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AD5780 Datasheet(PDF) 25 Page - Analog Devices |
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AD5780 Datasheet(HTML) 25 Page - Analog Devices |
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25 / 28 page  Data Sheet AD5790 Rev. B | Page 25 of 28 Gain of Two Configuration (×2 Gain Mode) Figure 54 shows an output amplifier configured for a gain of two. The gain is set by the internal matched 6.8 kΩ resistors, which are exactly twice the DAC resistance, having the effect of removing an offset from the input bias current of the external amplifier. In this configuration, the output spans from 2 × VREFN − VREFP to VREFP. This configuration is used to generate a bipolar output span from a single ended reference input with VREFN = 0 V. For this mode of operation, the RBUF bit of the control register must be cleared to Logic 0. A1 6.8kΩ 6.8kΩ R1 RFB VREFP RFB INV VOUT VOUT 10pF 20-BIT DAC VREFN AD5790 AD8675 ADA4898-1 ADA4004-1 Figure 54. Output Amplifier in Gain of Two Configuration |
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