Intelligent Accessä Voice Solutions Am79231 Intelligent Subscriber Line Interface Circuit (ISLIC™) DISTINCTIVE CHARACTERISTICS Monitor of two-wire interface voltages and currents supports — Voice transmission — Programmable DC feed characteristics — Independent of battery — Current limited — Selectable off-hook and ground-key thresholds — Subscriber line diagnostics — Leakage resistance — Loop resistance — Line capacitance — Bell capacitance — Foreign voltage sensing — Power cross and fault detection +5 V and battery supplies Dual battery operation for system power saving — Automatic battery switching — Intelligent thermal management Compatible with inexpensive protection networks — Accommodates low tolerance fuse resistors or PTC thermistors Metering capable — 12 kHz and 16 kHz — Smooth polarity reversal Tip-open state supports ground start signaling Ring relay driver for external ringing Integrated test load switches/relay drivers BLOCK DIAGRAM Signal Transmission AD SA HPA Two-Wire Interface HPB Longitudinal Control Gain/Level Shift RSN VTX VLB SB BD Attenuator VSAB VREF TMN TMP TMS Signal Conditioning Thermal Management Control Fault Meas. IMT ILG CREF 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 GND VCC Pub. # 080248 Rev: C Amendment: /0 Issue Date: December 1999 TABLE OF CONTENTS Distinctive Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Distinctive Characteristics of the Intelligent Access™ Voice Chipset . . . . . . . . . . . . . . . . . . . . . . 3 Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Intelligent Access™ Voice Chipsets Linecard With Am79231 . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Linecard Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Environmental Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Electrical Maximum Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Target Specifications (See note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Relay Driver Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Am79231 Transmission Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Am79231 Current-Limit Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Am79231 Fault Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Thermal-Management Equations (All Modes except Standby) . . . . . . . . . . . . . . . . . . 21 Timing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 PL032 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Revision Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Revision A to Revision B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Revision B to Revision C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2 Am79231 Data Sheet The Am79231, in combination with an ISLAC™ 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 Am79231 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 Performs all battery feed, ring-trip, signaling, hybrid and test (BORSCHT) functions Two chip solution supports high density, multichannel architecture Single hardware design meets multiple country requirements through software programming of: — DC loop-feed characteristics and current-limit — Loop-supervision detection thresholds — Off-hook debounce circuit — Ground-key and ring-trip filters — Off-hook detect de-bounce interval — Two-wire AC impedance — Transhybrid balance — Transmit and receive gains — Equalization — Digital I/O pins — A-law/µ-law and linear selection Supports external battery-backed ringing — Unbalanced ringing — Ring relay operation synchronized to zero crossings of ringing voltage and current Selectable PCM or GCI interface — Supports most available master clock frequencies from 512 kHz to 8.192 MHz On-hook transmission Power/service denial mode Line-feed characteristics independent of battery voltage Only 5 V, 3.3 V and battery supplies needed Low idle-power per line Linear power-feed with intelligent powermanagement feature Compatible with inexpensive protection networks; Accommodates low-tolerance fuse resistors while maintaining longitudinal balance Monitors two-wire interface voltages and currents for subscriber line diagnostics Built-in voice-path test modes Power-cross, fault, and foreign voltage detection Integrated line-test features — Leakage — Ring