Intelligent Access™ Voice Solutions Am79R241 Intelligent Subscriber Line Interface Circuit (ISLIC™) DISTINCTIVE CHARACTERISTICS Monitor of two-wire interface voltages and currents supports — Voice transmission — Through chip ring generation Supports internal short loop and external ringing +5 V and battery supplies Dual battery operation for system power saving — Automatic battery switching — Programmable DC feed characteristics — Independent of battery — Current limited — Selectable off-hook and ground-key thresholds — Subscriber line diagnostics — Leakage resistance — Intelligent thermal management Compatible with inexpensive protection networks — Accommodates low tolerance fuse resistors or PTC thermistors Metering capable — Loop resistance — 12 kHz and 16 kHz — Line capacitance — Smooth polarity reversal — Bell capacitance — Foreign voltage sensing Tip-open state supports ground start signaling Integrated test load switches/relay drivers — Power cross and fault detection BLOCK DIAGRAM RSN S ig n a l T ra n s m is s io n AD V TX SA HPA HPB T w o-W ire In te rfa c e Lo n g itu din a l C o n trol G a in /L ev e l S h ift V LB SB BD A tte n u a to r VSAB V RE F TM N TM P S ig na l C o n ditio n in g T h e rm a l M anagem ent C o n tro l TM S Fault Meas IM T IL G CREF VBL S w itc h D riv e r VBH R e la y C on tro l R2 R3 RYE R e la y D riv e rs P1 In p u t D e c o d er a n d C o n tro l R e g is te rs P2 P3 LD R1 R ela y D riv e r 1 B G ND GND VCC Publication# 080249 Rev: I Issue Date: August 2000 Amendment: /0 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 Am79R241 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Linecard Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Target Specifications (See note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Relay Driver Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Am79R241 Transmission Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Am79R241 Ringing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Am79R241 Current-Limit Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Am79R241 Fault Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Timing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Revision Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2 Am79R241 Datasheet The Am79R241, 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 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 Performs all battery feed, ringing, 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: — Ringing waveform and frequency — DC loop-feed characteristics and current-limit — Off-hook debounce circuit — Ground-key and ring-trip filters — Off-hook detect de-bounce interval — Transhybrid balance — Transmit and receive gains — Equalization — Digital I/O pins — A-law/µ-law and linear selection Supports internal and external battery-backed ringing — Self-contained ringing generation and control — Two-wire AC impedance — Loop-supervision detection thresholds Exceeds LSSGR and CCITT 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 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 — Supports external ringing generator and ring relay — Leakage — Ring relay operation synchronized to zero crossings of ringing voltage and current — Loop resistance — 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 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 Am79R241 Datasheet 3 BLOCK DIAGRAMS Figure 1. Example Four-Channel Linecard Block Diagram 4 7 A1 A m 7 9R 24 1 VCCD LD1 B1 DGND1 VREF A2 B2 A3 DGND2 7 RC Networks and Protection VCCA A m 7 9R 24 1 LD2 4 IO1-IO4 AGND1 TSCA/G AGND2 7 A m 7 9R 24 1 B3 3 A4 LD3 TSCB P1-P3 DRA/DD 7 A m 7 9R 24 1 LD4 B4 RREF Quad ISLAC Am79Q2243 DRB DXB DXA/DU DCLK/S0 PCLK/FS RSHB BATH MCLK FS/DCL RSLB BATL CS/RST DIO/S1 INT 4 Am79R241 Datasheet Figure 