| The AD5422 has an internal 10-ppm/°C max voltage reference that can be enabled on all four output channels in the PLC evaluation system. Alternatively, the ADR445 ultralow-noise XFET? voltage reference, with its 0.04% initial accuracy and 3 ppm/°C, can be used on two output channels, allowing performance comparison and a choice of internal vs. external reference, depending on the total required system performance.
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