ViewSonic VX800-3 Service Manual - Page 42

Audio amplifier

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18 Bin _L I 19 Bout _L O 20 Bin _R I 21 Bout _R O 22 RRout O 23 LRout O 24 RFout O 25 LFout O 26 Dgnd - 27 Date I 28 Clk I Left bass controller input channel Left bass controller output channel Right bass controller input channel Right bass controller output channel Right rear speaker output Left rear speaker output Right front speaker output Left front speaker output Digital ground IIC Date IIC Clk ICA1 control & regulate the voltage (12Vto9V) to the ICA2 Volume signal through ICA2 pin24 (right) pin25 (left) into audio amplifier ICA3 2.2 Audio amplifier: ICA3 (TDA1517) is an integrated class-B dual output amplifier; it contains two identical amplifier differential input stages. The gain of each amplifier is fixed at 20 dB. Pins 1 and 9 are right and left channel inputs respectively. Pins 4 and 6 are right and left channel outputs which connect to two 8 OHM speakers. Pin 8 is the mute/stand-by Pin 7 is the voltage input for ICA1 ViewSonic Corporation 48! Confidential - Do Not Copy VX800-3

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18
Bin _L
I
Left bass controller input channel
19
Bout _L
O
Left bass controller output channel
20
Bin _R
I
Right bass controller input channel
21
Bout _R
O
Right bass controller output channel
22
RRout
O
Right rear speaker output
23
LRout
O
Left rear speaker output
24
RFout
O
Right front speaker output
25
LFout
O
Left front speaker output
26
Dgnd
-
Digital ground
27
Date
I
IIC Date
28
Clk
I
IIC Clk
ICA1 control & regulate the voltage (12Vto9V) to the ICA2
Volume signal through ICA2 pin24 (right) pin25 (left) into audio amplifier
ICA3
2.2 Audio amplifier:
ICA3 (TDA1517) is an integrated class-B dual output amplifier; it contains two
identical amplifier differential input stages. The gain of each amplifier is fixed at 20 dB.
Pins 1 and 9 are right and left channel inputs respectively.
Pins 4 and 6 are right and
left channel outputs which connect to two 8 OHM speakers.
Pin 8 is the mute/stand-by
Pin 7 is the voltage input for ICA1
ViewSonic Corporation
Confidential – Do Not Copy
VX
8
00-3