2. Am79R241 Block Diagram IA sense AD IA RSN IA 600 SA A Amplifier + - Fault Meas. + HPA - + TMS VTX VREF BGND + HPB Fault Meas. + + β = 0.01 - SB VREF B Amplifier IB VSAB IB sense BD VREF IB 600 TMN TMP VREF Thermal Management Control Gain/Level Shift To Power Amplifiers Thermal Shutdown VBH IMT IA IB − 600 600 ILG Disconnect Active Low Battery Internal Ringing Standby IA IB + 600 600 Decoder R2 RD1 RD2 R1 BGND OHT Fixed Longitudinal Voltage Active High Battery RYE Reserved VBL Tip Open High Neg Batt Sel R3 VLB RD3 C1 C2 Control Register CREF C3 Demux Power amplifiers positive supply P1 P2 P3 Am79R241 Datasheet 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. Am79R241 J C TEMPERATURE RANGE C= Commercial (0°C to +70°C)* PACKAGE TYPE J = 32-pin plastic leaded chip carrier (PL032) DEVICE NAME/DESCRIPTION Am79R241 Intelligent Subscriber Line Interface Circuit Valid Combinations Valid Combinations Am79R241 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 Am79R241 Datasheet BGND 2 1 32 31 30 AD VCC 3 RSVD VBH 4 BD VBL CONNECTION DIAGRAM R1 5 29 SB R2 6 28 SA RYE 7 27 IMT R3 8 26 ILG 25 CREF Am79R241 32-Pin PLCC TMS 9 TMP 10 24 RSVD TMN 11 23 HPB P1 12 22 HPA P2 13 21 VTX Am79R241 Datasheet 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. Analog and digital ground return for VCC. 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 Am79R241 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 Am79R241 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 Am79R241 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 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. 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 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. It is the reference for the longitudinal control loop. When the VLB pin is greater than VREF, the Am79R241 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. Positive supply for low voltage analog and digital circuits in the Am79R241. VREF 1.4 V Analog Reference I The ISLAC chip provides this voltage which is used by the Am79R241 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. Am79R241 Datasheet GENERAL DESCRIPTION The Intelligent Accessä voice chipsets integrate all functions of the subscriber line. Two chip types are used to implement the linecard; an Am79R241 device and an ISLAC device. These provide the following basic functions: 1. The 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. 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 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 is designed to be used exclusively with the ISLAC devices. The Am79R241 requires only +5 V power and the battery supplies for its operation. The 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 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 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 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 Am79R241 Datasheet 9 Subscriber line matching Ringing generation 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 — Internal ringing signal — 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 (P1-P3) 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 Am79R241 Datasheet INTELLIGENT ACCESS™ VOICE CHIPSETS LINECARD WITH Am79R241 Figure 3. Internal Ringing Linecard Schematic +5 V VCC RSAi 3.3 V CREF SA RRXi VOUTi RSN DGND RHLai A RFAi RHLbi CHLbi AD VHLi RHLci U3 D1 RTi RHLdi CHLdi AGND VREF CADi VCCA VSAB CHPi BATH VSABi VCC +3.3VDC VCCD HPA CS DT1i VTX VINi VLB VLBi IMT VIMTi HPB D2 U4 CSSi B RFBi BD RSBi SB CBDi TMS RTEST RMTi U1 Am79R241 VREF RMGPi VILGi ILG DT2i*** U2 ISLAC BACK PLANE TMP RLGi TMN VREF RMGLi DHi BATH VREF VBH VREF DLi BATL VBL LD LDi SPB P1 SLB GND CBATHi CBATLi P1 RSVD P2 P2 P3 P3 BATL RSLB BATH SHB RSHB RYE IREF R2 RREF R3 * CSS required for > 2.2 Vrms metering ** Connections shown for one channel *** DT2i diode is optional - should be connected if there is a chance that this chip may be replaced by the Am79R251 device. Otherwise, it creates a short. R1 BGND RSVD Am79R241 Datasheet 11 Figure 4. External Ringing Linecard Schematic RSAi +5 V 3.3 V VCC SA CREF RRXi VOUTi RSN RHLai A RFAi 1 8 RHLbi CHLbi AD DGND KRi(A) AGND VHLi RHLci CADi 6 7 RTi U5 RHLdi CHLdi VREF VCCA VSABi VSAB 2 BATH DT1i CHPi HPA 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 RTES 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 IREF R2H RREF R3H R1 RGFDLi KRi +5 V Ring Bus BGND RSVD * CSS required for > 2.2 Vrms metering ** Connections shown for one channel *** DT2i is optional - Should be present if there is a chance that this chip may be replaced by the Am79R251 device. Otherwise, it creates a short. RSRBi RSRC 12 BATH RSHB RYE Am79R241 Datasheet XSBi XSC 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 Am79R241 U2 Am79X22xx U3, U4 B1100CC U5 TISP61089A D1, D2 Value Tol. Rating ISLIC device ISLAC device 100 V TECCOR Battrax protector Transient Voltage Suppresser, Power Innovations Diode 1A 100 V DHi, DLi, DT1i, DT2i Diode 100 mA 100 V 4 Comments 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 50 ns Fusible PTC protection resistors Sense resistors Current reference Thermal management 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 Ceramic CHLdi Capacitor 0.82 µF 10 % 10 V RMTi Resistor 3.01 kΩ 1% 1/8 W RLGi Resistor 6.04 kΩ 1% 1/8 W RTEST Resistor 2 kΩ 1% 1W 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 Capacitor 56 pF 5% 100 V Ceramic 1.2 W typ CADi, CBDi 1 3 CSSi Test board Ceramic, not voltage sensitive Components for External Ringing RGFDi Resistor 510 Ω 2% 2W RSRBi, RSRc Resistor 750 kΩ 2% 1/4 W KRi Relay 5 V Coil 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. Am79R241 Datasheet 13 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 = –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 V RMGL = RMGP (Thermal management resistors) = 1 kΩ Description Power Dissipation Normal Polarity Test Conditions Max 55 70 On-Hook Standby 80 100 On-Hook Transmission Fixed Longitudinal Voltage ISLIC 175 215 On-Hook Active High Battery ISLIC 340 400 Off-Hook Active Low Battery RL = 294 Ω ISLIC TMG 700 200 800 VBH VBL VCC 0.4 0.1 3.0 0.7 VBH VBL VCC 0.75 0 3.1 1.1 VBH VBL VCC 1.85 0 5 2.5 VBH VBL VCC 3.6 0 7.3 4.5 VBH VBL VCC 0.9 26.9 7.5 2.0 On-Hook Standby On-Hook Transmission Fixed Longitudinal Voltage On-Hook Active High Battery Off-Hook Active Low Battery RL = 294 Ω 14 Typ On-Hook Disconnect On-Hook Disconnect Power Supply Currents Min Am79R241 Datasheet Unit mW 3.5 3.5 mA 6 8.0 10 Thermal Resistance The junction to air thermal resistance of the Am79R241 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 VCC with respect to GND –0.4 to +7 V VBH, VBL with respect to GND2 +0.4 to –104 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 –40 to +85 °C extended temperature Ambient Relative Humidity 15 to 85% Electrical Maximum Ranges VCC VBL VBH BGND with respect to GND Load resistance on VTX to Vref Load resistance on VSAB to Vref Note: Vloopmax: Vpk: 5 V ± 5% –(Vloopmax + 6 V + Vpk) to VBH V –42.5 V to –99 V –100 mV to +100 mV 20 kΩ minimum 20 kΩ minimum Maximum expected loop voltage in application; ILOOP • off-hook loop resistance. Peak signal voltage for application. Am79R241 Datasheet 15 SPECIFICATIONS Target Specifications (See note 1) No. 1 Item Condition Two-wire loop voltage (including offset) 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 = 2200 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 Mid 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 6 VTX output offset 7 VREF input current VREF = 1.4 V 8 CREF input current CREF = 3.3 V 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, KLG 