Am79R241 Am79Q2243 PL032 Am79X22xx P1001SC TISP61089 - Datasheet Archive

 

ADVANCE INFORMATION Am79R241 Intelligent Subscriber Line Interface Circuit (ISLICTM) DISTINCTIVE CHARACTERISTICS s Monitor of

 

Intelligent AccessTM Voice Solutions ADVANCE INFORMATION Am79R241 Am79R241 Intelligent Subscriber Line Interface Circuit (ISLICTM) DISTINCTIVE CHARACTERISTICS s Monitor of two-wire interface voltages and currents supports s Supports internal and external ringing s +5 V and battery supplies - Voice transmission s Dual battery operation for system power saving - Through chip ring generation - Automatic battery switching - Programmable DC feed characteristics - Intelligent thermal management - Independent of battery s Compatible with inexpensive protection networks - Current limited - Selectable off-hook and ground-key thresholds - Accommodates low tolerance fuse resistors or PTC thermistors - Subscriber line diagnostics s Metering capable - Leakage resistance - Loop resistance - 12 kHz and 16 kHz - Line capacitance - Smooth polarity reversal - Bell capacitance s Tip-open state supports ground start signaling - Power cross and fault detection s Integrated test load switches/relay drivers - Foreign voltage sensing BLOCK DIAGRAM Signal Transmission AD SA HPA HPB Two-Wire Interface Longitudinal Control Gain/Level Shift RSN VTX VLB SB BD Attenuator VSAB VREF TMN TMP TMS Signal Conditioning Thermal Management Control IMT ILG Fault Meas VBL Switch Driver VBH Relay Control R2 R3 RYE Relay Drivers P1 Input Decoder and Control Registers P2 P3 LD R1 Relay Driver 1 BGND CREF GND This document contains information on a product under development at Advanced Micro Devices. The information is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed product without notice. VCC Pub. # 22420 Rev: A Amendment: /0 Issue Date: September 1998 A D V A N C E I N F O R M A T I O N TABLE OF CONTENTS Distinctive Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Distinctive Characteristics of Intelligent Access Voice Chipsets . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Intelligent Access Voice Solutions Linecard using Am79R241 Am79R241 . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Linecard Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2 Am79R241 Am79R241 A D V A N C E I N F O R M A T I O N The Am79R241 Am79R241, in combination with an ISLACTM device, implements the telephone line interface function. This enables the design of a low cost, high performance, fully software programmable line interface for multiple country applications worldwide. All AC, DC, and signaling parameters are fully programmable via microprocessor or GCI interfaces on the ISLAC device. Additionally, the Am79R241 Am79R241 device has integrated self-test and line-test capabilities to resolve faults to the line or line circuit. The integrated test capability is crucial for remote applications where dedicated test hardware is not cost effective. DISTINCTIVE CHARACTERISTICS OF THE INTELLIGENT ACCESS VOICE CHIPSET s Performs all battery feed, ringing, signaling, hybrid and test (BORSCHT) functions s Exceeds LSSGR and CCITT central office requirements s Two chip solution supports high density, multichannel architecture s Selectable PCM or GCI interface s Single hardware design meets multiple country requirements through software programming of: - Supports most available master clock frequencies from 512 kHz to 8.192 MHz s On-hook transmission - Ringing waveform and frequency s Power/service denial mode - DC loop-feed characteristics and current-limit s Line-feed characteristics independent of battery voltage - Loop-supervision detection thresholds - Off-hook debounce circuit s Only 5 V, 3.3 V and battery supplies needed - Ground-key and ring-trip filters s Low idle-power per line - Off-hook detect de-bounce interval s Linear power-feed with intelligent powermanagement feature - Two-wire AC impedance - Trans-hybrid balance s Compatible with inexpensive protection networks; Accommodates low-tolerance fuse resistors while maintaining longitudinal balance - Transmit and receive gains - Equalization s