2-input, 1-output video signal switcher

Multimedia ICs
2-input, 1-output video signal
switcher
BA7654F
The BA7654F is video signal switch consisting of two input pins (IN1 and IN2), one CTL pin (CTL), and one output
pin (OUT). The inputs are sync-tip clamped (synchronous edge of the video input signals are aligned to the same
voltage), and as the input impedance is extremely large, it is possible to use a small value for the clamp capacitor
(the recommended capacitor is 0.01µF (FZ) ceramic).
Applications
•VCRs,
TVs, and other equipment using video signals
•1)Features
Small clamp capacitors can be used (ceramic,
5) Wide dynamic range (when VCC = 5V, 3.1VP-P Typ.).
6) Excellent frequency characteristics (10MHz, 0dB
Typ.).
7) Low interchannel crosstalk (– 70dB Typ.).
8) Voltage can be applied to the control pins even
when VCC is not applied.
3000pF (Min.), 0.01µF (FZ) (recommended)).
2) Low supply voltage operation possible supply voltage range is 3.7V to 7.7V.
3) Superimposition used for fast switching speed with
low switching noise (70ns Typ.).
4) Low power consumption
(when VCC = 5V, 25mW Typ.).
•Selected output mode setting table
CTL
OUT
L
IN1
H
IN2
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
VCC
9
V
mW
Applied voltage
Pd
500∗
Operating temperature
Topr
– 25 ~ + 75
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
Power dissipation
∗ Reduced by 50mW for each increase in Ta of 1°C over 25 °C.
•Recommended operating conditions (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Operating power supply voltage
VCC
4.0 ~ 7.0
V
䊊Not designed for radiation resistance.
1
Multimedia ICs
BA7654F
•Block diagram
IN1
1
8
GND
CTL
2
7
OUT
IN2
3
6
VCC
5
Open.
Logic
GND
2
4
Multimedia ICs
BA7654F
•Input / output circuits (1 / 2)
Pin
No.
Pin name
Reference voltage
(VCC = 5V)
Input/output
impedance
Equivalent circuit
Vcc
1
IN 1
1.65V
10MΩ or more
IN1
100
50µA
Vcc
2.3V
2
CTL
—
—
50k
CTLa
1.9V
Vcc
3
IN 2
1.65V
10MΩ or more
IN1
100
50µA
GND
4
GND
—
—
3
Multimedia ICs
BA7654F
•Input / output circuits (2 / 2)
Pin
No.
Pin name
Reference voltage
(VCC = 5V)
Input/output
impedance
Equivalent circuit
Vcc
6
VCC
0.5V
—
Vcc
7
OUT
0.95V
26Ω
OUT
ImA
Vcc
8
GND
0V
—
GND
4
Multimedia ICs
BA7654F
•Electrical characteristics (unless otherwise noted, Ta = 25°C, V
CC
Parameter
Power supply voltage
Circuit current
Maximum output level
= 5V)
Symbol
Min.
Typ.
Max.
Unit
Conditions
VCC
3.7
—
7.7
V
—
ICC
2.7
5.0
8.2
mA
Vom
2.6
3.1
—
VP-P
f = 1kHz, THD = 1.0%
+ 0.5
dB
f = 1MHz, VIN = 1.0VP-P
—
dB
f = 4.43MHz, VIN = 1.0VP-P
f = 10MHz/1MHz, VIN = 1.0VP-P
Voltage gain
GV
– 0.5
Interchannel crosstalk
Cta
—
Gf
– 3.0
0
+ 1.0
dB
—
2.5
—
—
1.0
—
V
Frequency characteristics
VthL
VthH
CTL switching voltage
0
– 70
—
∗
∗ Vcc-CTL Threshold Level
Vth = Vcc-VF × 20 (V)
45
•Guaranteed design parameters (unless otherwise noted, Ta = 25°C, V
CC
Parameter
Symbol
Min.
Typ.
= 5V)
Unit
Max.
