[SOLVED] ADC code from Analog to digital converter

[2ndhandscope]

Hello,
I cam across a video on you tube,
Ratiometric config with RTD
and this video is from TI by the way :


In the video, the lecturer says the ADC_Dout= Vin * Gain * 2^24 / (2 Vref). I believe this is incorrect, it should be just Vref , am I right ?

Thank you !

 

[FvM]

To answer the question, you'll want to review the LMP90100 dataheet. If you do, you'll notice that it has a bipolar (+/- Vref/Gain) input range. Thus the calculation is right.

 

[2ndhandscope]

Thank you, you are right, I should have looked into the datasheet, the formula is right in it.

 

[Rk_on_edaboard]

hi 2ndhandscope
i want to more information about lmp90100
i cant get it from datasheet. i want to know that how to calculate the voltage from the output code of the lmp 90100?

 

[KlausST]

Hi,

it is just the same formula.

you must use it the other way round.

Vin = ADC_Dout * 2 * VRef / ( gain * 2^24)

Klaus