1336 1 0 0 0 3 697 1477 1 0 0 1 6 770 1477 1 0 1 0 9 852 1477 1 0 1 1 # 941 1477 1 1 0 0 - 697 Off 1 1 0 1 - Off 1209 1 1 1 0 - Off 1477 1 24 DTMF2 0 1 1 1 - Off Off POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 PRINCIPLES OF OPERATION read operations A timing diagram of a read operation, which outputs ADC results from the device, is shown in Figure 15. The first bit driven into the device is a logic 0, followed by a 3-bit address word. The device then assumes control of the DATA line on the falling edge of the fifth clock pulse after CS goes low. The conversion result is output MSB first, with the MSB being output on the falling edge of the seventh clock pulse after CS goes low. Control of the DATA line is released (returned to input mode), when CS goes high. CS DCLK DATA IN X A2 A1 A0 MSB DATA OUT D7 LSB D6 D5 D4 D3 D2 D1 D0 ADC Sample Figure 15. Read-Operation Timing Table 5 details the decoding of the three address bits. Table 5. Address Bit Decoding A2 A1 A0 REFERENCE MEASUREMENT 0 0 0 Band gap 0 0 1 Band gap VMID ADC1 0 1 0 Band gap ADC2 additional functions The following paragraphs detail some additional functions of the TCM8010-50 TCM8010-50. digital-to-analog converters Three 8-bit, voltage-output DACs are provided, with outputs on terminals DAC1, DAC2, and DAC3. The output range of each converter is from 0 V to VDD/2 or 0 V to VDD with an LSB step size of VDD/256 VDD/256 or VDD/2 × 1/256 as selected by < DACX2>. All DAC outputs can either go to 0 V in standby mode or be active on depending on the state of control bit < DACON>. For correct operation of all of the TCM8010-50 TCM8010-50, < DACON > must be set to 0 in active mode. Previously written values are restored to the DAC outputs on entry to active mode. < DACAD1 ­ DACAD0 > selects which DAC is being addressed, and < DAC7 ­ DAC0 > sets the output voltage. POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 25 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 PRINCIPLES OF OPERATION analog-to-digital converter The TCM8010-50 TCM8010-50 contains an 8-bit ADC with a 3-channel analog-input multiplexer. This allows conversion of signals on ADC1, ADC2, and VMID. An internal band gap voltage reference multiplied by two is used when measuring ADC1, ADC2, and VMID. Fifteen periods of DCLK are required to complete a conversion. DTMF generator The DTMF generator produces the seven standard tones with a frequency accuracy of ± 1%. The desired DTMF signal is selected by < DTMF3 ­ DTMF0 >. A switchable preemphasis or skew between the low and high tone groups is provided for TACS operation and is selected by bit < DTSK>. DTMF signal levels scale directly with supply voltage. A 4-bit trim is provided to allow adjustment of DTMF amplitude to meet system specifications and allow flexibility for user-generated call-tone type signals (< DTTR3 ­ DTTR0 >). When DTMF is selected in the transmit or receive paths, typical voice signals are attenuated by 50 dB. clock and supply Power supply and clock considerations are covered in the following paragraphs. supply voltage Specifications are given for a supply voltage of 5 V. Signal levels such as SAT, DATA, and DTMF are derived from this. Other parameters such as the compressor and expander unity-gain levels are also dependent on the supply voltage. supply current The TCM8010-50 TCM8010-50 has two basic operating modes: standby and active. In the standby mode, only the receive data path is enabled and current consumption is less than 2 mA. There is also the option of keeping the DACs powered up in the standby mode, depending on the setting of < DACON>. In the active mode, all functional blocks are powered up and the current consumption is less than 12 mA. crystal oscillator and clock interface The clock signal for the device can be generated by the internal oscillator block using an external crystal connected to the XT0 and XT1 terminals. Or, an external 0.5-V (minimum) peak sinusoidal clock signal can be applied to XT1. The external clock signal or the crystal can be one of eight frequencies, selected by control bits < CKRT2 ­ CKRT0 >. Crystal or external clock operation is selected by < CKSEL>. 26 POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 TCM8010-50 TCM8010-50 AMPS/TACS AUDIO PROCESSOR SLWS009A SLWS009A ­ SEPTEMBER 1994 ­ REVISED DECEMBER 1995 FR (S-PDFP-G44 S-PDFP-G44) PLASTIC QUAD FLATPACK 0,40 0,20 0,80 33 0,16 M 23 34 22 44 12 1 0,15 NOM 11 8,00 TYP 10,20 SQ 9,80 12,80 SQ 12,00 Gage Plane 0,25 0,10 MIN 0°­ 10° 0,88 0,48 1,75 TYP Seating Plane 0,10 2,25 MAX 4040159 / B 10/94 NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. POST OFFICE BOX 655303 · DALLAS, TEXAS 75265 27 IMPORTANT NOTICE Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. TI warrants performance of its semiconductor products and related software to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage ("Critical Applications"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. Inclusion of TI products in such applications is understood to be fully at the risk of the customer. Use of TI products in such applications requires the written approval of an appropriate TI officer. 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