Hitachi CL2554AN, Service Manual, Page: 26 / 72

Service manual CL2554AN / CL2854AN
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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