SANYO LA7437, LA7437A Datasheet
Overview
The LA7437, 7437A is a video signal processing singlechip 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 specialpurpose CCD
Crosstalk can be excluded without using a glass delay
line by combining the LA7437, 7437A with a specialpurpose 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
Monolithic Linear IC
41096HA (OT) No. 5473-1/8
SANYO: DIP42S
[LA7437, 7437A]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
Video Signal Processing IC
for VHS VCR Systems
LA7437, 7437A
Ordering number : EN5473
No. 5473-2/8
LA7437, 7437A
Functions
All VHS format VCR signal processing functions
Specifications
Maximum Ratings at Ta = 25°C
Note: * When mounted on a 70 mm by 65 mm, 1.5 mm thickness Bakelite board. The value for the DIP package is 1150 mW.
Operating Conditions at Ta = 25°C
Operating Characteristics at Ta = 25°C, VCC= 5.0 V
Luminance Chrominance
Video amp.
4.43 BPF Half H killer
Feed back clamp
ACC amp. BGP generator
Main LPF
ACC det. Killer det.
R/P YNR (AVNS)
Main converter VCO
VCA
1.3 M LPF Phase shifter
Sync separator
VXO/XO Sub converter
4.2 V regulator
Side lock det. 5.06 BPF
3rd lock protector
Video AGC amp. NL emphasis Pre amp. Burst gate amp.
Video AGC det. Main emphasis Burst emphasis (NTSC)
REC Pre LPF White/dark clip Killer
Detail enhancer FM modulator APC det.
1/2 f
H
carrier shift AFC det.
FM AGC amp. Drop out det. Pre amp. APC det.
FM AGC det. NL de-emphasis Burst de-emphasis (NTSC) ID det.
Double limiter Picture control PB amp. DCC
FM demodulator Y/C mix Killer Trick det.
PB Sub LPF NAP DPLL
Double high pass noise canceller PAL burst sequence
QV/QH/character insert – Compensator
Main de-emphasis Carrier balancer
DOC Burst gate amp.
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max 7.0 V
Allowable power dissipation Pd max Ta ≤ 65°C* 1350* mW
Operating temperature Topr –10 to +65 °C
Storage temperature Tstg –40 to +150 °C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
CC
5.0 V
Operating supply voltage V
CC
op 4.8 to 5.5 V
Parameter Symbol Conditions min typ max Unit
[Record Mode Y System]
Record mode current drain I
CCR
Input: 1.0 Vp-p video signal 100 130 160 mA
EE output level 1 V
EE
1 Input: 50 Hz system 1.0 Vp-p video signal 2.0 2.1 2.2 Vp-p
AGC characteristics 1 AGC1 Input: 50 Hz system 2.0 Vp-p video signal 2.11 2.21 2.31 Vp-p
AGC characteristics 2 AGC2 Input: 50 Hz system 0.5 Vp-p video signal 1.99 2.09 2.19 Vp-p
AGC characteristics 3 AGC3 Input: 50 Hz system with only SYNC increased 6 dB 590 660 730 mVp-p
AGC characteristics 4 AGC4 Input: 50 Hz system with only SYNC decreased 6 dB 340 380 420 mVp-p
Sync separator output level V
SYR
The SYNC-OUT output pulse wave height 3.9 4.2 4.5 V
Sync separator output pulse width PW
SYR
The SYNC-OUT output pulse width 3.9 4.2 4.6 µs
Sync separator output
∆T
SYR
The SYNC-OUT delay time 0.9 1.1 1.3 µs
prerecord delay time
Sync separator threshold level TH
SYR
–20 –15 dB
Continued on next page.
