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AD622AN датащи(PDF) 10 Page - Analog Devices

номер детали AD622AN
подробное описание детали  Low Cost Instrumentation Amplifier
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD622AN датащи(HTML) 10 Page - Analog Devices

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AD622
Rev. D | Page 10 of 16
The AD622 provides greater accuracy at lower cost. The higher
cost of the homebrew circuit is dominated in this case by the
matched resistor network. One could also realize a homebrew
design using cheaper discrete resistors that are either trimmed
or hand selected to give high common-mode rejection. This
level of common-mode rejection, however, degrades significantly
over temperature due to the drift mismatch of the discrete
resistors.
Note that for the homebrew circuit, the LT1013 specification for
noise has been multiplied by √2. This is because a two op amp
type instrumentation amplifier has two op amps at its inputs,
both contributing to the overall noise.
Table 4. Make vs. Buy Error Budget
Total Error in ppm
Relative to 1 V FS
Error Source
AD622 Circuit Calculation
Homebrew Circuit 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 × 1 kΩ
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°C
9 μV/°C × 2 × 60°C
210
1080
Input Offset Current, pA/°C
2 pA/°C × 1 kΩ × 60°C
155 pA/°C × 1 kΩ × 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 to 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
5775


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