relay driver Exceeds LSSGR and CCITT central office requirements — Integrated ring-trip filter and software enabled manual or automatic ring-trip mode Supports metering generation with envelope shaping Smooth or abrupt polarity reversal — Line and ringer capacitance Adaptive transhybrid balance — Continuous or adapt and freeze Supports both loop-start and ground-start signaling — Loop resistance Integrated self-test features — Echo gain, distortion, and noise 0 to 70°C commercial operation — –40°C to 85°C extended temperature range available Small physical size Up to three relay drivers per ISLIC™ device — Configurable as test load switches Am79231 Data Sheet 3 BLOCK DIAGRAMS Figure 1. Example Four-Channel Linecard Block Diagram 4 7 A1 Am79231 VCCD LD1 B1 DGND1 VREF A2 B2 A3 DGND2 7 Am79231 RC Networks and Protection LD2 4 AGND1 AGND2 Am79231 B3 3 LD3 TSCB P1-P3 DRA/DD 7 Am79231 LD4 B4 IO1-IO4 TSCA/G 7 A4 VCCA RREF Quad ISLAC Am79Q2243 DRB DXB DXA/DU DCLK/S0 5 Ring-Trip Sense Resistors 5 PCLK/FS MCLK RSHB BATH FS/DCL CS/RST RSLB BATL DIO/S1 INT 4 Am79231 Data Sheet Figure 2. Am79231 Block Diagram A Amplifier IA sense AD IA RSN IA 600 SA + - Fault Meas. + HPA - + TMS VTX VREF BGND + HPB Fault Meas. + + β = 0.01 - SB B Amplifier IB VSAB VREF IB sense BD VREF IB 600 TMN TMP VREF Thermal Management Control Gain/Level Shift To Power Amplifiers VLB Thermal Shutdown VBH IMT IA IB − 600 600 ILG Tip Open Active Low Battery IA IB + 600 600 Decoder R2 CREF RD1 RD2 RD3 C1 C2 Control Register R1 BGND Standby RYE OHT Fixed Longitudinal Voltage Active High Battery R3 Reserved VBL Disconnect High Neg. Bat. sel. C3 Demux Power amplifiers positive supply P1 P2 P3 Am79231 Data Sheet LD VCC GND 5 ORDERING INFORMATION Legerity 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. Am79231 J C TEMPERATURE RANGE C = Commercial (0°C to +70°C)* PACKAGE TYPE J = 32-pin plastic leaded chip carrier (PL032) DEVICE NAME/DESCRIPTION Am79231(Intelligent Subscriber Line Interface Circuit) Valid Combinations Valid Combinations Am79231 JC Valid combinations list configurations planned to be supported in volume for this device. Consult the local Legerity sales office to confirm availability of specific valid combinations, and to check on newly released valid combinations. 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 Am79231 Data Sheet AD 1 32 31 30 RSVD 2 BD BGND 4 3 VCC VBH VBL CONNECTION DIAGRAM R1 5 29 SB R2 6 28 SA RYE 7 27 IMT R3 8 26 ILG 25 CREF Am79231 32-Pin PLCC TMS 9 TMP 10 24 RSVD TMN 11 23 HPB P1 12 22 HPA P2 13 21 VTX Am79231 Data Sheet VREF RSN VLB GND VSAB LD P3 14 15 16 17 18 19 20 7 PIN DESCRIPTIONS 8 Pin Pin Name AD, BD A, B Line Drivers I/O O Description Provide the currents to the A and B leads of the subscriber loop. BGND Ground Ground return for high and low battery supplies. CREF +3.3 VDC VCCD reference. It is the digital high logic supply rail, used by the ISLIC to ISLAC interface. GND Ground 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, where ILG 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 Am79231 indicates thermal overload by pulling IMT to CREF. 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 ( >(Vref+0.3V) ), the logic levels on P1–P3 latch into the Am79231 control register bits that operate the mode-decoder. When the LD pin is a logic 0 ( <(Vref-0.3V) ), the logic levels on P1–P3 latch into the Am79231 control register bits that control the relay drivers (RD1–RD3). When the LD pin level is at ~VREF, the control register contents are locked. P1–P3 Control Bus I Inputs to the latch for the operating-mode decoder and the relay-drivers. R1 Ring Relay Driver O Collector connection for ring relay 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. Analog and digital ground return for VCC. RSVD Reserved RYE Relay 2, 3 Common Emitter O Emitter connection for R2 and R3. Normally connected to relay ground. This is used during Legerity testing. In the application, this pin must be left floating. 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 Am79231. 