GM0936TQ Voice-Band Audio CODEC CDMA Single operation power
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GM0936TQ
GM0936TQ
Voice-Band Audio CODEC CDMA
Single operation power consumption Operating mode 20mW Power-down mode Combined A/D, D/A, Filters Electret microphone bias reference voltage available Compatible with digital signal processors (DSPs) Programmable volume control Passband with Specified Master clock LQFP (TOP VIEW)
MICBIAS EXTMIC EARGS EARB MICGS MICIN EARA MICSEL
Designed standard 2.048MHz master clock U.S. Analog, U.S. Digital, CT2, DECT, GSM, Standards Hand-held Battery-Powered Telephones On-chip voltage references Package Type LQFP, DIP,
DIP/SOP (TOP VIEW)
EARA EARB EARGS MICMUTE EARMUTE MICBIAS MICGS MICIN VMID DOUT AVcc DVcc MICMUTE
VMID AGND DGND
EARMUTE
DOUT
GM0936TQ
Description
GM0936TQ contains conversion functions integrated single chip, utilizes sigma-delta modulation technique achieve high resolution data conversion power consumption. GM0936TQ ideal analog front device high performance voice-band communication systems. Cellular telephone systems targeted particular; however, these integrated circuits function other systems including digital audio, telecommunications, data acquisition. transmit section designed interface directly with electret microphone element. microphone input signals, MICIN EXTMIC, selected MICSEL. MICSEL floated Low, then MICIN selected, MICSEL high, then EXTMIC selected. microphone input signal (MICIN EXTMIC) buffered, first-order low-pass filtered, amplified with provision setting amplifier gain accommodate range signal input levels. amplified signal 1bitmodulated second-order sigma-delta modulator. modulated signal then applied input high-performance FIR-type digital decimation filters with frequency response equalization. resulting data then clocked DOUT serial data stream. receive section takes frame sereal data converts analog through highperformance FIR-type digital interpolation filter together with frequency response equalization, second-order digital sigma-delta modulator, analog reconstruction filters. On-chip voltage reference ensures highly integrated solution internal voltage references generated. internal reference voltage, VMID, used develop midlevel virtual ground amplifier circuits microphone bias circuit.Another reference voltage, MICBIAS, supply bias current microphone. Serial interfaces transmit receive paths support directly industry standard processors. GM0936TQ devices characterized operation from
GM0936TQ
Block Diagram
AVCC EXTMIC MICIN MICGS EARMUTE MICMUTE VMID MICBIAS EARGS EARA EARB AGND DVCC DGND
ANALOG -MODULATOR
SINC 3FILTER
FIRFILTER
DOUT
VOLTAGE REFERENCE POST FILTER 1-BIT
INTERFACE
FIRDIGITAL SINC 2MODULATOR FILTER FILTER
MICSEL
Analog order Modulator Block Diagram
Integrator1
Integrator2
Quantizer
Digital order Modulator Block Diagram
Quantizer
Delay2
Delay1
GM0936TQ
Description
ANALOG SIGNALS
TERMINAL NAME AGND AVcc EARA EARB EARGS EARMUTE_ MICBIAS MICGS MICIN MICMUTE_
LQFP
SOP&DIP
DESCRIPTION Analog Ground Analog Power (3V)
Earphone output Side-tone output Side-tone input Earphone output mute control signal Microphone bias Output internal microphone amplifier Microphone input Microphone input mute Bias voltage reference. pair external, lowleakage, high-frequency capacitors should connected between VMID ground filtering Hand-free MIC-IN MIC-IN selection input. When float low, MICSEL selects MICIN. When high, MICSEL selects EXTMIC.
