ROHM BA7625 Datasheet
1
Multimedia ICs
Video signal switcher for AV amplifiers
BA7625
The BA7625 is a video signal switch that contains two five-channel analog multiplexers and wide-band 6dB amplifiers.It designed for use in video cassette recorders. By simply adding transistor buffers to the outputs,it is possible to
construct arecord / playback switch for two record / playback VCRs, and three video playback machines (eg.laser
disk players). Input switching and VCR record switching can be done independently. The BA7625 has sync-tip clamp
inputs which are ideal for switching video signals.
•
Applications
AV amplifiers and video selectors
•
Features
1) 5-input / 3-output switches.
2) Sync-tip clamp inputs.
3) Built-in 6dB amplifiers.
4) 5V supply voltage.
•
Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits Unit
V
CC 9V
500
∗
mW
Topr °C
Tstg °C
Pd
– 25 ~ + 70
– 55 ~ + 125
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
∗
Reduced by 5mW for each increase in Ta of 1°C over 25°C.
2
Multimedia ICs BA7625
•
Block diagram
IN5
1IN1
CTL A
V
OUT1
V
CC
IN2
CTL B
V
OUT 2
GND
GND
IN4
CTL E
CTL D
16
15
14
13
12
11
10
9
2
3
4
5
6
7
8
IN3
CTL C
logic
logic
6dB
6dB
Monitor OUT
•
Truth table
CDE VOUT2
LL
∗
IN1
HL
∗
—
LH
∗
IN3
H H L IN4
H H H IN5
CDE VOUT1
LL
∗
—
HL
∗
IN2
LH
∗
IN3
H H L IN4
H H H IN5
ABE
LL
∗
IN1
HL
∗
IN2
LH
∗
IN3
H H L IN4
HHH IN5
Note 1: ∗ indicates "don't care" (H or L).
Monitor OUT
3
Multimedia ICs BA7625
•
Equivalent input / output circuits
Vcc
Q1
V1
+
2.7V
I1
100µA
Q2
Q3
R1
200 200
R2
V
IN
Vcc
Q1
Q2
58kO158k
R2 R3
38k
R4
R1
2k
IN
Vcc
MONOUT
17k
R1
Q1
Q2
Q3
Q5
Q4
100
R2
Vcc VOUT1
VOUT
48k
R1I1
O1
DN
25BUR
I2
600µA
Q2
Q4
1.4mA
1.4mA
Q3
100
R2
Q1
1VP-P
DC 2.0V
2VP-P
DC 0.5V
3.3V
High level
Vcc = 5.0V
2.1V
Low level
2VP-P
DC 0.5V
IN1 ~ IN5
CTLA ~ CTLE
Monitor OUT
V
OUT1 , VOUT2
Input circuit Waveform
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