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Data format description

Qianqian
Genius 5010 points

Part Number: ADS1292R

Dear TI Experts，

I am now using ADS1292RECG-FE and PC software to see the wave~

I'd like to know if their is data format description about it, I want to import it to matlab to do mora data analyse~

Thank you very much~

  • 0
    TI__Guru 56782 points
    Hello Fawn,

    Thanks for your post!

    Are you asking how to translate output codes to voltage such that it can be plotting in MATLAB?

    You can calculate the input voltage by using the equation below:

    VIN = (VREF / Gain) · (Code / 2^23)
  • 0 in reply to Alexander Smith
    Genius 5010 points
    Hello Alex,
    Very happy to see you again~
    You got what I mean~
    But sorry that I don't know exactly how to do it~
  • 0 in reply to Qianqian
    TI__Guru 56782 points
    Hi Fawn,

    Happy to help!

    No need to apologize. You can go to the "save" tab of the EVM software to output the codes to a text document. This can be imported into MATLAB, then you can perform the equation from my previous post in MATLAB and plot the resulting waveform.

    Does this make sense?
  • 0 in reply to Alexander Smith
    Genius 5010 points
    I got it~thank you ~
    Another question,now mr product CMRR is about -89dB
    I want to improve it~
    besides "Improving Common-Mode Rejection Using the Right-Leg Drive Amplifier" documents, what else documents can I refer to?
  • 0 in reply to Qianqian
    TI__Guru 56782 points
    Hello Fawn,

    I found this document, however I am not sure how useful it will be for you:
    www.ti.com/.../slyt737.pdf

    Theoretically, you could improve the CMRR of the signal chain past the threshold of the weakest link. Since the CMRR of the ADC is fixed, you could add a unity gain buffer amp in front of the ADC with a higher CMRR. This will attenuate the signal to the CMRR value of the opamp - which would be fed directly to the ADC. However, whatever noise is added to the signal in between the output of the opamp and the inputs of the ADC will be limited by the CMRR of the ADC.

    Does this make sense?