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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.
*Applicationsaudio signal switching VCR, TV and *Features/ 1-output switches. 1) 4-input
2) Built-in mute. 3) Wide operating supply voltage range (4.5V to 13.0V). 4) Low power consumption (48mW Typ.). 5) Excellent frequency characteristics (10MHz, 0dB Typ.). 6) Wide dynamic range (3.5VP-P Typ.). 7) High input impedance (20k Typ.). 8) Low interchannel crosstalk ( - 65dB Typ., f = 4.43MHz).
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 13.5 850 - 25 ~ + 75 - 55 ~ + 125 Unit V mW C C
Reduced by 8.5mW for each increase in Ta of 1C over 25C.
*Block diagram
MUTE
*Truth table
CTL - A L (OPEN) L (OPEN) H H
LOGIC
CTL - B L (OPEN) H L (OPEN) H
CTL - C L (OPEN) L (OPEN) L (OPEN) L (OPEN) H
OUT IN1 IN2 IN3 IN4 MUTE
Either "L (open)" or "H".
5 CTLC 6 IN3 7 VCC 8 IN4 9 GND 10 VOUT
1 IN1
2 CTLA
3 CTLB
4 IN2
1
Multimedia ICs
BA7644AN
*Equivalent circuits
CLAMP INPUT
IN
Input bias current 1A (Typ.)
Input bias voltage 3.68V (VCC = 5V, Typ.)
Reference value
D1
OUTPUT
Vcc
D2 Vcc Q1 D1 OUT 100 R1 Q2 20k 2mA D2
Q1
R2
Output impedance 20 [Typ.]
Output DC voltage 2.2V (VCC = 5V, Typ.)
100A
100A
CTLA / CTLB
Vcc R4 20k
CTLC
Vcc R4 30k
R1 CTLA / B 100
R2 Q3 50k R3 34k D2 CTLC
R1 100
R2 Q3 45k R3 29k
D2
2
Multimedia ICs
BA7644AN
*Electrical characteristics (unless otherwise noted, Ta = 25C and VCC = 5V)
Parameter Operating voltage Supply current Maximum output level Voltage gain Interchannel crosstalk IN - IN IN - MUTE Symbol VCC ICC Vom GV CTin CTM Cf THD ZIN VTH-A VTH-B VTH-C Min. 4.5 -- 3.0 - 0.5 -- -- - 3.0 -- 14 1.0 1.0 1.0 Typ. -- 9.5 3.5 0 - 65 - 55 0 0.007 20 2.0 2.0 2.0 Max. 13.0 14.5 -- 0.5 -- -- 1.0 -- 26 3.0 3.0 3.0 Unit V mA VP-P dB dB dB dB % k V V V Conditions -- -- f = 1kHz, THD = 0.5% f = 1MHz, VIN = 1.0VP-P f = 4.43MHz, VIN = 1.0VP-P f = 4.43MHz, VIN = 1.0VP-P f = 10MHz / 1MHz, VIN = 1.0VP-P f = 1kHz, VIN = 1.0VP-P -- -- -- --
Frequency characteristic Total-harmonic distortion Input impedance CTL pin switching level A CTL pin switching level B CTL pin switching level C
Not designed for radiation resistance.
*Measurement circuit
MUTE VCC P-P
+
LOGIC
1
2
3
4
5
6
7
8
9
10
SW1 1 23
SW2 1 23
SW3 1 23
SW4 1 23
1F V
1F V 1F 1F
1F V 1F OSC 50A 50
1F 1F V 50A
OSC 50
OSC 50 50A
OSC 50A
~
~
SW6 SW5 1 23 1 23
~
SW7 1 23
~
VCC
VCC
VCC
Fig. 1
50
0.022F
47F
V
A
3
Multimedia ICs
BA7644AN
*Measurement conditions
Parameter Current dissipation Maximum output level IN 1 IN 2 IN 3 IN 4 IN1 IN2 IN3 IN4 IN1IN2 IN1IN3 IN1IN4 IN1MUTE IN2IN3 IN2IN4 IN2MUTE IN3IN4 IN3MUTE IN4MUTE IN 1 IN 2 IN 3 IN 4 IN 1 IN 2 IN 3 IN 4 IN 1 IN 2 IN 3 IN 4 CTL - A CTL - B CTL - C Symbol ICC Vom Vom Vom Vom GV GV GV GV CT CT CT CT CT CT CT CT CT CT Gf Gf Gf Gf THD THD THD THD ZIN ZIN ZIN ZIN VTH VTH VTH Switch settings SW1 2 1 2 2 2 1 2 2 2 1 1 1 1 2 2 2 2 2 2 1 2 2 2 1 2 2 2 3 2 2 2 2 2 1 SW2 2 2 1 2 2 2 1 2 2 2 2 2 2 1 1 1 2 2 2 2 1 2 2 2 1 2 2 2 3 2 2 2 1 2 SW3 2 2 2 1 2 2 2 1 2 2 2 2 2 2 2 2 1 1 2 2 2 1 2 2 2 1 2 2 2 3 2 1 2 2 SW4 2 2 2 2 1 2 2 2 1 2 2 2 2 2 2 2 2 2 1 2 2 2 1 2 2 2 1 2 2 2 3 2 2 2 SW5 2 3 3 2 2 3 3 2 2 3 2 2 SW6 2 3 2 3 2 3 2 3 2 2 3 2 3 2 2 SW7 2 3 3 3 3 3 3 3 3 3 3 3 2 3 3 2 3 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 1 Measurement method Ammeter f = 1kHz, THD = 0.5% Note 1 f = 1MHz, VIN = 1VP-P Note 2
Voltage gain
Interchannel crosstalk

3 3 2 2 3 3 2 2 3 3 2 2 1 3 3 2 2 2

3 2 3 2 3 2 3 2 3 2 3 2 3 1 3
f = 4.43MHz, VIN = 1VP-P Note 3
Frequency characteristic
f = 10MHz / f = 1MHz VIN = 1VP-P Note 4 f = 1kHz VIN = 1VP-P Note 5
Total-harmonic distortion
Input impedance
Note 6
CTL pin switching level
Note 7 Note 8
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 DC50A is flowing into the input pin. Measure the input pin open-circuit voltage. The input impedance is given by Z = (VIN50 - VIN0) / 50 x 10-6 []. 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
10 9
20 4
OUTPUT VOLTAGE: VOUT (VP-P)
VOLTAGE GAIN: Cf (dB)
8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7
VCC = 12V VCC = 9V 2 CROSSTALK: CT (dB) 300k 1M 3M 10M 30M 100M
0
- 20
0
VCC = 5V
- 40
-2
- 60
8
9
10
-4 100k
- 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
*External dimensions (Units: mm)
25.2 0.2
2.8 0.2
10.5 0.5
5.8 0.2
1.2 1
3.5 0.5
2.54
10 0.6 0.8 1.3 0.3 0.1
SIP10
5

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