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| LA70001 Datasheet, PDF (7/8 Pages) Sanyo Semicon Device – Record/Playback Amplifiers for VHS Format VCRs | |||
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LA70001, 70001M
Record Amplifier Gain Control
The LA70001 achieves an adjustment-free record current by adding an AGC circuit in the record amplifier block. The
record current can be modified using the following method.
⢠Record current adjustment 2: When left open.
Pin 12 DC level is set to 1/2 VCC (approximately 2.5 V) by an internal bias, and the record current is determined by
Ro1.
Design value: When Ro1 is 1.5 kâ¦, the record current will be 12.7 mA per channel.
⢠Record current adjustment 2: When used.
The gain can be varied by â6.0 dB to +3.5 dB relative to the value set by Ro1 by applying a control DC voltage of
between 1 and 4 V to pin 12.
Record current (mAp-p) design value
Note: The technique shown in the figure below can be used to apply a DC level to pin 12. This allows a control voltage of between 1 and 4 V to be applied.
No. 5709-7/8
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