ISLIC™ Intelligent Subscriber Line Interface Circuit Am79R240 device APPLICATIONS DESCRIPTION Optimized for Voice over Broadband and related applications FEATURES In combination with an ISLAC™ device, the Am79R240 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 Am79R240 device has integrated self-test capabilities to resolve faults to the line circuit. RELATED LITERATURE — — — — Cable telephony Integrated Access Devices (IAD) Smart Residential Gateways (SRG) LAN Systems Monitor of two-wire interface voltages and currents supports — Voice transmission — Through chip ring generation — Programmable DC feed characteristics – Independent of battery – Current limited — Selectable off-hook and ground-key thresholds — Power cross and fault detection Supports internal short loop ringing 080250 Am79Q2241/2242/2243 QISLAC Data Sheet 080274 Am79D2251 DISLAC Data Sheet 080262 Intelligent Access™ Voice Solutions Evaluation Board User’s Guide 080344 Am79R240/Am79Q224x ISLIC™/Quad ISLAC™ Technical Reference 080345 Am79R240/Am79D2251 ISLIC™/Dual ISLAC™ Technical Reference +5 V and battery supplies Dual battery operation for system power saving — Automatic battery switching Compatible with inexpensive protection networks — Accommodates low tolerance fuse resistors or PTC thermistors Metering capable — 12 kHz and 16 kHz Tip-open state supports ground start signaling 5 REN with 15 V DC offset trapezoid. BLOCK DIAGRAM Signal Transmission RSN VTX Attenuator VSAB AD SA HPA HPB Longitudinal Control Two-Wire Interface SB BD For US standard: — drives ring up to 4.4 kft of 26 gauge wire. or — drives ring up to 7 kft of 24 gauge wire. For European (British) standard: — drives ring up to 1.7 km of 0.5 mm copper cable. VREF Signal Conditioning IMT ILG CREF Fault Meas. VBL Switch Driver VBH ORDERING INFORMATION Package VCC GND 32-pin PLCC BGND Device Am79R241JC P1 P2 P3 LD Input Decoder and Control Registers An ISLAC™ device must be used with this part. Publication# 080693 Version 1.0 Am79R240 Data Sheet Rev: Date: D Sep 26, 2001 Table of Contents APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 ORDERING INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 RELATED LITERATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 AM79R240 DEVICE INTERNAL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 FEATURES OF THE INTELLIGENT ACCESS™ CHIP SET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 CHIP SET BLOCK DIAGRAM - TWO CHANNEL LINE CARD EXAMPLE . . . . . . . . . . . . . . . . . . .6 CONNECTION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 PIN DESCRIPTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 THERMAL RESISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 ELECTRICAL OPERATING RANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Environmental Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Electrical Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 POWER DISSIPATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 DC SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 TRANSMISSION SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 RINGING SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 CURRENT-LIMIT BEHAVIOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 THERMAL SHUTDOWN FAULT INDICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 OPERATING MODE DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 THERMAL-MANAGEMENT EQUATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 TIMING SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 WAVEFORMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 APPLICATION CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 INTERNAL RINGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 LINE CARD PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 PHYSICAL DIMENSIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 PL 032 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 REVISION B TO C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 REVISION C TO D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 2 Am79R240 Data Sheet PRODUCT DESCRIPTION The Intelligent Access™ voice chip sets integrate all functions of the subscriber line. Two chip types are used to implement the line card — an Am79R240 device and an ISLAC device. Current ISLAC devices include the Am79Q2241/2242/2243 and the Am79D2251. These provide the following basic functions: 1. 