ADS7809U datasheet by Texas Instruments

ADS7809U Frequently Asked Questions (FAQs)

• What is the recommended input impedance for the ADS7809U?
  The recommended input impedance for the ADS7809U is 1 kΩ to 10 kΩ. This ensures proper signal attenuation and prevents signal reflections.
• How do I handle the output data format of the ADS7809U?
  The ADS7809U outputs data in a 16-bit, two's complement format. The most significant bit (MSB) is the sign bit, and the remaining 15 bits represent the magnitude of the signal.
• What is the purpose of the REFOUT pin on the ADS7809U?
  The REFOUT pin provides a buffered reference voltage output that can be used as a reference for other devices in the system. It is internally connected to the internal reference voltage generator.
• Can I use the ADS7809U in a multiplexed configuration?
  Yes, the ADS7809U can be used in a multiplexed configuration. However, it is essential to ensure that the multiplexer is properly synchronized with the ADC's conversion cycle to avoid signal distortion.
• How do I minimize noise and interference when using the ADS7809U?
  To minimize noise and interference, use proper PCB layout techniques, such as separating analog and digital grounds, using a solid ground plane, and shielding the ADC from nearby noise sources.