MT9125AP Datasheet

IC型號(hào)：
MT9125AP
PDF描述：
CMOS Dual ADPCM Transcoder
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302.53KB
PDF頁(yè)數(shù)：
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MITEL

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CMOS

MT9125

Dual ADPCM Transcoder

Preliminary Information

Features

鈥?/div>

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 碌-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

ISSUE 3

August 1993

Ordering Information

MT9125AE

MT9125AP

24 Pin Plastic DIP

28 Pin PLCC

-40 to +85擄C

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.

The 32 kbit/s ADPCM transcoding

algorithm utilized conforms to CCITT Recom-

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

The

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.

Applications

鈥?/div>

Pair gain

Voice mail systems

Wireless set base stations

C2o

BCLK

F0i

MCLK

ENS

ST-BUS

Converter

EN2

Timing

EN1

DSTo

ADPCMi

ADPCM

I/O

ADPCMo

ENA

Control Decode

Transcoder 1

PCM

I/O

DSTi

ENB1

ENB2

Transcoder 2

VDD

VSS

PWRDN

MS1 MS2

A/碌 FORMAT

MS3 MS4

Figure 1 - Functional Block Diagram

8-17

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