LA7567NM 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA7567NM

TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support

SANYO -> Panasonic 

Continued from preceding page.

Pin No.

Pin

LA7567N, 7567NM

Description

• Output for the video signal that includes the SIF carrier.

10

Composite video output

A resistor must be inserted between pin 10 and ground to

acquire adequate drive capability.

R ≥ 300 Ω

Equivalent circuit

11

12

VCO tank

• VCO tank circuit used for video signal detection.

See the coil specifications provided separately for details

on the tank circuit. This VCO is a vector synthesis VCO.

• AFT output. 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.

13

AFT OUTPUT

However, this resistor must not exceed 390 kΩ.

This circuit includes a control function that controls the AFT

voltage to naturally approach the center voltage during

weak field reception.

• RF AGC output. This output controls the tuner RF AGC.

A protective 100-Ω resistor is inserted in series with the

14

RF AGC OUTPUT

open collector output. Determine the external bleeder

resistor value in accordance with the specifications of the

tuner.

• First SIF input. A DC cut capacitor must be used in the

input circuit.

• If a SAW filter is used:

The first SIF sensitivity can be increased by inserting an

15

1st SIF INPUT

inductor between the SAW filter and the IC to neutralize the

SAW filter output capacitance and the IC input

capacitance.

• When used in an intercarrier system:

This pin (pin 15) may be left open.

Continued on next page.

No. 5765-10/14

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