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PDF BA7652AF Data sheet ( Hoja de datos )
| Número de pieza | BA7652AF | |
| Descripción | Video signal swither/ 1 x 3-channel with clamped-input | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Multimedia ICs
Video signal swither, 1 × 3-channel
with clamped-input
BA7652AF
The BA7652AF is a video-signal switching IC that contains a three-channel clamped-input multiplexer and a built-in
mute circuit. 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
Video cassette recorders and camcorders
•Features
1) Small clamp capacitors can be used (ceramic,
3000pF (Min.), 0.01µF (FZ) (recommended)).
2) Low supply voltage operation possible. Supply volt-
age 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.).
5) Wide dynamic range (3.1VP-P Typ. for VCC = 5V).
6) Mute function.
7) Excellent frequency characteristics
(10MHz, 0dB Typ.).
8) Low interchannel crosstalk ( – 70dB Typ.).
9) Voltage can be applied to the control pins even
when VCC is not applied.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Applied voltage
Power dissipation
VCC 9
V
Pd
500∗
mW
Operating temperature
Topr
– 25 ~ + 75
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
∗ When mounted on a 50mm × 50mm board, reduced by 5.0mW for each increase in Ta of 1°C over 25°C.
•Recommended operating conditions (Ta = 25°C)
Parameter
Symbol
Recommended operating voltage
VCC
Limits
4.0 ~ 7.0
Unit
V
1
1 page  
Multimedia ICs
•Application examples
C.Video IN
Logic
IN1
0.01µF
1
CTLa
2
C.Video IN
Logic
IN2
0.01µF
3
CTLb
4
When superimposition is used
BA7652AF
LOGIC
GND
8
OUT
7
C.Video OUT
VCC
VCC
6
+
47µF
0.1µF
IN3
5
0.01µF
C.Video IN
C.Video IN
Logic
IN1
1
0.01µF
CTLa
2
Logic
IN2
3
DC1.7V or more
CTLb
4
LOGIC
GND
8
OUT
7
C.Video or DC OUT
VCC
6 VCC
+
47µF
0.1µF
IN3
5
DC1.7V or more
Fig. 1
•Operation notes
(1) 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) The BA7652AF is a three-channel multiplexer, but
two-channel operation is also possible. In this case, if
the unused input is left open it will oscillate, but this will
not effect the other inputs and cause problems. If this is
a concern, ground the unused input via a capacitor, or
connect it directly to VCC.
(4) If control inputs are left open they will be unstage,
set to H or L.
(5) When using superimposition, the DV voltage direct-
ly applied to the inputs should be at least 1.7V.
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet BA7652AF.PDF ] | |
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