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BA7755A

Rohm
Part Number BA7755A
Manufacturer Rohm
Description High-voltage audio head selection switch
Published Mar 26, 2005
Detailed Description Video ICs High-voltage audio head selection switch BA7755A / BA7755AF The standard audio circuits of video cassette rec...
Datasheet PDF File BA7755A PDF File

BA7755A
BA7755A

Overview
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 recording 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 circuits that employ either method.
By combining the BA7755A or BA7755AF with the BA7751ALS recording / playback amplifier, it is possible to construct 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 ( ± 65V DC (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 BA7755A 1 VCC 2 SW 3 4 5 GND CTRL2 CTRL1 BA7755AF CTRL1 8 7 6 5 N.
C.
N.
C.
N.
C.
1 2 3 4 VCC HEAD GND CTRL2 SWITCH 1 Video ICs BA7755A / BA7755AF •Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Breakdown voltage of switch (pin 2) Symbol VCC Pd Topr Tstg BVCC2 Limits 15 400∗1 – 10 ~ + 65 – 55 ~ + 125 ± 65 Unit V mW °C °C V ∗ Reduced by 4mW for each increase in Ta of 1°C over 25°C.
•Recommended operating conditions (Ta = 25°C) Parameter Operating voltage Symbol VCC Min.
4 Typ.
9 Max.
13 Unit V •Electrical characteristics (unless otherwise noted, Ta = 25°C and V Parameter Supply current Supply current Switch-on resistance Switch leakage current Switch ...


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