ROHM BA7644

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
•1)Features
4-input / 1-output switches.
5) Excellent frequency characteristics
(10MHz, 0dB Typ.).
6) Wide dynamic range (3.5VP-P Typ.).
7) High input impedance (20kΩ Typ.).
8) Low interchannel crosstalk
( – 65dB Typ., f = 4.43MHz).
2) Built-in mute.
3) Wide operating supply voltage range
(4.5V to 13.0V).
4) Low power consumption (48mW Typ.).
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Power supply voltage
VCC
13.5
V
Power dissipation
Pd
850∗
mW
Operating temperature
Topr
– 25 ~ + 75
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
∗ Reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
•Block diagram
•Truth table
MUTE
LOGIC
CTL - C
OUT
CTL - A
CTL - B
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
1
2
3
4
5
6
7
8
9
10
IN1
CTLA
CTLB
IN2
CTLC
IN3
VCC
IN4
GND
VOUT
∗ Either "L (open)" or "H".
1
Multimedia ICs
BA7644AN
•Equivalent circuits
CLAMP INPUT
∗ Reference value
Input bias current 1µA (Typ.)∗
IN
Input bias voltage 3.68V (VCC = 5V, Typ.)∗
D1
OUTPUT
Vcc
D2
Q1
Vcc
Q1
D1
OUT
R2
100
Output impedance 20Ω [Typ.]∗
R1
Q2
20k
D2
100µA
100µA
CTLC
CTLA / CTLB
Vcc
Vcc
R4
R1
R2
100
50k
CTLA / B
20k
Q3
R3
D2
2
Output DC voltage 2.2V (VCC = 5V, Typ.)∗
2mA
R4
R1
R2
100
45k
CTLC
30k
Q3
34k
R3
D2
29k
Multimedia ICs
BA7644AN
•Electrical characteristics (unless otherwise noted, Ta = 25°C and V
Parameter
Symbol
Min.
Operating voltage
VCC
Supply current
ICC
Maximum output level
= 5V)
Unit
Conditions
13.0
V
—
14.5
mA
—
3.5
—
VP-P
f = 1kHz, THD = 0.5%
Typ.
Max.
4.5
—
—
9.5
Vom
3.0
GV
– 0.5
0
0.5
dB
f = 1MHz, VIN = 1.0VP-P
IN - IN
CTin
—
– 65
—
dB
f = 4.43MHz, VIN = 1.0VP-P
IN - MUTE
CTM
—
– 55
—
dB
f = 4.43MHz, VIN = 1.0VP-P
– 3.0
0
1.0
dB
f = 10MHz / 1MHz,
VIN = 1.0VP-P
f = 1kHz, VIN = 1.0VP-P
Voltage gain
Interchannel
crosstalk
CC
Frequency characteristic
Cf
Total-harmonic distortion
THD
—
0.007
—
%
ZIN
14
20
26
kΩ
—
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
—
Input impedance
䊊Not designed for radiation resistance.
•Measurement circuit
MUTE
VCC
LOGIC
P-P
4
1µF
8
9
10
SW4
1 2 3
1µF
1µF
V
SW6
SW5
1 2 3 1 2 3
VCC
VCC
1µF
OSC
50µA
~
50Ω
OSC
50µA
~
50Ω
OSC
1µF
V
50µA
1µF
50Ω
7
SW3
1 2 3
V
OSC
6
SW2
1 2 3
1µF
~
5
+
~
V
50µA
3
1µF
SW1
1 2 3
2
50Ω
1
47µF
V
0.022µF
A
SW7
1 2 3
VCC
Fig. 1
3
Multimedia ICs
BA7644AN
•Measurement conditions
Parameter
Symbol
Switch settings
SW1
SW2
SW3
SW4
SW5
SW6
SW7
Measurement method
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
IN1
IN2
IN3
IN4
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
Total-harmonic
distortion
IN 1
IN 2
IN 3
IN 4
THD
THD
THD
THD
1
2
2
2
2
1
2
2
Input
impedance
IN 1
IN 2
IN 3
IN 4
ZIN
ZIN
ZIN
ZIN
3
2
2
2
CTL pin
switching level
CTL - A
CTL - B
CTL - C
VTH
VTH
VTH
2
2
1
Current dissipation
Ammeter
∗
∗
∗
∗
∗
∗
∗
∗
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
f = 10MHz / f = 1MHz
VIN = 1VP-P
Note 4
2
2
1
2
2
2
2
1
3
3
2
2
3
2
3
2
3
3
3
3
f = 1kHz
VIN = 1VP-P
Note 5
2
3
2
2
2
2
3
2
2
2
2
3
3
3
2
2
3
2
3
2
3
3
3
3
Note 6
2
1
2
1
2
2
2
2
2
1
3
3
3
1
3
3
3
1
Note 7
Note 8
2
2
2
3
2
2
∗ 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 1VP-P, 1MHz sine wave. The voltage gain is given by GV = 20 log (VOUT / VIN).
Note 3: Input a 1VP-P, 4.43MHz sine wave. The interchannel crosstalk is given by CT = 20 log (VOUT / VIN).
Note 4: Input 1VP-P, 1MHz and 10MHz sine waves. The frequency characteristic is given by Gf = 20 log (VOUT (f = 10MHz) / VOUT (f = 1MHz)).
Note 5: Input a 1VP-P, 1MHz sine wave and measure the total-harmonic distortion of the output using a total-harmonic distortion meter.
Note 6: Measure the input pin voltage VIN50 when a current of DC50µA is flowing into the input pin. Measure the input pin open-circuit voltage.
The input impedance is given by Z = (VIN50 - VIN0) / 50 × 10-6 [Ω].
Note 7: Input a 1VP-P, 1MHz 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 8: Input a 1VP-P, 1MHz 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 above 1.0VP-P.
4
Multimedia ICs
BA7644AN
•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
– 20
– 40
– 60
1
0
0
1
2
3
4
5
6
7
8
9
10
–4
100k
300k
1M
3M
10M
30M
100M
FREQUENCY: f (Hz)
INPUT VOLTAGE: VIN (VP-P)
Fig. 2 VIN vs. VOUT (f = 1kHz)
Fig. 3 Frequency characteristics
– 80
100k
300k
1M
3M
10M
30M
100M
FREQUENCY: f (Hz)
Fig. 4 Interchannel crosstalk
•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
0.3 ± 0.1
1.3
SIP10
5