LA75675M-S Datasheet, PDF (7/13 Pages) Sanyo Semicon Device – VIF/SIF IF Signal-Processing Circuit that Supports NTSC Intercarrier for TV and VCR Products

Pin Functions
Pin No.
Pin
LA75675M-S
Function
Equivalent circuit
SIF input
The input impedance is about 1 kΩ.
Since interference signals* entering this input can
result in buzzing and beat signals, the pattern layout
1
SIF input
for the signal input to this pin must be designed
carefully.
*: Signals that can interfere with audio include video
and chrominance signals. Thus the VIF carrier
signal can cause interference.
1 kΩ
1 kΩ
1 kΩ
1
A12620
4.2 V
The FM detector signal-to-noise ratio can be improved
by inserting a filter in the FM detector bias line.
C1 must be 0.47 µF or higher, and we recommend
2
FM power supply filter 1 µF.
If the FM detector is not used, a 2 kΩ resistor must be
inserted between pin 2 and ground. This stops the FM
detector VCO circuit.
10 kΩ
4 kΩ
2
C1
TO VCO BIAS
14 kΩ
A12621
Outputs the intercarrier detector output that has been
3
SIF out
passed through a high-pass filter.
(4.5 MHz output)
4
NC
This pin should be left open.
5
V_CC
Use lines that are as short as possible for V_CC/ground
decoupling.
200 Ω
3
A12622
Continued on next page.
No. 6276-7/13