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Appendix
59
ANA_IN1-
60
NC
61
TESTEN
62
XTAL_IN
63
XTAL_OUT
64
NC
1-3 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
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
1
OUT1-
2
GND1
3
Vcc1
4
OUT1+
5
n.c.
6
IN1+
7
n.c.
8
IN1-
9
IN2-
10
MODE
11
SVR
12
IN2+
In
In
In
Out
load and a 12 V supply. The circuit contains two Bridges Tied Load (BTL)
Description
negative loudspeaker terminal 1
ground channel 1
supply voltage channel 1
positive loudspeaker terminal 1
not connected
positive input1
not connected
negative input1
negative input2
mode selection input
half supply voltage decoupling
(ripple rejection)
positive input2
IF common
Not Connected
Test pin
Crystal oscillator
Crystal oscillator
Test pin
- 13 -
Service manual WP-795
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