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AD8206YCSURF Arkusz danych(PDF) 10 Page - Analog Devices |
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AD8206YCSURF Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 12 page AD8206 Rev. 0 | Page 10 of 12 EXTERNAL REFERENCED OUTPUT Tying both pins together and to a reference produces an output equal to the reference voltage when there is no differential input (see Figure 19). The output moves down from the reference voltage when the input is negative, relative to the −IN pin and up when the input is positive, relative to the −IN pin. AD8206 +IN –IN NC NC = NO CONNECT GND V+ OUT VREF1 VREF2 2.5V VOLTAGE REFERENCE Figure 19. External Referenced Output SPLITTING THE SUPPLY By tying one reference pin to V+ and the other to the ground pin, the output is set at half of the supply when there is no differential input (see Figure 20). The benefit is that no external reference is required to offset the output for bidirectional current measurement. This creates a midscale offset that is ratiometric to the supply, which means that if the supply increases or decreases, the output remains at half the supply. For example, if the supply is 5.0 V, the output is at half scale or 2.5 V. If the supply increases by 10% (to 5.5 V), the output goes to 2.75 V. AD8206 +IN –IN NC NC = NO CONNECT GND V+ OUT VREF1 VREF2 Figure 20. Split Supply SPLITTING AN EXTERNAL REFERENCE In this case, an external reference is divided by 2 with an accuracy of approximately 0.5% by connecting one VREF pin to ground and the other VREF pin to the reference (see Figure 21). AD8206 +IN –IN NC NC = NO CONNECT GND V+ OUT VREF1 VREF2 5V VOLTAGE REFERENCE Figure 21. Split External Reference |
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