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參數(shù)資料
| 型號： | AD8092ARZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 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： | LEAD FREE, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 283K |
| 代理商： | AD8092ARZ-REEL7 |
A8091/AD8092
DRIVING CAPACITIVE LOADS
A highly capacitive load reacts with the output of the amplifiers,
causing a loss in phase margin and subsequent peaking or even
oscillation, as shown in Figure 29 and Figure 30. There are two
methods to effectively minimize its effect.
Rev. B | Page 14 of 20
Put a small value resistor in series with the output to isolate
the load capacitor from the amplifier’s output stage.
Increase the phase margin with higher noise gains or by
adding a pole with a parallel resistor and capacitor from
IN to the output.
8
–12
–10
–8
–6
–4
–2
0
2
4
6
0.1
500
100
1
10
0
FREQUENCY (MHz)
G
V
= 5V
G = +1
R
L
= 2k
C
L
= 50pF
V
O
= 200mV p-p
Figure 29. Closed-Loop Frequency Response: C
L
= 50 pF
2.50V
100ns
50mV
2.60V
2.45V
2.55V
2.40V
0
V
= 5V
G = +1
R
L
= 2k
C
L
= 50pF
Figure 30. 200 mV Step Response: C
L
= 50 pF
As the closed-loop gain is increased, the larger phase margin
allows for large capacitor loads with less peaking. Adding a low
value resistor in series with the load at lower gains has the same
effect. Figure 31 shows the effect of a series resistor for various
voltage gains. For large capacitive loads, the frequency response
of the amplifier is dominated by the series resistor and
capacitive load.
10000
1
10
100
1000
1
6
5
2
3
4
0
A
CL
(V/V)
C
V
= 5V
≤
30%
OVERSHOOT
R
S
= 3
R
S
= 0
R
G
R
F
R
S
C
L
V
OUT
50
V
100mV STEP
Figure 31. Capacitive Load Drive vs. Closed-Loop Gain
OVERDRIVE RECOVERY
Overdrive of an amplifier occurs when the output and/or input
range is exceeded. The amplifier must recover from this
overdrive condition. The AD8091/AD8092 recover within 60 ns
from negative overdrive and within 45 ns from positive
overdrive, as shown in Figure 32.
0
V/DIV AS SHOWN
100ns
INPUT 1V/DIV
OUTPUT 2V/DIV
V
=
±
5V
G = +5
R
F
= 2k
R
L
= 2k
Figure 32. 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
performance.
Figure 33 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. Note that the unused
amplifiers’ inputs should be tied to ground.
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| AD8091AR-REEL7 | Low-Cost, High-Speed Rail-to-Rail Amplifiers |
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相關(guān)代理商/技術(shù)參數(shù) |
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| AD8099ACP-REEL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD8099ACP-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk 制造商:Rochester Electronics LLC 功能描述:ULTRA LOW NOISE & DIST. HIGH SPEED OPAMP - Tape and Reel |
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| AD8099ACPZ-R2 | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk 制造商:Analog Devices 功能描述:OP AMP SGL VOLT FDBK 6V/12V 8LFCSP EP - Tape and Reel 制造商:Analog Devices 功能描述:ULTRA LOW NOISE & DIST. HIGH SPEED OPAMP 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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