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Circuit Descriptions, Abbreviation List, and IC Data Sheets
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 SIF_IN1+ 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
1
AVSUP
2
ANA_IN+
3
ANA_IN-
4
TESTEN
5
XTAL_IN
6
XTAL_OUT
7
TP
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
11
STANDBYQ
12
I2C_CL
13
I2C_DA
14
I2S_CL
15
I2S_WS
16
I2S_DA_OUT
17
I2S_DA_IN1
18
ADR_CL
19
DVSUP
20
DVSS
21
I2S_DA_IN2
22
RESETQ
23
NC
24
NC
25
VREF2
26
DACM_R
27
DACM_L
28
NC
29
VREF1
30
SC1_OUT_R
31
SC1_OUT_L
32
NC
33
AHVSUP
34
CAPL_M
35
AHVSS
36
AGNDC
37
SC2_IN_L
38
SC2_IN_R
39
ASG
40
SC1_IN_L
41
SC1_IN_R
Type
Short Description
Analog power supply
+5V
IN
IF Input 1
IN
IF common
IN
Test pin
IN
Crystal oscillator
OUT
Crystal oscillator
Test pin
IN
I2C BUS address select
IN
Stand-by (Low-active)
IN/OUT I2C clock
IN/OUT I2C data
I2S clock
I2S word strobe
I2S data output
I2S1 data input
ADR clock
Digital power supply +5
V
Digital ground
I2S2 data input
IN
Power-on-reset
Not connected
Not connected
Reference ground 2
High-voltage part
OUT
Loudspeaker out, right
OUT
Loudspeaker out, left
Not connected
Reference Ground 1
High voltage part
OUT
Audio 1 output, right
OUT
Audio 1 output, left
Not connected
Analog power supply
8.0V
Volume capacitor MAIN
Analog ground
Analog reference voltage
High-voltage part
IN
Audio 2 input, left
IN
Audio 2 input, right
Analog shield Ground
IN
Audio 1 input, left
IN
Audio 1 input, right
TC8.1L CA
Pin No. Pin Name
Type
42
VREFTOP
43
MONO_IN
IN
44
AVSS
9.
EN 29
Short Description
Reference voltage IF A/D
converter
Mono input
Analog ground
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