Sanyo LA7425 Specifications
Monolithic Linear IC
Ordering number : EN5110
51595TH (OT) No. 5110-1/7
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
NTSC Format Single-Chip Signal Processing IC
for VHS VCR Products
LA7425
Overview
The LA7425 is a single-chip video signal processing IC
for use in VHS format VCR products. The number of
required adjustments has been reduced to a single
adjustment by IC chip internal trimming. The
incorporation of a playback equalizer and other circuits on
chip provides a significant reduction in external
components and thus significantly reduces the cost of
manufacturing the signal processing printed circuit board.
This product can also support simplified S-VHS playback,
which is becoming a standard feature in VCR products in
the Japanese market.
Features
• Only one adjustment point (comb filter phase
adjustment)
(The AGC, carrier, deviation and PB-Y level are
adjustment free.)
(If an LA7411/16 is used as the head amplifier, the Y/C
record current will also be adjustment free.)
• Simplified S-VHS playback support
— Built-in S-VHS discrimination circuit
— Built-in equalizer switch
— Automatic demodulator gain switching
— Internal automatic de-emphasis characteristics
switching
• Only a minimal number of external components
required (85 components: This corresponds to a 38%
reduction over previous Sanyo products ... CNR and
SQPB not handled, and REC EQ not included.)
Components newly incorporated on chip:
— Playback equalizer (include chroma trap), limiter
balance filter, capacitor and resistor for detail
enhancer, record chroma 7.8 MHz trap, playback
chroma LPF, ACC filter
• High performance/multifunctionality
Linear phase type picture controller
Double high-pass noise canceller, high-speed AFC,
DCC
New built-in functions
— FM AGC, synchronization detection circuit, linear
control circuit for high-pass noise canceller,
playback mode Y/C separator output, chroma noise
canceller
• Single CCD system
The LA7425 supports the following functions with the
addition of only a single CCD (1H delay) device: comb
filter, YNR, DOC and chroma crosstalk cancellation.
Thus the cost of external components is lowered.
• Full HQ support (YNR, CNR, detail enhancer and WCL
up)
Package Dimensions
unit: mm
3170-DIP36S
SANYO: DIP36S
[LA7425]
Functions
All VHS format VCR (NTSC) signal processing functions
Specifications
Maximum Ratings at Ta = 25°C
Operating Conditions at Ta = 25°C
Operating Characteristics at Ta = 25°C, V
CC
= 5.0 V
No. 5110-2/7
LA7425
Luminance Chrominance
Video amp.
3.58 BPF Half H killer
Feedback clamp
ACC amp. BGP generator
Main LPF
ACC det. Killer det.
R/P YNR
Main converter VCO
VCA
1.3 M LPF Phase shifter
Sync separator
VXO/XO Sub converter
4.1 V regulator
Side lock det. 4.21 BPF
3rd lock protecter
Video AGC amp. NL emphasis Pre amp.
Video AGC det. Main emphasis Burst emphasis
REC
Pre LPF White/dark clip Killer
Y/C comb filter FM modulater APC det.
Detail enhancer Sync det. AFC det.
1/2 f
H
carrier shift Burst gate amp.
FM equalizer QV/QH/character insert Pre amp. APC det.
629 chroma trap Sub LPF Burst de-emphasis ID det.
FM AGC amp. Main de-emphasis PB amp. DCC
PB
FM AGC det. DOC Killer Trick det.
S-VHS det. Drop out det. CNR DPLL
Double limiter NL de-emphasis Carrier balancer
FM demodulator Picture control Burst gate amp.
Double high-pass noise canceller Y/C mix Chroma noise canceller
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max 7.0 V
Allowable power dissipation Pd max Ta ≤ 65°C 1070 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 range 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 95 120 145 mA
EE output level V
EE
The T28 output level 2.04 2.15 2.26 Vp-p
AGC characteristics 1 AGC1 With the input level increased 6 dB 0 0.5 1.0 dB
AGC characteristics 2 AGC2 With the input level decreased 6 dB –1.0 –0.3 0 dB
AGC characteristics 3 AGC3
Input: with only the sync level increased 6 dB,
540 600 660 mVp-p
measure the T28 sync level.
AGC characteristics 4 AGC4
Input: with only the sync level decreased 6 dB,
370 410 450 mVp-p
measure the T28 sync level.
Sync separator output level V
SYR
The T26 output pulse peak value 4.0 4.4 4.6 Vp-p
Sync separator output pulse width PW
SYR
The T26 output pulse width 4.1 4.4 4.7 µs
Sync separator output leading
∆T
SYR
0.8 1.0 1.2 µs
edge delay time
Sync separator threshold level TH
SYR
–23 –19 dB
VCA detection voltage V
VCA
3.00 3.20 3.40 V
Continued on next page.
Continued from preceding page.
