Daewoo 14Q1 Service Manual page 22

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
CVBS
16
(4) Pin Description
SYMBOL PIN
fp1/IDENT 1
TEST 2
Vp 3
n.c. 4
n.c. 5
GND 6
CLOCHEref 7
PLL ref 8
-(R-Y) 9
-(B-Y) 10
n.c. 11
n.c. 12
n.c. 13
n.c. 14
SAND 15
CVBS 16
CLOCHE
ref
100 nF
7
BANDGAP TUNING
CLOCHE
ACC
FILTER
INTERFACE
CONTROL
1 15
f /IDENT
SAND
ref
DESCRIPTION
reference frequency input/identification input
test output
positive supply voltage
not connected
not connected
ground
Cloche reference filter
PLL reference
-(R-Y) output
-(B-Y) output
not connected
not connected
not connected
not connected
sandcastle pulse input
video (chrominance) input
PLL GND
ref
V
p
220 nF
8 3 6
TUNING
TDA8395
DE-
PLL
EMPHASIS
IDENT- OUTPUT
IFICATION
STAGE
21
TEST
2
–(R-Y)
9
10
–(B-Y)