BA7746S 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA7746S

VCR Hi-Fi audio signal REC / PB amplifier

ROHM Semiconductor 

Video ICs

Pin No.

Pin name, function and remarks

Voltage

〈REC AGC FILTER〉

• REC AGC filter.

13

• The attack characteristics of the recording amplifier

can be adjusted using the CR circuit.

REC: 0V

PB: 0V

• Reduce the CR circuit GND-side impedance to

improve the common-mode distortion.

BA7746S / BA7746FS

Circuit diagram

2k

2k

〈REC CURRENT SENSE〉

• Terminal for monitoring the recording current.

14

• Open emitter output.

• The REC AGC output current can be adjusted with

REC: 0.58V

PB: 0V

the R value.

e.g. 12Ω...48.2mAP-P, 15Ω...38.6mAP-P

15

〈REC OUT〉

14

• Recording amplifier output and head switch.

15

• Open collector output.

• The head switch turns on and off in accordance with

REC: 4.1V

PB: 0V

the REC / PB control signal

〈MAIN GND〉

16

• Earth for circuits other than the preamplifier.

GND

—

• Reference potential for the IC

〈PRE AC-FB ch1〉

• AC feedback terminal for the playback amplifier

17

(ch1).

REC: 0V

PB: 0.8V

• The high-frequency characteristics of the playback

amplifier can be adjusted with the R value

〈PRE IN ch1〉

• Input terminal for the playback amplifier (ch1).

• The low-frequency cutoff characteristics can be

adjusted with the value of the input coupling

18

capacitor.

REC: 0V

PB: 0.7V

• The frequency characteristics can be adjusted so

that it is flat with the L value of the rotary

transformer, and the external capacitor C (100pF

etc.).

4k

17

13k

18

5

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