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AD626AR-REEL bảng dữ liệu(PDF) 11 Page - Analog Devices |
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AD626AR-REEL bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 12 page AD626 –11– CURRENT SENSOR INTERFACE A typical current sensing application, making use of the large common-mode range of the AD626, is shown in Figure 9. The current being measured is sensed across resistor RS. The value of RS should be less than 1 k and should be selected so that the average differential voltage across this resistor is typically 100 mV. To produce a full-scale output of +4 V, a gain of 40 is used adjust- able by ±20% to absorb the tolerance in the sense resistor. Note that there is sufficient headroom to allow at least a 10% overrange (to +4.4 V). RG RH CF OPTIONAL LOW-PASS FILTER OUTPUT +VS CURRENT IN CURRENT OUT 0.1 F 1 2 3 4 8 7 6 5 –IN +IN G = 100 OUT AD626 200k 200k 100k ANALOG GND –VS FILTER 1/6 +VS 0.1 F –VS RS CURRENT SENSOR G = 2 G = 30 Figure 9. Current Sensor Interface BRIDGE APPLICATION Figure 10 shows the AD626 in a typical bridge application. Here, the AD626 is set to operate at a gain of 100, using dual-supply voltages and offering the option of low-pass filtering. CF OPTIONAL LOW-PASS FILTER OUTPUT +5V 0.1 F 1 2 3 4 8 7 6 5 –IN +IN G = 100 OUT AD626 200k 200k 100k ANALOG GND –VS FILTER 1/6 +VS 0.1 F –5V +VS G = 30 G = 2 Figure 10. A Typical Bridge Application REV. D |
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