VMID
ETMIC
MICSEL
GM0936TQ
Description
DIGITAL SIGNALS
TERMINAL NAME DGND DOUT DVcc PDN_
LQFP 1,2,3, 5,6,7, 8,10, 12,13, 14,18, 22,23, 24,25, 26,28, 29,30, 31,32, 33,35
SOP&DIP
DESCRIPTION Clock input (2.048 MHz) Digital ground
Receive data input Transmit data output Digital power
Frame-synchronization clock input receive channel Frame-synchronization clock input receive channel Power-down input, Active
internal connection
GM0936TQ
Electrical Characteristics Absolute Maximum Ratings over operating free-air temperature range
PARAMETER Supply Voltage Range Digital Input Voltage Range Analog Input Voltage Range SYMBOL DVCC, AVCC Vind Vina UNIT
Recommended Operating Conditions
PARAMETER Supply Voltage High-level Input Voltage Low-level Input Voltage Operating free-air Temperature SYMBOL DVCC, AVCC UNIT
Power Supply Characteristics, fCLK 2.048 MHz, outputs loaded, Vcc=3V,
PARAMETER Power Dissipation Operating Power Dissipation Power down UNIT
Digital Characteristics DVCC AVCC
PARAMETER Input Capacitance Input Leakage Current Low-level output Voltage (IOL 3.2mA) High-level output Voltage (IOH -3.2mA) UNIT
GM0936TQ
Microphone interface
PARAMETER Input offset voltage MICIN Input bias current MICIN 10000 TEST CONDITIONS UNIT
+200
Unity-gain bandwidth, open loop MICIN Large-signal voltage amplification MICGS Iomax Maximum output current VMID MICBIAS(source only)
Speaker interface
PARAMETER VO(PP) output voltage IOmax Maximum output current Output resistance EARA, EARB Gain change EARMUTE low, level when muted TEST CONDITIONS UNIT
GM0936TQ
Analog Characteristics DVCC AVCC KHz) Converter
PARAMETER Oversampling Ratio Resolution Dynamic Range S/(N+THD) Output Sample Rate Maximum output current MICBIAS Maximum output voltage Microphone Amplifier 0.85 0.95 UNIT
Transmit filter transfer over recommended ranges supply voltage free-air temperature, CLK=2.048 MHz, FSX=8
PARAMETER TEST CONDITIONS fMICIN fMICIN fMICIN Gain relative input signal 1.02 Input amplifier unity gain, output 400mVpp signal MICGS fMICIN fMICIN fMICIN fMICIN fMICIN UNIT 0.76 0.73 0.67 -1.9 -4.5 -5.4 -8.9
GM0936TQ
Transmit idle channel noise distortion, linear mode selected, over recommended ranges supply voltage free-air temperature (see Notes
PARAMETER Transmit noise TEST CONDITIONS MICIN connected MICGS through resistor MICIN DOUT dBm0 Gain relative input signal 1.02 MICIN DOUT dBm0 MICIN DOUT dBm0 MICIN DOUT dBm0 MICIN DOUT dBm0 UNIT 52.3 51.9 50.7 49.0 µVrms
Notes: input amplifier inverting unity gain. Transmit noise, linear mode: µVrms equivalent (referenced device level).
Converter
PARAMETER Oversampling Ratio Resolution Dynamic Range S/(N+THD) Maximum output current Output Voltage Range 0.81 0.91 UNIT
Receive distortion, linear mode selected, over recommended ranges supply voltage free-air temperature
PARAMETER TEST CONDITIONS EARA dBm0 Receive signal-to -distortion ratio with sine-wave input EARA dBm0 EARA dBm0 EARA dBm0 EARA dBm0 UNIT 59.7 59.6 56.1 55.3
GM0936TQ
Power supply rejection over recommended ranges supply voltage operating free-air temperature
PARAMETER Supply voltage rejection, transmit channel Supply voltage rejection, receive channel TEST CONDITIONS Idle channel, supply signal 100mVrms (measured DOUT) Idle channel, supply signal 100mVrms (measured EARA) UNIT
GM0936TQ
Timing DVCC AVCC
PARAMETER Frequency Sampling Rate DOUT Delay from Delay from 2.048 UNIT
Clock timing requirements
Duty cycle, UNIT
Transmit timing requirements
tsu(FSX) th(FSX) Setup time, high before Hold time, high after UNIT
Receive timing requirements
tsu(FSR) th(FSR) tsu(DIN) th(DIN) Setup time, high before Hold time, high after Setup time, high before Hold time, high after UNIT
GM0936TQ
Timing Diagram
Receive Time Slot
th(FSR)
Note Note
tsu(FSR)
th(DIN)
tsu(DIN)
Note NOTES: This window allowed high. This window allowed low. Transitions measured 50%.
Figure1. Receive Side Timing Diagram
Transmit Time Slot
th(FSX)
tsu(FSX)
Note
DOUT
tpd1
Note tpd2
tpd3
Note
NOTES: This window allowed high. This window allowed low. Transitions measured 50%.
Figure2. Transmit Side Timing Diagram
GM0936TQ
PRINCIPLES OPERATION power-down operation minimize power consumption, power-down mode provided. power down, external signal applied PDN. absence signal, internally pulled high logic level device remains active. power-down mode, average power consumption reduced 1mW. Timing inputs that sampling frequency. Data transmitted DOUT positive transitions following rising edge FSX. Data received falling edges following FSR.
