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
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 = 25C
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 = 25C
Operating Characteristics
at Ta = 25C, V
CC
= 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
65C
*
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
s
Sync separator output
T
SYR
The SYNC-OUT delay time
0.9
1.1
1.3
s
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.
No. 5473-4/8
LA7437, 7437A
Parameter
Symbol
Conditions
min
typ
max
Unit
[Record Mode Y System]
White insertion level (playback)
WH
P
With 1.3 V applied to T14A
150
300
450
mV
Sync separator output level
V
SYP
The SYNC-OUT output pulse wave height
3.9
4.2
4.5
V
Sync separator output pulse width
PW
SYP
The SYNC-OUT output pulse width
4.2
4.5
4.8
s
Sync separator output
T
SYP
1.4
1.6
1.8
s
pre-record delay time
4.2 V regulator voltage
V
REG
4.0
4.2
4.4
V
[Record Mode Chrominance System]
Chrominance low band
V
OR-38
Input: PAL/GBI standard color bar signal, 1 Vp-p
150
190
230
mVp-p
conversion output burst level
VXO oscillator level 1
V
VXO-R1
Input: PAL/GBI standard color bar signal, 1 Vp-p
300
500
700
mVp-p
Record ACC characteristics 1
ACC
-R1
With only the chrominance signal level increased 6 dB
+0.2
+0.6
dB
Record ACC characteristics 2
ACC
-R2
With only the chrominance signal level decreased 6 dB
0.5
0.1
dB
ACC killer on input level
V
ACCK-ON
26
dB
ACC killer on output level
V
O-ACCK
60
50
dB
ACC killer recovery input level
V
ACCK-OFF
20
dB
VXO control sensitivity
S
VXO
3.8
5.7
7.6
Hz/m
APC pull-in range 1
f
APC1
350
Hz
APC pull-in range 2
f
APC2
350
Hz
BGP delay time
t
D
Input: PAL/GBI standard color bar signal, 1 Vp-p
3.1
3.4
3.7
s
BGP pulse width
t
W
4.7
4.9
5.1
s
AFC pull-in range 1
f
AFC1
+1.0
+7.0
kHz
AFC pull-in range 2
f
AFC2
3.7
1.0
kHz
[Playback Mode Chrominance System]
Video output burst level
V
OP-11
SP mode, input: burst 30 mVp-p
255
300
345
mVp-p
Pin 25 output burst level
V
OP-25
SP mode, input: burst 30 mVp-p
195
230
265
mVp-p
Playback ACC characteristics 1
ACC
-P1
With the chrominance level increased 6 dB
+0.5
+0.8
dB
Playback ACC characteristics 2
ACC
-P2
With the chrominance level decreased 6 dB
0.8
0.5
dB
Playback killer on input level
V
ACK-P
40
32
25
dB
Playback killer on chrominance
V
OACK-P
44
40
dB
output level
Main converter carrier leakage
C
LP
The 5.06 MHz carrier leakage component
40
33
dB
Burst de-emphasis level NT
G
BD
NTSC mode
5.25
5.0
4.75
dB
Playback XO output level 1
V
XO-P1
300
450
600
mVp-p
Playback XO oscillator
f
XO
fXO = f 4.43361875 (MHz)
9
0
+9
Hz
frequency deviation
SLD detector current 1
I
SLD1
135
A
SLD detector current 2
I
SLD2
135
A
NTSC playback burst output level
V
BNT
NTSC mode
255
300
345
mVp-p
NTSC to PAL conversion -
VB-NAP
1.0
0.0
+1.0
dB
V axis burst level
NTSC to PAL conversion burst
B-NAP
2.0
0.0
+2.0
dB
level ratio
Continued on next page.
Continued from preceding page.
No. 5473-5/8
LA7437, 7437A
LA7437A Control Pin Table
Note: Do not allow pin 3 to fall under 1.5 V. (The chip will enter test mode.)
Function Control in each of the LA7437A Operating Modes
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.
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
1.5 to 2.5 VDC
3.5 VDC or more
YNR-off
YNR-CTL
YNR (strong)
R
******
3.9 VDC or more
11
P
N, C, CTL
1.5 VDC or less
2.0 to 3.0 VDC
N, C-off
N, C-CTL
17
R/P
C-rotary
0 to 1.9 VDC
2.3 VDC or more
Low CH
High CH
19
P
QV/QH CHARA. INS
0.8 VDC or less
1.2 to 2.2 VDC
2.6 to 3.3 VDC
3.7 VDC or more
Through
CHARA insert
Pedestal insert
QV insert
25
R/P
EP/LP/SP
1.2 VDC or less
2.0 to 2.7 VDC
3.9 VDC or more
SP
LP
EP
28
R
SP carrier shift stop
3.0 VDC or more
SP carrier shift stop
27
P
NAP
1.2 VDC or less
2.0 to 2.7 VDC
3.3 VDC or more
Through
Balanced-mod output
NAP-on
30
R/P
NT/MESEC/PAL
1.2 VDC or less
2.0 to 2.7 VDC
3.9 VDC or more
PAL
MESEC
NTSC
33
P
Trick
3.9 VDC or more
2
P
DOC-off
4.1 VDC or more
6
R/P
PB-H
4.0 VDC or more
YNR
Detail enhancer
NC
1/2 f
H
Edit
Pin 40 control
Pin 11 control
Pin 11 control
PIC-CTL
carrier
shift
L
M
H
L
M
H
L
M
H
On
Off
Off
Off
Off
Variable
Center
--
--
--
--
q
q
SP
(
!
)
Off
Off
Off
Off
Off
Variable
Center
--
--
--
--
q
q
REC
(
!
)
On
Off
K1 = 0.2 K1 = 0.2
Off
Variable
Center
--
--
--
--
q
q
LP
K2 = 0.0 K2 = 0.0
EP
Off
Off
K1 = 0.5 K1 = 0.5
Off
Variable
Center
--
--
--
--
q
q
K2 = 0.0 K2 = 0.0
On
K1 = 0.0 K1 = 0.0 K1 = 0.5
--
--
--
Off
Variable
Center
Center
--
SP
K2 = 0.0 K2 = 0.0 K2 = 0.0
Off
K1 = 0.0 K1 = 0.2 K1 = 0.5
--
--
--
Off
Variable
Center
q
q
--
PB
K2 = 0.0 K2 = 0.0 K2 = 0.0
On
K1 = 0.0 K1 = 0.2 K1 = 0.5
--
--
--
Off
Variable
Center
Center
--
LP
K2 = 0.5 K2 = 0.5 K2 = 0.5
EP
Off
K1 = 0.0 K1 = 0.2 K1 = 0.5
--
--
--
Off
Variable
Center
q
q
--
K2 = 0.5 K2 = 0.5 K2 = 0.5
No. 5473-6/8
LA7437, 7437A
LA7437 Test Circuit
No. 5473-7/8
LA7437, 7437A
LA7437 Block Diagram
No. 5473-8/8
LA7437, 7437A
This catalog provides information as of December, 1997. Specifications and information herein are subject to
change without notice.
s
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
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