2. The Am79R240 device: A high voltage, bipolar device that drives the subscriber line, maintains longitudinal balance and senses line conditions. The ISLAC device: A low voltage CMOS IC that provides conversion, control and DSP functions for the Am79R240 device. A complete schematic of a line card using the Intelligent Access voice chip sets for internal ringing is shown in the “Chip Set Block Diagram - Two Channel Line Card Example” on page 6. The Am79R240 device 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 Am79R240 device is designed to be used exclusively with the ISLAC devices. The Am79R240 device requires only +5 V power and the battery supplies for its operation. The Am79R240 device implements a linear loop-current feeding method. The 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 and supervision 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 chip set 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 chip sets provide system level solutions for the loop supervisory functions and metering. In total, they provide a programmable solution that can satisfy worldwide line card 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, and allows the designer to enter a description of system requirements. WinSLAC then computes the necessary coefficients and plots the predicted system results. The Am79R240 device includes circuitry to report Tip•Ring voltage and metallic and longitudinal currents to the ISLAC device. These inputs allow the ISLAC device to place several key Am79R240 device 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 Subscriber line voltage and currents Ring-trip detection Abrupt and smooth battery reversal Subscriber line matching Ringing generation 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 – Internal ringing signal – 12 or 16 kHz metering signal A low-level voltage proportional to the voice signal (VOUTi) 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. Am79R240 Data Sheet 3 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 and loaded into the ISLAC device registers using the system microprocessor. The PCM codes can be either 16-bit linear twos-complement or 8-bit companded A-law or µ-law. Besides the codec functions, the Intelligent Access voice chip set 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 (P1-P3) and tri-level load signal (LDi). The Intelligent Access voice chipset provides extensive loop supervision capability including off-hook, 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. AC and DC fault detection is also provided. Note: i denotes channel number 4 Am79R240 Data Sheet AM79R240 DEVICE INTERNAL BLOCK DIAGRAM AD IA sense IA RSN IA 600 SA A Amplifier + - + - HPA + VTX VREF + - HPB + + β= 0.01 - SB VREF B Amplifier IB BD VSAB IB sense VREF IB 600 VREF To Power Amplifiers ILG Disconnect Active Low Battery IMT IA IB 600 600 Tip Open Internal Ringing Standby OHT Fixed Longitudinal Voltage IA IB + 600 600 Active High Battery VBL Thermal Shutdown High Neg Batt Select Reserved VBH Decoder CREF RSVD RSVD RSVD C1 Control Register C2 C3 Demux BGND Power amplifiers positive supply P1 P2 P3 Am79R240 Data Sheet LD VCC GND 5 FEATURES OF THE INTELLIGENT ACCESS™ CHIP SET • • • • • Performs all battery feed, ringing, signaling, hybrid and test (BORSCHT) functions Two chip solution supports high density, multi-channel architecture Single hardware design meets multiple country requirements through software programming of: – Ringing waveform and frequency – 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 internal balanced ringing with offset – Self-contained ringing generation and control – Integrated ring-trip filter and software enabled manual or automatic ring-trip mode Supports metering generation with envelope shaping • • • • Polarity reversal Supports both loop-start