AM79Q4457J ETC1 [List of Unclassifed Manufacturers], AM79Q4457J Datasheet

AM79Q4457J

Manufacturer Part Number

AM79Q4457J

Description

Quad Subscriber Line Audio Processing Circuit-Non-Programmable (QSLAC-NP) Devices

Manufacturer

ETC1 [List of Unclassifed Manufacturers]

Datasheet

1.AM79Q4457J.pdf (44 pages)

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Am79Q4457/5457

Quad Subscriber Line Audio Processing Circuit-

Non-Programmable (QSLAC

DISTINCTIVE CHARACTERISTICS

GENERAL DESCRIPTION

The Am79Q4457/5457 Quad Subscriber Line Audio

Processing Circuit-Non-Programmable (QSLAC-NP)

device integrates the key functions of analog linecards

into a high-performance, four-channel Codec/Filter

device. The QSLAC-NP devices are based on the

proven design of the reliable Am79C02/03/031(A)

Dual Sub scr ibe r Line Aud io-Processing Circu it

(DSLAC

Subscriber Line Audio-Processing Circuit (ASLAC

device. The advanced architecture of the QSLAC-NP

devices implements four independent channels in a

single integrated circuit, providing a cost-effective

solution for the audio-processing function of Plain Old

Telephone Service (POTS) linecards.

The Am79Q4457/5457 QSLAC-NP device provides

four industry-standard Codec/Filter devices in a single

integrated circuit. The Am79Q4457/5457 device

provides a transmit and receive frame synchronization

input per channel. A-law or µ-law compression is

selected via a device pin.

Although the name and logo have changed, the data contained herein

remains the same as the most recent AMD revision of this document.

Performs the function of four Codec/Filters

A-law or µ-law coding

Single PCM port

— Up to 4.096 MHz operation (64 channels)

Hardware programmable (via external

components)

— Transhybrid balance impedance

— Transmit and receive gains

™

) devices, and the Am79C202 Advanced

™

-NP) Devices

™

)

In addition, the Am79Q4457 device provides the ability

to select one of three independent gain settings (both

transmit and receive) and one of two balance networks

on a per-channel basis. The transmit and receive gain

leve ls ar e set once fo r th e device via exte r na l

components. Gain level selection and the balance

network selection is achieved through an integrated

serial shift register and latch per channel.

The Am79Q5457 device provides four industr y-

standard Codec/Filter devices in a 32-pin PLCC or 44-

pin TQFP package. The Am79Q4457 device provides

four industr y-standard Codec/Filter devices and

selectable gain and balance functions in a 44-pin PLCC

or 44-pin TQFP package.

Advanced submicron CMOS technology enables the

Am79Q4457/5457 QSLAC-NP device to have both

the functionality and the low power consumption

required in linecard designs, maximizing linecard

density at a minimum cost. When used with four

Legerity SLICs, a QSLAC-NP device provides a

complete solution to the BORSCHT function of a

POTS linecard.

Additional Am79Q4457 device capabilities

(per channel, set external)

— Three selectable transmit gains

— Three selectable receive gains

— Two selectable balance networks

— Simple serial control interface

Separate PCM and Master clocks

1.536 MHz, 1.544 MHz, 2.048 MHz, or 4.096 MHz

master clock options

— Internal timing automatically adjusted based on

Low power 5.0 V CMOS technology

5.0 V only operation

MCLK and frame sync signal

Publication# 20031

Issue Date: January 2000

Rev: D Amendment: /0

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