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LA75521VA Datasheet(PDF) 10 Page - Sanyo Semicon Device

Part No. LA75521VA
Description  IF Signal Processing (VIFSIF) IC that Supports the PAL Video Standard for TV Sets and VCRs
Download  13 Pages
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Maker  SANYO [Sanyo Semicon Device]
Homepage  https://www.sanyo-av.com/us/
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LA75521VA Datasheet(HTML) 10 Page - Sanyo Semicon Device

 
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LA75521VA
No.A1004-10/13
Continued from preceding page.
Pin
No.
Pin name
Function
Equivalent Circuit
12
AFT OUTPUT
AFT output pin. The AFT center voltage is
generated by an external bleeder resistor. The
AFT gain is increased by increasing the resistance
of this external bleeder resistor.
For the resistor we recommend a resistance equal
to or greater than 22k
Ω.
For the filter C1 we recommend a capacitance of
0.1
μF.
13
1st SIF INPUT
First SIF input pin. A DC cut capacitor must be
used in the input circuit.
(a) If a SAW filter is used :
The first SIF sensitivity can be increased by
inserting an inductor between the SAW filter
and the IC to neutralize the SAW filter output
capacitance and the IC input capacitance.
(b) When used in an intercarrier system :
Connect this pin to ground.
14
RF AGC OUTPUT
RF AGC output pin. This output controls the tuner
RF AGC.
This is the open collector output and a protective
200
Ω resistor is inserted. Determine the external
bleeder resistor value in accordance with the
specifications of the tuner.
15
AFT MUTE LEVEL
A switch pin for selecting the mute potential when
muting is applied to the AFT due to PLL unlock,
etc. At the same time, it is used to control the trap
point shift of the audio trap (in the B/G mode).
When the frequency characteristics of the video
band are to be made as flat as possible with the
split input, the trap can be shifted to the high range
although the attenuation of the sound carrier will
drop. Therefore, when used in combination with
the SAW filter, verify that the level is high enough
before use.
Voltage
ATF MUTE
Voltage
TRAP SHIFT
VCC to 4V
VCC/2
0
4V to 2.5V
VCC/2
+250kHz
2.5V to 1V
VCC
0
1V to GND
VCC
+250kHz
* When VCC = 5 V
Continued on next page.
12
500
Ω
500
Ω
R
R
C1
13
2k
Ω
14
200
Ω
VCC
15
66k
Ω
34k
Ω


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