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LA70011 Datasheet(PDF) 9 Page - Sanyo Semicon Device

Part No. LA70011
Description  Recording/Playback Amplifier for VHS VCRs
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA70011 Datasheet(HTML) 9 Page - Sanyo Semicon Device

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Envelope Detector Characteristic: Pin 6
The LA70011 includes a built-in playback signal envelope detector circuit for use in automating tracking adjustment.
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
LA70011, 70011M
Pin 6 level - detector
DC level (V)
Pin 7 level - playback output level (mVp-p)
Envelope detector voltage characteristic
EP, with 18k
Ω resistor on pin 6
SP, with 18k
Ω resistor on pin 6


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