12 VLB pin input current Voltage Output on IMT Min VBH – 8 48 13.88 Typ VBH–7 51 15 Max Unit Note V 3 3 VBH–6 55.5 16.13 19.8 22 130 250 375 Ω 34 45 mA 44.6 56 µA 36 43 0.6 VREF+0.3 VREF–0.3 CREF – 1 108 47 51 2.0 -20 -20 0 0 0.8 20 20 –50 0 +50 50 V V V µA µA µA V V µA µA mV µA 3 -3 0 3 µA 3 0.0088 0.0097 0.0106 V/V TBD CREF – 0.3 V CREF V 30 VLB = VREF ± 1 V 0 100 µA ILOOP/IMT ILOOP = 10 mA 275 300 325 A/A 14 ILONG/ILG ILONG = 10 mA 565 605 645 A/A 15 Input current, SA and SB pins Active modes 1.0 3.0 µA 16 K1 Incremental DC current gain 462.5 500 537.5 17 ISA/IMT Disconnect ISA = 2 mA 4 6 8.75 18 ISB/ILG Disconnect ISB = 2 mA 19 VSAB output offset 20 IMT output offset –3 21 ILG output offset –1 3 3 3 A/A 10 12 16 TBD TBD TBD mV 0 3 µA 0 1 µA Am79R241 Datasheet 3 V/V 13 16 — — — 3 3 3 Relay Driver Specifications Item On Voltage Condition Min 25 mA/relay sink Typ Max 0.4 0.5 Unit Note V Figure 5. 40 mA/relay sink 0.8 1.0 R2,R3 Off Leakage R2,R3 = BGND RYE = VBH 0 100 Zener Break Over Iz = 100 µA 6.6 7.9 10 V Zener On Voltage Iz = 30 mA 6 11 17 V µA Relay Driver Configuration R2 R3 RYE BGND BGND Figure 5A. Relay 1 Driver R1 BGND Am79R241 Datasheet 17 Am79R241 Transmission Specifications No. Item Condition Min 1 RSN input impedance 2 VTX output impedance f = 300 to 3400 Hz 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 TA = –40°C to 85°C –14.13 –14.18 6 2-4 wire gain variation with frequency 300 to 3400 Hz, relative to 1 kHz TA = –40°C to 85°C 7 2-4 wire gain tracking +3 dBm to –55 dBm Reference: –10 dBm TA = –40 to 85°C Max 1 Unit Ω 3 70 Note 3 mA Ω 70 135 –13.98 –13.98 –13.83 –13.78 — 3 –0.1 –0.15 +0.1 +0.15 — 3 –0.1 +0.1 3,6 –0.15 +0.15 dB 8 4-2 wire gain –10 dBm, 1 kHz TA = –40°C to 85°C –0.15 –0.2 +0.15 +0.2 — 3 9 4-2 wire gain variation with frequency 300 to 3400 Hz, relative to 1 kHz –0.1 +0.1 — 1 10 4-2 wire gain tracking +3 dBm to –55 dBm Reference: –10 dBm –40°C to 85°C –0.1 –0.15 +0.1 +0.15 3, 6 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 OHT VAB - 50 V 0 dBm Idle channel noise C-message Active modes, RL = 600 Ω 2-wire TA = –40 to 85°C 4-wire 2-wire TA = –40 to 85°C 4-wire 4-wire 11B 12 Psophometric Weighted 13 Longitudinal balance (IEEE method) Normal Polarity +7 TBD –7 –83 TBD –97 L-T 200 to 1000 Hz TA = –40°C to 85°C 1000 to 3400 Hz TA = –40°C to 85°C 58 53 53 48 T-L 40 200 to 3400 Hz –50 –40 –48 –38 dB dB dB dB Vp — — — — 3 +11 dBrnC –79 dBmp — 3 — — 3 — ±1 L - T, IL = 0 50 to 3400 Hz 18 Typ — 3 — 3 63 4 Reverse Polarity L-T 200 to 1000 Hz TA = –40°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 Am79R241 Datasheet dB — 3 mArms 3 dB 3 Am79R241 Ringing Specifications Item Peak Ringing Voltage Condition Min Typ Active Internal Ringing VBH+3 Max Unit Note GND–3 V 8 Am79R241 Current-Limit Behavior SLIC Mode Disconnect Condition Min Applied fault between ground and T/R VBH applied to Tip or Ring Typ Max Unit Note 1 VBH/200K 100 µA A 7 Tip Open Ring Short to GND 24 35 46 Standby Short Tip-to-VBH Short Ring-to-GND 24 26 38 35 47 44 Active Ringing ISLAC generating internal ringing mA 100 3 Am79R241 Fault Indications Fault Indication Unit No Fault IMT operates normally (Vref ±1V) Thermal Shutdown IMT above 2.8 V Note Notes: 1. Unless otherwise specified, test conditions are: VCC = 5 V, RMG1 = RMG2 = 1 kΩ, BATH = –90 V, BATL = –36 V, RRX = 150 kΩ, RL = 600 Ω, RSA = RSB = 200 kΩ, RFA = RFB = 50 Ω, CHP = 22 nF, CAD = CBD = 22 nF, IRSN = 50 µA, Active low battery. DC-feed conditions are normally set by the ISLAC device. When the Am79R241 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 Am79R241 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. 