LA7437 Datasheet, PDF (5/8 Pages) Sanyo Semicon Device – Video Signal Processing IC for VHS VCR Systems

LA7437, 7437A
LA7437A Control Pin Table
Pin No.
Control function
L
M
H
9
R/P Edit
3.8 VDC or more
40
R/P YNR (AVNS)-CTL
1.0 VDC to less
YNR-off
1.5 to 2.5 VDC
YNR-CTL
3.5 VDC or more
YNR (strong)
R ******
3.9 VDC or more
11
P N, C, CTL
1.5 VDC or less
N, C-off
2.0 to 3.0 VDC
N, C-CTL
17
R/P C-rotary
0 to 1.9 VDC
Low CH
2.3 VDC or more
High CH
0.8 VDC or less
19
P QV/QH CHARA. INS
Through
1.2 to 2.2 VDC
CHARA insert
2.6 to 3.3 VDC
Pedestal insert
3.7 VDC or more
QV insert
25
R/P EP/LP/SP
1.2 VDC or less
SP
2.0 to 2.7 VDC
LP
3.9 VDC or more
EP
28
R SP carrier shift stop
3.0 VDC or more
SP carrier shift stop
27
P NAP
1.2 VDC or less
Through
2.0 to 2.7 VDC
Balanced-mod output
3.3 VDC or more
NAP-on
30
R/P NT/MESEC/PAL
1.2 VDC or less
PAL
2.0 to 2.7 VDC
MESEC
3.9 VDC or more
NTSC
33
P Trick
3.9 VDC or more
2
P DOC-off
4.1 VDC or more
6
R/P PB-H
Note: Do not allow pin 3 to fall under 1.5 V. (The chip will enter test mode.)
4.0 VDC or more
Function Control in each of the LA7437A Operating Modes
YNR
Detail enhancer
Edit
Pin 40 control
Pin 11 control
L
M
H
L
M
H
On
Off
Off
Off
Off Variable Center
SP
Off
Off
Off
Off
Off Variable Center
REC
K1 = 0.2 K1 = 0.2
LP
On
Off _{K2 = 0.0 K2 = 0.0} Off Variable Center
EP
K1 = 0.5 K1 = 0.5
Off
Off _{K2 = 0.0 K2 = 0.0} Off Variable Center
K1 = 0.0 K1 = 0.0 K1 = 0.5
On _{K2 = 0.0 K2 = 0.0 K2 = 0.0} —
—
—
SP
K1 = 0.0 K1 = 0.2 K1 = 0.5
Off _{K2 = 0.0 K2 = 0.0 K2 = 0.0} —
—
—
PB
K1 = 0.0 K1 = 0.2 K1 = 0.5
LP
On _{K2 = 0.5 K2 = 0.5 K2 = 0.5} —
—
—
EP
K1 = 0.0 K1 = 0.2 K1 = 0.5
Off _{K2 = 0.5 K2 = 0.5 K2 = 0.5} —
—
—
Note: 1. K1 is the YNR coefficient, K2 is the LNC coefficient
2. Use the 1/2 f_H carrier shift entries in parentheses when pin 23 is high.
3. The detail enhancer is off when pin 18 is at the middle level.
NC
Pin 11 control
L
M
H
—
—
—
—
—
—
—
—
—
1/2 f_H
PIC-CTL carrier
shift
q
—
(!)
q
—
(!)
—
q
—
—
—
—
q
Off Variable Center Center —
Off Variable Center
q
—
Off Variable Center Center —
Off Variable Center
q
—
No. 5473-5/8