Daewoo CP-385, Service Manual

Page: 26 / 92

Service manual CP 385 / CP785
- 25 -
Pin No. Pin Name Type Short description
56 AVSS Analog ground
57 AVSUP Analog power supply
58 In IF input 1
59 ANA_IN1- In IF common
60 NC Not Connected
61 TESTEN In Test pin
62 XTAL_IN In Crystal oscillator
63 XTAL_OUT Out Crystal oscillator
64 NC Test pin
4-3 TDA894xJ Stereo Audio Amplifier
The TDA 8944J ( TDA 8946J ) is a dual-channel audio power amplifier with an output power of 2 x 7
W ( 2 x 15 W ) at an 8
W
load and a 12 V supply. The circuit contains two Bridges Tied Load (BTL)
amplifiers with an all-NPN output stage and standby/mute logic. The TDA8944J comes in a 17-pin DIL
power package.
Features
Few external components
Fixed gain
Standby and mute mode
No on/off switching plops
low standby current
High supply voltage ripple rejection
Outputs short-circuit protected to ground, supply and across the load
Thermally protected
Pin description
Pin Symbol Description
1 OUT1- negative loudspeaker terminal 1
2 GND1 ground channel 1
3 Vcc1 supply voltage channel 1
4 OUT1+ positive loudspeaker terminal 1
5 n.c. not connected
6 IN1+ positive input1
7 n.c. not connected
8 IN1- negative input1
9 IN2- negative input2
10 MODE mode selection input
11 SVR half supply voltage decoupling
(ripple rejection)
12 IN2+ positive input2