LA70020 Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LA70020

Recording/Playback Amplifier for VHS VCRs

SANYO -> Panasonic 

Switching Video Trick Mode with Pin 7

LA70020, 70020M

GND < pin 7 level - DC < 1.0 V: TRICK2

1.0 V < pin 7 level - DC < 3.0 V: NORMAL

3.0 V < pin 7 level - DC < 5.0 V: TRICK2

NORMAL Mode

Two channels selected with pin 9 (EP/SP): ON

Envelope comparator: OFF

TRICK Modes

All four channels: ON

Envelope comparator: OFF

Difference between TRICK1 and TRICK2 modes

TRICK1 is a special playback mode using the following path

Envelope comparator OUT (pin 8) → Servo (microcontroller) → Pin 3 (HA) → HA-SW

TRICK2 provides SP searching

Envelope comparator OUT → HA-SW

HA-SW (EP/SP mode switch): Pin 9

GND < pin 9 level - DC < 1.5 V: SP mode

1.5 V < pin 9 level - DC < 5 V: EP mode

Video Synchronization of HA Switching Timing during Playback with H-SYNC Signal

During playback, the LA70020’s video circuits synchronize the HA-SW switching timing shown in the following figure

with the H-SYNC signal from pin 11. (Other EP/SP switching takes place in real time.)

The hi-fi playback amplifier’s gain is approximately 2.4 dB higher in EP mode than in SP mode.

SP: 75.0 dB

EP: 77.4 dB

No. 5711-10/13

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