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AM79231, AM79231-1JC, AM79231JC

Table of contents:
Info of AM79231
Info of AM79231-1JC
Info of AM79231JC

AM79231, AM79231-1JC, AM79231JC Selling Leads, Datasheet

MFG:AMD Package Cooled:PLCC32 D/C:06+

AM79231, AM79231-1JC, AM79231JC Datasheet download

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Part Number: AM79231

MFG: AMD

Package Cooled: PLCC32

D/C: 06+

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AM79231 General Description

The Intelligent Access™ 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 WinSLAC™ software. This PC software is provided free of charge. It allows the designer enter a description of system equirements. 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 Maximum Ratings

Storage temperature	55 to +150
Ambient temperature, under bias	40 to +85
Humidity	TBD
VCC with respect to GND	0.4 to +7 V
VBH, VBL with respect to GND²	+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 TA = 85	1.67 W
Notes: 1. Thermal limiting circuitry on chip will shut down the circuit at a junction temperature of about 165. The device should never see this temperature. Operation above 145 junction temperature may degrade device reliability. 2. Rise time of VBH (dv/dt) must be limited to less than 27 v/µs.

AM79231 Connection Diagram

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