and ground-start signaling Exceeds central office requirements 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 Compatible with inexpensive protection networks; Accommodates low-tolerance fuse resistors while maintaining longitudinal balance Monitors two-wire interface voltages and currents Power-cross and fault detection Integrated self-test features and built-in voice-path test modes – Echo gain, distortion, and noise Guaranteed performance over commercial temperature range. Small physical size • • • • • • • • • • • • Chip Set Block Diagram - Two Channel Line Card Example 6 A1 B1 4 VCCA LD1 Am79R240 VCCD VREF RC Networks and Protection DGND1 AGND1 AGND2 3 P1-P3 6 A2 LD2 Am79R240 DGND2 TSCA/G B2 RREF DRA/DD Dual ISLAC Am79D2251 DXA/DU DCLK/S0 PCLK/FS MCLK RSHB BATH CS/RST RSLB BATL 6 Am79R240 Data Sheet DIO/S1 INT RSPB BATP FS/DCL VBL VBH VCC BGND BD AD RSVD CONNECTION DIAGRAM 4 3 2 1 32 31 30 RSVD 5 29 SB RSVD 6 28 SA RSVD 7 27 IMT 26 ILG 25 CREF RSVD 8 RSVD 9 RSVD 10 24 RSVD RSVD 11 23 HPB P1 12 22 HPA P2 13 21 VTX 17 18 19 20 GND RSN VREF P3 16 VSAB 15 CREF 14 LD Am79R240 32-Pin PLCC Note: Pin1 is marked for orientation. RSVD = Reserved. Do not connect to this pin. Am79R240 Data Sheet 7 PIN DESCRIPTIONS 8 Pin Pin Name I/O AD, BD A, B Line Drivers O Description 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 device to ISLAC device interface. 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, 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 Am79R240 device indicates thermal overload by pulling IMT to CREF. The LD pin controls the input latch and responds to a 3-level input. When the LD pin is a logic 1 < (VREF + 0.3 V), the logic levels on P1 – P3 latch into the Am79R240 device control register bits that operate the mode-decoder. When the LD pin level is at < VREF ± 0.3 V, the control register contents are locked. Provide the currents to the A and B leads of the subscriber loop. LD Register Load I P1 – P3 Control Bus I Inputs to the latch for the operating-mode decoder and the relay-drivers. 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. RSN Receive Summing Node RSVD Reserved SA, SB A, B Lead Voltage Sense 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 Positive supply for low voltage analog and digital circuits in the Am79R240 device. VREF 1.4 V Analog Reference I The ISLAC chip provides this voltage which is used by the Am79R240 device for internal reference purposes. All analog input and output signals interfacing to the ISLAC chip are referenced to this pin. VSAB ILOOP 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. This is used during Legerity testing. In the application, these pins must be left floating. 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. Am79R240 Data Sheet Absolute Maximum Ratings Stresses greater than those listed under Absolute Maximum Ratings can cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute maximum ratings for extended periods can affect device reliability. Storage temperature Ambient temperature, under bias Humidity VCC with respect to GND –55 to +150°C 0 to 70°C 5% to 95% –0.4 to +7 V VBH, VBL with respect to GND (See Note 2) +0.4 to –95 V –3 to +3 V BGND with respect to GND 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) Current into SA or SB: 10 µs rise to IPEAK 1000 µs fall to 0.5 IPEAK; 2000 µs fall to I =0 Current into SA or SB: 2 µs rise to IPEAK 10 µs fall to 0.5 IPEAK 20 µs fall to I = 0 SA SB continuous Current through AD or BD P1, P2, P3, LD to GND ESD Immunity (Human Body Model) Maximum power dissipation (See Note 1) VBH - 15 to BGND + 15 IPEAK = ±5 mA IPEAK = ±12.5 mA 5 mA ± 150 mA –0.4 to VCC + 0.4 V TA = 70°C 1500 V min 1.67 W Note: 1. Thermal limiting circuitry on chip will shut down the circuit at a junction temperature of about 165°C. 