DAC7821IPW datasheet by Texas Instruments

DAC7821IPW Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the DAC7821IPW?
  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.
• How do I ensure accurate voltage output from the DAC7821IPW?
  To ensure accurate voltage output, it is 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.
• What is the maximum output current of the DAC7821IPW?
  The maximum output current of the DAC7821IPW is 5 mA. Exceeding this current may cause damage to the device or affect its accuracy.
• How do I handle the DAC7821IPW's digital inputs during power-up and power-down?
  During power-up and power-down, it is recommended to keep the digital inputs in a high-impedance state or tie them to a fixed logic level to prevent unwanted transitions and ensure proper device operation.
• What is the recommended layout and routing for the DAC7821IPW?
  To minimize noise and ensure accurate operation, it is recommended to use a star-ground configuration, keep analog and digital traces separate, and use a solid ground plane. Additionally, place the voltage reference close to the DAC and use a low-ESR capacitor for decoupling.