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AD622 데이터시트(PDF) 8 Page - Analog Devices

부품명 AD622
상세설명  Low Cost Instrumentation Amplifier
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
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AD622 데이터시트(HTML) 8 Page - Analog Devices

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AD622
REV. C
–8–
Table I. Make vs. Buy Error Budget
Total Error
Total Error
in ppm
in ppm
AD622 Circuit
“Homebrew” Circuit
Relative to 1 V FS
Relative to 1 V FS
Error Source
Calculation
Calculation
AD622
Homebrew
ABSOLUTE ACCURACY at TA = +25°C
Total RTI Offset Voltage,
µV
250
µV + 1500 µV/10
800
µV × 2
400
1600
Input Offset Current, nA
2.5 nA
× 1kΩ
15 nA
× 1 kΩ
2.5
15
CMR, dB
86 dB
→50 ppm × 0.5 V
(0.1% Match
× 0.5 V)/10 V
25
50
Total Absolute Error
427.5
1665
DRIFT TO +85
°C
Gain Drift, ppm/
°C
(50 ppm + 5 ppm)
× 60°C
(50 ppm)/
°C × 60°C
3300
3000
Total RTI Offset Voltage,
µV/°C(2 µV/°C + 15 µV/°C/10) × 60°C9 µV/°C × 2 × 60°C
210
1080
Input Offset Current, pA/
°C
2 pA/
°C × 1kΩ × 60°C
155 pA/
°C × 1kΩ × 60°C
0.12
9.3
Total Drift Error
3510.12
4089.3
RESOLUTION
Gain Nonlinearity, ppm of Full Scale
10 ppm
20 ppm
10
20
Typ 0.1 Hz–10 Hz Voltage Noise,
µV p-p 0.6 µV p-p
0.55
µV p-p × √2
0.6
0.778
Total Resolution Error
10.6
20.778
Grand Total Error
3948
5575
GAIN SELECTION
The AD622’s gain is resistor programmed by RG, or more pre-
cisely, by whatever impedance appears between Pins 1 and 8.
The AD622 is designed to offer gains as close as possible to
popular integer values using standard 1% resistors. Table II
shows required values of RG for various gains. Note that for
G = 1, the RG pins are unconnected (RG = ∞). For any arbitrary
gain R G can be calculated by using the formula
RG =
50.5
k
G
−1
To minimize gain error avoid high parasitic resistance in series
with RG, and to minimize gain drift, RG should have a low
TC—less than 10 ppm/
°C for the best performance.
Table II. Required Values of Gain Resistors
Desired
1% Std Table
Calculated
Gain
Value of RG,
Gain
2
51.1 k
1.988
5
12.7 k
4.976
10
5.62 k
9.986
20
2.67 k
19.91
33
1.58 k
32.96
40
1.3 k
39.85
50
1.02 k
50.50
65
787
65.17
100
511
99.83
200
255
199.0
500
102
496.1
1000
51.1
989.3


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