Design Description

This application note describes how to design a power supply to power the high voltage output of the DAC81416 using a single 12-V input. The proposed power supply is capable of providing 500 mA of current for a high-voltage output from the DAC. The DAC81416, DAC71416, and DAC61416 (DACx1416) are a pin-compatible family of 16-channel, buffered, high-voltage output digital-to analog converters (DACs) with 16-bit, 14-bit, and 12-bit resolution. A user-selectable output configuration enables full-scale bipolar output voltages of ±20 V, ±10 V, ±5 V or ±2.5 V, and full-scale unipolar output voltages of 40 V, 20 V, 10 V or 5 V.

The DACx1416 requires five power-supply inputs: VIO, VDD, VAA, VCC, and VSS. VDD and VAA should be at the same level. For high-voltage output options like ±20 V, VCC and VSS should be ±24 V to account for the headroom and footroom requirements for the output buffer of the DAC81416. For unipolar output voltage (0 V to 40 V), the minimum VCC supply required is 42 V.