BA7755A Rohm, BA7755A Datasheet

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BA7755A

Manufacturer Part Number
BA7755A
Description
High-voltage audio head selection switch
Manufacturer
Rohm
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
BA7755A
Quantity:
5 510
Part Number:
BA7755A
Manufacturer:
ROHM/罗姆
Quantity:
20 000
Part Number:
BA7755AF-E1
Manufacturer:
ROHM/罗姆
Quantity:
20 000
Part Number:
BA7755AF-E2
Manufacturer:
ROHM/罗姆
Quantity:
20 000
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 ± 65V
AC120V
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.
Video cassette recorders and tape decks
1) High withstanding voltage ( ± 65V
2) Circuits for either current control or voltage control
3) Compact SIP 5pin or SOP 8pin package.
Applications
Features
Block diagram
High-voltage audio head selection
switch
BA7755A / BA7755AF
Video ICs
AC120V
are provided on the chip.
P-P
P-P
(f = 70Hz).
(Min.), f = 70Hz).
BA7755A
BA7755AF
DC
(Min.),
V
1
CC
N.C.
V
8
1
CC
SW
2
HEAD
SWITCH
N.C.
7
2
GND CTRL2 CTRL1
3
GND CTRL2
N.C.
6
3
CTRL1
4
5
4
5
DC
or
1

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BA7755A Summary of contents

Page 1

... 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 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. • ...

Page 2

... I CTRL1 (ON) — — CTRL1 (OFF) V 1.70 2.15 2.60 TH1 21.0 31.0 42.0 R CTRL2 BA7755A / BA7755AF Unit Unit V = 9V) CC Unit Conditions Pin4 “L” or “OPEN” A Pin5 “OPEN” Pin 4 “L” or “OPEN” mA Pin 5 control current: 200 A Pin 4 “L” or “OPEN” ...

Page 3

... Fig. 2 (3) When used with the BA7751ALS BA7755A Head V CC BA7751ALS 20 REC / EE Fig SW2 BA7755A / BA7755AF SW1 SW2 Between pins 2 and 3 OFF High impedance OFF ON Low impedance OFF High impedance ON ON High impedance V 1.4 [V] CC – – 200 [ A] When (approx) R 28k ...

Page 4

... BIAS BIAS SW5 ALC DET. ALC VR. R SW1 LINE P PB 40dB SW7 18k + + + PB IN REC OUT BA7755A HEAD Fig.4 BA7755AF 0.2 0.3 0.1 BA7755A / BA7755AF PB REC EP MUTE MUTE OFF + + + BUFF. SW4 REC SW3 SW8 51k 3.9mH 470 + VR2 AC BIAS Note: ...

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