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Multimedia ICs
Video signal switcher
BA7644AN
The BA7644AN is a four-channel analog multiplexer with mute, designed for use in video cassette recorders. It fea-
tures a wide dynamic range, and wide operating frequency range, and is suitable for switching audio and video sig-
nals.
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Applications
VCR, TV and audio signal switching
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Features
1) 4-input / 1-output switches.
2) Built-in mute.
3) Wide operating supply voltage range
(4.5V to 13.0V).
4) Low power consumption (48mW Typ.).
5) Excellent frequency characteristics
(10MHz, 0dB Typ.).
6) Wide dynamic range (3.5VP-P Typ.).
7) High input impedance (20kW Typ.).
8) Low interchannel crosstalk
( – 65dB Typ., f = 4.43MHz).
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Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Unit
VCC 13.5 V
850
*
mW
°C
°C
Limits
Pd
Topr
Tstg
– 25 ~ + 75
– 55 ~ + 125
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
*
Reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
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Block diagram
1
IN1
2
CTLA
3
CTLB
4
LOGIC
MUTE
IN2
5
CTLC
6
IN3
7
V
CC
8
IN4
9
GND
10
V
OUT
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Truth table
OUT
L (OPEN) L (OPEN) L (OPEN) IN1
L (OPEN) H L (OPEN) IN2
H L (OPEN) L (OPEN) IN3
H H L (OPEN) IN4
*

*
HMUTE
CTL - A CTL - B CTL - C
*
Either "L (open)" or "H".