• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 262 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS8166: DVDD Specified vs. Operating - Support 1.8V?

Brian Gosselin
Expert 4745 points
Part Number: ADS8166

Hello,

My customer is interested in using ADS8166 with DVDD = 1.8V, however, the device states that it's specified DVDD is from 2.35V to 5.5V (3V typical) even though it's operating DVDD is from 1.65V to 5.5V (3V typical).

Do you have any concerns regarding using DVDD = 1.8V?  Is there anything they'd need to watch out for?

I did see other E2E post where TI was recommending eliminating voltage level translators and using DVDD = 1.8V for the ADS816x, so this appears to be an acceptable use case.

The datasheet is also missing the digital input and output levels (Vih/l and Voh/l).  For DVDD = 1.8V, should they use 0.8*DVDD for Vih/Voh min and 0.2*DVDD for Vil/Vol max?  This seems to align with the conditions in the fclk spec (serial clock frequency) of 20MHz max for SPI interface.  However, there's no indication for what to expect for Voh/Vol.

Thanks in advance for your support.

Best Regards,
Brian Gosselin

  • 0
    TI__Expert 4745 points

    Hi All,

    Feedback from our PL is that you can use the ADS892x datasheet specs for digital inputs and outputs since that device and ADS8166 share the same digital IO cells.

    The ADS8166 will work well with 1.8V digital when using SPI; the exceptions are reductions in SCLK frequency, which may limit the maximum conversion rate for the higher speed versions of the device, but not the lower speed ADS8166.

    Best Regards,
    Brian Gosselin

  • +1 in reply to Brian Gosselin
    TI__Guru 66446 points

    Thank you, Brian! I saw that Keith clarified your questions via email. Let us know if you or the customer need any more help.

    Regards,

    Ryan