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LA75521VA Datasheet(PDF) 9 Page - Sanyo Semicon Device

Part No. LA75521VA
Description  IF Signal Processing (VIFSIF) IC that Supports the PAL Video Standard for TV Sets and VCRs
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA75521VA Datasheet(HTML) 9 Page - Sanyo Semicon Device

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LA75521VA
No.A1004-9/13
Continued from preceding page.
Pin
No.
Pin name
Function
Equivalent Circuit
7
9
SIF SYSTEM SW A
SIF SYSTEM SW B
SIF system selection switch pins. Combining the
settings of these two pins supports four systems.
In M/N mode, the audio output level is increased
by 6dB.
The internal trap is also linked to these switches.
The truth-values are as follows.
Pin 7
Pin 9
MODE
H
H
M
H
L
I
L
H
B/G
L
L
D/K
8
APC FILTER
PLL APC filter connection pin. The APC count is
switched internally in the IC.
The VCO is normally controlled by route A.
When unlocked and during weak field reception,
the VCO is controlled by route B and the loop gain
is increased.
For this APC filter we recommend a resistor of 51
Ω
and capacitor of 0.47
μF.
The buzz characteristics can be improved by
connecting a capacitor of 100pF or so between
pins 5 and 8.
10
VIF FREQUENCY SW
Switch pin for selecting the IF frequency
When this pin is open, 1/2VCC exists.
VCC: 39.5MHz
Open: 38.9MHz
GND: 38.0MHz
11
REFERENCE CP
INPUT
Reference signal input pin necessary for adjusting
the internal sound carrier trap, AFT, etc.
Either 4.0 or 4.43MHz can be selected. Use the
configuration shown in example 1 when using
4.43MHz and configuration shown in example 2
when using 4.0MHz.
Since no oscillator can be configured simply by
connecting the X’tal resonator to pin 11, input the
reference signal from an external source without
fail.
Continued on next page.
7
9
50k
Ω
80k
Ω
30k
Ω
1k
Ω
1k
Ω
50k
Ω
80k
Ω
30k
Ω
1k
Ω
1k
Ω
A
B
8
FROM
APC
DET
A
B
1k
Ω 1kΩ
10
11k
Ω
50k
Ω
50k
Ω
11
200k
Ω
4.43M
11
270k
Ω
4.0MHz
11
Example 1
Example 2
1000pF
1000pF


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