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10 / 12 page REV. A AD629 –10– Table III. AD629 vs. INA117 Error Budget Analysis Example 1 (VCM = 200 V dc) 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 DC CMR (Over Temperature) (224 × 10-6 × 200 V) ÷ 10 V × 106 (500 × 10-6 × 200 V) ÷ 10 V × 106 4,480 10,000 Total Accuracy Error: 5,080 10,700 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 Total Resolution Error: 26 63 Total Error: 5,826 11,603 Output Current and Buffering The AD629 is designed to drive loads of 2 k Ω to within 2 V of the rails, but can deliver higher output currents at lower output voltages (see Figure 15). If higher output current is required, the AD629’s output should be buffered with a precision op amp such as the OP113 as shown in Figure 35. This op amp can swing to within 1 V of either rail while driving a load as small as 600 Ω. VOUT REF(–) –IN +IN –VS NC +VS REF(+) AD629 380k 380k 380k 20k NC = NO CONNECT 0.1 F 8 7 6 5 1 2 3 4 0.1 F 0.1 F 0.1 F –VS OP113 21.1k Figure 35. Output Buffering Application A Gain of 19 Differential Amplifier While low level signals can be connected directly to the –IN and +IN inputs of the AD629, differential input signals can also be connected as shown in Figure 36 to give a precise gain of 19. However, large common-mode voltages are no longer permissible. Cold junction compensation can be implemented using a tempera- ture sensor such as the AD590. VOUT REF(–) –IN +IN VREF NC +VS REF(+) AD629 380k 380k 380k 20k NC = NO CONNECT 0.1 F 8 7 6 5 1 2 3 4 THERMOCOUPLE 21.1k Figure 36. A Gain of 19 Thermocouple Amplifier Error Budget Analysis Example 1 In the dc application below, the 10 A output current from a device with a high common-mode voltage (such as a power sup- ply or current-mode amplifier) is sensed across a 1 Ω shunt resistor (Figure 37). The common-mode voltage is 200 V, and the resistor terminals are connected through a long pair of lead wires located in a high-noise environment, for example, 50 Hz/ 60 Hz 440 V ac power lines. The calculations in Table III assume an induced noise level of 1 V at 60 Hz on the leads, in addition to a full-scale dc differential voltage of 10 V. The error budget table quantifies the contribution of each error source. Note that the dominant error source in this example is due to the dc common-mode voltage. |
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