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 

Pin Function

Pin No.

Function name

1

Head switch1

(high withstand voltage)

2

EQ AMP input and

Head switch2

3

GND

4

EP mode switch1

5

EP mode switch2

6

EQ AMP NFB

LA7285, 7285M

Unit (resistance:Ω)

Internal circuit for pin

Description of function

EE, PB → off, REC → off

On resistance → 20Ω(typ)

Withstand voltage when off → ±45V

(f=80kHz)

Input impendance for playback signal

input from head → 80kΩ (typ)

EE, REC → on

PB → off

On resistance → 5Ω (typ)

GND for pin 1 head switch and

Equalizer Amplifier only

Use to change tape heads and

resonant frequency.

On resistance → 15Ω (typ)

Input impendance → 10kΩ (typ)

(EP mode)

Switches the Playback Equalizer

Amplifier high-region frequency

voltage gain.

On resitatance → 15kΩ (typ)

Input impedance → 10kΩ (typ)

(EP mode)

Equalizer Amplifier negative

feedback pin

7

EQ AMP output

8

LINE AMP PB input

9

ALC FILTER

10

TUNER input

11

GND

Internal

reference

Internal

reference

Inputs the playback signal from the

Equalizer Amplifier. Because the

input impedance is as high as 110KΩ,

a 0.1µF ceramic capacitor can be used

for the coupling capacitor on pin 8.

Wave detection is performed when

connected to GND through a

capacitor. In addition, the attack and

recovery time is set by C and R

time constants.

Inputs EE and REC signals.

The reference input is set by resistors

R1 and R2.

The amplifier gain is fixed at 21.5dB.

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 10.

GND for all circuit blocks except the

head switch and Equalizer Amplifier.

Continued to next page.

No.4091-5/7

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