• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 47 subscribers
  • Views 3978 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.

LOW power design for strain gauge amplifier

ssb
Prodigy 50 points
Other Parts Discussed in Thread: ADS1231

Hi,

I am using a strain gauge configured in a full bridge ckt (Wheatstone Bridge). The resistance of the bridge is 2 K which takes the current consumption to @ 1.65 mv. 

 I developing an application that is battery operated and the battery has to last atleast for 1 year, which means my over all current consumption has to be in micro-watts. I tried putting 100K resistor in each arm of the bridge but in that case I guess the current is so low that the voltage is not amplified  by OPA 333.Also which is the characteristic that I should look for in the datasheet to understand if the device would help me

Please suggest me a solution.

Thanks in advance

Kind Regards


Suchitra

  • 0
    TI__Guru* 94295 points

    I don't know if this helps, but you would get further if you could turn off the bridge when not in use.

    You could use a switch or multiplexer to disconnect the power at times when the circuit is idle. If you are using some sort of ADC, you might want to consider the ADS1231, which has a switch to disconnect the bridge when not in use. Note that the ADS1231 is in development at this time and should be out later this year.

    You can find information about the ADS1231 here:

    http://focus.ti.com/docs/prod/folders/print/ads1231.html

    Joseph Wu