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AD626AR Scheda tecnica(PDF) 11 Page - Analog Devices |
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AD626AR Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 12 page AD626 REV. C –11– SINGLE-POLE LOW-PASS FILTERING A low-pass filter can be easily implemented by using the features provided by the AD626. By simply connecting a capacitor between Pin 4 and ground, a single-pole low-pass filter is created, as shown in Figure 32. CF CORNER FREQUENCY OF FILTER = 1 2 CF (100k ) OUTPUT +10V +INPUT –INPUT 0.1 F 1 2 3 4 8 7 6 5 –IN +IN G = 100 OUT AD626 200k 200k 100k G= 2 ANALOG GND –VS FILTER 1/6 G=30 +VS Figure 32. A One-Pole Low-Pass Filter Circuit Which Operates from a Single +10 V Supply CURRENT SENSOR INTERFACE A typical current sensing application, making use of the large common-mode range of the AD626, is shown in Figure 33. The current being measured is sensed across resistor RS. The value of RS should be less than 1 k Ω 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 adjustable 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 G= 2 ANALOG GND –VS FILTER 1/6 G=30 +VS 0.1 F –VS RS CURRENT SENSOR Figure 33. Current Sensor Interface BRIDGE APPLICATION Figure 34 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 G= 2 ANALOG GND –VS FILTER 1/6 G=30 +VS 0.1 F –5V +VS Figure 34. A Typical Bridge Application |
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