B. Audio Board
1. Audio processor
ICA2 (PT2313L) is a four-channel digital audio processor utilizing
CMOS Technology. Volume, Bass, Treble, Balance, Front/Rear
Fader Processor is incorporated into a single chip. Loudness function and
Selectable input gain are also provided to build a highly effective electronic
Audio processor having the highest performance and reliability with the
Least external components. And all functions are programmable using the
IIC BUS
PIN# PIN
NAME I/O
DESCRIPTION
1
REF
-
Analog reference voltage (1/2 VDD)
2
VDD
-
Supply input voltage
3 Agnd - Analog
ground
4
Treb_L
I
Left channel input for treble control
5
Treb_R
I
Right channel input for treble control
6
RIN
I
Audio processor right channel input
7
Rout
O
Gain output& input selector for right channel
8
Loud_R
I
Right channel loudness input
9
Rin 3
I
Right channel input 3
10
Rin 2
I
Right channel input 2
11
Rin 1
I
Right channel input 1
12
Loud_L
I
Left channel loudness input
13
Lin 3
I
Light channel input 3
14
Lin 2
I
Light channel input 2
15
Lin 1
I
Light channel input 1
16
LIN
I
Audio processor left channel input
17
Lout
O
Gain output& input selector for left channel
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
ViewSonic Corporation
Confidential
– Do Not Co
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