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參數(shù)資料
| 型號(hào)： | AD8555 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
| 中文描述： | 零漂移，數(shù)字可編程傳感器信號(hào)放大器 |
| 文件頁(yè)數(shù)： | 25/28頁(yè) |
| 文件大小： | 503K |
| 代理商： | AD8555 |
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AD8555
FILTERING FUNCTION
The AD8555’s FILT/DIGOUT pin can be used to create a simple
low-pass filter. The AD8555’s internal 18 k resistor can be
used with an external capacitor for this purpose. Typical
responses of the AD8555, configured for a gain of 70 and gain
of 1280, are shown in Figure 54 and Figure 55, respectively. This
filtering feature can be used to pass the signals within the filter’s
pass band while limiting the out-of-band signals bandwidth
and, therefore, reducing the noise of the overall solution.
Rev. 0 | Page 25 of 28
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AD8555
VDD
FILT/DIGOUT
DIGIN
VNEG
VSS
VOUT
VCLAMP
VPOS
V
OUT
C
FILTER
VDD
VDD
VSS
0
V
IN
Figure 53. AD8555 Configured to Filter Noise
0
10
100
1k
10k
50k
d
40
20
0
C
FILTER
= 0.001
μ
F
C
FILTER
= 0.010
μ
F
C
FILTER
= 0.100
μ
F
Figure 54. Typical Response of the AD8555 at FILT/DIGOUT Pin (Gain = 70)
0
100k
10
100
1k
10k
d
60
40
20
0
C
FILTER
= 0.001
μ
F
C
FILTER
= 0.010
μ
F
C
FILTER
= 0.100
μ
F
Figure 55. Typical Response of the AD8555 at FILT/DIGOUT Pin (Gain = 1280)
DRIVING CAPACITIVE LOADS
The AD8555 can drive large capacitive loads. This feature is
useful when the amplifier, placed close to the sensor, has to
drive long cables. Most instrumentation amplifiers have diffi-
culty driving capacitance due to the degradation of the phase
margin caused by the additional phase lag from the capacitive
load. Higher capacitance at the output can increase the amount
of overshoot and ringing in the amplifier’s step response and
could even affect the stability of the device. Additionally, the
value of the capacitive load that an amplifier can drive before
oscillation varies with gain, supply voltage, input signal, and
temperature. Figure 57 and Figure 58 show the overshoot
response of AD8555 versus the capacitive load with a different
value isolation resistor (R
S
) in Figure 56. Similar to all amplifi-
ers, the AD8555 responds with overshoot when driving large C
L
,
but after a point (approximately 22 nF), the overshoot decreases.
This is because the pole created by C
L
dominates at first; how-
ever, at some point, the pole is farther in than the pole setting of
the buffer amplifier and is ignored by AD8555.
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AD8555
VDD
FILT/DIGOUT
DIGIN
VNEG
VSS
VOUT
VCLAMP
VPOS
VDD
C
L
VDD
V
OUT
VSS
0
R
S
C
FILTER
Figure 56. Test Circuit for Driving Capacitive Loads
0
LOAD CAPACITANCE (nF)
100
0.1
1
10
O
60
50
40
30
20
10
0
R
S
C
L
= 1nF
OUTPUT
BUFFER
V
S
= ±2.5V
R
S
= 0
R
S
= 10
R
S
= 20
R
S
= 50
R
S
= 100
Figure 57. Positive Overshoot Graph vs. C
L
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8555ACP-R2 | Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
| AD8555ACP-REEL | Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
| AD8561AR | Ultrafast 7 ns Single Supply Comparator |
| AD8561ARU | Ultrafast 7 ns Single Supply Comparator |
| AD8561AN | Ultrafast 7 ns Single Supply Comparator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8555_09 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
| AD85551 | 制造商:AD 制造商全稱:Analog Devices 功能描述:10 MHz, 20 V/レs, G = 1, 10, 100, 1000 i CMOS㈢ Programmable Gain Instrumentation Amplifier |
| AD8555ACP | 制造商:Analog Devices 功能描述:SP AMP CURRENT SENSE AMP SGL R-R I/O 5.5V 16LFCSP EP - Bulk |
| AD8555ACP-R2 | 制造商:Analog Devices 功能描述:SP Amp Current Sense Amp Single R-R I/O 5.5V 16-Pin LFCSP EP T/R 制造商:Rochester Electronics LLC 功能描述:AUTO ZERO AMP W/PROGRAMMABLE GAIN/OFFSET - Bulk |
| AD8555ACP-REEL | 制造商:Analog Devices 功能描述:SP Amp Current Sense Amp Single R-R I/O 5.5V 16-Pin LFCSP EP T/R |
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