U4935B Datasheet, PDF (1/16 Pages) TEMIC Semiconductors – SECAM Decoder

SECAM Decoder
U4935B
Description
The U4935B is an SECAM decoder designed for use with
the PAL/NTSC TV baseband processor U4930B and the
baseband delay line U3665M.
The circuit includes a bell filter, a demodulator and an
identification circuit. A signal with stable reference fre-
quency for calibration and a three-level sandcastle pulse
for blanking and burst gating are required.
The IC is realized in a bipolar VLSI technology and
operates with +8 V supply voltage. Easy interfacing and
few external components support the design of a
multistandard TV.
Features
D Fully integrated and auto-tuned filters
D Minimum number of external components
D Easy interfacing with the TV baseband processor and
the switched capacitor baseband delay line
Package
16-pin dual in-line plastic (DIP16)
Block Diagram
CVBS ¹⁶
in
ACC
Bell
filter
ref 7
Bell-filter
tuning
Interface
Bell filter
out
2
0.1 mF
PLL
PLL
auto2
auto1
12
13
0.1 mF
Bell
filter
AMP
PLL
V_S = 8 V
22 mF
3
Bandgap
4 Band
gap
Ident
De–
emphasis
SECAM
sw.
B –Y ^{10 – (B–Y)}
output
out
R –Y 9 _{– (R–Y)}
output
out
PLL
tuning
Pulse
gen.
1
f_ref/
ident
5
8
Killer
PLL
out _{0.47 mF} ^ref
15
SCP
in
6 14
11
GND _{Black Black}
adj. R ^{adj. B}
96 11715
Figure 1. Block diagram
Ordering Information
Extended Type Number
U4935B-ADP
Package
DIP16
Remarks
TELEFUNKEN Semiconductors
1 (16)
Rev. A1, 28-Jan-97
Preliminary Information