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 Am79231. It is the reference for the longitudinal control loop. When the VLB pin is greater than VREF, the Am79231 sets the longitudinal voltage to a voltage approximately half-way between the positive and negative power supply battery rails. When the VLB pin is driven to levels between 0V and VREF, the longitudinal voltage decreases linearly with the voltage on the VLB pin. VREF 1.4 V Analog Reference I The ISLAC chip provides this voltage which is used by the Am79231 for internal reference purposes. All analog input and output signals interfacing to the ISLAC chip are referenced to this pin. VSAB Loop Voltage O Scaled-down version of the voltage between the sense points SA and SB on this pin. VTX 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 Am79231. Am79231 Data Sheet GENERAL DESCRIPTION The Intelligent Accessä voice chipsets integrate all functions of the subscriber line. Two chip types are used to implement the linecard; an Am79231 device and an ISLAC device. These provide the following basic functions: 1. The Am79231: 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 Am79231. Complete schematics of a linecard using the Intelligent Access voice chipsets for external ringing is shown in Figure 3. The Am79231 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 Am79231 is designed to be used exclusively with the ISLAC devices. The Am79231 requires only +5 V power and the battery supplies for its operation. The Am79231 implements a linear loop-current feeding method with the enhancement of intelligent Thermal Management. This limits the amount of power dissipated on the Am79231 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 WinSLACä 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 Am79231 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 Am79231 performance parameters under software control. The main functions that can be observed and/or controlled through the ISLAC 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 Subscriber line matching Am79231 Data Sheet 9 Ringing Sophisticated line and circuit tests To accomplish these functions, the ISLIC device collects the following information and feeds it, in analog form, to the ISLAC device: The metallic (IMT) and longitudinal (ILG) loop currents The AC (VTX) and DC (VSAB) loop voltage The outputs supplied by the ISLAC device to the ISLIC device are then: A voltage (VHLi) that provides control for the following high-level ISLIC device outputs: —DC loop current —12 or 16 kHz metering signal A low-level voltage proportional to the voice signal (VOUTi) A voltage that controls longitudinal offset for test purposes (VLBi) 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 transhybrid balancing function, permit adjustment of the two-wire termination impedance and provide frequency attenuation adjustment (equalization) of the receive and transmit paths. Adaptive transhybrid 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. Besides the codec functions, the Intelligent Access voice chipset provides all the sensing, feedback, and clocking necessary to completely control ISLIC device functions with programmable parameters. System-level parameters under programmable control include active loop current limits, feed resistance, and feed mode voltages. The ISLAC device supplies complete mode control to the ISLIC device using the control bus (P1P3) and tri-level load signal (LDi). 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 measurement data directly to a higher level processor by way of the PCM voice channel. Both longitudinal and metallic resistance and capacitance can be measured, which allows leakage resistance, line capacitance, and telephones to be identified. 10 Am79231 Data Sheet INTELLIGENT ACCESS™ VOICE CHIPSETS LINECARD WITH AM79231 Figure 3. External Ringing Linecard Schematic RSAi +5 V 3.3 V VCC SA CREF RRXi RSN VOUTi DGND RHLai A RFAi 1 8 RHLbi CHLbi AD KRi(A) AGND VHLi RHLci CADi 6 7 RTi U5 RHLdi CHLdi VREF VCCA VSAB 2 BATH CHPi HPA VSABi VTX VINi VLB VLBi IMT VIMTi VCC +3.3 VDC VCCD CS HPB CSSi RFBi B KRi (B) 4 5 CBDi BD RSBi RMTi SB TMS R TE S T U1 Am79231 VREF VILGi ILG U2 ISLAC RMGPi DT2i*** RLGi BACK PLANE TMP VREF TMN VREF VREF RMGLi DHi BATH VBH LDi GND DLi BATL VBL CBATHi LD CBATLi P1 P1 P2 P2 P3 P3 SPB SLB BATL RSLB RSVD2 SHB BATH RSHB RYE IREF R2H RREF R3H R1 RGFDLi KRi +5 V Ring Bus BGND RSVD XSBi XSC * CSS required for > 2.2 Vrms metering ** Connections shown for one channel *** DT2i is optional - Should be put if there is a chance that this chip may be replaced by Am79R251. RSRBi RSRC Am79231 Data Sheet 11 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 U1 Am79231 U2 Am79X22xx U5 TISP61089 DHi, DLi, DT1i, DT2i4 Diode Value Tol. Rating Comments ISLIC device ISLAC device 100 mA 80 V Transient Voltage Suppresser, Power Innovations 100 V 50 ns RFAi, RFBi Resistor 50 Ω 2% 2W RSAi, RSBi Resistor 200 kΩ 2% 1/4 W RTi Resistor 80.6 kΩ 1% 1/10 W RRXi Resistor 100 kΩ 1% 1/10 W RREF Resistor 69.8 kΩ 1% 1/10 W RMGLi, RMGPi Resistor 1 kΩ 5% 1W RSHB, RSLB Resistor 750 kΩ 1% 1/8 W RHLai Resistor 40.2 kΩ 1% 1/10 W Fusible PTC protection resistors Sense resistors Current reference Thermal management resistors Battery Sense Resistors RHLbi Resistor 4.32 kΩ 1% 1/10 W RHLci Resistor 2.87 kΩ 1% 1/10 W RHLdi Resistor 2.87 kΩ 1% 1/10 W CHLbi Capacitor 3.3 nF 10% 10 V Not Polarized CHLdi Capacitor 0.82 µF 10% 10 V Ceramic RMTi Resistor 3.01 kΩ 1% 1/8 W Metallic Current Sense Resistors RLGi Resistor 6.04 kΩ 1% 1/8 W RTEST Resistor 2 kΩ 1% 1W CADi, CBDi 1 Capacitor 22 nF 10% 100 V CBATHi, CBATLi Capacitor 100 nF 20% 100 V Ceramic CHPi Capacitor 22 nF 20% 100 V Ceramic CSi1 Capacitor 100 nF 20% 100 V Protector speed–up capacitor CSSi3 Capacitor 56 pF 5% 100 V Ceramic RGFDi Resistor 510 Ω 2% 2W 1.2 W typ RSRBi, RSRc Resistor 750 kΩ 2% 1/4 W KRi Relay 5 V Coil Longitudinal Current Sense Resistors Test board Ceramic, not voltage sensitive Matched to within 0.2% for initial tolerance and 0 to 70° C ambient temperature range.2 17 mW typ 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. 4. DT2i is optional - Should be put if there is a chance that this chip may be replaced by Am79R251. 12 Am79231 Data Sheet ELECTRICAL CHARACTERISTICS Power Dissipation Loop resistance = 0 to ∞ unless otherwise noted (not including fuse resistors), 2 x 50 Ω fuse resistors, BATL = –36 V, BATH = –65 V, VCC = +5 V. For power dissipation measurements, DC-feed conditions are as follows: ILA (Active mode current limit) = 25 mA (IRSN = 50 µA) RFD (Feed resistance) = 500 Ω VAS (Anti-sat activate voltage) = 10 V VAPP (Apparent Battery Voltage) = 48 V RTMG1 = RTMG2 (Thermal management resistors) = 1 kΩ Description Test Conditions Min On-Hook Disconnect ISLIC 145 On-Hook Active High Battery ISLIC 270 Off-Hook Active Low Battery RL = 294 Ω ISLIC TMG 620 200 VBH VBL VCC 0.5 0.1 3.1 On-Hook Standby VBH VBL VCC 0.75 0 3.1 On-Hook Transmission Fixed Longitudinal Voltage VBH VBL VCC 1.85 0 5 On-Hook Active High Battery VBH VBL VCC 3.6 0 7.3 Off-Hook Active Low Battery RL = 294 Ω VBH VBL VCC .7 26.9 7.5 On-Hook Disconnect Am79231 Data Sheet Unit 65 On-Hook Transmission Fixed Longitudinal Voltage Power Supply Currents Max 50 On-Hook Standby Power Dissipation Normal Polarity Typ mW mA 13 Thermal Resistance The junction to air thermal resistance of the Am79231 in a 32-pin, PLCC package is 45°C/W. The typical junction to case thermal resistance is 14°C/W. Measured under free air convection conditions and without external heatsinking. Absolute Maximum Ratings Storage temperature –55 to +150°C Ambient temperature, under bias –40 to +85°C Humidity TBD VCC with respect to GND –0.4 to +7 V 2 VBH, VBL with respect to GND +0.4 to –70 V BGND with respect to GND –3 to +3 V Voltage on relay outputs +7 V AD or BD to BGND: Continuous VBH – 1 to BGND + 1 10 ms (F = 0.1 Hz) VBH – 5 to BGND + 5 1 µs (F = 0.1 Hz) VBH – 10 to BGND + 10 250 ns (F = 0.1 Hz) VBH – 15 to BGND + 15 Current into SA or SB: 10 µs rise to Ipeak; 1000 µs fall to 0.5 Ipeak; 2000 µs fall to I =0 Ipeak = ±5 mA Current into SA or SB: 2 µs rise to Ipeak; 10 µs fall to 0.5 Ipeak; 20 µs fall to I = 0 Ipeak = ±12.5 mA SA SB continuous 5 mA Current through AD or BD ± 150 mA P1, P2, P3, LD to GND –0.4 to VCC + 0.4 V ESD Immunity (Human Body Model) 1500 V min Maximum power dissipation,1TA = 70°C TA = 85°C 1.67 W 1.33 W Notes: 1. Thermal limiting circuitry on chip will shut down the circuit at a junction temperature of about 165°C. The device should never see this temperature. Operation above 145°C junction temperature may degrade device reliability. 