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TMP116: power ripple issue

Matthew.huang
Prodigy 250 points
Part Number: TMP116

Hi All, I am using the tmp116n chip in a temperature device, but i have a  questions need you help to solve.

In my desgin,the power ripple of the tmp116n is about 300-400mv,and the frequence of the ripple is about 10Hz.so,i want to know dose this ripple may have a bad affect on the tmp116n's accuracy?

Thanks!

  • 0
    TI__Mastermind 39425 points
    Hi Matthew,

    Have you provided a bypass capacitor near the TMP116 device? The power situation isn't ideal, but may not be harmful depending on the accuracy you wish to achieve.

    The TMP116 has good power supply rejection as shown in the temperature accuracy table. We offer the highest accuracy at 3.3V. When expanding the supply range to 3.0 to 3.6, we only decrease the accuracy specification by 0.1 typical. There is also an increase in temperature range that plays a role in the accuracy de-rating. Finally, across the whole supply range of of 1.9 to 5.5V, we only decrease accuracy 0.1C further to 0.5C max.

    Thanks,
    Ren
  • 0
    TI__Prodigy 355 points

    Hello Mathew.

    For precise measurements it is better get rid of ripples where they are originated. But another solution is to use a RC circuit in TMP116 supply line. Because TMP116 consumes only 0.13mA you can use resistance like 5-10KOhm and not very big electrolitical cap (10-30uF) to fight 10Hz. If it for some reasons is not possible then you should consider to switch to some averaging mode. The internal averaging for 500mSec (if it is acceptable) should eliminate the ripple effect.

    Regards, Michael