Table Power-On Power-Down Procedures DEVICE STATUS PROCEDURE =high, pulses, pulses =low, FSX,FSR TYPICAL POWER CONSUMPTION DIGITAL OUTPUT STATUS
Power
Digital outputs active
Power down dont care
DOUT high-impedance state
GM0936TQ
PRINCIPLES OPERATION
transmit operation
microphone input microphone input amplifier designed specifically interface electret-type microphone elements, shown Figure VMID buffer circuit provides voltage (MICBIAS) bias voltage electret microphone. microphone amplifier output (MICGS) used conjunction with feedback network applied amplifier inverting input (MICIN) amplifier gain. VMID appears terminal provide place filter VMID voltage.
VMID
VMID Reference Amplifiers
MICBIAS
Reference Voltage Generator
MICGS
100nF
Microphone Amplifier 2nd-order Modulator
MICIN
Electret Microphone
GM0936TQ
NOTE Terminal numbers shown LQFP package.
Figure Typical Microphone Interface microphone mute function MICMUTE input causes digital circuitry transmit zero code DOUT. transmit filter low-pass antialiasing section implemented connecting RC-pair externally between MICGS MICIN. RC-pair, together with microphone amplifier, provides single-pole pass filter. antialiased signal 1bit-modulated second-order sigma-delta modulator. modulated signal then applied input high-performance FIR-type digital decimation filters with frequency response equalization.
GM0936TQ
PRINCIPLES OPERATION encoding encoder performs conversion 2nd-order Sigma-Delta modulator using switched-capacitor technology high-performance FIR-type digital decimation filters with frequency response equalization. resulting data then clocked DOUT serial data. data word structure data word bits long. first bits comprises audio data sample, last three bits form volume control word receive direction (DIN) zero bits transmit direction (DOUT). sign transmitted first.
receive operation
decoding serial data word received first clock cycles. receive section converts frame sereal data analog through high-performance FIR-type digital interpolation filter together with frequency response equalization, second-order digital sigma-delta modulator, analog reconstruction filters. receive buffer receive buffer contains volume control. earphone amplifier output used drive single-ended load with output signal voltage centered around VMID. EARA Figure output decoded analog signal. EARB figure used sidetone signal output which used internally. resistor-capacitor pair attached EARB embedded reduce number on-board components. next section more information sidetone generation.
GM0936TQ
PRINCIPLES OPERATION
EARA
VMID
VMID
EARB
EARGS
GM0936TQ
NOTE Terminal numbers shown LQFP package.
Figure Earphone Audio-Output Amplifier Configuration receive data format decoding operation, bits data received. first bits code, remaining three bits from volume control word(see Table volume control function actually attenuation control which first received most significant. maximum volume occurs when three volume control bits zero. Eight levels attenuation selectable 3-dB steps, giving maximum attenuation when bits volume control latched into GM0936TQ must present each received data word.
GM0936TQ
Table Receive-Data Definitions Data
(sign bit)
Data Time Volume Control
Where: D12-D0 Data word Volume (attenuation control) maximum volume, minimum volume,
GM0936TQ
APPLICATION INFORMATION
output gain sidetone considerations single-ended outputs EARA EARB capable driving output power level into load impedance separately.The sidetone signal received signal summed configuring external components like Figure amount sidetone mixing controlled resistor connected between EARB EARGS. resistance become greater, amount sidetone mixing increases.
EARA
speaker driving amp.
EARB
GM0936TQ
EARGS
MICGS
100nF
MICIN
Electret Microphone NOTE Terminal numbers shown TQFP package.
Figure Configuration Gain-Setting Sidetone higher clock frequencies sample rates GM0936TQ designed work with sample rates 16kHz where frequency frame sync determines sampling frequency. However, there fundamental requirement maintain ratio master clock frequency, fCLK, frame sync frequency, fFSR/ fFSX. This ratio GM0936TQ 2.048 MHz/8 kHz, master clocks frame sync. example, operate GM0936TQ sampling rate fFSR fFSX equal kHz, fCLK must times kHz, 4.096 MHz. GM0936TQ operated above 8-kHz sample rate, however, expected that performance becomes somewhat degraded. Exact parameter specifications rates 16-kHz sample rate specified this time.
GM0936TQ
GM0936TQ
GM0936TQ
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