Monitors two-wire interface voltages and currents for subscriber line diagnostics - Digital I/O pins - A/µ-law and linear selection s Built-in voice-path test modes s Supports internal and external ringing - Self-contained ringing generation and control s Power-cross, fault, and foreign voltage detection s Integrated line-test features - Supports external ringing generator and ring relay - Leakage - Ring relay operation synchronized to zero crossings of ringing voltage and current - Line and ringer capacitance - Loop resistance - Integrated ring-trip filter and software enabled manual or automatic ring-trip mode s Supports metering generation with envelope shaping s Integrated self-test features - Echo gain, distortion, and noise s 0 to 70°C commercial operation - ­40°C to 85°C extended temperature range available s Smooth or abrupt polarity reversal s Adaptive transhybrid balance - Continuous or adapt and freeze s Supports both loop-start and ground-start signaling s Small physical size s Up to three relay drivers per ISLIC device - Configurable as test load switches Am79R241 Am79R241 3 A D V A N C E I N F O R M A T I O N BLOCK DIAGRAMS Figure 1. Example Four-Channel Linecard Block Diagram 4 7 A1 Am79R241 Am79R241 VCCD LD1 B1 DGND1 VREF A2 B2 A3 DGND2 7 RC Networks and Protection VCCA Am79R241 Am79R241 LD2 4 AGND1 AGND2 IO1-IO4 TSCA/G 7 LD3 Am79R241 Am79R241 B3 3 A4 TSCB P1-P3 DRA/DD 7 Am79R241 Am79R241 LD4 B4 RREF Quad ISLAC Am79Q2243 Am79Q2243 DRB DXB DXA/DU DCLK/S0 PCLK/FS RSHB BATH MCLK FS/DCL RSLB BATL CS/RST DIO/S1 INT 4 Am79R241 Am79R241 A D V A N C E Figure 2. I N F O R M A T I O N Am79R241 Am79R241 Block Diagram IA sense AD IA IA 600 RSN + + - SA + - Fault Meas. + HPA - + TMS VTX VREF BGND + HPB Fault Meas. + + = 0.01 - SB VSAB VREF IB IB sense BD IB 600 TMN TMP VREF + + - VREF Thermal Management Control Gain/Level Shift VLB To Power Amplifiers VBH High Neg Batt Sel IA IB - 600 600 ILG Fault Meas. Disconnect Active Normal Integral Ringing Standby Active Fixed Longitudinal RYE Reserved Active High Battery R3 IMT Tip Open IA IB + 600 600 VBL Decoder R2 CREF RD1 RD2 R1 RD3 C1 C2 Control Register C3 Demux Power amplifiers positive supply BGND P1 P2 P3 Am79R241 Am79R241 LD VCC GND 5 A D V A N C E I N F O R M A T I O N ORDERING INFORMATION AMD standard products are available in several packages and operating ranges. The ordering number (valid combination) is formed by a combination of the elements below. An ISLAC device must be used with this part. Am79R241 Am79R241 J C TEMPERATURE RANGE C= Commercial (0°C to +70°C)* PACKAGE TYPE J = 32-pin plastic leaded chip carrier (PL032 PL032) DEVICE NAME/DESCRIPTION Am79R241 Am79R241 Intelligent Subscriber Line Interface Circuit Valid Combinations Valid Combinations Am79R241 Am79R241 Valid combinations list configurations planned to be supported in volume for this device. Consult the local AMD sales office to confirm availability of specific valid combinations, and to check on newly released valid combinations. JC Note: *Functionality of the device from 0°C to 70°C is guaranteed by production testing. Performance from ­40°C to +85°C is guaranteed by characterization and periodic sampling of production units. 6 Am79R241 Am79R241 A D V A N C E I N F O R M A T I O N AD RSVD 1 32 31 30 BD BGND 4 3 VCC 2 VBH VBL CONNECTION DIAGRAM R1 5 29 SB R2 6 28 SA RYE 7 27 IMT R3 8 26 ILG 25 CREF Am79R241 Am79R241 32-Pin PLCC TMS 9 TMP 10 24 RSVD TMN 11 23 HPB P1 12 22 HPA P2 13 21 VTX Am79R241 Am79R241 VREF RSN VLB GND VSAB LD P3 14 15 16 17 18 19 20 7 A D V A N C E I N F O R M A T I O N PIN DESCRIPTIONS Pin Pin Name AD, BD A, B Line Drivers BGND I/O Ground O Description Provide the currents to the A and B leads of the subscriber loop. Ground return for high and low battery supplies. CREF +3.3 VDC VCCD reference from the ISLAC device used for current pin compliance limiting. GND Ground Analog and digital ground return for VCC. HPA, HPB High-Pass Filter Capacitor O These pins connect to CHP, the external high-pass filter capacitor that separates the DC loop-voltage from the voice transmission path. ILG Longitudinal Current Sense O ILG