The recommended power-up sequence is to apply VCC first, followed by AVCC, and then the digital inputs. This ensures that the internal voltage regulators are powered up correctly.
To ensure accurate voltage output, it's essential to use a high-quality voltage reference, such as the Texas Instruments REF5025. Additionally, ensure that the output voltage is buffered with an op-amp, such as the OPA333, to prevent loading effects.
The maximum output current of the DAC7821 is 5mA. Exceeding this current may cause damage to the device or affect its accuracy.
To prevent latch-up or damage, ensure that the digital inputs are not driven before the power supplies are stable. Also, use a series resistor (e.g., 1kΩ) to limit the input current and prevent damage from overvoltage or electrostatic discharge.
To minimize noise and ensure accurate performance, use a star-ground topology, keep analog and digital traces separate, and avoid running digital traces near the analog output. Also, use a solid ground plane and decouple the power supplies with 0.1μF and 10μF capacitors.
DAC7821IPWR datasheet
by Texas Instruments
