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AD8210WYC-P3 Datasheet(PDF) 11 Page - Analog Devices |
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AD8210WYC-P3 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page Data Sheet AD8210 Rev. C | Page 11 of 16 MODES OF OPERATION The AD8210 can be adjusted for unidirectional or bidirectional operation. UNIDIRECTIONAL OPERATION Unidirectional operation allows the AD8210 to measure currents through a resistive shunt in one direction. The basic modes for unidirectional operation are ground referenced output mode and V+ referenced output mode. In unidirectional operation, the output can be set at the negative rail (near ground) or at the positive rail (near V+) when the differential input is 0 V. The output moves to the opposite rail when a correct polarity differential input voltage is applied. In this case, full scale is approximately 250 mV. The required polarity of the differential input depends on the output voltage setting. If the output is set at ground, the polarity needs to be positive to move the output up (see Table 5). If the output is set at the positive rail, the input polarity needs to be negative to move the output down (see Table 6). Ground Referenced Output When using the AD8210 in this mode, both reference inputs are tied to ground, which causes the output to sit at the negative rail when the differential input voltage is zero (see Figure 27 and Table 4). AD8210 OUTPUT G = +20 RS +IN –IN VS VREF1 VREF2 GND 0.1µF Figure 27. Ground Referenced Output Table 4. V+ = 5 V VIN (Referred to −IN) VO 0 V 0.05 V 250 mV 4.9 V V+ Referenced Output This mode is set when both reference pins are tied to the positive supply. It is typically used when the diagnostic scheme requires detection of the amplifier and wiring before power is applied to the load (see Figure 28 and Table 5). AD8210 OUTPUT G = +20 RS +IN –IN VS VREF1 VREF2 GND 0.1µF Figure 28. V+ Referenced Output Table 5. V+ = 5 V VIN (Referred to −IN) VO 0 V 4.9 V −250 mV 0.05 V BIDIRECTIONAL OPERATION Bidirectional operation allows the AD8210 to measure currents through a resistive shunt in two directions. The output offset can be set anywhere within the output range. Typically, it is set at half scale for equal measurement range in both directions. In some cases, however, it is set at a voltage other than half scale when the bidirectional current is nonsymmetrical. Table 6. V+ = 5 V, VO = 2.5 V with VIN = 0 V VIN (Referred to –IN) VO +125 mV 4.9 V −125 mV 0.05 V Adjusting the output can also be accomplished by applying voltage(s) to the reference inputs. |
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