KX-TDA6381X, KX-TDA6381SX - Panasonic PBX Service Manual (repair manual). Page 14

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This converts 4W-voice signal inside PBX and 2W-voice signal on trunk line. It is configured by Op-Amp and BN (Balance Net-
work) in CODEC. It determines the return loss of voice and the frequency characteristic, and it can match with all sorts of imped-
ance by changing the parameters of CODEC.

A dedicated interface, which can connect up to 4 PEB2466, for enabling circuit controls.

VIN[0]

DIAL[0]

VOUT[0]

CPCDET[0]

SHNT[0]

VH1

+15V

DG

+5V

AG

+5V

AG

R

20A

PC5A

1

2

4

R32A

T1A

2

1

3

4

C10A

C11A

C12A

C16A

C8A

C9A

IC1A

1

2

3

4

8

R21A

R22A

R24A

R27A

R

30A

R

34A

R35A

DA1A

1

2

3

C7A

IC1A

5

6

7

R23A

CODEC

B/N in
CODEC

Serial
Communications

Serial
Communications

S/P
conversion

Command Register

Transmit Register (FIFO)

Receive Register

MPR

DCLK

CS#1

4ch CODEC-1

Din
Dout

DCLK

CS

4ch CODEC-4

Din
Dout

DCLK

CS

CS#2
CS#3
CS#4

Timing
Control Circuit

P/S
conversion

Transmit Start bit

CODEC Selected Register

Mode Selected Register
(byte/burst)

Status Register 

Status Register 

ASIC