參數(shù)資料
型號(hào): AD8092ARM
廠商: ANALOG DEVICES INC
元件分類: 運(yùn)動(dòng)控制電子
英文描述: Low-Cost, High-Speed Rail-to-Rail Amplifiers
中文描述: DUAL OP-AMP, 27000 uV OFFSET-MAX, PDSO8
封裝: MO-187AA, MSOP-8
文件頁數(shù): 12/16頁
文件大小: 229K
代理商: AD8092ARM
AD8091/AD8092
–12–
REV. A
As the closed-loop gain is increased, the larger phase margin allows
for large capacitor loads with less peaking. Adding a low value resis-
tor in series with the load at lower gains has the same effect. Figure 4
shows the effect of a series resistor for various voltage gains. For
large capacitive loads, the frequency response of the amplifier
will be dominated by the series resistor and capacitive load.
R
G
R
F
C
L
R
S
V
OUT
V
IN
100mV STEP
50
R
S
= 3
R
S
= 0
10000
1000
11
6
2
C
P
F
3
4
5
100
10
A
CL
V/V
V
= 5V
30%
OVERSHOOT
Figure 4. Capacitive Load Drive vs. Closed-Loop Gain
Overdrive Recovery
Overdrive of an amplifier occurs when the output and/or input
range are exceeded. The amplifier must recover from this over-
drive condition. As shown in Figure 5, the AD8091/AD8092
recovers within 60 ns from negative overdrive and within 45 ns
from positive overdrive.
Figure 5. Overdrive Recovery
Active Filters
Active filters at higher frequencies require wider bandwidth op amps
to work effectively. Excessive phase shift produced by lower
frequency op amps can significantly impact active filter perfor-
mance.
Figure 6 shows an example of a 2 MHz biquad bandwidth filter
that uses three op amps. Such circuits are sometimes used in
medical ultrasound systems to lower the noise bandwidth of the
analog signal before A/D conversion. Please note that the
unused amplifiers
inputs should be tied to ground.
2
1
R1
3k
V
IN
R2
2k
C1
50pF
R3
2k
6
5
7
R6
1k
R5
2k
2
3
6
AD8092
AD8091
C2
50pF
V
OUT
R4
2k
3
AD8092
Figure 6. 2 MHz Biquad Band-Pass Filter
The frequency response of the circuit is shown in Figure 7.
FREQUENCY
Hz
10k
100M
100k
1M
10M
0
10
20
30
40
G
Figure 7. Frequency Response of 2 MHz Band-Pass
Biquad Filter
Sync Stripper
Synchronizing pulses are sometimes carried on video signals so as
not to require a separate channel to carry the synchronizing infor-
mation. However, for some functions, such as A/D conversion, it
is not desirable to have the sync pulses on the video signal. These
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