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參數資料
| 型號： | AD8555AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數： | 25/28頁 |
| 文件大小： | 503K |
| 代理商： | AD8555AR |
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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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2
3
4
5
6
7
8
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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2
3
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5
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8
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
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8555AR-EVAL | 制造商:Analog Devices 功能描述:Evaluation Board For Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
| AD8555AR-REEL | 制造商:Analog Devices 功能描述:SP Amp Current Sense Amp Single R-R I/O 5.5V 8-Pin SOIC N T/R |
| AD8555AR-REEL7 | 制造商:Analog Devices 功能描述:SP Amp Current Sense Amp Single R-R I/O 5.5V 8-Pin SOIC N T/R |
| AD8555ARZ | 功能描述:IC AMP CHOPPER 2MHZ 10MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 標準包裝:2,500 系列:- 放大器類型:通用 電路數:4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8555ARZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
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