No. 5473-3/8
LA7437, 7437A
Parameter Symbol Conditions min typ max Unit
[Record Mode Y System]
Pseudo-H insertion level ∆HD
R
With 2.7 V applied to T19A –300 –200 –100 mV
White insertion level ∆WH
R
With 1.3 V applied to T19A 150 300 450 mV
VCA detection voltage V
VCA
2.95 3.10 3.25 V
Record YNR operation EP/LP V
R-YNR1
Input: 50 Hz system standard color bar signal 10 12 14 mVp-p
Y-LPF frequency characteristics 1 YLPF1 The 1 MHz attenuation with respect to 500 kHz –0.5 0.0 +0.5 dB
Y-LPF frequency characteristics 2 YLPF2 The 2 MHz attenuation with respect to 500 kHz –1.0 0.0 +1.0 dB
Y-LPF frequency characteristics 3 YLPF3 The 3.25 MHz attenuation with respect to 500 kHz –6 –4 –2 dB
Y-LPF frequency characteristics 4 YLPF4 The 4.43 MHz attenuation with respect to 500 kHz –33 –25 dB
FM modulator output level V
FM
No input 1.0 1.2 1.4 Vp-p
Carrier frequency 1 F
FM1
50 Hz system 3.7 3.8 3.9 MHz
FM modulator output 2nd
H
MOD
–40 –35 dB
harmonic distortion
Deviation 1 DEV1 50 Hz system 0.95 1.00 1.05 MHz
FM modulator linearity L
MOD
–2 0 2 %
1/2 f
H
carrier shift CS 6.5 7.8 9.1 kHz
Emphasis gain G
EMP
Input: 0.5 Vp-p, 10 kHz sine wave –0.5 0.0 0.5 dB
NL emphasis characteristics 1 G
NLEMP1
Input: 500 mVp-p, 2 MHz sine wave 0.5 1.4 2.3 dB
NL emphasis characteristics 2 G
NLEMP2
Input: 158 mVp-p, 2 MHz sine wave 2.6 3.8 5.2 dB
NL emphasis characteristics 3 G
NLEMP3
Input: 50 mVp-p, 2 MHz sine wave 4.9 6.4 7.9 dB
Main emphases characteristics 1 G
ME1
Input: 100 mVp-p, 500 kHz sine wave 4.9 5.2 5.5 dB
Main emphases characteristics 2 G
ME2
Input: 100 mVp-p, 2 MHz sine wave 13.1 13.6 14.1 dB
White clipping level L
WC
Input: 1.0 Vp-p, white 100% video signal 176 185 194 %
Dark clipping level L
DC
Input: 1.0 Vp-p, white 100% video signal –55 –50 –45 %
[Playback Mode Y System]
Playback mode current drain I
CCP
135 160 185 mA
Dropout compensation time T
DOC
0.72 0.85 0.98 ms
DOC loop gain G
DOC
5H later –1.0 0.0 +1.0 dB
Playback Y level V
VOUT
For playback of an FM signal with a 1.0 MHz deviation 2.0 2.1 2.2 Vp-p
FM demodulator linearity L
DEM
2, 4, 6 MHz –3.5 0.0 +3.5 %
Demodulation sensitivity S
DEM
0.43 0.48 0.53 V/MHz
Carrier leakage CL Input: 4 MHz, 600 mVp-p –40 –35 dB
Playback YNR characteristics
G
P-YNR1
Input: 50% white + CW –2.5 –3.0 –3.5 dB
LP/EP
NL de-emphasis characteristics 1 G
NLDE1
Input: 158 mVp-p, 2 MHz sine wave –6.0 –5.0 –4.0 dB
NL de-emphasis characteristics 2 G
NLDE2
Input: 50 mVp-p, 2 MHz sine wave –10.5 –9.0 –7.5 dB
Double noise canceller
G
WNC1
Input: 158 mVp-p, 2 MHz sine wave –1.8 –1.3 –0.8 dB
characteristics 1
Double noise canceller
G
WNC2
Input: 50 mVp-p, 2 MHz sine wave –6.2 –5.2 –4.2 dB
characteristics 2
Double noise canceller
G
WNC3
Input: 15.8 mVp-p, 2 MHz sine wave –11.7 –10.7 –8.7 dB
characteristics 3
PIC-CTL hard response
G
PH1
Input: 50% video + sine wave f = 1 MHz, 158 mVp-p 4.0 5.0 6.0 dB
characteristics 1
PIC-CTL hard response
G
PH2
Input: 50% video + sine wave f = 2 MHz, 158 mVp-p 6.5 7.5 8.5 dB
characteristics 2
PIC-CTL soft response
G
PS1
Input: 50% video + sine wave f = 1 MHz, 158 mVp-p –4.5 –3.5 –2.5 dB
characteristics 1
PIC-CTL soft response
G
PS2
Input: 50% video + sine wave f = 2 MHz, 158 mVp-p –9.0 –7.0 –5.0 dB
characteristics 2
Pseudo-V insertion level
∆VD
P
With 5 V applied to T19A –150 –50 +50 mV
(playback)
Pseudo-H insertion level
∆HD
P
With 2.7 V applied to T19A –300 –200 –100 mV
(playback)
Continued on next page.
Continued from preceding page.
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