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BA7755 데이터시트(PDF) 1 Page - Rohm

부품명 BA7755
상세설명  High-voltage audio head selection switch
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1
Video ICs
High-voltage audio head selection
switch
BA7755A / BA7755AF
The standard audio circuits of video cassette recorders and the recording circuits of tape decks use AC bias record-
ing to record the audio signal onto the tape. This bias voltage is some tens of volts, and a high-capacity bias-side
switch is required to electronically switch the head when in playback or record mode.
The BA7755A and BA7755AF are high-voltage switching ICs designed to switch voltages as high as ± 65VDC or
AC120VP-P (f = 70Hz).
Two control systems, one for current control, and one for voltage control are provided, so the ICs can be used in cir-
cuits that employ either method.
By combining the BA7755A or BA7755AF with the BA7751ALS recording / playback amplifier, it is possible to con-
struct a compact recording / playback audio circuit. In addition, the BA7755A and BA7755AF are an excellent choice
for a wide variety of other high-voltage switching applications.
Applications
Video cassette recorders and tape decks
Features
1) High withstanding voltage ( ± 65VDC (Min.),
AC120VP-P (Min.), f = 70Hz).
2) Circuits for either current control or voltage control
are provided on the chip.
3) Compact SIP 5pin or SOP 8pin package.
Block diagram
BA7755AF
12345
SW
GND CTRL2 CTRL1
BA7755A
VCC
8765
1234
N.C.
N.C.
N.C.
HEAD
SWITCH
GND CTRL2
CTRL1
VCC


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