Rohm BA7645 Video signal switcher Datasheet

Multimedia ICs
Video signal switcher
BA7645N
The BA7645N is a four-channel analog multiplexer with mute, designed for use in video cassette recorders. It features a large dynamic range, and wide operating frequency range, and has sync-tip inputs which are ideal for switching video signals.
Applications
•Video
cassette recorders and televisions
•1)Features
4-input / 1-output switches.
6) Excellent frequency characteristics
(10MHz, 0dB Typ.).
7) Wide dynamic range (3.5VP-P Typ.).
8) Low interchannel crosstalk
( – 65dB Typ., f = 4.43MHz).
2) Built-in mute.
3) Sync-tip inputs.
4) Wide operating supply voltage range
(4.5V to 13.0V).
5) Low power consumption (48mW Typ.).
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limit
Unit
VCC
13.5
V
Pd
850∗
mW
Operating temperature
Topr
– 25 ~ + 75
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
Power supply voltage
Power dissipation
∗ Reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
•Block diagram
•Truth table
MUTE
LOGIC
CTLC
OUT
CTLA
CTLB
L (OPEN)
L (OPEN)
L (OPEN)
IN1
L (OPEN)
H
L (OPEN)
IN2
H
L (OPEN)
L (OPEN)
IN3
H
H
L (OPEN)
IN4
∗
∗
H
MUTE
6
7
8
9
10
IN4
GND
VOUT
CTLB
5
IN3
CTLA
4
VCC
3
IN2
2
CTLC
1
IN1
∗ Either "L (open)" or "H".
1
Multimedia ICs
BA7645N
IN
•Equivalent circuits
CLAMP INPUT
∗ Reference value
Input bias current
1µA [Typ.]∗
Input clamp voltage 2.1V [VCC = 5V,Typ.]∗
D1
OUTPUT
D2
Vcc
Vcc
Q1 R2
Q1
100
D1
Q2
0.8µA
OUT
Output impedance 20Ω [Typ.]∗
Output DC voltage 0.55V [VCC = 5V, Typ.]∗
100µA
2mA
D2
CTLA / CTLB
CTLC
Vcc
Vcc
R4
R1
R2
100
50k
CTLA / B
R4
20k
R3
Q3
R3
CC
= 5V)
Symbol
Min.
Typ.
Max.
Unit
Conditions
VCC
4.5
—
13.0
V
—
Supply current
ICC
—
9.5
14.5
mA
Maximum output level
Vom
3.0
3.5
—
VP-P
f = 1kHz, THD = 0.5%
Voltage gain
GV
– 0.5
+ 0.5
dB
f = 1MHz, VIN = 1.0VP-P
Interchannel crosstalk
CT
—
—
dB
f = 4.43MHz,
VIN = 1.0VP-P
Frequency characteristics
Cf
– 3.0
+ 1.0
dB
f = 10MHz / 1MHz,
VIN = 1.0VP-P
0
– 65
0
—
CTL pin switching level A
VTH-A
1.0
2.0
3.0
V
—
CTL pin switching level B
VTH-B
1.0
2.0
3.0
V
—
CTL pin switching level C
VTH-C
1.0
2.0
3.0
V
—
䊊Not designed for radiation resistance.
