Daewoo 2898ST, Service Manual

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2 5
TDA8395 (Secam Decoder)
(1) Features
Fully integrated filters
Alignment free
For use with baseband delay
(2) Description
The TDA8395 is a self-calibrating,fully integrated SECAM decoder. The IC should preferably be used
in conjunction with the PAL/NTSC decoder TDA8362 and with the switch capacitor baseband delay
circuit TDA4665. The IC incorporates HF and LF filters, a demodulator and an identification circuit
(Iuminance is not processed in this IC).
A highly stable reference frequency is required for calibration and a two-level sandcastle pulse for
blanking and burst gating.
(3) Block Diagram
BANDGAP TUNING TUNING
ACC
CLOCHE
FILTER
PLL
DE-
EMPHASIS
INTERFACE
CONTROL
IDENT-
IFICATION
OUTPUT
STAGE
CLOCHE
ref
PLL
ref
GND
220 nF 100 nF
V
p
TEST
CVBS
16
7 8 3 6 2
1 15
f
ref
/IDENT
SAND
9
10
–(R-Y)
–(B-Y)
TDA8395
(4) Pin Description
SYMBOL PIN DESCRIPTION
fp1/IDENT 1 reference frequency input/identification input
TEST 2 test output
Vp 3 positive supply voltage
n.c. 4 not connected
n.c. 5 not connected
GND 6 ground
CLOCHEref 7 Cloche reference filter
PLL ref 8 PLL reference
-(R-Y) 9 -(R-Y) output
-(B-Y) 10 -(B-Y) output
n.c. 11 not connected
n.c. 12 not connected
n.c. 13 not connected
n.c. 14 not connected
SAND 15 sandcastle pulse input
CVBS 16 video (chrominance) input