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BA7746S Datasheet(Fiches technique) 5 Page - Rohm

Numéro de pièce BA7746S
Description  VCR Hi-Fi audio signal REC / PB amplifier
Télécharger  12 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
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 5 page
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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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