T8531 datasheet(1/48 Pages) AGERE

Part #	T8531

Description	T8502 and T8503 Dual PCM Codecs with Filters

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Manufacturer	AGERE [Agere Systems]

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Preliminary Data Sheet

November 2000

T8531/T8532 Multichannel Programmable

Codec Chip Set

Features

s

Single 5 V power supply operation

s

Per-channel programmable transmit gain

— 25.6 dB range, better than 0.01 dB steps

s

Per-channel programmable receive gain

— 17.8 dB range, better than 0.01 dB steps

s

Per-channel programmable hybrid balance

s

Programmable termination impedances

s

Programmable

µ-law, A-law, or linear PCM output

s

DTMF generator

s

DTMF receiver

s

Caller ID generator

s

Call progress tones generator

s

Automatic gain calibration

s

Programmable time-slot assignment with bit offset

s

Low-noise, balanced, receive SLIC interface

s

Few or no SLIC/codec interface components

required

s

Analog and digital loopbacks

s

Sigma-delta converters with dither noise reduction

s

Serial microcontroller control interface

s

Available in 64-pin MQFP and TQFP packages

General Description

The Multichannel Programmable Codec Chip Set is

comprised of the T8531 16-channel line card signal

processor and one or two custom T8532 octal A/D

and D/A converters. A ROM-coded tone plant is

included on the signal processor. Together these

devices achieve a highly integrated and highly pro-

grammable multichannel voice codec solution.

Software is provided to compute the gain and filter

coefficients required to program the codec.

5-3793F (F)

Figure 1. System Block Diagram

T8532

OCTAL

A/D

D/A

T8532

OCTAL

A/D

D/A

T8531

DIGITAL

SIGNAL

PROCESSOR

VTX (8)

VRP (8)

VRN (8)

VTX (8)

VRP (8)

VRN (8)

2

3

2

3

CK16

VRTX (8)

PCM

INTERFACE

MICROPROCESSOR

INTERFACE

ASIC

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