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ROHM Semiconductor |
Multimedia ICs
Video signal switcher
BA7603 / BA7603F
The BA7603 and BA7603F are switching ICs developed for use in VCRs. Each contains three two-channel analog
multi-plexers. The switches have sync-tip clamped inputs and are ideal for switching video signals.
•Applications
Video cassette recorders and televisions
•Features
1) Three 2-input / 1-output switches.
2) Sync-tip clamped inputs.
3) 5V power supply.
4) Low power consumption (62.5mW Typ.).
5) Excellent frequency characteristics
(10MHz, 0dB Typ.).
6) Wide dynamic range (2.9VP-P Typ.).
7) Fast switching speed (50ns Typ.).
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Power supply voltage
VCC
Power dissipation
Pd
Operating temperature
Topr
Storage temperature
Tstg
∗ Reduced by 5.0mW for each increase in Ta of 1°C over 25°C.
Limits
9
500∗
– 40 ~ + 85
– 55 ~ + 125
Unit
V
mW
°C
°C
•Block diagram
IN2a 1
CTLa 2
OUTa 3
GND 4
OUTb 5
OUTc 6
CTLc 7
IN2c 8
16 IN1a
15 GND
14 IN2b
13 VCC
12 CTLb
11 IN1b
10 GND
9 IN1c
CTL Output
L IN 2
H IN 1
SWa, SWb, SWc: pedestal-clamped input
1
Multimedia ICs
•Equivalent circuits
SWa, SWb, SWc
IN
BA7603 / BA7603F
R3
22k
Q5 R7
100
R2
4k Q6
I2
0.3mA
R12
200
Q9
R16
200
VCC
Q3
Q2
Q1
R1
1k
R9
200 Q7 Q8
R10 R11
100 100
Q10 Q11
R15
200
R13 R14
100 100
R8 I1 R17 I4
25k
0.6mA
12k
0.6mA
Q12
I5
1mA
OUT
CTL
CTL
R1
50k
R2
200
Q1
VCC
R6
25k
I2
0.6mA
Q6
Q3 Q5
I1
0.25mA
Q2 Q4
R3 R4
400 400
R5
25k
I3
0.06mA
2
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