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. Thermal Resistance The junction to air thermal resistance of the Am79R240 device 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 heat sinking. Electrical Operating Ranges Legerity guarantees the performance of this device over commercial (0°C to 70°C) temperature ranges by conducting a production test with single insertion coupled to periodic sampling. These characterization and test procedures comply with section 4.6.2 of Bellcore TR-TSY-000357 Component Reliability Assurance Requirements for Telecommunications Equipment. Environmental Ranges Ambient Temperature 0 to 70°C Commercial Ambient Relative Humidity 15 to 85% Electrical Ranges Voltage at VCC 5 V ± 5% Voltage at VBL –15 V to VBH Voltage at VBH –42.5 V to –90 V BGND with respect to GND –100 mV to +100 mV Load resistance on VTX to VREF 20 kΩ minimum Load resistance on VSAB to VREF 20 kΩ minimum Am79R240 Data Sheet 9 SPECIFICATIONS Power Dissipation Loop resistance = 0 to ∞ unless otherwise noted (not including fuse resistors), 2 x 50 Ω fuse resistors, BATL = –24 V, BATH = –90 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 Description Test Conditions Min On-Hook Disconnect On-Hook Standby Power Dissipation Normal Polarity Power Supply Currents 10 On-Hook Transmission Fixed Longitudinal Voltage ISLIC On-Hook Active High Battery ISLIC Off-Hook Active Low Battery RL = 294 Ω ISLIC Typ Max 55 80 80 125 175 250 340 450 900 1050 On-Hook Disconnect VBH VBL VCC 0.4 0.1 3.0 0.7 On-Hook Standby VBH VBL VCC 0.75 0 3.1 1.2 On-Hook Transmission Fixed Longitudinal Voltage VBH VBL VCC 1.85 0 5 3.0 On-Hook Active High Battery VBH VBL VCC 3.6 0 7.3 5.0 Off-Hook Active Low Battery RL = 294 Ω VBH VBL VCC 0.9 26.9 7.5 2.0 Am79R240 Data Sheet Unit mW 4.0 4.0 mA 6.5 8.5 10 DC SPECIFICATIONS 30 k Ω 30 k Ω RT Network 390 pf VREF Unless otherwise specified, test conditions are: VCC = 5 V, BATH = –90 V, BATL = –24V, RRX = 150 kΩ, RL = 600 Ω, RSA = RSB = 200 kΩ, RFA = RFB = 50 Ω, CHP = 22 nF, CAD = CBD = 22 nF, IRSN = 50 mA, Active low battery. DC-feed conditions are normally set by the ISLAC device. When the Am79R240 device is tested by itself, its operating conditions must be simulated as if it were connected to an ideal ISLAC device. No. 1 2 Item Min Typ Max Unit Note VBH - 8 48 VBH - 7 51 V 2 13.5 15 VBH - 6 55.5 56.5 16.5 Standby mode 130 250 375 W 2 Feed current limit Standby mode, RL = 600 Ω 18 34 45 mA IMT current Standby mode, RL = 2200 Ω 44.6 56 ILG current Standby mode A to VBH B to Ground Ternary input voltage boundaries for LD pin. Midlevel 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 Two-wire loop voltage (including offset) Feed resistance per leg at pins AD & BD 3 4 5 Condition Standby mode, open circuit, |VBH| < 55 V |VBH| > 55 V GND − VB Active mode, RL = 600 Ω, IRSN = 20 µA 6 VTX output offset 7 VREF input current VREF = 1.4 V CREF input current CREF = 3.3 V 8 µA 28 28 CREF - 1 VREF + 0.3 108 47 51 2.0 –20 –20 –50 V V µA µA µA 0 0 0.8 20 20 V V µA µA 0 +50 mV 50 2 2 2 µA 2 2 –3 0 3 µA 0.0088 0.0097 0.0106 V/V ß, DC Ratio of VSAB to loop voltage: 9 V SAB β = ---------------------------V SA – V SB Tj < 145°C, VSA - VSB = 22 V ILOOP/IMT ILOOP = 10 mA 275 300 325 A/A 11 ILONG/ILG ILONG = 10 mA 560 605 650 A/A 12 Input current, SA and SB pins Active modes 1.0 3.0 µA 2 13 K1 Incremental DC current gain 500 537.5 A/A 2 10 Am79R240 Data Sheet 462.5 11 Transmission Specifications No. Item Condition Min Typ f = 300 to 3400 Hz Max 1 RSN input impedance 2 VTX output impedance 3 Max, AC + DC loop current Active High Battery or Active Low Battery 4 Longitudinal impedance, A or B to GND Active mode 5 2-4 wire gain –10 dBm, 1 kHz, 0 to 70°C 14.18 6 2-4 wire gain variation with frequency 300 to 3400 Hz, relative to 1 kHz –0.15 +0.15 7 2-4 wire gain tracking +3 dBm to –55 dBm Reference: –10 dBm –0.15 +0.15 50 70 135 13.98 13.78 4-2 wire gain –10 dBm, 1 kHz –0.20 +0.20 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 –0.15 +0.15 Total harmonic distortion level 2-wire 300 Hz to 3400 Hz 0 dBm 4-wire –14 dBm 4-wire overload level at VTX OHT RLOAD = 600 Ω VAB - 50 V 0 dBm ±1 –50 Idle channel noise C-message Active modes, RL = 600 Ω 2-wire 4-wire 2-wire 4-wire +9 –5 –8 –95 12 Psophometric Weighted T-L 200 to 3400 Hz 40 –78 2 Ω 2 5 dB 3 dB 2 Vp dB 2 2 dBrnC dBmC dBmp dBmp 2 2 dB 3, 4 1, 2, 4 2 13 Longitudinal balance (IEEE method) Active 14 PSRR (VBH, VBL) 50 to 3400 Hz 3.4 to 50 kHz 25 45 40 15 PSRR (VCC) 50 to 3400 Hz 3.4 to 50 kHz 25 45 35 16 Longitudinal AC current per wire F = 15 to 60 Hz Active mode 10 mArms 2 Metering distortion Freq = 12 kHz 0.5 Vrms Freq = 16 kHz Metering load = 200 Ω 40 dB 2 17 52 +12 mA 5 –48 200 to 3400 Hz 2 dB –50 L-T Note Ω 3 8 11 Unit 1 3, 4 1, 2, 4 Ringing Specifications Item Condition Ringing Voltage Active internal ringing Min Typ Max VBH + 6 Unit Note V 7 Current-Limit Behavior SLIC Mode 12 Condition Min Typ Max Unit Note 1 100 µA 6 Disconnect Applied fault between ground and T/R Tip Open Ring Short to GND 24 35 46 Standby Short Tip to VBH Short Ring to GND 20 20 38 35 47 44 Active Ringing ISLAC device generating internal ringing Am79R240 Data Sheet 100 mA 2 Thermal Shutdown Fault Indications Fault Indication No Fault IMT operates normally (VREF ±1 V) Thermal Shutdown KG, IMT above 2.8 V Note: 1. 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 2. Not tested or partially tested in production. This parameter is guaranteed by characterization or correlation to other tests. 3. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization. 4. When the Am79R240 device and ISLAC device is in the anti-sat operating region, this parameter is degraded. The exact degradation depends on system design. 5. –55 dBm gain tracking level not tested in production. This parameter is guaranteed by characterization and correlation to other tests. 6. This spec is valid from 0 V to VBL or –50 V, whichever is lower in magnitude. 7. Other ringing voltage characteristics are set by the ISLAC device. Operating Modes The Am79R240 device 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 Am79R240 device control register. When the LD pin is less than 0.3 V below VREF < (VREF - 0.3 V), P1–P3 must be low. When the LD pin is more than 0.3 V above VREF > (VREF + 0.3 V), P1–P3 must contain ISLIC device control data C1, C2, and C3, which are latched into the Am79R240 device control register. Connecting the LD pin to VREF locks the contents of the Am79R240 device control register. The operating mode of the Am79R240 device is determined by the C1, C2, and C3 bits in the control register of the Am79R240 device. The following table defines the Am79R240 device operating modes set by these signals. Table 1. Operating Modes Battery Voltage Selection Operating Mode Standby (See Note) High Battery (BATH) and BGND (High ohmic feed): Loop supervision active, A and B amplifiers shut down 1 Tip Open (See Note) High Battery (BATH) and BGND Tip Open: AD at High-Impedance, Channel A power amplifier shut down 1 0 On-Hook Transmission, Fixed Longitudinal Voltage High Battery (BATH) and BGND Fixed longitudinal voltage of –28 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 Active feed, normal or reverse polarity 1 1 0 Active Low Battery Low Battery (BATL) and BGND 1 1 1 Active Internal Ringing High Battery (BATH) and BGND C3 C2 C1 0 0 0 0 0 0 Operating Mode Active internal ringing Note: In these modes, the ring lead (B-lead) output has a –50 V internal clamp to battery ground (BGND). Am79R240 Data Sheet 13 Operating Mode Descriptions Operating Mode Description Disconnect 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 Am79R240 device 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 V SA V SB currents are scaled to produce voltages across RMTi and RLGi of ----------- and ----------- , respectively. 400 400 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 to approximately –50 V with respect to BGND. For VBH values above –55 V, the open-circuit voltage, which appears at this output is ~VBH + 7 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 “Current-Limit Behavior” on page 12. In external ringing, the standby ISLIC device 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. Active High Battery In the Active High Battery mode, battery connections are connected 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. Active Internal Ringing In the Internal Ringing mode, the Am79R240 device selects the battery connections as shown in Table 1. When using internal ringing, both the AD