LA7285 データシートの表示（PDF） - SANYO -> Panasonic

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LA7285

VCR Audio Signal Recording and Playback Processor

SANYO -> Panasonic 

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Pin No.

Function name

12

LINE input

13

ALC input wave detection

14

LINE AMP output

15

REC AMP input

16

LP mode switch

17

REC AMP NFB

18

REC AMP output

LA7285, 7285M

Unit (resistance:Ω)

Internal circuit for pin

Internal

reference

Description of function

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 110kΩ, a

0.1µF ceramic capacitor can be used

for the coupling capacitor on pin 12.

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)

19

Ripple filter

20

Supply voltage (VCC)

21

EP/LP/SP Control

Power supply of

each circuit block

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

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