Philips 21PT9457 Service Manual page 45

Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.4.6 Diagram A7, TDA9850, (IC801)
Block Diagram
C3
C2
R1
13
14
STEREO DECODER
INPUT
composite
11
LEVEL
baseband
ADJUST
input
C1
SAP
DEMODULATOR
5
+
C16
Pin Configuration
ceramic
C4
C5
Q1
resonator
15 16 17
NOISE
DETECTOR
DBX
4 2
26 3 1
R2
+
C15 C17
C14
R3
C13
VEO
VEI
C NR
C M
C DEC
A G N
DGND
SDA
SCL
V CC
COMP
V CAP
C P1
C P2
C PH
C ADJ
Figure 9-7 Block Diagram and Pin Configuration
L + R
L − R/SAP
TDA9850
STEREO/SAP
SWITCH
STEREO
ADJUST
32 25 20 10
31 30 29
+ + + + + +
C12 C11 C10 C9 C C
L R
V
only during
CC
adjustment
C S
1 32
C W
2 31
C TS
3 30
C TW
4 29
5 28 MAD
D 6 27 O U T L
C ND
7 26
C L
8 25
TDA9850
V ref
9 24
10 23 SAP
C SDE
11 22
OUTR
12 21
C R
13 20
C SS
14 19
C MO
15 18
CER
16 17
SK4.0L CA
C6 C7
18 19
DEMATRIX
+
MODE
SELECT
DE-EMPHASIS
2
LOGIC, I C-
SUPPLY
TRANSCEIVER
12 6
24 8 9
+
+
C19
C18
SDA SCL
V V
CAP ref
9. EN 45
stereo
27
mono
OUTL
SAP
to
21
audio
OUTR
processing
C8
22
23
SAP without DBX
7
28
MAD
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