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參數資料
| 型號： | AD8555 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
| 中文描述： | 零漂移，數字可編程傳感器信號放大器 |
| 文件頁數： | 26/28頁 |
| 文件大?。?/td> | 503K |
| 代理商： | AD8555 |
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AD8555
Rev. 0 | Page 26 of 28
0
LOAD CAPACITANCE (nF)
100.0
0.1
1.0
10.0
O
60
50
40
30
20
10
0
R
S
C
L
V
S
= ±2.5V
R
S
= 0
R
S
= 10
R
S
= 20
R
S
= 50
R
S
= 100
Figure 58. Negative Overshoot Graph vs. C
L
RF INTERFERENCE
All instrumentation amplifiers show dc offset as the result of
rectification of high frequency out-of-band signals that appear
at their inputs. The circuit in Figure 59 provides good RFI sup-
pression without reducing performance within the AD8555 pass
band. Resistor R1 and Capacitor C1, and likewise Resistor R2
and Capacitor C2, form a low-pass RC filter that has a 3 dB
bandwidth equal to f
(3 dB)
= 1/2 π × R1 × C1. It can be seen that
R1, R2 and C1, C2 form a bridge circuit whose output appears
across the amplifier’s input pins. Any mismatch between C1, C2
unbalances the bridge and reduce the common-mode rejection.
Using the component values shown, this filter has a bandwidth
of approximately 40 kHz. To preserve common-mode rejection
in the AD8555’s pass band, capacitors need to be 5% (silver
mica) or better and should be placed as close to its inputs as
possible. Resistors should be 1% metal film. Capacitor C3 is
needed to maintain common-mode rejection at low frequencies.
This introduces a second low-pass network, R1 + R2 and C3
that has a 3 dB frequency equal to 1/(2 π × (R1 + R2)(C3)).
This circuit’s 3 dB signal bandwidth is approximately 4 kHz
when a C3 value of 0.047 μF is used (see Figure 59).
1
2
3
4
5
6
7
8
AD8555
VDD
FILT/DIGOUT
DIGIN
VNEG
VSS
VOUT
VCLAMP
VPOS
VPOS
VDD
VDD
VSS
0
VNEG
R2
4.02k
R1
4.02k
C3
0.047
μ
F
C2
1nF
C1
1nF
Figure 59. RFI Suppression Method
SINGLE-SUPPLY DATA ACQUISITION SYSTEM
Interfacing bipolar signals to single-supply analog-to-digital
converters (ADCs) presents a challenge. The bipolar signal must
be mapped into the input range of the ADC. Figure 60 shows
how this translation can be achieved. The output offset can be
programmed to a desirable level to accommodate the input
voltage requirement of the ADC.
1
2
3
4
5
6
7
8
AD8555
VDD
FILT/DIGOUT
DIGIN
VNEG
2
4
AD7476
12 BIT
AIN
V
DD
VSS
VOUT
VCLAMP
VPOS
VDD
0
VDD
S
DIGIN
10nF
0
100
100
100
100
Figure 60. A Single-Supply Data Acquisition Circuit Using the AD8555
相關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 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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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