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AD622 数据表(PDF) 10 Page - Analog Devices |
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AD622 数据表(HTML) 10 Page - Analog Devices |
10 / 16 page 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 |
类似零件编号 - AD622_1 |
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类似说明 - AD622_1 |
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