is proportional to the common-mode line current (IAD ­ IBD), except in disconnect mode, which is proportional to the current into grounded SB. IMT Metallic Current Sense O IMT is proportional to the differential line current (IAD + IBD), except in disconnect mode, where IMT is proportional to the current into grounded SA.The Am79R241 Am79R241 indicates thermal overload by pulling IMT to +3 V. LD Register Load I The LD pin controls the input latch and responds to a 3-level input. When the LD pin is a logic 1, the logic levels on P1­P3 latch into the Am79R241 Am79R241 control register bits that operate the mode-decoder. When the LD pin is a logic 0, the logic levels on P1­P3 latch into the Am79R241 Am79R241 control register bits that control the relay drivers. When the LD pin level is at ~VREF, the control register contents are locked. P1­P3 Control Bus I Inputs to the latch for the operating-mode decoder and the relay-drivers. R1 Relay 1 Driver O Collector connection for relay 1 driver. Emitter internally connected to BGND. R2 Relay 2 Driver O Collector connection for relay 2 driver. Emitter internally connected to RYE R3 Relay 3 Driver O Collector connection for relay 3 driver. Emitter internally connected to RYE. RSN Receive Summing Node I The metallic current between AD and BD is equal to 500 times the current into this pin. Networks that program receive gain and two-wire impedance connect to this node. This input is at a virtual potential of VREF. RSVD1 Relay 2, 3 Common Emitter O Emitter connection for R2 and R3. Normally connected to relay ground. SA, SB A, B Lead Voltage Sense I Sense the voltages on the line side of the fuse resistors at the A and B leads. External sense resistors, RSA and RSB, protect these pins from lightning or power-cross. TMP, TMN, TMS Thermal Management External resistors connected from TMP to TMS and TMN to VBL to offload excess power from the Am79R241 Am79R241. VBH Battery (Power) Connection to high-battery supply used for ringing and long loops. Connects to the substrate. When only a single battery is available, it connects to both VBH and VBL. VBL Battery (Power) Connection to low-battery supply used for short loops. When only a single battery is available, this pin can be connected to VBH. VCC +5 V Power Supply VLB Longitudinal Voltage I Sets the DC longitudinal voltage of the Am79R241 Am79R241. It is the reference for the longitudinal control loop. When the VLB pin is greater than VREF, the Am79R241 Am79R241 sets the longitudinal voltage. When the VLB pin is driven to levels between 0 V and VREF, the longitudinal voltage is defined by the equations in the longitudinal control section. VREF 1.4 V Analog Reference I The ISLAC chip provides this voltage which is used by the Am79R241 Am79R241 for internal reference purposes. All analog input and output signals interfacing to the ISLAC chip are referenced to this pin. VSAB DC Loop Voltage O Scaled-down version of the voltage between SA and SB on this pin. VTX 8 Reserved RYE This is used during AMD testing. In the application, this pin must be left floating. 4-Wire Transmit Signal O The voltage between this pin and VREF is a scaled down version of the AC component of the voltage sensed between the SA and SB pins. One end of the two-wire input impedance programming network connects to VTX. The voltage at VTX swings positive and negative with respect to VREF. Positive supply for low voltage analog and digital circuits in the Am79R241 Am79R241. Am79R241 Am79R241 A D V A N C E I N F O R M A T I O N GENERAL DESCRIPTION The Intelligent Access voice chipsets integrate all functions of the subscriber line. Two chip types are used to implement the linecard; an Am79R241 Am79R241 device and an ISLAC device. These provide the following basic functions: 1. The Am79R241 Am79R241: A high voltage, bipolar device that drives the subscriber line, maintains longitudinal balance and senses line conditions. 