Overview
The LA75691 is a PAL/NTSC multichannel audio
VIF/SIF signal-processing IC that makes the minimum
number of adjustments possible. The system is designed
so that VCO adjustment makes AFT adjustment
unnecessary, thus simplifying the adjustment steps in end-
product manufacturing. PLL detection is adopted in the
FM detector, allowing the LA75691 to support
multichannel detection for the audio signal. In addition, it
also incorporates a buzz canceller that suppresses Nyquist
buzz for improved audio quality.
Functions
[VIF Block]
PLL detector with minimum number of adjustments
AFT
Equalizer amplifier
RF AGC
[First SIF BLOCK]
First SIF detector
HPF
[SIF Block]
PLL-based FM detector
[Muting Block]
AV muting
Features
Excellent buzz and buzz/beating characteristics provided
by a PLL detection technique that includes a buzz
canceller.
The second IF AGC filter is built in.
No coils are used in the AFT and SIF circuits, making
them adjustment free.
Package Dimensions
unit: mm
3067-DIP24S
Monolithic Linear IC
90898RM (OT) No. 5734-1/13
SANYO: DIP24S
[LA75691]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
IF Signal-Processing IC for PAL/NTSC Multichannel
Audio TV and VCR Systems
LA75691
Ordering number : EN5734
Ambient temperature, Ta — °C
Allowable
power
dissipation,
Pd
max
—
W
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.