and BD output amplifiers deliver the ringing signal determined by the programmed ringing level. On-Hook Transmission (OHT), Fixed Longitudinal Voltage In the On-Hook Transmission, Fixed Longitudinal Voltage mode, battery connections are connected as shown in Table 1. The longitudinal voltage is fixed at the voltage (also in the table above) to allow compliance with safety specifications for some classes of products. Thermal-Management Equations Applies to all modes except Standby, which has no thermal management. IL < 5 mA PSLIC = (SBAT – IL(RL + 2RFUSE)) • IL + 0.3 W PTRTMG = 0 14 Am79R240 Data Sheet TIMING SPECIFICATIONS Symbol Signal Parameter Min Typ Max trSLD LD Rise time Am79R240 device LD pin 2 tfSLD LD Fall time Am79R240 device LD pin 2 tSLDPW LD LD minimum pulse width tSDXSU P1,P2,P3 P1–P3 data Setup time 4.5 tSDXHD P1,P2,P3 P1–P3 data hold time 4.5 3 Unit µs Note: 1. The P1–P3 pins are updated continuously during operation by the LD signal. 2. When writing to the ISLIC device registers, the sequence is: a) Set LD pin to mid-state b) Place appropriate data on the P1–P3 pins c) Assert the LD pin to High to write the proper data d) Return LD pin to mid-state 3. Am79R240 device registers are refreshed at 5.33 kHz when used with an ISLAC device. 4. If the clock or MPI becomes disabled, the LD pins and P1–P3 returns to 0 V state, thus protecting the Am79R240 device and the line connection. 5. Not tested in production. Guaranteed by characterization. Am79R240 Data Sheet 15 WAVEFORMS 187.5 µs LD * P1,P2,P3 S S S Write State Register VCC VREF LD Lock Registers 0V P1,P2,P3 Previous State Data New State Data State Data DETAIL A VREF LD Write State Register trSLD tfSLD tSLDPW tSDXHD tSDXSU P1,P2,P3 *Note: When the LD pin is less than 0.3 V below VREF, P1-P3 must be low. 16 Am79R240 Data Sheet APPLICATION CIRCUIT Internal Ringing +5 V 3.3 V VCC RSAi CREF SA RRXi VOUTi RSN DGND RHLai A RFAi AD VHLi RHLci U3 RTi RHLdi CHLdi AGND VREF CADi VCCA VSABi VSAB CHPi HPA VTX VINi IMT VIMTi HPB U4 B VCC +3.3VDC VCCD RFBi BD RSBi SB CBDi RMTi U1 Am79R240 U2 ISLAC VREF RSVD RSVD RSVD VILGi ILG BACK PLANE RLGi VREF DHi BATH VBH VREF VREF DLi BATL VBL LD CBATLi LDi GND CBATHi P1 RSVD RSVD RSVD RSVD RSVD P1 SLB BATL RSLB P2 P2 P3 P3 BATH SHB RSHB IREF RREF BGND RSVD ** Connections shown for one channel Am79R240 Data Sheet 17 LINE CARD PARTS LIST The following list defines the parts and part values required to meet target specification limits for channel i of the line card (i = 1, 2). Item Type Value Tol. Comments Am79R240 ISLIC device U2 Am79D22xx ISLAC device U3, U4 P0741SA DHi, DLi Diode TECCOR protector RFAi, RFBi Resistor 50 Ω 5% 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 RSHB, RSLB, RSPB Resistor 750 kΩ 1% 1/8 W RHLai Resistor 40.2 kΩ 1% 1/10 W RHLci Resistor 2.87 kΩ 1% 1/10 W RHLdi Resistor 2.87 kΩ 1% 1/10 W CHLdi Capacitor 0.82 µF 10% 10 V 1/8 W 100 mA 100 V 50 ns Fusible PTC protection resistors Sense resistors Current reference Ceramic RMTi Resistor 3.01 kΩ 1% RLGi Resistor 6.04 kΩ 1% 1/8 W CADi, CBDi Capacitor 22 nF 10% 100 V Ceramic, not voltage sensitive CBATHi, CBATLi Capacitor 100 nF 20% 100 V Ceramic CHPi Capacitor 22 nF 20% 100 V Ceramic CVC Capacitor 100 nF 20% 50 V Ceramic Note: 1. Value can be adjusted to suit application. 2. Can be looser for relaxed ring-trip requirements. 18 Rating U1 Am79R240 Data Sheet PHYSICAL DIMENSIONS PL 032 Dwg rev AH; 08/00 Am79R240 Data Sheet 19 REVISION HISTORY Revision B to C • • • • • • • • • • Applied new format. Added 5 REN statement and sub-bullets to “Distinctive Characteristics” Corrections to “Internal Ringing Application Circuit” Changed limits for On-Hook Standby, Power Dissipation Normal Polarity in “Power Dissipation” table. New value for VBL in “Electrical Ranges” table. Added VRING condition to row 1 in “DC Specifications” table. Also provided min values for row 3, and created rows 15 and 16. Added max value for row 4 in “Transmission Specifications” table. Also changed min and max for row 6. Supplied ringing voltage in “Ringing Specifications” table. Supplied max values in “Current-Limit Behavior” table. Imported correct graphics for “Physical Dimensions.” Revision C to D • • • • “Distinctive Characteristics changed to “Features.” 