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.

12

Function

Line amplifier line input

13

ALC detector input

14

Line amplifier output

LA7289

Function description

Inputs the EE and record signals.

A06828

The reference input is set by the resistors

R1 and R2. The amplifier gain is fixed at

21.0 dB. Since pin 12 has the high input

impedance of 120 kΩ, a 0.1 µF ceramic

capacitor can be used as the coupling

capacitor.

A06830

Inputs the line amplifier output signal.

The ALC level is determined by

the resistors R1 and R2.

Output impedance → 50 Ω (typical)

Internal circuit

A06827

A06829

15

Record amplifier input

16

EP/LP/SP control

17

PB/LINE/TUNER control

Inputs the record signal from the line

amplifier.

A06833

The record current is set by the resistors

R1 and R2. Since pin 15 has the high input

impedance of 120 kΩ, a 0.1 µF ceramic

capacitor can be used as the coupling

capacitor.

If the pin 16 voltage is:

3.0 to 6.0 V: EP mode

1.8 to 2.6 V: LP mode

0.0 to 0.8 V: SP mode.

Switch on state pin numbers:

REC PB

EP 24 24

LP 24, 6 6

SP 6

6

If the pin 17 voltage is:

3.6 to 6.0 V: PB mode

1.8 to 2.6 V: LINE mode

0.0 to 1.0 V: TUNER mode.

A06831

A06832

A06834

A06835

Continued on the next page.

No. 5642-9/11

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