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.
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.
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.
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.
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.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
