LA70011 Ver la hoja de datos (PDF) - SANYO -> Panasonic

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LA70011

Recording/Playback Amplifier for VHS VCRs

SANYO -> Panasonic 

LA70011, 70011M

Envelope Detector Characteristic: Pin 6

The LA70011 includes a built-in playback signal envelope detector circuit for use in automating tracking adjustment.

Envelope detector voltage characteristic

Pin 6 level - detector

DC level (V)

EP, with 18kΩ resistor on pin 6

SP, with 18kΩ resistor on pin 6

Pin 7 level - playback output level (mVp-p)

REC AMP Gain Control

The LA70011 eliminates recording current adjustment by adding an automatic gain control circuit to the recording

amplifier. It is also possible to change the recording current with the following methods.

REC-CURRENT-ADJ2 Open

The internal bias forces the DC level at pin 12 to 1/2 VCC (that is, approximately 2.5 V), and RO1 determines the

recording current.

Design values

RO1 = 1.5 kΩ = 16.0 mA (SP) (per channel)

RO1 = 1.5 kΩ =12.7 mA (EP)

REC-CURRENT-ADJ2 Used

Applying a DC control voltage between 1 and 4 V to pin 12 adjusts the figure determined by RO1 between –6.0 dB and

+3.5 dB.

No. 5710-9/11

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