LA7566 View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
Manufacturer
LA7566
SANYO -> Panasonic
LA7566 Datasheet PDF : 11 Pages
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Continued from preceding page.
Pin No.
Symbol
LA7566
Pin function
• Output for the video signal that includes the SIF carrier.
18
COMP OUT
A resistor must be inserted between pin 18 and ground to
acquire an adequate drive capability.
R ≥ 470 Ω
Equivalent circuit
• First SIF output
19
1st SIF OUT
The signal output from this pin is passed through a bandpass
filter and input to the SIF circuit. This is an emitter-follower
output.
• The FM detector signal-to-noise ratio can be improved by
inserting a filter in the FM detector bias line.
C1 should have a value of 0.47 µF or greater, and 1 µF is
20
FM FILTER
recommended .
If the FM detector is not used, pin 20 must be connected to
ground through a 2-kΩ resistor. This stops the FM detector
VCO circuit.
• SIF inputs.
Four input pins are provided to support multi-side systems, and
a switching function is also included. Since buzzing and bass
beating can occur if interference signals, such as the video
signal or the chrominance signal, enter these pins, extra care
must be taken in designing the input circuit pattern layout. Note
that pin 24 also functions as the RF AGC adjustment pin. This
pin sets the tuner RF AGC operating point. Also, the FM output
and the video output can be muted at the same time by setting
this pin to the ground level.
SIF IN (4.5 MHz)
21
SIF IN (5.5 MHz)
22
SIF IN (6.0 MHz)
23
Switch
ABC
5.5 MHz 6.0 MHz 6.5 MHz 4.5 MHz
SIF IN (6.5 MHz)
HHH
q
24
RF AGC VR
HH L
HLH
q
q
HL L
q
L HH
q
q
q
LLL
q
q
q
q
LHL
q
q
L LH
q
q
No. 5764-9/11
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