DAC7621EG4 datasheet by Texas Instruments

DAC7621EG4 Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the DAC7621EG4?
  The recommended power-up sequence is to apply VDD first, followed by VREF, and then the digital supply (VCC). This ensures that the internal reference voltage is stable before the DAC starts operating.
• How do I ensure accurate voltage output from the DAC7621EG4?
  To ensure accurate voltage output, it is essential to use a low-noise, low-impedance voltage reference (VREF) and to decouple the VREF pin with a capacitor (e.g., 10nF) to reduce noise. Additionally, use a stable clock signal and ensure that the DAC is operated within its specified temperature range.
• What is the maximum clock frequency that can be used with the DAC7621EG4?
  The maximum clock frequency for the DAC7621EG4 is 40MHz. However, it is recommended to use a clock frequency of 20MHz or less to ensure reliable operation and to minimize digital noise.
• Can I use the DAC7621EG4 in a ratiometric configuration?
  Yes, the DAC7621EG4 can be used in a ratiometric configuration, where the output voltage is proportional to the reference voltage (VREF). This can be useful in applications where the output voltage needs to track changes in the reference voltage.
• How do I handle the DAC7621EG4's power-down mode?
  When the DAC7621EG4 is in power-down mode, the output voltage is high-impedance, and the device consumes minimal power. To exit power-down mode, simply bring the PD pin high. Note that the DAC7621EG4's output voltage may take some time to settle after exiting power-down mode.