T7570-ML2-TR View Datasheet(PDF) - Agere -> LSI Corporation

Part Name

Description

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T7570-ML2-TR

Programmable PCM codec with hybrid-balance filter.

Agere -> LSI Corporation 

Data Sheet

October 1996

T7570 Programmable PCM Codec

with Hybrid-Balance Filter

Features

s Programmable internal hybrid-balance network

s Programmable transmit gain

— 19.4 dB range, 0.1 dB step size

s Programmable receive gain

— 19.4 dB range, 0.1 dB step size

s Dual-programmable PCM interface

— Up to 64 time slots per frame

— Variable data rate (64 kHz to 4.096 MHz)

— Two timing modes

s Programmable µ-law or A-law companding

s 300 Ω drive receive amplifier

s Analog and digital loopbacks

s On-chip sample-and-hold, autozero, and precision

voltage reference

s Single 5 V power supply

s Latch-up free, low-power CMOS technology

— 70 mW typical operating power dissipation

— 1.5 mW typical standby power dissipation

s Serial microprocessor-control interface

s 6-pin parallel I/O latch

s TTL- and CMOS-compatible digital I/O

s Meets or exceeds D3/D4 (as per Lucent PUB

43801), ITU-T (formerly CCITT) G.711—G.714,

and LSSGR requirements

s Operating temperature range: –40 °C to +85 °C

Description

The Lucent Technologies Microelectronics Group

T7570 Programmable PCM Codec with Hybrid-Bal-

ance Filter is a programmable PCM codec with an

internal hybrid-balance network filter. It provides ana-

log-to-digital and digital-to-analog conversion, as well

as the transmit and receive filtering necessary to

interface a voice telephone circuit to a time-division

multiplexed (TDM) system. Programmable features

include transmit gain setting over a 19.4 dB range

and receive gain setting over a 19.4 dB range. An

internal filter can be programmed to provide hybrid

balancing over a wide range of loop impedances for

both active and transformer subscriber line interface

circuits (SLIC).

The device is programmed over a low pin-count,

standard, serial, microprocessor-control interface. A

6-pin parallel input/output latch is provided to control

interface circuits. Each of these pins can be individu-

ally programmed to be an input or an output.

The T7570 is fabricated by using a low-power CMOS

technology, requires a single 5 V supply, and is avail-

able in a 28-pin PLCC package for surface mounting.

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