The TI E2E™ design support forums will undergo maintenance from July 11 to July 13. If you need design support during this time, open a new support request with our customer support center.

  • State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 46 subscribers
  • Views 275 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

ADS7052: Supply current

Liu Yang
Expert 8295 points
Part Number: ADS7052

Hi Team,

I have two questions about supply current of ADS7052.

Supply current is shown on datasheet as below.

Do you have IDVDD for DVDD=3.0V?

Does the line marked in yellow mean that CS and SCLK have a significant impact on the consumption current on intermittent operation? Also, is it possible to intermittently drive with CS and SCLK high to reduce the current consumption of the digital part?

 


Best Regards,
Tom

  • +1
    TI__Guru**** 179661 points

    Hi Liu,

    Please review the datasheet - section 10.2.1 Estimating Digital Power Consumption

  • 0 in reply to Tom Hendrick
    TI__Expert 8295 points

    Hi Tom,

    I am a bit confused about your answer to the second question.

    Also, for the first question, do you have IDVDD for DVDD=3.0V?

  • 0 in reply to Liu Yang
    TI__Guru**** 179661 points

    Hi Liu,

    The answer to both questions is in section 10.2.1 of the datasheet.  IDVDD is the digital current which is equal to Cload_sdo × V × F.  Use the noted 20 pF of the load capacitance on SDO X 3.0 X SCLK speed.  I do not know what your SCLK speed is, so I can't answer your IDVDD question directly.  In the highlighted portion of the table, the word 'static' means the part is idle (i,e, not converting), which is the same thing as being operated 'intermittently'. So yes, there is a direct relationship to IVDD when the device is idle versus in a converting state.  There is also a relationship to IDVDD depending on the conversion result - which is also noted in section 10.2.1.