5 REN bullet changed from 9.2 to 9.55 kft and from 14.6 to 15.2 kft. Diameter information deleted from 5 REN bullet. “Environmental Ranges,” and “Chip Set Features” new temperature statement. Updated “Internal Ringing” Application Circuit for component “CBATLi” circuitry. “Waveforms,” new image. 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. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this publication. Except as set forth in Legerity's Standard Terms and Conditions of Sale, Legerity assumes no liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. Legerity's products are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to support or sustain life, or in any other application in which the failure of Legerity's product could create a situation where personal injury, death, or severe property or environmental damage may occur. Legerity reserves the right to discontinue or make changes to its products at any time without notice. © 2001 Legerity, Inc. All rights reserved. Trademarks Legerity, the Legerity logo and combinations thereof, and ISLIC, ISLAC, Intelligent Access, 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. Am79R240 Data Sheet 21 Americas Mailing: P.O. Box 18200 Austin, TX 78760-8200 Shipping: 4509 Freidrich Lane Austin, TX 78744-1812 ATLANTA 6465 East Johns Crossing, Suite 400 Duluth, GA USA 30097 MainLine: 770-814-4252 Fax: 770-814-4253 AUSTIN 4509 Freidrich Lane Austin, TX USA 78744-1812 MainLine: 512-228-5400 Fax: 512-228-5510 BOSTON 6 New England Executive Park Suite 400 Burlington, MA USA 01803 MainLine: 781-229-7320 Fax: 781-272-3706 CHICAGO 8770 W. Bryn Mawr, Suite 1300 Chicago, IL USA 60631 MainLine: 773-867-8034 Fax: 773-867-2910 DALLAS 4965 Preston Park Blvd., Suite 280 Plano, TX USA 75093 MainLine: 972-985-5474 Fax: 972-985-5475 HUNTSVILLE 600 Boulevard South, Suite 104 Huntsville, AL USA 35802 MainLine: 256-705-3504 Fax: 256-705-3505 IRVINE 1114 Pacifica Court, Suite 250 Irvine, CA USA 92618 MainLine: 949-753-2712 Fax: 949-753-2713 NEW JERSEY 3000 Atrium Way, Suite 270 Mt. Laurel, NJ USA 08054 MainLine: 856-273-6912 Fax: 856-273-6914 OTTAWA 600 Terry Fox Drive Ottawa, Ontario, Canada K26 4B6 MainLine: 613-599-2000 Fax: 613-599-2002 RALEIGH 2500 Regency Parkway, Suite 226 Cary, NC USA 27511 MainLine: 919-654-6843 Fax: 919-654-6781 SAN JOSE 1740 Technology Drive, Suite 290 San Jose, CA USA 95110 MainLine: 408-573-0650 Fax: 408-573-0402 Telephone: (512) 228-5400 Fax: (512) 228-5510 North America Toll Free: (800) 432-4009 Worldwide Sales Offices Asia Europe HONG KONG Units 2401-2, 24th Floor Jubilee Centre, 18 Fenwick Street Wanchai, Hong Kong MainLine: 852-2864-8300 Fax: 852-2866-1323 BELGIUM Baron Ruzettelaan 27 8310 Brugge Belgium MainLine: 32-50-28-88-10 Fax: 32-50-27-06-44 KOREA 135-090 18th Fl., Kyoung Am Bldg 157-26, Samsung-dong, Kangnam-ku Seoul, Korea MainLine: 82-2-565-5951 Fax: 82-2-565-3788 FRANCE 7, Avenue G. Pompidou Suite 402 92300 Levallois-Perret, France MainLine: 33-1-47-48-2206 Fax: 33-1-47-48-2568 SHANGHAI Shanghai P.O. Box 232022 Shanghai PR China 200232 MainLine: 86-21-54233253 Fax: 86-21-54233254 GERMANY Elisabethstrasse 89-91 80797 München, Germany MainLine: 49-89-5908-0 Fax: 49-89-5908-1308 SHENZHEN Room 310, Tower 9 Jinxiu Street 30 Futian District Shenzhen, PR China 518040 MainLine: 86-755-3706-667 Fax: 86-755-3706-520 ITALY Via F. Rosselli 3/2 20019 Settimo Mse, Milano Italy MainLine: 39-02-3355521 Fax: 39-02-33555232 SINGAPORE Serangoon Central Post Office P.O. Box 537 Singapore 915502 MainLine: 65-2803267 Fax: 65-2855869 TOKYO Shinjuku NS Bldg. 5F 2-4-1 Nishi Shinjuku, Shinjuku-ku Tokyo, Japan 163-0805 MainLine: 81-3-5339-2011 Fax: 81-3-5339-2012 SWEDEN Frösundaviks Allé 15, 4tr SE-16970 Solna Sweden MainLine: 46-8-509-045-45 Fax: 46-8-509-046-36 UK Regus House, Windmill Hill Business Park Whitehill Way SN5 6QR Swindon Wiltshire UK MainLine: 44-(0)1793-441408 Fax: 44-(0)1793-441608 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]