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MT9125AE

Dual ADPCM Transcoder

Zarlink Semiconductor Inc 

Preliminary Information

MT9125

MT8910

Lin+

Lin-

Lout+

Lout-

F0b

C4b

DSTo

DSTi

C4ib

FPob

FPb

System Frame pulse or

delayed frame pulse

from previous selection

MT8980

C & D Channel

Switch

1/2 bandwidth

unusable

VDD

MT9125

C2o

ENS

BCLK

F0i

EN1

MCLK

EN2

DSTi DSTo

ADPCMi

ADPCMo

ENA

DSTi

DSTo

ENB1

ENB2

MT9125

C2o

ENS

BCLK

F0i

EN1

MCLK

EN2

ADPCMi

ADPCMo

ENA

DSTi

DSTo

ENB1

ENB2

MT8980

B Channel Switch

FPib

DSTi DSTo C4ib

FPib

FPob

DSTo

DSTi

C4ib

1

FPib

FPob

DSTo

DSTi

C4ib

7

FPib

FPob

DSTo

DSTi

C4ib

8

Figure 10 - Application (ST-BUS Line Card)

MT89xx

T

Lout

F0b

C4b

R

Lin

DSTo

T

Lin

DSTi

R

Lout

The layer 1 device shown may be the 2-wire

MT8910 or MT8972 or the 4-wire MT8930.

VDD

MT9125

C2o

ENS

BCLK

F0i

EN1

MCLK

EN2

DSTi ADPCMi

DSTo ADPCMo

ENB1

ENB2

ENA

BIT CLOCK

ADPCM ENABLE

RFB1

RFB2

2 Channel RF Section

B1

B2

B3 B2 B1 B0 B3 B2 B1 B0

ADPCM nibbles concatenated into one 8

bit timeslot

B1

B2

B7 B6 B5 B4 B3 B2 B1 B0 B7 B6 B5 B4 B3 B2 B1 B0

B1

B2

B3 B2 B1 B0 X X X X B3 B2 B1 B0 X X X X

Normal ST-BUS channel assignment

In ADPCM by-pass mode (MS pin control)

the ADPCM nibbles are automatically

inserted into the most significant nibbles

of the 8-bit DSTi/o B1 and B2 bytes.

ENB1 (and ENA)

ENB2

Figure 11 - Application (2-Channel, Wireless-set, Base Station)

8-83

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