LA75521VA 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA75521VA

IF Signal Processing (VIF+SIF) IC that Supports the PAL Video Standard for TV Sets and VCRs

SANYO -> Panasonic 

Pin Functions

Pin

Pin name

No.

1

DE-EMPHASIS C

LA75521VA

Function

De-emphasis capacitor connection pin

This is used to switch the equivalent resistance

(5kΩ or 7.5kΩ) internally in the IC to select the

time constant.

This switching is linked to the SIF input switch.

To disable de-emphasis, disconnect the capacitor.

Connection of an external capacitance of 0.01μF

enables switching between 50 and 75μs.

When the FM detector circuit is not to be used, the

FM VCO can be stopped by connecting it to

ground with a resistor of 1kΩ or less.

Equivalent Circuit

4kΩ

1

0.01μF

2

SIF AGC FILTER AGC filter pin for SIF carrier

0.01μF is recommended for C1.

2kΩ

2

C1

3

FM PLL FILTER

PLL filter pin of FM detector

This is used to configure an external lag lead filter.

Example: Connect 330pF in parallel with the filter

(0.033μF + 3.3kΩ).

3

0.033μF

3.3kΩ

330pF

4

VCC

5

EQ OUT

6

EQ FILTER

Power supply

Equalizer circuit. This circuit is used to correct the

video signal frequency characteristics.

Notes on equalizer amplifier design

• The equalizer amplifier is designed as a voltage

follower amplifier with a gain of about 0 dB. When

used for frequency characteristics correction, a

capacitor, inductor, and resistor must be

connected in series between pin 6 and ground.

Equalizer

amplifier

gain

AV

=

R1

Z

+

1

R1 is the IC internal resistance, and is 1kΩ. In the

application design, simply select Z to correspond

to the desired characteristics. However, since the

EQ amplifier gain will be maximum at the

resonant point defined by Z, care is required to

assure that distortion does not occur.

8kΩ

3

2kΩ

R1:1kΩ

5

6

C

L =Z

R

Continued on next page.

No.A1004-8/13

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