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BA7746FS Datasheet(PDF) 5 Page - Rohm

Part # BA7746FS
Description  VCR Hi-Fi audio signal REC / PB amplifier
PDF  12 Pages
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BA7746FS Datasheet(HTML) 5 Page - Rohm

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5
Video ICs
BA7746S / BA7746FS
13
REC: 0V
PB: 0V
14
REC: 0.58V
PB: 0V
15
REC: 4.1V
PB: 0V
16
GND
—
17
REC: 0V
PB: 0.8V
18
REC: 0V
PB: 0.7V
Pin No.
Pin name, function and remarks
Voltage
Circuit diagram
〈REC AGC FILTER〉
•
REC AGC filter.
•
The attack characteristics of the recording amplifier
can be adjusted using the CR circuit.
•
Reduce the CR circuit GND-side impedance to
improve the common-mode distortion.
〈REC CURRENT SENSE〉
•
Terminal for monitoring the recording current.
•
Open emitter output.
•
The REC AGC output current can be adjusted with
the R value.
e.g. 12
Ω...48.2mAP-P, 15Ω...38.6mAP-P
〈REC OUT〉
•
Recording amplifier output and head switch.
•
Open collector output.
•
The head switch turns on and off in accordance with
the REC / PB control signal
〈MAIN GND〉
•
Earth for circuits other than the preamplifier.
•
Reference potential for the IC
〈PRE AC-FB ch1〉
•
AC feedback terminal for the playback amplifier
(ch1).
•
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
capacitor.
•
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.).
2k
2k
14
15
17
18
4k
13k



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