The recommended power-up sequence is to apply VDD first, followed by AVDD, and then the digital supply (VCC). This ensures that the internal analog and digital circuits are properly initialized.
The DAC7621 has a rail-to-rail output stage, but it's not guaranteed to swing all the way to the supply rails. To ensure maximum output voltage range, use an external op-amp to buffer the output and provide additional gain if needed.
The maximum clock frequency for the DAC7621 is 40 MHz, but it's recommended to operate at 20 MHz or lower to ensure reliable data transfer and minimize digital noise.
To implement a bipolar output voltage range, use an external op-amp to invert and scale the output voltage. You can also use a voltage reference (e.g., REF5025) to generate a negative voltage rail.
The settling time of the DAC7621 is typically around 3-5 μs, but it can vary depending on the output voltage range, load capacitance, and other factors. Consult the datasheet and application notes for more information.
DAC7621EB/1K datasheet
by Texas Instruments
