DAC9881SBRGER datasheet by Texas Instruments

DAC9881SBRGER Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the DAC9881?
  The recommended power-up sequence is to apply VDD first, followed by VREF, and then the digital interface signals (SCLK, SDIN, and SYNC). This ensures proper device operation and prevents potential latch-up conditions.
• How do I handle the output voltage range of the DAC9881?
  The DAC9881 has a rail-to-rail output stage, but the output voltage range is limited by the VREF voltage. Ensure that the output voltage range is within the specified VREF range (0.5V to VDD-0.5V) to maintain linearity and accuracy.
• What is the purpose of the SYNC pin, and how do I use it?
  The SYNC pin is used to synchronize the data transfer between the microcontroller and the DAC9881. It is an active-low input that, when low, loads the data from the shift register into the DAC register. Ensure that the SYNC pin is low for at least one clock cycle to guarantee data transfer.
• How do I achieve the best possible linearity and accuracy with the DAC9881?
  To achieve the best possible linearity and accuracy, ensure that the VREF voltage is stable and well-regulated, and that the output load is within the specified range (1kΩ to 10kΩ). Additionally, use a low-noise power supply, and minimize digital noise coupling into the analog circuitry.
• What is the maximum data transfer rate for the DAC9881?
  The maximum data transfer rate for the DAC9881 is 50 MHz, which corresponds to a minimum clock period of 20 ns. Ensure that the clock frequency is within this range to guarantee reliable data transfer.