The AD5791 (U1) is used as a precision digitally controlled 1 ppm voltage source with a ±10 V range and 20 μV increments, the AD8676 (U2) is used as a reference buffer, and the AD8675 (U3) is used as an output buffer. The absolute accuracy depends on the choice of the external 10 V reference.
Figure 3. A 1 ppm accurate system using the AD5791 DAC.
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