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AD8205WHRZ-RL Folha de dados(PDF) 9 Page - Analog Devices |
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AD8205WHRZ-RL Folha de dados(HTML) 9 Page - Analog Devices |
9 / 12 page Data Sheet AD8205 Rev. | Page 9 of 12 OUTPUT OFFSET ADJUSTMENT The output of the AD8205 can be adjusted for unidirectional or bidirectional operation. UNIDIRECTIONAL OPERATION Unidirectional operation allows the AD8205 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 the case of unidirectional operation, the output could 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 100 mV. The required polarity of the differential input depends on the output voltage setting. If the output is set at the positive rail, the input polarity needs to be negative to move the output down. If the output is set at ground, the polarity is positive to move the output up. GROUND REFERENCED OUTPUT When using the AD8205 in this mode, both reference inputs are tied to ground, which causes the output to sit at the negative rail when there are zero differential volts at the input (see Figure 14). AD8205 +IN –IN NC NC = NO CONNECT GND V+ OUT VREF1 VREF2 Figure 14. Ground Referenced Output Table 4. V+ = 5 V VIN (Referred to −IN) VO 0 V 0.05 V 100 mV 4.8 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 the wiring before power is applied to the load (see Figure 15). AD8205 +IN –IN NC NC = NO CONNECT GND V+ OUT VREF1 VREF2 Figure 15. V+ Referenced Output Table 5. V+ = 5 V VIN (Referred to −IN) VO 0 V 4.8 V 100 mV 0.05 V BIDIRECTIONAL OPERATION Bidirectional operation allows the AD8205 to measure currents through a resistive shunt in two directions. In this case, the output is set anywhere within the output range. Typically, it is set at half-scale for equal 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 with VIN = 0 V VIN (Referred to −IN) VO +40 mV 4.5 V −40 mV 0.5 V Adjusting the output is accomplished by applying voltage(s) to the reference inputs. VREF1 and VREF2 are tied to internal resistors that connect to an internal offset node. There is no operational difference between the pins. D |
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