Digital Interface FAQ - Sigma Delta ADC

  1. How does the serial interface operate?
  2. What is the recommended initialization sequence?
  3. Are there any precautions that should be taken to make the interface more robust?
  4. If the interface does get corrupt, what are the options to regain control of the ADC?
  5. How do I interface to multiple ADCs over the same serial interface?
  6. When reading from the ADC, only the first read after power-up is successful. All subsequent read operations give invalid results. What could be happening?
  7. When single conversion mode is used, can /CS be taken high after the single conversion is initiated?
  8. When information (conversion data or information from the on-chip registers) is read from the ADC, the LSB read back is always 1. Why?
  9. What is the \SYNC pin and how do I use it? Can I leave this open when unused?
  10. Does DOUT/RDY become High-Z when /CS is high?
  11. DOUT/RDY is not working or never goes low. What should I do?
  12. Data available on DOUT is invalid or is not updating. What is wrong?
  13. Data output clamped to all zeros or 1s. Why? 
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  • 0
    •  Analog Employees 
    on Sep 17, 2017 5:50 PM

    Hi,

    Yes, tying DIN high between write operations prevents invalid data being written to the ADC. It might be a different case when AD7190 is in continuous conversion read mode. Because in this read mode, the part also monitors the DIN and 40 consecutive 1s will reset the chip. Unlike in the standard read mode the ADC only monitors the DOUT line and don't care the DIN line during this read operation.

    Thanks,

    Jellenie

Reply
  • 0
    •  Analog Employees 
    on Sep 17, 2017 5:50 PM

    Hi,

    Yes, tying DIN high between write operations prevents invalid data being written to the ADC. It might be a different case when AD7190 is in continuous conversion read mode. Because in this read mode, the part also monitors the DIN and 40 consecutive 1s will reset the chip. Unlike in the standard read mode the ADC only monitors the DOUT line and don't care the DIN line during this read operation.

    Thanks,

    Jellenie

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