2. The ISLAC device: A low voltage CMOS IC that provides conversion, control and DSP functions for the Am79R241 Am79R241. Complete schematics of linecards using the Intelligent Access voice chipsets for internal and external ringing are shown in Figure 3 and Figure 4. The Am79R241 Am79R241 uses reliable, bipolar technology to provide the power necessary to drive a wide variety of subscriber lines. It can be programmed by the ISLAC device to operate in eight different modes that control power consumption and signaling. This enables it to have full control over the subscriber loop. The Am79R241 Am79R241 is designed to be used exclusively with the ISLAC devices. The Am79R241 Am79R241 requires only +5 V power and the battery supplies for its operation. The Am79R241 Am79R241 implements a linear loop-current feeding method with the enhancement of intelligent Thermal Management. This limits the amount of power dissipated on the Am79R241 Am79R241 chip by dissipating power in external resistors in a controlled manner. Each ISLAC device contains high-performance circuits that provide A/D and D/A conversion for the voice (codec), DC-feed and supervision signals. The ISLAC device contains a DSP core that handles Signaling, DC-feed, supervision and line diagnostics for all channels. The DSP core selectively interfaces with three types of backplanes: · Standard PCM/MPI · Standard GCI · Modified GCI with a single analog line per GCI channel The Intelligent Access voice chipset provides a complete software configurable solution to the BORSCHT functions as well as complete programmable control over subscriber line DC-feed characteristics, such as current limit and feed resistance. In addition, these chipsets provide system level solutions for the loop supervisory functions and metering. In total, they provide a programmable solution that can satisfy worldwide linecard requirements by software configuration. Software programmed filter coefficients, DC-feed data and supervision data are easily calculated with the WinSLACTM software. This PC software is provided free of charge. It allows the designer to enter a description of system requirements. WinSLAC then computes the necessary coefficients and plots the predicted system results. The Am79R241 Am79R241 interface unit inside the ISLAC device processes information regarding the line voltages, loop currents and battery voltage levels. These inputs allow the ISLAC device to place several key Am79R241 Am79R241 performance parameters under software control. The main functions that can be observed and/or controlled through the ISLAC device backplane interface are: · DC-feed characteristics · Ground-key detection · Off-hook detection · Metering signal · Longitudinal operating point · Subscriber line voltage and currents · Ring-trip detection · Abrupt and smooth battery reversal Am79R241 Am79R241 9 A D V A N C E I N F O R M A T I O N · Subscriber line matching · Ringing generation · Sophisticated line and circuit tests To accomplish these functions, the Am79R241 Am79R241 device collects the following information and feeds it, in analog form, to the ISLAC device: · The metallic and longitudinal loop currents · The AC and DC loop voltage The outputs supplied by the ISLAC device to the Am79R241 Am79R241 device are then: · A voltage that provides control for the following high-level Am79R241 Am79R241 device outputs: -DC loop current -Internal ringing signal -12 or 16 kHz metering signal · A low-level voltage proportional to the voice signal · A voltage that controls longitudinal offset for test purposes The ISLAC device performs the codec and filter functions associated with the four-wire section of the subscriber line circuitry in a digital switch. These functions involve converting an analog voice signal into digital PCM samples and converting digital PCM samples back into an analog signal. During conversion, digital filters are used to band-limit the voice signals. The user-programmable filters set the receive and transmit gain, perform the trans-hybrid balancing function, permit adjustment of the two-wire termination impedance and provide frequency attenuation adjustment (equalization) of the receive and transmit paths. Adaptive trans-hybrid balancing is also included. All programmable digital filter coefficients can be calculated