AD810 查看數據表（PDF） - Analog Devices
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AD810 Datasheet PDF : 16 Pages
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AD810
2:1 VIDEO MULTIPLEXER
The outputs of two AD810s can be wired together to form a
2:1 mux without degrading the flatness of the gain response.
Figure 54 shows a recommended configuration which results in
–0.1 dB bandwidth of 20 MHz and OFF channel isolation of
77 dB at 10 MHz on ± 5 V supplies. The time to switch between
channels is about 0.75 µs when the disable pins are driven by
open drain output logic. Adding pull-up resistors to the logic
outputs or using complementary output logic (such as the
74HC04) reduces the switching time to about 180 ns. The
switching time is only slightly affected by the signal level.
500mV
100
90
500nS
750Ω
VINA
75Ω
750Ω
VINB
75Ω
750Ω
+5V
0.1µF
2
7
AD810
6
4 0.1µF
3
8
–5V
750Ω
+5V
0.1µF
2
7
AD810
6
3
4 0.1µF
8
–5V
75Ω
75Ω CABLE
VOUT
75Ω
10
0%
5V
Figure 52. Channel Switching Time for the 2:1 Mux
–40
–50
–60
–70
–80
–90
1
10
100
FREQUENCY – MHz
Figure 53. 2:1 Mux OFF Channel Feedthrough vs.
Frequency
VSW
74HC04
Figure 54. A Fast Switching 2:1 Video Mux
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
1
VS = ±5V
GAIN
PHASE
0
–45
–90
–135
–180
–225
–270
10
100
FREQUENCY – MHz
Figure 55. 2:1 Mux ON Channel Gain and Phase vs.
Frequency
–14–
REV. A
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