ROHM BA7644AN Datasheet
1
Multimedia ICs
Video signal switcher
BA7644AN
The BA7644AN is a four-channel analog multiplexer with mute, designed for use in video cassette recorders. It features a wide dynamic range, and wide operating frequency range, and is suitable for switching audio and video signals.
•
Applications
VCR, TV and audio signal switching
•
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 (3.5V
P-P Typ.).
7) High input impedance (20kΩ Typ.).
8) Low interchannel crosstalk
( – 65dB Typ., f = 4.43MHz).
•
Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Unit
V
CC 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.
•
Block diagram
1
IN1
2
CTLA3CTLB
4
LOGIC
MUTE
IN2
5
CTLC
6
IN3
7
VCC
8
IN4
9
GND
10
VOUT
•
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".
2
Multimedia ICs BA7644AN
•
Equivalent circuits
100µA 100µA
Vcc
IN
D2
Q1Q2R2
R1
100
D1
20k
CLAMP INPUT
2mA
Vcc
Q1
D1
OUT
D2
OUTPUT
Output impedance 20Ω [Typ.]
∗
Output DC voltage 2.2V (VCC = 5V, Typ.)
∗
∗
Reference value
100 50k
20k
34k
Vcc
CTLA / B
R4
R1D2R2
R3
Q3
CTLA / CTLB
100 45k
30k
29k
Vcc
CTLC
R4
R1D2R2
R3
Q3
CTLC
Input bias current 1µA (Typ.)
∗
Input bias voltage 3.68V (VCC = 5V, Typ.)
∗
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