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AD629AR-REEL7 Datasheet(PDF) 11 Page - Analog Devices |
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AD629AR-REEL7 Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page REV. A AD629 –11– Table IV. AD629 vs. INA117 AC Error Budget Example 2 (VCM = 100 V @ 500 Hz) Error, ppm of FS Error Source AD629 INA117 AD629 INA117 ACCURACY, TA = 25 °C Initial Gain Error (0.0005 × 10) ÷ 10 V × 106 (0.0005 × 10) ÷ 10 V × 106 500 500 Offset Voltage (0.001 V ÷ 10 V) × 106 (0.002 V ÷ 10 V) × 106 100 200 Total Accuracy Error: 600 700 TEMPERATURE DRIFT (85 °C) Gain 10 ppm/ °C × 60°C 10 ppm/ °C × 60°C 600 600 Offset Voltage (20 µV/°C × 60°C) × 106/10 V (40 µV/°C × 60°C) × 106/10 V 120 240 Total Drift Error: 720 840 RESOLUTION Noise, Typ, 0.01–10 Hz, µV p-p 15 µV ÷ 10 V × 106 25 µV ÷ 10 V × 106 23 CMR @ 60 Hz (141 × 10–6 × 1 V) ÷ 10 V × 106 (500 × 10–6 × 1 V) ÷ 10 V × 106 14 50 Nonlinearity (10 –5 × 10 V) ÷ 10 V × 106 (10 –5 × 10 V) ÷ 10 V × 106 10 10 AC CMR @ 500 Hz (141 × 10–6 × 200 V) ÷ 10 V × 106 (500 × 10–6 × 200 V) ÷ 10 V × 106 2,820 10,000 Total Resolution Error: 2,846 10,063 Total Error: 4,166 11,603 VOUT REF(–) –IN +IN –VS NC +VS REF(+) AD629 21.1k 380k 380k 380k 20k NC = NO CONNECT 8 7 6 5 1 2 3 4 1 SHUNT 10 AMPS 200VCM DC TO GROUND OUTPUT CURRENT 60Hz POWER LINE 0.1 F 0.1 F Figure 37. Error Budget Analysis Example 1. VIN = 10 V Full-Scale, VCM = 200 V DC. RSHUNT = 1 Ω, 1 V p-p 60 Hz Power-Line Interference Error Budget Analysis Example 2 This application is similar to the previous example except that the sensed load current is from an amplifier with an ac common- mode component of ±100 V (frequency = 500 Hz) present on the shunt (Figure 38). All other conditions are the same as before. Note that the same kind of power line interference can happen as detailed in Example 1. However, the ac common- mode component of 200 V p-p coming from the shunt is much larger than the interference of 1 V p-p, so that this interference component can be neglected. VOUT REF(–) –IN +IN –VS NC +VS REF(+) AD629 21.1k 380k 380k 380k 20k NC = NO CONNECT 8 7 6 5 1 2 3 4 1 SHUNT 10 AMPS 100V AC CM TO GROUND OUTPUT CURRENT 60Hz POWER LINE 0.1 F 0.1 F Figure 38. Error Budget Analysis Example 2. VIN = 10 V Full-Scale, VCM = ±100 V at 500 Hz, RSHUNT = 1 Ω |
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