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PGA300: Digital compensation

Ryuuichi machida
Guru 12650 points
Part Number: PGA300

Hello,

I would like you to confirm about below.

* According to datasheet, third-order temperature coefficient (TC) and nonlinearity (NL) algorithm is implemented in PGA300.

I believe that this is realized by software(user can not change this code. in other words, "fixed" program).

However, according to above diagram, "digital gain" and "digital offset" portion are also implemented in this device.

TI describe how "digital offset", "digital gain" and "TC and NL" are used in "7.3.17.1 Digital Gain and Offset" and "7.3.17.2 TC and NL Correction".

However, there is no description about how user can get coefficient "a0,a1,b0,b1,hx,gx,nx,mx".

The question is below.

1. Are coefficient "a0,a1,b0,b1,hx,gx,nx,mx" calculated automatically in PGA300 internally ?

2. If so, how user can get above coefficent ?

Best Regards,

  • 0
    TI__Mastermind 31655 points

    Hi Machida-san,

    The coefficients are not calculated internally. The simplest way to calculate the coefficients is to use the EVM GUI. You can communicate directly with the device to read ADC values at your specific calibration points, and the GUI will calculate the coefficients for you.

    Please reference the PGA300 GUI User's Guide: 

    Regards,

  • 0 in reply to Scott Cummins
    Guru 12650 points

    Hello Scott-san,

    Thank you for your reply.

    >The simplest way to calculate the coefficients is to use the EVM GUI. You can communicate directly with the device to read ADC values at your specific calibration points, and the GUI will calculate the coefficients for you.

    Yes, I understood about above. Customer use this GUI.

    However, when customer move production stage. they need to generate evaluation environment (user can not use EVM because this EVM can evaluate only one device at one time.)

    So, they need to understand how these coefficients are calculated. Could you please confirm how these coefficients are calculated ?

    Best Regards,

  • 0 in reply to Ryuuichi machida
    TI__Mastermind 31655 points

    Hi Machida-san,

    Can you please email me directly?

    Thanks,

  • 0 in reply to Scott Cummins
    Guru 12650 points

    Hello Scott-san,

    I have already sent email you directly.

    Could you please send me your feedback ?

    BR,