T8532 datasheet(4/50 Pages) AGERE

4 / 50 page

Agere Systems Inc.

Preliminary Data Sheet

September 2001

Codec Chip Set

T8531A/T8532 Multichannel Programmable

General Description (continued)

T8532 Description

The T8532 block diagram is shown in Figure 2. Each of its eight channels consists of an antialias filter, sigma-delta

A/D and D/A converters, reconstruction and smoothing filters, termination impedance synthesis, and selectable

gain. The digital oversampled data is multiplexed onto a serial data port designed to interface with the T8531A

Another serial interface accepts control data from the T8531A for activating the various gain settings, self-test, and

powerdown modes. This chip also contains a precision voltage reference.

5-3794.b (F)

Figure 2. Block Diagram of T8532 Octal Converter

5-3796.d (F)

* Antialiasing filter.

Figure 3. Block Diagram of One T8532 Analog Channel

8-CHANNEL

A/D D/A

ANALOG HYBRID

TERMINATION

VOLTAGE

REFERENCE

OVERSAMPLED

DATA

INTERFACE

CONTROL

INTERFACE

VTX[7:0]

VRTX[7:0]

VRP[7:0]

VRN[7:0]

VDDA

VSSA

VDD

VSS

OSDX[1:0]

OSDR[1:0]

OSCK

OSFS

CDO

CDI

CCS

RSTB

GAIN

AAF*

∑-∆

A/D

GAIN

SUM

GAIN

V REFERENCES

RECEIVE

FILTER

D/A

VTX

VRP

VRN

1.024 MHz

VRTX

DIGITAL LOOPBACK

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