MT9125AE Zarlink Semiconductor, MT9125AE Datasheet

MT9125AE

Manufacturer Part Number

MT9125AE

Description

MT9125 - Dual Adpcm Transcoder

Manufacturer

Zarlink Semiconductor

Datasheet

1.MT9125AE.pdf (17 pages)

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Features

•

Applications

•

Dual channel full duplex transcoder

32 kbit/s and 24 kbit/s ADPCM coding,

compatible to G.721 & and G.723 (1988) and

ANSI T1.303-1989

Low power operation, total 25mW typical

Asynchronous 4.096 MHz master clock

operation

Transparent ADPCM bypass capability

Serial interface for both PCM and ADPCM data

streams

ST-BUS interface supported

Pin selected -law or A-law operation

Pin selected CCITT or sign-magnitude PCM

coding

Single 5 volt power supply

Optional reset value (CCITT Table 3/G.721)

capability

Pair gain

Voice mail systems

Wireless set base stations

ADPCMo

ADPCMi

MCLK

BCLK

ENS

ENA

C2o

F0i

VDD

ADPCM

I/O

VSS

PWRDN

Converter

ST-BUS

Timing

Transcoder 1

Transcoder 2

Figure 1 - Functional Block Diagram

PCM

I/O

Description

The Dual-channel ADPCM transcoder is a low

power, CMOS device capable of two encoder

functions and two decoder functions. Two 64 kbit/s

PCM channels are compressed into two 32 kbit/s

ADPCM channels, and two 32 kbit/s ADPCM

channels are expanded into two 64 kbit/s PCM

channels.

algorithm utilized conforms to CCITT Recom-

mendation G.721 and ANSI T1.303-1989.

device also supports a 24 kbit/s (three bit word)

algorithm (CCITT/G.723).

Switching, on-the-ﬂy, between 32 kbit/s and 24 kbit/

s, is possible by toggling the appropriate Mode

Select (MS1-MS4) control pins.

MS1 MS2

MT9125AE

MT9125AP

The 32 kbit/s ADPCM transcoding

Control Decode

Dual ADPCM Transcoder

Ordering Information

-40 to +85 C

FORMAT

Preliminary Information

24 Pin Plastic DIP (600 mil)

28 Pin PLCC

ISSUE 3

CMOS

MS3 MS4

MT9125

August 1993

EN1

EN2

DSTo

DSTi

ENB1

ENB2

The

8-73

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