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AD622AR-REEL7 Datasheet(PDF) 8 Page - Analog Devices |
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AD622AR-REEL7 Datasheet(HTML) 8 Page - Analog Devices |
8 / 11 page 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 Ω 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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