LA7289 データシートの表示（PDF） - SANYO -> Panasonic

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LA7289

VCR Audio Signal Record and Playback Processor

SANYO -> Panasonic 

Continued from the preceding page.

Pin No.

5

Function

EQ AMP NFB

LA7289

Function description

Negative feedback for the EQ amplifier.

Internal circuit

6

EQ switch 1

7

EQ amplifier output

Switches the playback EQ amplifier

high-frequency voltage gain.

LP, SP → On

EP → Off

On resistance → 20 Ω (typical)

Output impedance → 50 Ω (typical)

8

Line amplifier playback input

9

ALC FILTER

10

Line amplifier tuner input

11

GND

Inputs the playback signal from

the EP amplifier. Since pin 8 has

the high input impedance of 120 kΩ,

a 0.1 µF ceramic capacitor can be used

as the coupling capacitor.

Detection is performed using the

capacitor connected between this pin

and ground. The attack and recovery times

are determined by the time constant of

the RC circuit connected to this pin.

Inputs the EE and record signal.

A06826

The reference input is set by the resistors

R1 and R2. The amplifier gain is fixed

at 21.0 dB. Since pin 10 has the high input

impedance of 120 kΩ, a 0.1 µF ceramic

capacitor can be used as the coupling

capacitor.

Ground for all the circuit blocks except

the pin 2 head switching circuit and the

EQ amplifier.

A06820

A06821

A06822

A06823

A06824

A06825

Continued on the next page.

No. 5642-8/11

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