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IC Block Diagrams
IC3451 < Digital TV Sound Processor > TDA9875A
(first general purpose I/O pin)
P1
(second general purpose I/O pin)
P2
2
(first I
C-bus slave
ADDR1
address modifier)
2
(second I
C-bus slave
ADDR2
address modifier)
2
SCL
(I
C-bus clock)
SDA
2
(I
C-bus data)
(crystal oscillator input)
XTALI
(crystal oscillator output)
XTALO
(system clock output)
SYSCLK
2
(I
S-bus data input 1)
SDI1
2
(I
S-bus data input 2)
SDI2
2
(I
S-bus data output 1)
SDO1
2
(I
S-bus data output 2)
SDO2
2
(I
S-bus clock)
SCK
2
WS
(I
S-bus word select)
V DDD1
(digital supply voltage 1)
V DDD2
(digital supply voltage 2)
V SS D1
(supply ground 1)
V SSD2
(supply ground 2)
CRESET
(capacitor for power-on reset)
(first test pin)
TEST1
(second test pin)
TEST2
SIF2
9
20
3
2
INPUT SWITCH
I
C-BUS
13
INTERFACE
4
5
FM (AM)
IDENTIFICATION
DEMODULATION
18
17
DEMATRIX
CLOCK
21
LEVEL
PEAK
ADJUST
DETECTION
27
26
25
2
I
C-BUS
24
AUDIO
INTERFACE
22
23
DIGITAL
SELECT
15
64
DIGITAL
14
SUPPLY
49
16
TDA9875
AUDIO PROCESSING
28
TEST
DAC(2)
30
61
MOL MOR AUXOL AUXOR
SIF1
10
12
SUPPLY
SOUND IF
AGC, ADC
(SIF)
TIMING
DETECTION DAC
NICAM
DEMODULATION
NICAM
DECODER
ANALOG
CROSSBAR
SWITCH
LEVEL
ADJUST
ADC(2)
DAC(2)
SUPPLY
DAC
DAC(2)
SUPPLY DAC
REFERENCE
SUPPLY
OPERATIONAL
AMPLIFIERS
60
58
57
-6-
(analog supply voltage 1)
7
V DDA1
6
V SSA1
(supply ground 1)
11
V
(reference voltage)
ref1
8
I
ref
(resistor for reference
current generator)
19
V
(tuning voltage output for crystal
tune
oscillator)
2
(serial NICAM data output at
NICAM
728 kHz)
1
PCLK
(NICAM clock output at 728 kHz)
33
SCIR1
(SCART 1 input right channel)
34
(SCART 1 input left channel)
SCIL1
36
SCIR2
(SCART 2 input right channel)
37
SCIL2
(SCART 2 input left channel)
31
EXTIR
(external audio input right channel)
32
(external audio input left channel)
EXTIL
29
(audio mono input)
MONOIN
47
SCOR1
(SCART 1 output right channel)
48
SCOL1
(SCART 1 output left channel)
51
SCOR2
(SCART 2 output right channel)
52
SCOL2
(SCART 2 output left channel)
63
(line output right channel)
LOR
62
(line output left channel)
LOL
42
CAPL2
(filter capacitor pin 2 )
41
(filter capacitor pin 1)
CAPL1
45
(filter capacitor pin 1)
CAPR1
44
(filter capacitor pin 2)
CAPR2
(post-filter capacitor pin right channel,
audio digital-to-analog coverter)
54
PCAPR
55
(post-filter capacitor pin
PCAPL
left channel, audio digital-
to-analog converter)
38
V DDA2
(analog supply votage 2)
43
V SSA2
(supply ground 2)
35
V SSG
(ground guards)
46
V
(reference voltage)
ref2
39
(positive reference voltage)
V
ref(P)
40
(reference voltage ground)
V
ref(n)
59
(analog supply voltage)
V DDA3
56
(supply ground 3)
V SSA3
53
(reference voltage)
V
ref3
50
(supply ground 4)
V SSA4
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