LA7282 データシートの表示（PDF） - SANYO -> Panasonic

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LA7282

VCR Audio Signal Recording / Playback Processor

SANYO -> Panasonic 

Pin Functions

Pin No.

1

Function

Head Switch 1

(High voltage)

2

EQ AMP Input

and

Head Switch 2

3

GND

4

EP Switch 1

5

EP Switch 2

6

EQ AMP NFB

7

GND

8

EQ AMP Output

9

LINE AMP PB

Input

LA7282, 7282M

Unit (resistance : Ω)

Terminal Circuit

Description

EE, PB : on ; REC : off

On resistance : 10Ω, type.

With stand voltage during off : ±45V (f=80kHz)

Input playback signal to the head.

Input impedance : 130kΩ, typ.

EE, REC : on ; PB : off

Switch on resistance : 5Ω, typ.

An exclusive GND for pin 1 head switch 1, EQ AMP and playback EP switch.

Sets the tape head resonant frequency.

On resistance : 15Ω typ.

Input impedance : 120kΩ, typ. (playback EP mode)

Increases the voltage gain at higher frequencies by reducing negative feedback

amount of the PB EQ AMP.

On resistance : 15Ω, typ.

Input impedance : 12kΩ, typ. (playback EP mode)

Input of negative feedback of the EQ AMP to establish desired equalizing

characteristics.

Common return for all circuits except for EQ AMP and head switch 1.

Input PB signal to the EQ AMP. The input impedance of pin 9 is high (120kΩ)

and requires a small coupling capacitor of 0.1µF.

10 ALC FILTER

Connecting this pin to GND through a capacitor enables detection. The RC time

constant sets attack recovery time.

11 LINE AMP Audio

Input

12 ALC Detect Input

13 LINE AMP Output

14 REC AMP Input

Input EE, REC signal.

Select value of R1 and R2 so that the reference input

is at the shoulder of the ALC.

The amplifier gain should be set for 21.5dB.

The input impedance of pin 11 is high (120kΩ) and requires a small coupling

capacitor of 0.1µF.

Accepts the output signal of LINE amplifier.

The ALC level is determined by the voltage divider

consisting of R1 and R2.

Output impedance : 50Ω, typ.

Input recording signal from LINE AMP.

Input current is set by the divider consisting of R1 and

R2.

Pin 14 requires no coupling capacitor since REC AMP

is to operate at zero level and as inverting amplifier.

Continued on next page.

No.4040–5/7

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