參數(shù)資料
型號(hào)： AD8555ARZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 18/28頁(yè)
文件大?。?/td> 0K
描述： IC AMP CHOPPER 2MHZ 10MA 8SOIC
標(biāo)準(zhǔn)包裝： 98
系列： DigiTrim®
放大器類型： 斷路器（零漂移）
電路數(shù)： 1
轉(zhuǎn)換速率： 1.2 V/µs
增益帶寬積： 2MHz
電流 - 輸入偏壓： 16nA
電壓 - 輸入偏移： 2µV
電流 - 電源： 2mA
電流 - 輸出 / 通道： 10mA
電壓 - 電源，單路/雙路(±)： 2.7 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 管件
產(chǎn)品目錄頁(yè)面： 771 (CN2011-ZH PDF)
AD8555
Rev. A | Page 25 of 28
FILTERING FUNCTION
The AD8555’s FILT/DIGOUT pin can be used to create a sim-
ple low-pass filter. The AD8555’s internal 18 kΩ 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.
1
2
3
4
5
6
7
8
AD8555
VDD
FILT/DIGOUT
DIGIN
VNEG
VSS
VOUT
VCLAMP
VPOS
VOUT
VDD
CFILTER
VDD
VSS
04598-0-051
VIN
Figure 53. AD8555 Configured to Filter Noise
04598-0-052
10
100
1k
10k
50k
dB
40
20
0
CFILTER = 0.001μF
CFILTER = 0.010μF
CFILTER = 0.100μF
Figure 54. Typical Response of the AD8555 at FILT/DIGOUT Pin (Gain = 70)
04598-0-053
100k
10
100
1k
10k
dB
60
40
20
0
CFILTER = 0.001μF
CFILTER = 0.010μF
CFILTER = 0.100μF
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 (RS) in Figure 56. Similar to all amplifi-
ers, the AD8555 responds with overshoot when driving large
CL, but after a point (approximately 22 nF), the overshoot de-
creases. This is because the pole created by CL dominates at
first; however, at some point, the pole is farther in than the pole
setting of the buffer amplifier and is ignored by AD8555.
1
2
3
4
5
6
7
8
AD8555
VDD
FILT/DIGOUT
DIGIN
VNEG
VSS
VOUT
VCLAMP
VPOS
VDD
CL
VDD
VOUT
VSS
04598-0-054
RS
CFILTER
Figure 56. Test Circuit for Driving Capacitive Loads
04598-0-028
LOAD CAPACITANCE (nF)
100
0.1
1
10
OVER
SH
OOT
(
%
)
60
50
40
30
20
10
0
RS
CL = 1nF
OUTPUT
BUFFER
VS = ±2.5V
RS = 0
RS = 10
RS = 20
RS = 50
RS = 100
Figure 57. Positive Overshoot Graph vs. CL
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