• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 45 subscribers
  • Views 360 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.

LMP90100 Noise Free bits

Hithesh
Genius 3290 points
Other Parts Discussed in Thread: LMP90100

I was trying to find out the LMP90100 Noise free bits. 

From the histogram in the datasheet(page 16), the histogram width is 60uV

The FS Voltage is 3V. So for a 24Bit ADC, it takes about 8 bits to make ~60uV. So the Noise Free bits is 16?

  • 0
    TI__Mastermind 23275 points
    Hi Hithesh,

    the noise free resolution of LMP90100 depends on the gain, data rate, and reference voltage setting. Tables 1, 2 and 4 in the datasheet provide noise numbers for the different configurations.

    Your calculations seem to be correct as well. Unfortunately it is not stated at which data rate the histograms were taken:
    LSB size = 2x VREF / (2^24 x Gain) = 2x 3V / (2^24 x 1) = 358nV
    60uV/358nV = 168 codes
    log(168)/log(2) = 7.4 bits of peak-peak noise

    Regards,