1
Multimedia ICs
Video signal switcher
BA7605N
The BA7605N is a switching IC developed for use in VCRs. It has two two-channel analog multiplexers with a large
dynamic range, and wide operating frequency range. The switch has sync-tip clamped inputs and is ideal for switch-
ing video signals.
Applications
Video cassette recorders and televisions
Features
1) Two 2-input / 1-output switches.
2) Sync-tip clamped inputs.
3) 5V power supply.
4) Low power consumption (42mW Typ.).
5) Excellent frequency characteristics
(10MHz, 0dB Typ.).
6) Wide dynamic range (2.9V
P-P
Typ.).
7) Fast switching speed (50ns Typ.).
Absolute maximum ratings (Ta = 25C)
Parameter
Symbol
Limits
Unit
V
CC
9
V
500
mW
Topr
C
Tstg
55 ~ + 125
C
40 ~ + 85
Pd
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Reduced by 5.0mW for each increase in Ta of 1
C over 25
C.
Block diagram
S
a
S
b
1
IN1a
2
V
CC
3
IN2a
4
CTLa
5
OUTa
6
OUTb
7
CTLb
8
IN2b
9
GND
10
IN1b
L
IN 2
H
IN 1
Sa, Sb: clamp inputs
CTL
Output
2
Multimedia ICs
BA7605N
Equivalent circuits
R3
22k
R8
25k
R17
12k
I1
0.6mA
I2
0.3mA
I4
0.6mA
I5
1mA
R7
100
R10
100
R11
100
R13
100
R14
100
R9
200
R12
200
R16
200
R15
200
R2
4k
R1
1k
Q5
Q6
Q7
Q8
Q10 Q11
Q12
Q9
Q3
Q2
Q1
OUT
V
CC
IN
Sa,Sb
CTL
R3
400
R4
400
R5
25k
R2
200
Q3
Q1
Q5
Q6
Q2
Q4
CTL
R6
25k
R1
50k
V
CC
I2
0.6mA
I1
0.25mA
I3
0.06mA
3
Multimedia ICs
BA7605N
Electrical characteristics (unless otherwise noted, Ta = 25C and V
CC
= 5V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Conditions
V
CC
4.5
5.0
5.5
V
--
I
CC
--
8.4
10.0
mA
--
V
om
2.6
2.9
--
G
V
0.5
0
dB
--
65
--
dB
G
f
3
0
dB
V
TH
2.0
2.5
3.0
V
--
10MHz / 1MHz, V
IN
= 1V
P-P
f = 4.43MHz, V
IN
= 1V
P-P
f = 1MHz, V
IN
= 1V
P-P
f = 1kHz, THD = 0.5%
0.5
1
C
T
V
P-P
Operating voltage
Supply current
Maximum output level
Voltage gain
Interchannel crosstalk
Frequency characteristics
CTL pin switch level
Note: Refer to the measurement circuit given in Fig. 1.
Reference data
Pin DC voltages (reference values)
Pin No.
DC voltage
DC voltage
Pin No.
1
2.05
6
0.65
2
5.00
7
4.91
3
2.05
8
2.05
4
4.91
9
0
5
0.65
10
2.05
Units: Vdc
Electrical characteristics
Parameter
0.49
0.65
0.80
Vdc
--
1.7M
--
--
30
--
Min.
Typ.
Max.
Unit
Sync tip clamp level
Input impedance (with clamp)
Output impedance
The input coupling capacitor values should be 0.1
F to 1
F.
4
Multimedia ICs
BA7605N
Measurment circuit
1
2
3
4
5
6
7
8
9
10
V
IN1a
S
1a
223
47
OSC
R
1
2
3
~
V
IN1b
S
1b
OSC
R
105
105
1
2
3
V
IN2a
S
2a
OSC
R
1
2
3
~
~
~
V
IN2b
S
2b
OSC
R
R = 75
105
105
105
105
105
105
2
3
1
V
V
CC
V
CC
S
3a
1
2
3
S
3b
1
2
3
V
CC
A1
V
Fig.1
5
Multimedia ICs
BA7605N
S
1a
S
2a
S
3a
S
1b
S
2b
S
3b
I
CC
2
2
2
2
2
2
I
N1a
I
N2a
I
N1b
I
N2b
V
om
V
om
V
om
V
om
3
2
2
2
2
3
2
2
2
3
2
2
2
2
3
2
2
2
2
3
2
2
2
3
I
N1a
I
N2a
I
N1b
I
N2b
G
V
G
V
G
V
G
v
3
2
2
2
2
3
2
2
2
3
2
2
2
2
3
2
2
2
2
3
2
2
2
3
I
N1a
I
N2a
I
N1b
I
N2b
C
T
C
T
C
T
C
T
2
3
2
2
3
2
2
2
2
3
2
2
2
2
2
3
2
2
3
2
2
2
2
3
I
N1a
I
N2a
I
N1b
I
N2b
G
f
G
f
G
f
G
f
3
2
2
2
2
3
2
2
2
3
2
2
2
2
3
2
2
2
2
3
2
2
2
3
CTLa
CTLb
V
TH
V
TH
3
2
2
2
1
2
2
3
2
2
2
1
Note 1
Ammeter
Note 2
Note 3
Note 4
Note 5
Parameter
Symbol
Switch settings
Measurement
method
Current dissipation
Maximum
output level
Voltage
gain
Inter-
channel
crosstalk
Frequency
character-
istic
CTL pin
switching level
Note 1: Connect a distortion meter to the output, and input a f = 1kHz sine wave. Adjust the output level until the output
distortion is 0.5%. This output voltage at this time is the maximum output level V
om
(V
P-P
).
Note 2: Input a 1V
P-P
, 1MHz sine wave. The voltage gain is given by G
V
= 20 log (V
OUT
/ V
IN
).
Note 3: Input a 1V
P-P
, 4.43MHz sine wave. The interchannel crosstalk is given by C
T
= 20 log (V
OUT
/ V
IN
).
Note 4: Input 1V
P-P
, 1MHz and 10MHz sine waves.
The frequency characteristic is given by G
f
= 20 log (V
OUT
(f = 10MHz) / V
OUT
(f = 1MHz)).
Note 5: Input a 1V
P-P
, 1MHz sine wave. Reduce the CTL pin voltage from V
CC
.
The CTL pin switching level (V
TH
) is the CTL pin voltage at which the V
OUT
level drops below 20mV
P-P
.
Measurement conditions
External dimensions (Units: mm)
SIP10
2.8
0.2
25.2
0.2
10.5
0.5
0.6
1.3
10
2.54
3.5
0.5
1
5.8
0.2
1.2
0.3
0.1
0.8
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