using WinSLAC software. The PCM codes can be either 16-bit linear two's-complement or 8-bit companded A-law or µ-law. The ISLAC device supplies complete mode control of the Am79R241 Am79R241 device using the control bus and tri-level load signal. The Intelligent Access voice chipset provides extensive loop supervision capability including offhook, ring-trip and ground-key detection. Detection thresholds for these functions are programmable. A programmable debounce timer is available that eliminates false detection due to contact bounce. For subscriber line diagnostics, AC and DC line conditions can be monitored using built-in test tools. Measured parameters can be compared to programmed threshold levels to set a pass/fail bit. The user can choose to send the actual PCM measurement data directly to a higher level processor by way of the voice channel. Both longitudinal and metallic resistance and capacitance can be measured, which allows leakage resistance, line capacitance, and telephones to be identified. 10 Am79R241 Am79R241 A D V A N C E I N F O R M A T I O N INTELLIGENT ACCESS VOICE CHIPSETS LINECARD WITH Am79R241 Am79R241 Figure 3. Internal Ringing Linecard Schematic +5V VCC RSAi 3.3V CREF SA RRXi VOUTi RSN DGND RFAi A AD RHLi VHLi RTESTMi U3 AGND D1 RTi CADi VCCA VSABi VSAB CHPi BATH VCC +3.3VDC VCCD HPA CS DTi VTX VINi VLB VLBi IMT VIMTi HPB D2 U4 CSSi B RFBi BD RSBi SB CBDi TMS RMTi U1 Am79R241 Am79R241 U2 ISLAC VREF RMGPi ILG VILGi BACK PLANE TMP RLGi TMN VREF RMGLi DHi BATH VREF VBH VREF DLi BATL VBL LD LDi GND CBATHi CBATLi P1 P1 BATL P2 P3 RSVD SLB RSLB P2 P3 BATH SHB RSHB RYE IREF R2 RREF RTESTLi R3 SPB R1 BGND RSVD * CSS required for > 2.2 VRMS metering * Connections shown for one channel Am79R241 Am79R241 11 A D V A N C E Figure 4. I N F O R M A T I O N External Ringing Linecard Schematic +5 V VCC SA RSAi 3.3 V CREF RRXi RSN VOUTi DGND RFAi A 1 8 AD RHLi KRi(A) VHLi AGND CADi 6 7 RTESTMi RTi U5 VCCA VSAB 2 CHPi HPA VSABi VTX VCC +3.3 VDC VCCD VINi DTi BATH CS HPB CSSi VLB RFBi B KRi (B) 4 5 VLBi IMT VIMTi CBDi BD RSBi RMTi SB TMS U1 Am79R241 Am79R241 VREF VILGi ILG U2 ISLAC RMGPi RLGi BACK PLANE TMP VREF TMN VREF VREF RMGLi DHi BATH VBH LD LDi GND DLi CBATHi CBATLi P1 P2 P3 VBL P1 P2 BATL P3 SPB SLB BATL RSLB RSVD2 SHB RYE IREF R2H RREF RTESTLi R3H R1 RGFDLi KRi BGND RSVD +5V * CSS required for > 2.2 VRMS metering * Connections shown for one channel Ring Bus RSRBi RSRC 12 BATH RSHB Am79R241 Am79R241 XSBi XSC A D V A N C E I N F O R M A T I O N LINECARD PARTS LIST The following list defines the parts and part values required to meet target specification limits for channel i of the linecard (i = 1,2,3,4). Item Type Value Tol. Rating Comments U1 Am79R241 Am79R241 U2 ISLIC device Am79X22xx Am79X22xx U3, U4 P1001SC P1001SC 100 V TECCOR Battrax protector U5 TISP61089 TISP61089 80 V Transient Voltage Suppresser, Power Innovations ISLAC device D1, D2 Diode 1A 100 V DHi, DLi, DTi Diode 100 mA 100 V 50 ns RFAi, RFBi Resistor 50 2% 2W Fusible PTC protection resistors RSAi, RSBi Resistor 200 k 2% 1/4 W Sense resistors RTi Resistor 80.6 k 1% 1/8 W RRXi Resistor 100 k 1% 1/8 W RREF Resistor 69.8 k 1% 1/8 W Current reference RMGLi, RMGPi Resistor 1 k 5% 1W Thermal management resistors RSHB, RSLB Resistor 750 k 0.5% 1/8 W RHLi Resistor 5.1 k 0.5% 1/8 W RMTi Resistor 3.01 k 0.5% 1/8 W RLGi Resistor 6.04 k 0.5% 1/8 W RTESTMi Resistor 2 k 1% 1W Metallic test RTESTLi Resistor 2 k 1% 1W Longitudinal test CADi, CBDi 1 Capacitor 22 nF 10% 100 V Ceramic, not voltage sensitive CBATHi, CBATLi Capacitor 100 nF 20% 100 V Ceramic CHPi CSi 1 CSSi3 Capacitor 22 nF 20% 100 V Ceramic Capacitor 100 nF 20% 100 V Protector speed up capacitor Capacitor 56 pF 5% 100 V Ceramic Components for External Ringing RGFDi Resistor 510 2% 2W 1.2 W typ RSRBi, RSRc Resistor 750 k 2% 1/4 W Matched to within 0.2% for initial tolerance and 0 to 70° C ambient temperature range.2 17 mW typ KRi Relay 5 V Coil DPDT Notes: 1. Value can be adjusted to suit application. 2. Can be looser for relaxed ring-trip requirements. 3. Required for metering > 2.2 Vrms, otherwise may be omitted. Am79R241 Am79R241 13