LA7583 datasheet(8/15 Pages) SANYO

tên linh kiện	LA7583

Giải thích chi tiết về linh kiện	IF Signal Processing Circuit (A2C PLL VIF SIF) for TVs and VCRs

PDF	15 Pages

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nhà sản xuất	SANYO [Sanyo Semicon Device]

Trang chủ	https://www.sanyo-av.com/us/

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8 / 15 page

Continued from preceding page.

No.

Symbol

Circuit Configuration

Description

IF AGC

Pin 4 is the 1st IFAGC filter pin. This filter

smoothes out the peaks detected in the

signal by the AGC detector, and generates

the AGC voltage. The 2nd AGC filter (lag

lead filter) is built in using filter technology.

The cutoff frequency is approximately

500 Hz.

AGC filter constants and AGC speed

Medium-speed AGC: R1 = 330 k

Ω

C1 = 0.1 µF

High-speed AGC:

R1 = 470 k

Ω

C1 = 0.056 µF

VIF INPUT

Pins 5 and 6 are the VIF amplifier input

pins. The VIF amplifier has three stages,

each of which uses a C cut, so when used

in conjunction with a SAW filter, DC cut by a

capacitor becomes unnecessary.

Ri = 1.1 k

Ω

Ci=3pF

1st SIF INPUT

Pin 9 is the 1st SIF input pin. Input is such

that DC cut must be performed using a

capacitor. When a SAW filter, etc. is used in

the input circuit, an L that is used to

neutralize the SAW filter output capacitance

and the IC input capacitance serves to

improve the 1st SIF sensitivity.

Continued on next page.

LA7583

No.5177-8/15

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