Ordering number:ENN3343A
Monolithic Linear IC
LA7680, 7681
Sigle-Chip Signal Processor
for Color TV Use
Overview
Package Dimensions
The LA7680 and LA7681 signal processors provide all the
components required to decode PAL or NTSC Color television signals. On-chip circuits include VIF, SIF, a video
processor, a chroma demodulator, and deflection drivers.
The self-adjusting signal processors support vertical field
scanning rates of both 50 and 60Hz, allowing the LA7837
and LA7838 vertical output drivers to maintain a constant
picture height.
The LA7681 replaces the LA7680’s G-Y output at pin 22
with a color contrast signal for input to a SECAM chroma
demodulator. This contrast signal is fixed at the maximum.
The LA7680/7681 is available in 48-pin shrink DIPs.
unit:mm
3149-DIP48S
48
13.8
0.25
15.24
4.25
3.8 5.1max
25
1
24
46.0
2.53
1.78
0.48
0.51min
Features
[LA7680, 7681]
1.05
• Minimized external components.
• 48-pin shrink DIP.
VIF/SIF
• High-gain VIF amplifier.
• Fast-response automatic gain control (AGC).
• No delay between audio input and output.
• Muting for both audio and video signals or for audio
alone.
Video processor
• On-chip two-dimensional differential circuit.
• Variable current transfer.
• 7MHz bandwidth.
Chroma demodulator
• PAL and NTSC system compatible.
• Optimized demodulation angles and ratios.
• High performance burst cleaning filter and ACC/killer
detector.
• On-chip tint circuit (NTSC only).
Deflection drivers
• Adjustment-free vertical or horizontal synchronization.
• Two-stage automatic frequency control.
• Adjustable separation sensitivity for vertical synchronization.
• Fixed picture height for both PAL and NTSC.
• Fixed picture height.
SANYO : DIP48S
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
30801TN (KT)/32593TS/6290TA KI 8-6402, 6403 No.3343–1/10