Conditions
Differential gain
DG
—
0
0.5
%
VIN = 1.0VP-P
standard staircase signal
Differential phase
DP
—
0.5
1.0
deg
VIN = 1.0VP-P
standard staircase signal
•Measurement circuit
SW7
1
1
2
V
8
Vector
Scorp
Clump
SW2
2
7
Clump
1
2
Vcc
1.0V
2.5V
3
A
6
C10
C11
Logic
0.1µ
4
5
SW1
1
C1
2
C2
3300p
SW3
3
C3
3300p
3300p
1
2
C4
C5
1.0V
3300p
SG
OSC
47µ
Open
3
C6
3300p
3300p
SG
OSC
Fig. 1
5
Multimedia ICs
BA7654F
•Measurement conditions
Parameter
Symbol
SW1
SW3
SW2
SW7
Conditions
Circuit current
Icc
3
3
2
—
—
Maximum
output level
IN 1
IN 2
Vom 1
Vom 2
1
3
3
1
1
2
1
1
f = 1kHZ THD = 1.0%∗1
Voltage gain
IN 1
IN 2
Gv 1
Gv 2
1
3
3
1
1
2
1
1
VIN = 1.0VP-P f = 1MHz∗2
Frequency
characteristics
IN 1
IN 2
Gf 1
Gf 2
1
3
3
1
1
2
1
1
VIN = 1.0VP-P f = 1MHz and 10MHz∗3
Interchannel
crosstalk
IN 1→IN 2
IN 2←IN 1
Cta1 – 2
Cta2 – 1
1
3
3
1
2
1
1
1
VIN = 1.0VP-P f = 4.43MHz∗4
Differential gain
IN 1
IN 2
DG 1
DG 2
2
3
3
2
1
2
2
2
VIN = 1.0VP-P standard staircase signal
Differential phase
IN 1
IN 2
DP 1
DP 2
2
3
3
2
1
2
2
2
VIN = 1.0VP-P standard staircase signal
∗ CTL switching level is substituted by performing the above measurements.
∗1 Connect a distortion meter to the output. After adding a f = 1kHz sine wave input from the OSC, adjust the input level so that the output
distortion is 1.0%. The output voltage at that time is the maximum output level Vom [VP-P].
∗2 Apply to the input pin a VIN = 1.0VP-P, f = 1MHz sine wave input.
Voltage gain GV = 20-log (VOUT / VIN)
∗3 Apply to the input pin VIN = 1.0VP-P, f = 1MHz and 10MHz sine wave inputs.
Frequency characteristics Gf = GV (f = 1MHz) – GV (f = 10MHz)
∗4 Apply to the input pin a VIN = 1.0VP-P, f = 4.43MHz sine wave input.
Interchannel crosstalk Cta = 20log (VOUT / VIN)
6
Multimedia ICs
BA7654F
•Application examples
Vcc
BA7654F
0.01µ
C.Video IN
1
Vcc
IN 1
6
47µ
0.01µ
C.Video IN
Logic
3
IN 2
5
Open
2
CTL
4
GND
OUT
7
GND
8
0.1µ
C.Video OUT
Fig. 2
Vcc
BA7654F
0.01µ
C.Video IN
1
IN 1
Vcc
6
47µ
3
IN 2
5
Open
2
CTL
4
GND
0.1µ
DC 1.7V(min)
Logic
OUT
7
GND
8
C.Video OUT/DC OUT
Fig. 3
7
Multimedia ICs
BA7654F
notes
•(1)Operation
To ensure stable clamp operation, the output
impedance of the previous stage connected to the
inputs should be 1kΩ or lower.
(2) If large input clamp capacitors are used, the time
constant of the circuit will mean that some time will be
required until stable operation after power is applied.
The value for the input clamp capacitors is 0.1µF max.
(0.01µF (FZ) ceramic capacitor recommended).
(3) If CTL pins are unstable when open. Set them to
either H or L.
(4) When using superimposition, the DC voltage directly applied to the inputs should be at least 1.7V.
•External dimensions (Units: mm)
14.0 ± 0.3
10.0 ± 0.2
23
22
44
12
2.15 ± 0.1
0.05
1
0.8
11
0.35 ± 0.1
QFP44
8
1.2
14.0 ± 0.3
10.0 ± 0.2
33
34
0.15 ± 0.1
0.15