8. Other ringing-voltage characteristics are set by the ISLAC device. Am79R241 Datasheet 19 Operating Modes The Am79R241 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 Am79R241 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 Am79R241 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 Am79R241 control register. Connecting the LD pin to VREF locks the contents of the Am79R241 control register. The operating mode of the Am79R241 is determined by the C1, C2, and C3 bits in the control register of the Am79R241. Table 1 defines the Am79R241 operating modes set by these signals. Under normal operating conditions, the ISLIC device does not have active relays. The Am79R241 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 Am79R241 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 Am79R241 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 –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 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 A and B Amplifier Output Active feed, normal or reverse polarity Active internal ringing Note: 1. In these modes, the ring lead (B-lead) output has a –50 V internal clamp to battery ground (BGND). 20 Am79R241 Datasheet 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 Am79R241 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 open-circuit 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 “Am79241 Current-Limit 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 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 Am79R241 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 –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 Am79R241. These signals usually perform the following functions. Am79R241 Datasheet 21 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 when external ringing is selected. 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 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 Am79R241 side of the protection resistor to avoid damage to the R2 driver. 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 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 Am79R241 side of the protection resistor to avoid damage to the R3 driver. Thermal-Management Equations (All Modes except Standby) IL < 5 mA 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 Am79R241. PSLIC = (SBAT – ILRL) • IL + 0.3 W PTMG = 0 IL > 5 mA PSLIC = (SBAT – IL(R L + 2 • R FUSE))*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 trSLD LD Rise time Am79R241 LD pin tfSLD LD Fall time Am79R241 LD pin 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 Typ Max Unit 2 2 3 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 Am79R241 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. Am79R241 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 Am79R241 and the line connection. 6. Not tested in production. Guaranteed by characterization. 22 Am79R241 Datasheet 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 Am79R241 Datasheet 23 PHYSICAL DIMENSIONS .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 H to Revision I • Page 11, Figure 3, DT1i was added and the last note was modified. • Page 12, Figure 4, DT1i was added and the last note was modified. • Page 15, Electrical Characteristics, Numbers changed in the Max column. • Page 16, Absolute Maximum Ratings, The "Humidity" row was deleted. • Page 17, Specifications, There were changes to rows one, four, six, 12, and 17–21, and to the Note column. • Page 18, Relay Driver Specifications, There were changes in the last two rows. • Page 19, Transmission Specifications, There were changes to rows, six, eight, 10, and 13, and to the Note column. • Page 20, Fault Indications, "ILG operates normally" was deleted from the Indication column on the second row. 24 Am79R241 Datasheet 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. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this publication. 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