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PDF LA7437 Data sheet ( Hoja de datos )

Número de pieza LA7437
Descripción Video Signal Processing IC for VHS VCR Systems
Fabricantes Sanyo 
Logotipo Sanyo Logotipo



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No Preview Available ! LA7437 Hoja de datos, Descripción, Manual

Ordering number : EN5473
Monolithic Linear IC
LA7437, 7437A
Video Signal Processing IC
for VHS VCR Systems
Overview
The LA7437, 7437A is a video signal processing single-
chip IC that handles the PAL-G, B and I, 4.43 NTSC, and
MESECAM formats. IC internal trimming is used to make
the LA7437, 7437A is completely adjustment free, and in
combination with a special-purpose CCD (the
LC89973M) it provides a significant reduction in external
components, including the glass delay line. Thus the
LA7437, 7437A can significantly reduce the signal
processing board manufacturing costs. Furthermore, the
LA7437, 7437A supports the NAP format (NTSC to PAL
conversion) that is poised to become widespread in
Europe, China and other markets.
Features
• Completely adjustment free
The AGC, carrier, deviation, and PB-Y level are
adjustment free.
The YC record current can also be made adjustment free
by using the LA7437, 7437A as the head amplifier.
• Support for NAP and PAL color array correction
Full modulation using a balanced modulator allows
playback and conversion to PAL format of NTSC
signals recorded on tape.
• Crosstalk exclusion in combination with a special-
purpose CCD
Crosstalk can be excluded without using a glass delay
line by combining the LA7437, 7437A with a special-
purpose CCD (the LC89973M).
• Minimal number of external components
New built-in components:
— Detail enhancer CR
— C-trap in the Y low-pass filter
— Playback C low-pass filter
• High performance and multiple functions
Linear phase picture controller
Double high-pass noise canceller, high-speed AFC,
DCC
New built-in functions
— NAP circuit
— AVNS (advanced vertical noise suppresor)
— Automatic QH insertion
— FM AGC
• Miniature package (42-pin DIP)
Package Dimensions
unit: mm
3025B-DIP42S
[LA7437, 7437A]
SANYO: DIP42S
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
41096HA (OT) No. 5473-1/8

1 page




LA7437 pdf
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 LMH
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 fH 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
LMH
———
———
———
1/2 fH
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

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