2. Rise time of VBH (dv/dt) must be limited to less than 27 v/µs. Operating Ranges Operating ranges define those limits between which device functionality is guaranteed. 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. Environmental Ranges Ambient Temperature 0 to 70°C Commercial Ambient Relative Humidity 15 to 85% –40 to +85 °C extended temperature Electrical Maximum Ranges VCC VBL VBH BGND with respect to GND Load resistance on VTX to Vref Load resistance on VSAB to Vref 5 V ± 5% –(Vloopmax + 6V + Vpk) to VBH V –42.5 V to –70 V –100 mV to +100 mV 20 kΩ minimum 20 kΩ minimum Note: Vloopmax: Maximum expected loop voltage in application; ILOOP • maximum off-hook loop resistance. Vpk: Peak signal voltage for application. 14 Am79231 Data Sheet SPECIFICATIONS Target Specifications (See note 1) No. Item 1 Two-wire loop voltage (including offset) Condition Standby mode, open circuit, |VBH| < 55 V |VBH| > 55 V Any Active mode (does not include OHT), RL = 600 Ω, IRSN = 50 µA OHT mode, RL = 600 Ω IRSN = 20 µA 2 Feed resistance per leg at pins AD & BD Standby mode 3 Feed current limit Feed current Standby mode, RL = 600 Ω IMT current Standby mode, RL = 2200 Ω ILG current Standby mode A to VBH B to Ground 4 5 Ternary input voltage boundaries for LD pin. Mid-level input source must be Vref. Low boundary High boundary Input high current Input low current Mid-level current Logic Inputs P1, P2, P3 Input high voltage Input low voltage Input high current Input low current Min Typ Max VBH – 8 48 13.88 VBH–7 51 15 VBH–6 55.5 16.13 8.64 19.8 10.8 22 12.96 130 250 375 Ω 34 45 mA 44.6 Unit Note V 3 56 µA 36 43 0.6 CREF – 1 108 47 51 2.0 0.8 10 50 –50 — — — — 3 V V µA µA 6 VTX output offset 7 VREF input current VREF = 1.4 V .05 mA 3 8 CREF input current CREF = 3.3 V .09 mA 3 9 β, DC Ratio of VSAB to loop voltage: Tj < 145°C, VSA – VSB = 22 V V SAB β = ---------------------V SA – V SB 10 Fault Indicator Threshold 11 Gain from VLB pin to A or B pin 12 VLB pin input current +50 V V µA µA µA mV 0.0088 0.0097 0.0106 V/V TBD CREF 0.3 V CREF V Voltage Output on IMT VLB = VREF ±1 V 30 V/V TBD mA 13 ILOOP/IMT ILOOP = 10 mA 275 300 325 A/A 14 ILONG/ILG ILONG = 10 mA 560 600 640 A/A 15 Input current, SA and SB pins Active modes 1.0 3.0 16 K1 Incremental DC current gain 500 17 ISA/IMT Disconnect, ISA = 2 mA 18 ISB/ILG Disconnect, ISB = 2 mA 19 VSAB output offset 20 IMT output offset -3 0 3 mV 21 ILG output offset -1 1 3 mV 6 3 A/A 12 TBD Am79231 Data Sheet µA 3 mV 15 Relay Driver Specifications Item Condition On Voltage Min 25 mA/relay sink Typ Max 0.4 0.5 Unit Note 3 V 40 mA/ relay sink Figure 4. R2,R3 Off Leakage R2,R3 = BGND RYE = VBH Zener Break Over Iz = 100 µA Zener On Voltage Iz = 30 mA 0.8 0 6.6 100 3 µA 7.9 V 11 V Relay Driver Configuration R3 R2 RYE BGND BGND Figure 4A. Ring Relay Driver R1 BGND 16 1.0 Am79231 Data Sheet Am79231 Transmission Specifications No. Item Condition Min f = 300 to 3400 Hz Typ Max 1 RSN input impedance 1 2 VTX output impedance 3 Max, AC + DC loop current 4 Input impedance, A or B to GND Active mode 5 2-4 wire gain –10 dBm, 1 kHz, 0 to 70°C TA = –40°C to 85°C 6 2-4 wire gain variation with frequency 300 to 3400 Hz, relative to 1 kHz TA=–40°C to 85°C –0.1 +.1 7 2-4 wire gain tracking +3 dBm to –55 dBm Reference: –10 dBm TA = –40 to 85°C –0.1 +0.1 Ω 3 Active High Battery or Active Low Battery 70 –14.13 –14.18 mA 70 135 –13.98 –13.98 –13.83 –13.78 4-2 wire gain –10 dBm, 1 kHz TA= –40°C to 85°C –0.15 9 4-2 wire gain variation with frequency 300 to 3400 Hz, relative to 1 kHz –0.1 +0.1 10 4-2 wire gain tracking +3 dBm to –55 dBm Reference: –10 dBm –0.1 +0.1 11 Total harmonic distortion level 2-wire 4-wire overload level at VTX 300 Hz to 3400 Hz 0 dBm 11.2 dBm –12 dBm –0.8 dBm RLOAD = 600 Ω Idle channel noise C-message Active modes RL = 600 Ω 12 Weighted Psophometric Weighted 0 TBD 4-wire 2-wire TA = –40 to 85°C 3 Ω 6 6 dB dB dB dB Vp 3 +11 dBrnC 3 –79 dBmp ±1 +7 TBD –7 –83 TBD –97 3 +0.15 –50 –40 –48 –38 2-wire TA = –40 to 85°C Note dB TBD 8 4-wire Unit 3 4-wire 13 Longitudinal balance (IEEE method) Normal Polarity L-T 200 to 1000 Hz TA = –40°C to 0°C/70°C to 85°C 1000 to 3400 Hz TA = –40°C to 0°C/70°C to 85°C 58 53 53 48 T-L 40 200 