Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.
9.3.9
IC1001 (MSP3425)
The SIF signal is sent out from Pin31 of IC201. It passes
through Q241, R241 and X241.
SIF will be finally sent into Pin2 of IC1001. An analog automatic
gain control circuit (AGC) allows a wide range of input levels.
The analog-to-digital conversion of the IF sound signal is done
by an A/D-converter. The high pass filter, formed by a coupling
capacitor at suppresses video components.
IC1001 is controlled via the I2C bus slave interface.
The (analog) sound signal will go from Pin26/27 of IC1001 to
Pin1/5 of IC601. IC601 is a class AB power audio amplifier. The
output voltage of IC601 drives the speakers. The volume is
adjusted via the I2C bus.
Table 9-3 Sound Processor
Pin No.
Pin Name
Type
Short Description
1
AVSUP
Analog power supply
+5V
2
IN
IF Input 1
3
ANA_IN-
IN
IF common
4
TESTEN
IN
Test pin
5
XTAL_IN
IN
Crystal oscillator
6
XTAL_OUT
OUT
Crystal oscillator
7
TP
Test pin
8
D_CTR_I/O_1 IN/OUT
D_CTR_I/O_1
9
D_CTR_I/O_0 IN/OUT
D_CTR_I/O_0
10
ADR_SEL
IN
I2C BUS address select
11
STANDBYQ
IN
Stand-by (Low-active)
12
I2C_CL
IN/OUT
I2C clock
13
I2C_DA
IN/OUT
I2C data
14
I2S_CL
I2S clock
15
I2S_WS
I2S word strobe
16
I2S_DA_OUT
I2S data output
17
I2S_DA_IN1
I2S1 data input
18
ADR_CL
ADR clock
19
DVSUP
Digital power 5
V
20
DVSS
Digital ground
21
I2S_DA_IN2
I2S2 data input
22
RESETQ
IN
Power-on-reset
23
NC
Not connected
24
NC
Not connected
25
VREF2
Reference ground 2
High-voltage part
26
DACM_R
OUT
Loudspeaker out, right
27
DACM_L
OUT
Loudspeaker out, left
28
NC
Not connected
29
VREF1
Reference Ground 1
High voltage part
30
SC1_OUT_R
OUT
Audio 1 output, right
31
SC1_OUT_L
OUT
Audio 1 output, left
32
NC
Not connected
33
AHVSUP
Analog power supply
8.0V
34
CAPL_M
Volume capacitor MAIN
35
AHVSS
Analog ground
36
AGNDC
Analog reference voltage
High-voltage part
37
SC2_IN_L
IN
Audio 2 input, left
38
SC2_IN_R
IN
Audio 2 input, right
39
ASG
Analog shield Ground
40
SC1_IN_L
IN
Audio 1 input, left
41
SC1_IN_R
IN
Audio 1 input, right
42
VREFTOP
Reference voltage IF A/D
converter
43
MONO_IN
IN
Mono input
44
AVSS
Analog ground
Pin No.
Pin Name
Type
Short Description
