LA7415 Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LA7415

VHS VCR Playback Head and Record Amplifiers

SANYO -> Panasonic 

H.Sync input: pin 6

LA7415

If the pin 6 DC voltage is > 1.5 V: Currently the signal is in an

H.Sync period

*: Playback mode: Used for switching timing in SP search.

Record mode: Used as the record amplifier AGC synchronization block gate pulse.

(4) Playback trick mode switching: pin 2

If the pin 2 DC voltage is > 3.0 V: Trick 1

If the pin 2 DC voltage is < 1.0 V: Trick 2

If the pin 2 DC voltage is > 1.0 V and < 3.0 V: Normal

*: Normal mode: Two channels controlled (EP/SP) by pin 4: ON

Envelope comparator: OFF

In trick 1 and 2 modes: All 4 channels: ON

Envelope comparator: ON

*: The difference between trick 1 and trick 2 is that:

or

Trick1 Envelope comparator (pin 3) output → Servo (microcontroller)

→ Pin 4 HA →SP search is performed in the [HA switch] path.

Trick2 Envelope comparator output → SP search is performed in the [HA switch] path. (See the block diagram.)

HA SW (EP/SP mode switching): pin 4

If the pin 4 DC voltage is < 1.6 V: SP mode

If the pin 4 DC voltage is > 1.6 V: EP mode

*: H.Sync synchronization for HA switching:

The switching of the HA SW circuit show in the figure at the right

is synchronized with the H.Sync signal input to pin 6.

(Other EP/SP switching is performed in real time.)

Comp.OUT (pin 3)

If the EP envelope is > SP: High (4.0 V or higher)

If the EP envelope is < SP: Low (0.7 V or lower)

No. 5647-5/12

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