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ADS1248: Internal accuracy calculation

Zoe Yang
Intellectual 2210 points

Part Number: ADS1248

Dears,

ADS1248's resolution is 24 bits. But what is the sampling accuracy inside of the converter? Say in an ADC, internal errors includes Reverence voltage error, PGA error, Quantization error, etc...Can you specific these sampling errors by using calculation formulas?

Another question is that in below measurement system, what is the total system sampling errors including internal errors together with external circuit errors? 

  • 0
    TI__Guru 55901 points

    Hi Zoe,

    You might try reviewing our Precision Labs - ADC material, specifically the sections on Error Sources and Noise: https://training.ti.com/ti-precision-labs-adcs

    Typically uncorrelated error sources are added together using the root sum of squares (RSS) method, where each term is squared, all terms are added together, and then take the square root to find the final value. This is discussed in the Precision Labs training material.

    For thermocouples specifically, we have an application note "A Basic Guide to Thermocouple Measurements". This document contains lots of information about the many different ways to measure a thermocouple and how to consider the error sources in the system: https://www.ti.com/lit/sbaa274

    Please review this information and let me know if you have any specific questions. Thanks!

    -Bryan