to 3400 Hz L - T, IL = 0 50 to 3400 Hz 63 58 63 dB 4 Reverse Polarity L-T 200 to 1000 Hz TA = –40°C to 0°C/70°C to 85°C 50 48 14 PSRR (VBH, VBL) 50 to 3400 Hz 3.4 to 50 kHz 25 45 40 4, 5 2, 3, 5 15 PSRR (VCC) 50 to 3400 Hz 3.4 to 50 kHz 25 45 35 4, 5 2, 3, 5 16 Longitudinal AC current per wire F = 15 to 60 Hz Active mode 20 30 17 Metering distortion Freq = 12 kHz 2.8 Vrms Freq = 16 kHz metering load = 200 Ω 40 Am79231 Data Sheet mArms 3 dB 3 17 Am79231 Current-Limit Behavior SLIC Mode Condition Min Typ Max Unit Note 1 VBH/200 kΩ 100 µA A 7 Disconnect Applied fault between ground and T/R VBH applied to Tip or Ring Tip Open Ring Short to GND 32 34 37 Standby Short Tip-to-VBH Short Ring-to-GND 24 26 38 35 47 44 mA Am79231 Fault Indications Fault Indication No Fault IMT operates normally (Vref ±1V) Thermal Shutdown IMT above 2.8 V; ILG operates normally Unit Note Notes: 1. Unless otherwise specified, test conditions are: VCC = 5 V, RMG1 = RMG2 = 1 kΩ, BATH = –65 V, BATL = 36 V, VBL = 34, RRX = 150 kΩ, RL = 600 Ω, RSA = RSB = 200 kΩ, RFA = RFB = 50 Ω, CHP = 22 nF, CAD = CBD = 22 nF, IRSN = 84 µA. DC-feed conditions are normally set by the ISLAC device. When the Am79231 is tested by itself, its operating conditions must be simulated as if it were connected to an ideal ISLAC device. 30 K 30 K RT Network 390 pf VREF 2. These tests are performed with the following load impedances: Frequency < 12 kHz – Longitudinal impedance = 500 Ω; metallic impedance = 300 Ω Frequency > 12 kHz – Longitudinal impedance = 90 Ω; metallic impedance = 135 Ω 3. Not tested or partially tested in production. This parameter is guaranteed by characterization or correlation to other tests. 4. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization. 5. When the Am79231 and ISLAC device is in the anti-sat operating region, this parameter is degraded. The exact degradation depends on system design. 6. –55 dBm gain tracking level not tested in production. This parameter is guaranteed by characterization and correlation to other tests. 7. This spec is valid from 0 V to VBL or –50 V, whichever is lower in magnitude. 18 Am79231 Data Sheet Operating Modes The Am79231 receives multiplexed control data on the P1, P2 and P3 pins. The LD pin then controls the loading of P1, P2, and P3 values into the proper bits in the Am79231 control register. When the LD pin is less than 0.3 V below VREF ( < (VREF – 0.3 V) ), P1–P3 must contain data for relay control bits RD1, RD2 and RD3. These are latched into the first three bits in the Am79231 control register. When the LD pin is more than 0.3 V above VREF (> (VREF + 0.3 V) ), P1–P3 must contain ISLIC control data C1, C2, and C3, which are latched into the last three bits of the Am79231 control register. Connecting the LD pin to VREF locks the contents of the Am79231 control register. The operating mode of the Am79231 is determined by the C1, C2, and C3 bits in the control register of the Am79231. Table 1 defines the Am79231 operating modes set by these signals. Under normal operating conditions, the ISLIC device does not have active relays. The Am79231 to ISLAC device interface is designed to allow continuous real-time control of the relay drivers to avoid incorrect data loads to the relay bit latches of the Am79231 devices. To perform external ringing, the ISLAC device from the Intelligent Access voice family is set to external ringing mode (RMODE = 1), enables the ring relay, and puts the Am79231 in the Standby mode. Table 1. Operating Modes Connection to RMGPi & RMGLi Resistors Battery Voltage Selection Operating Mode Standby1 High Battery (BATH) and BGND (High ohmic feed): Loop supervision active, A and B amplifiers shut down Open 1 Tip Open1 High Battery (BATH) and BGND Tip Open: AD at High-Impedance, Channel A power amplifier shut down Open 1 0 On-Hook Transmission, Fixed Longitudinal Voltage High Battery (BATH) and BGND Fixed longitudinal voltage of –30 V 0 1 1 Disconnect Low Battery selection at VBL AD and BD at High-Impedance, Channel A and B power amplifiers shut down 1 0 0 RSVD 1 0 1 Active High Battery High Battery (BATH) and BGND 1 1 0 Active Low Battery Low Battery (BATL) and BGND 1 1 1 RSVD C3 C2 C1 0 0 0 0 0 0 Operating Mode A and B Amplifier