2
29k
D2
•Electrical characteristics (unless otherwise noted Ta = 25°C and V
Operating voltage
R2
45k
34k
D2
Parameter
R1
100
CTLC
Q3
30k
Multimedia ICs
BA7645N
•Measurement circuit
MUTE
LOGIC
V
1
2
3
4
5
6
7
8
9
P-P
10
VCC
A
+
SW1
SW2
2
1
1
1µF
SW3
2
1
1µF
OSC
50Ω
SW5
SW6
2 31
2 3
1
VCC
VCC
1
1µF
1µF
SW7
1µF
1
2
OSC
OSC
50Ω
SW4
47µF
0.022µF
2
1µF
OSC
50Ω
50Ω
1µF
1µF
2 3
VCC
Fig. 1
•Electrical characteristic curves
20
10
4
VCC = 12V
7
VCC = 9V
6
5
4
VCC = 5V
3
0
CROSSTALK: CT (dB)
8
VOLTAGE GAIN: Cf (dB)
OUTPUT VOLTAGE: VOUT (VP-P)
9
2
0
–2
2
– 40
– 60
1
0
0
– 20
–4
1
2
3
4
5
6
7
8
9
10
100k
300k
1M
3M
10M
30M
100M
– 80
100k
300k
1M
3M
10M
30M
100M
INPUT VOLTAGE: VIN (VP-P)
FREQUENCY: f (Hz)
FREQUENCY: f (Hz)
Fig. 2 VIN vs. VOUT (f = 1kHz)
Fig. 3 Frequency characteristics
Fig. 4 Interchannel crosstalk
3
Multimedia ICs
BA7645N
•Measurement conditions
Parameter
Symbol
Switch settings
SW1
SW2
SW3
SW4
SW5
SW6
SW7
Measurement
method
Ammeter
ICC
2
2
2
2
2
2
2
Maximum
output level
IN 1
IN 2
IN 3
IN 4
Vom
Vom
Vom
Vom
1
2
2
2
2
1
2
2
2
2
1
2
2
2
2
1
3
3
2
2
3
2
3
2
3
3
3
3
f = 1kHz,
THD = 0.5%
Note 1
Voltage gain
IN 1
IN 2
IN 3
IN 4
GV
GV
GV
GV
1
2
2
2
2
1
2
2
2
2
1
2
2
2
2
1
3
3
2
2
3
2
3
2
3
3
3
3
f = 1MHz,
VIN = 1VP-P
Note 2
CT
CT
CT
CT
CT
CT
CT
CT
CT
CT
1
1
1
1
2
2
2
2
2
2
2
2
2
2
1
1
1
2
2
2
2
2
2
2
2
2
2
1
1
2
2
2
2
2
2
2
2
2
2
1
3
2
2
2
3
2
Interchannel
crosstalk
IN1→IN2
IN1→IN3
IN1→IN4
IN1→MUTE
IN2→IN3
IN2→IN4
IN2→MUTE
IN3→IN4
IN3→MUTE
IN4→MUTE
f = 4.43MHz,
VIN = 1VP-P
Note 3
Frequency
characteristic
IN 1
IN 2
IN 3
IN 4
Gf
Gf
Gf
Gf
1
2
2
2
2
1
2
2
2
2
1
2
f = 10MHz /
1MHz
VIN = 1VP-P
Note 4
CTL pin
switching level
CTLA
CTLB
CTLC
VTH
VTH
VTH
2
2
1
2
1
2
1
2
2
Current dissipation
∗
∗
∗
∗
∗
∗
∗
∗
3
3
3
2
3
3
2
3
2
2
2
2
2
1
3
3
2
2
3
2
3
2
3
3
3
3
2
2
2
1
3
3
3
1
3
3
3
1
2
2
2
3
2
2
Note 5
Note 6
∗ Anywhere is possible.
Note 1: Connect a distortion meter to the output, and input a f = 1kHz sine wave. Adjust the input level until the output distortion is 0.5%.
This output voltage at this time is the maximum output level Vom (VP-P).
Note 2: Input a f = 1MHz, VIN = 1VP-P sine wave. The voltage gain is given by GV = 20 log (VOUT / VIN).
Note 3: Input a f = 4.43MHz, VIN = 1VP-P sine wave. The interchannel crosstalk is given by CT = 20 log (VOUT / VIN).
Note 4: Input f = 1MHz and 10MHz, VIN = 1VP-P sine waves. The frequency characteristic is given by Gf = 20 log (VOUT (f = 10MHz) / VOUT (f = 1MHz)).
Note 5: Input a f = 1MHz, VIN = 1VP-P sine wave. Reduce the CTL pin voltage from VCC. The CTL pin switching level (VTH) is the CTL pin voltage at which
the VOUT level drops below 20mVP-P.
Note 6: Input a f = 1MHz, VIN = 1VP-P sine wave. Increase the CTL pin voltage from 0V. The CTL pin switching level (VTH) is the CTL pin voltage at which
the VOUT level goes below 1.0VDC
•External dimensions (Units: mm)
2.8 ± 0.2
1.2
5.8 ± 0.2
1
3.5 ± 0.5
10.5 ± 0.5
25.2 ± 0.2
10
0.6
2.54
0.8
1.3
SIP10
4
0.3 ± 0.1
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