參數(shù)資料
型號(hào): AD810
廠商: Analog Devices, Inc.
英文描述: Low Power Video Op Amp with Disable(帶禁用的低功耗視頻運(yùn)放)
中文描述: 低功耗視頻運(yùn)算放大器具有禁用(帶禁用的低功耗視頻運(yùn)放)
文件頁(yè)數(shù): 14/16頁(yè)
文件大小: 521K
代理商: AD810
AD810
REV. A
–14–
2:1 VIDE O MULT IPLE X E R
T he 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. T he time to switch between
channels is about 0.75
μ
s 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. T he
switching time is only slightly affected by the signal level.
10
90
100
0%
5V
500mV
500nS
Figure 52. Channel Switching Time for the 2:1 Mux
–40
–90
1
10
100
–70
–80
–60
–50
F
FREQUENCY – MHz
Figure 53. 2:1 Mux OFF Channel Feedthrough vs.
Frequency
AD810
7
3
2
0.1μF
+5V
6
V
IN
A
750
–5V
4
0.1μF
8
V
SW
V
OUT
75
75
CABLE
74HC04
AD810
7
3
2
0.1μF
+5V
6
V
IN
B
–5V
4
0.1μF
8
75
750
750
750
75
75
Figure 54. A Fast Switching 2:1 Video Mux
–0.5
–3.0
1
10
100
–1.0
–1.5
–2.0
–2.5
0
0.5
0
–45
–90
–135
–180
–225
–270
PHASE
GAIN
C
P
FREQUENCY – MHz
V
S
= ±5V
Figure 55. 2:1 Mux ON Channel Gain and Phase vs.
Frequency
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