Output Active feed, normal or reverse polarity Note: 1. In these modes, the ring lead (B-lead) output has a –50 V internal clamp to battery ground (BGND). Am79231 Data Sheet 19 Table 2. Mode Descriptions Operating Mode Disconnect Description This mode disconnects both A and B output amplifiers from the AD and BD outputs. The A and B amplifiers are shut down and the Am79231 selects the low battery voltage at the VBL pin. In the Disconnect state, the currents on IMT and ILG represent the voltages on the SA and SB pins, respectively. These currents are scaled to produce voltages across V 400 V 400 SA SB RMTi and RLGi of ---------- and --------- , respectively. Standby The power amplifiers are turned off. The AD output is driven by an internal 250 Ω (typical) resistor, which connects to ground. The BD output is driven by an internal 250 Ω (typical) resistor, which connects to the high battery (BATH) at the VBH pin, through a clamp circuit, which clamps at –50 V with respect to BGND. For VBH values above –55 V, the opencircuit voltage, which appears at this output is ~VBH + 5 V. If VBH is below –55 V, the voltage at this output is –50 V. The battery selection for the balance of the circuitry on the chip is VBL. Line supervision remains active. Current limiting is provided on each line to limit power dissipation under short-loop conditions as specified in the “Am79231 CurrentLimit Behavior” section. In external ringing, the standby ISLIC state is selected. Tip Open In this mode, the AD (Tip) lead is opened and the BD (Ring) lead is connected to a clamp, which operates from the high battery on VBH pin and clamps to approximately –50 V with respect to BGND through a resistor of approximately 250 Ω (typical). The battery selection for the balance of the circuitry on the chip is VBL. To prevent excessive power dissipation, the current in the Ring lead is limited by an internal current source to 30 mA. Active High Battery In the Active High Battery mode, battery connections are as shown in Table 1. Both output amplifiers deliver the full power level determined by the programmed DC-feed conditions. Active High Battery mode is enabled during a call in applications when a long loop can be encountered. Active Low Battery Both output amplifiers deliver the full power level determined by the programmed DC-feed conditions. VBL, the low negative battery, is selected in the Active Low Battery mode. This is typically used during the voice part of a call. On-Hook Transmission (OHT), Fixed Longitudinal Voltage In the On-Hook Transmission, Fixed Longitudinal Voltage mode, battery connections are as shown in Table 1. The longitudinal voltage is fixed at –30 V to allow compliance with safety specifications for some classes of products. Control bits RD1, RD2, and RD3 do not affect the operating mode of the Am79231. These signals usually perform the following functions. Table 3. Driver Descriptions Driver Description R1 A logic 1 on RD1 turns the R1 driver on and operates a relay connected between the R1 pin and VCCD. R1 drives the ring relay. R2 A logic 1 on the RD2 signal turns the R2 driver on and routes current from the R2 pin to the RYE pin. In the option where the RYE pin is connected to ground, the R2 pin can sink current from a relay connected to VCCD. Another option is to connect the RYE pin to the BD (Ring) lead through a diode and connect a test load between R2 and the AD (Tip) lead. This technique avoids the use of a relay to connect a test load. However, it does not isolate the subscriber line from the linecard. The test load must be connected to the Am79231 side of the protection resistor to avoid damage to the R2 driver. 