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LA7285M Datasheet(PDF) 6 Page - Sanyo Semicon Device

Part No. LA7285M
Description  VCR Audio Signal Recording and Playback Processor
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Maker  SANYO [Sanyo Semicon Device]
Homepage  http://www.ssdc-jp.com/eng/
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LA7285, 7285M
No.4091-6/7
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Unit (resistance:
Ω)
Inputs the Line Amplifier output
signal.
The ALC level is set by the resistors
R1 and R2.
Output inpedance
→ 50Ω (typ)
Inputs the recording signal from Line
Amplifier.
The recording current is set by the
resistors R1 and R2. A coupling
capacitor is unnecessary as pin 15 is
a zero baias input.
Used to adjust the high-region peaking
frequency during recording amplifier in
LP mode.
On resistance
→ 15Ω (typ)
Intput inpedance
→ 50Ω (typ)
Recording amplifier negative-
feedback input. Used to adjust the
high-region peaking frequency of the
recording amplifier with an L, C, R
network connected to ground.
Output inpedance
→ 40Ω (typ)
Ripple rejection is performed when
connected to GND through an
electrolytic capacitor for the filter.
VCC max=14V
VCC=8.5V to 12.75V
When the voltage on
pin 21 is 3.6V to 6.0V:EP;
when 1.8V to 2.6V:LP;
when 0V to 1.8V:SP
Switch On Pin Number
EP mode:4,5,16
LP mode:16
Inputs EE and RE signals.
The reference input is set by resistors
R1 and R2.The amplifier gain is fixed at
21.5 dB. In addition, because the input
impedance is as high as 110k
Ω, a
0.1
µF ceramic capacitor can be used
for the coupling capacitor on pin 12.
Internal
reference
Power supply of
each circuit block




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