No. 5110-3/7
LA7425
Parameter Symbol Conditions min typ max Unit
Y comb characteristics G
Y-COMB
Input: chroma noise test signal 1 Vp-p, measure T2. –25 dB
C comb characteristics G
C-COMB
Input: white 50% plus CW 3 MHz, measure T21. –25 dB
Record YNR operation EP/LP R-YNR 10 12 14 mV
CCD front-end LPF frequency
PFIL1 The attenuation at 4 MHz referenced to 500 kHz 0 0.5 1.0 dB
characteristics 1
CCD front-end LPF frequency
PFIL2 The attenuation at 10 MHz referenced to 500 kHz –17 –15 –13 dB
characteristics 2
Y LPF frequency characteristics 1 YLPF1 The attenuation at 1 MHz referenced to 500 kHz –0.5 0 +0.5 dB
Y LPF frequency characteristics 2 YLPF2 The attenuation at 2 MHz referenced to 500 kHz –0.5 +0.5 +1.5 dB
Y LPF frequency characteristics 3 YLPF3 The attenuation at 3 MHz referenced to 500 kHz –8 –6 –4dB
Y LPF frequency characteristics 4 YLPF4 The attenuation at 3.58 MHz referenced to 500 kHz –15 dB
Y LPF frequency characteristics 5 YLPF5 The attenuation at 4.2 MHz referenced to 500 kHz –15 dB
FM modulator output level V
FM
With no input signal 0.96 1.08 1.21 mVp-p
FM modulator output second
H
MOD
–40 –35 dB
harmonic distortion
Carrier frequency F
FM
3.30 3.40 3.50 MHz
Deviation FM
DEV
0.95 1.00 1.05 MHz
FM modulator linearity L
MOD
T3 = 2.6 V, 2.85 V, 3.1 V –2 0 +2 %
1/2 f
H
carrier shift CS 6.8 7.8 9.5 kHz
Emphasis gain G
EMPH
Input: 0.5 Vp-p 10 kHz sine wave –0.5 0 +0.5 dB
Detail enhancer characteristics 1 G
ENH1
Input: –10 dB, 2 MHz 1.6 1.9 2.6 dB
Detail enhancer characteristics 2 G
ENH2
Input: –20 dB, 2 MHz 3.1 4.1 5.1 dB
Detail enhancer characteristics 3 G
ENH3
Input: –30 dB, 2 MHz 5.3 6.3 7.3 dB
Detail enhancer characteristics 4 G
ENH4
Input: –30 dB, 2 MHz, edit mode 2.9 3.9 4.9 dB
NL emphasis characteristics 1 G
NLEMP1
Input: 500 mVp-p, 2 MHz 0.5 1.4 2.3 dB
NL emphasis characteristics 2 G
NLEMP2
Input: –10 dB, 2 MHz 2.6 3.8 5.2 dB
NL emphasis characteristics 3 G
NLEMP3
Input: –20 dB, 2 MHz 4.9 6.4 7.9 dB
Main emphasis characteristics 1 G
ME1
Input: –20 dB, 200 kHz 4.9 5.2 5.5 dB
Main emphasis characteristics 2 G
ME2
Input: –20 dB, 2 MHz 13.1 13.6 14.1 dB
White clipping level L
WC
Input: 1.0 Vp-p white 100% video signal 180 190 200 %
Dark clipping level L
DC
Input: 1.0 Vp-p white 100% video signal –55 –50 –45 %
Synchronization detector
V
SYDET
2.7 3.0 3.3 V
output level
[Playback Mode Y System]
Playback mode current drain I
CCP
120 150 180 mA
FM equalizer characteristics 1 G
FM-EQ1
Input: 300 mVp-p, 4 MHz –1.0 +1.0 +3.0 dB
FM equalizer characteristics 2 G
FM-EQ2
Input: 300 mVp-p, 629 kHz –30 dB
Dropout compensation period T
DOC
81012H
DOC loop gain G
DOC
5H later –1.0 0 +1.0 dB
Playback Y level V
Y-OUT
2.04 2.15 2.26 Vp-p
FM demodulator linearity L
DEM
2, 4, 6 MHz –3.5 0 +3.5 %
Demodulator carrier leakage CL Input: 4 MHz, 300 mVp-p –40 –35 dB
Playback YNR characteristics 1
P-YNR1 Input: white 50% plus CW –9 –8 –7dB
(LP/EP)
Playback YNR characteristics 2
P-YNR2 Input: white 50% plus CW –4.5 –3.5 –2.5 dB
(SP)
NL de-emphasis characteristics 1 G
NLDEEM1
Input: –10 dB, 2 MHz –6.0 –5.0 –4.0 dB
NL de-emphasis characteristics 2 G
NLDEEM2
Input: –20 dB, 2 MHz –9.0 –8.0 –7.0 dB
Noise canceller characteristics 1 G
WNC1
Input: –10 dB, 1.2 MHz –2.7 –2.2 –1.7 dB
Noise canceller characteristics 2 G
WNC2
Input: –20 dB, 1.2 MHz –7 –6 –5dB
Noise canceller characteristics 3 G
WNC3
Input: –30 dB, 1.2 MHz –13 –11 –9dB
Continued on next page.
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