20 Am79231 Data Sheet Driver Description R3 A logic 1 on the RD3 signal turns the R3 driver on and routes current from the R3 pin to the RYE pin. In the option where the RYE pin is connected to ground, the R3 pin can sink current from a relay connected to VCCD. Another option is to connect the RYE pin to the B (Ring) lead through a diode and connect a test load between R3 and the A (Tip) lead. This technique avoids the use of a relay to connect a test load. However, it does not isolate the subscriber line from the linecard. The test load must be connected to the Am79231 side of the protection resistor to avoid damage to the R3 driver. Thermal-Management Equations (All Modes except Standby) TMG resistor-current is limited to be 5 mA < IL. If IL < 5 mA, no current flows in the TMG resistor and it all flows in the Am79231. IL < 5 mA PSLIC = (SBAT – ILRL) • IL + 0.3 W PTMG = 0 IL > 5 mA PSLIC = (SBAT – IL(RL + 2 • RFUSE))*IL + 0.3 W – PTMG PTMG = (IL – 5 mA)^2 • (RTMG1 + RTMG2) These equations are valid when RTMGX • (IL – 5 mA) < (SBAT – RLIL)/2 – 2 because the longitudinal voltage is one-half the battery voltage and the TMG switches require approximately 2 V. TIMING SPECIFICATIONS Symbol Signal Parameter Min Typ Max trSLD LD Rise time Am79231 LD pin 2 tfSLD LD Fall time Am79231 LD pin 2 tSLDPW LD LD minimum pulse width tSDXSU P1,P2,P3 P1–3 data Setup time 4.5 tSDXHD P1,P2,P3 P1–3 data hold time 4.5 tSDXD P1,P2,P3 Max P1–3 data delay 3 Unit µs 5 Notes: 1. The P1–3 pins are updated continuously during operation by the LD signal. 2. After a power-on reset or hardware reset, the relay outputs from the Am79231 turn all relays off. An unassuming state is to place the relay control pins, which are level triggered, to a reset state for all relays. Any noise encountered only raises the levels toward the register lock state. 3. When writing to the ISLIC registers, the sequence is: a. Set LD pin to mid-state b. Place appropriate data on the P1–3 pins c. Assert the LD pin to High or Low to write the proper data d. Return LD pin to mid-state 4. Am79231 registers are refreshed at 5.33 kHz when used with an ISLAC device. 5. If the clock or MPI becomes disabled, the LD pins and P1–3 returns to 0 V state, thus protecting the Am79231 and the line connection. 6. Not tested in production. Guaranteed by characterization. Am79231 Data Sheet 21 WAVEFORMS Write State Register VCC LD VREF Lock Registers 0V Write Relay Register Previous P1,P2,P3 Relay Data Relay Data State Data New Relay Data DETAIL A VREF LD Write State Register tr SLD tf SLD VREF Write Relay Register t SLDPW t SDXSU t SDXHD P1,P2,P3 22 Am79231 Data Sheet PHYSICAL DIMENSIONS PL032 .447 .453 .485 .495 .009 .015 .585 .595 .042 .056 .125 .140 Pin 1 I.D. .080 .095 .547 .553 SEATING PLANE .400 REF. .490 .530 .013 .021 .050 REF. .026 .032 TOP VIEW SIDE VIEW 16-038FPO-5 PL 032 DA79 6-28-94 ae REVISION SUMMARY Revision A to Revision B • Revision A was a condensed version of the datasheet while Revision B contained the full version. Revision B to Revision C • Page 12, Linecard Parts List, Rows CHLbi and CHLdi: switched the numbers in the “Values” column. Am79231 Data Sheet 23 Notes: www.legerity.com Notes: www.legerity.com Legerity provides silicon solutions that enhance the performance, speeds time-to-market, and lowers the system cost of our customers' products. By combining process, design, systems architecture, and a complete set of software and hardware support tools with unparalleled factory and worldwide field applications support, Legerity ensures its customers enjoy a smoother design experience. It is this commitment to our customers that places Legerity in a class by itself. The contents of this document are provided in connection with Legerity, Inc. products. Legerity makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. 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Legerity reserves the right to discontinue or make changes to its products at any time without notice. © 1999 Legerity, Inc. All rights reserved. Trademarks Legerity, the Legerity logo and combinations thereof, Intelligent Access, ISLIC, ISLAC and WinSLAC are trademarks of Legerity, Inc. Other product names used in this publication are for identification purposes only and may be trademarks of their respective companies. P.O. Box 18200 Austin, Texas 78760-8200 Telephone: (512) 228-5400 Fax: (512) 228-5510 North America Toll Free: (800) 432-4009 To contact the Legerity Sales Office nearest you, or to download or order product literature, visit our website at www.legerity.com. To order literature in North America, call: (800) 572-4859 or email: [email protected] To order literature in Europe or Asia, call: 44-0-1179-341607 or email: Europe — [email protected] Asia — [email protected]