công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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AD622 bảng dữ liệu(PDF) 11 Page - Analog Devices |
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AD622 bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 17 page AD622 Data Sheet Rev. E | 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 5. Make vs. Buy Error Budget Error Source AD622 Circuit Calculation Homebrew Circuit Calculation Total Error in ppm Relative to 1 V FS AD622 Homebrew ABSOLUTE ACCURACY at TA = 25°C Total RTI Offset Voltage, µV 125 µV + 1500 µV/10 800 µV × 2 275 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 302.5 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 (1 µV/°C + 15 µV/°C /10) × 60°C 9 µV/°C × 2 × 60°C 150 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 3450.12 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 3763 5775 |
Số phần tương tự - AD622_16 |
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Mô tả tương tự - AD622_16 |
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