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ADS1220 Vs. ADS1231

Shawn Smith92
Prodigy 10 points
Other Parts Discussed in Thread: ADS1231, ADS1220, ADS122U04, ADS122C04

Hello Texas Instruments,

I was curious how the ADS1220 varies from the ADS1231 I understand that they are both 24bit ADCs and they are very similar. The ADS1220 seems to be faster I was curious if I could get a more detailed breakdown on the differences between the two.

Best Regards,

Shawn

  • 0
    TI__Mastermind 23275 points
    Hi Shawn,

    welcome to our e2e forum and thanks a lot for your question and interest in our ADCs.

    I can understand that from a parametric search on ti.com it is not always easy to determine the differences between the various ADCs and which ADC would be the best fit for a specific application.
    If you could tell me a little more details about what you are trying to measure, I could probably point you to the most suitable ADCs for your needs.

    The ADS1231 was specifically developed for resistive bridge type measurements, mostly for weigh scale applications actually. It offers all the features that are usually required to implement a ratiometric bridge measurement - most importantly a high input impedance PGA and a differential reference input.

    The ADS1220 was developed for a wider variety of sensor measurements, such as thermistor, RTD, thermocouple, and resistive bridge, etc. measurements. It therefore offers a few more integrated features. For example a voltage reference, more PGA gain settings, excitation current sources for RTD measurements, more input channels, higher data rates, etc. The device is used a lot in 4-20mA loop-powered field transmitters, therefore low power consumption was also critical for the ADS1220. It comes in a much smaller package than the ADS1231 as well.

    You probably know that a 24-bit Delta-Sigma ADC does not necessarily provide truly 24 bits of resolution.
    When you look at the noise tables in the datasheets you will realize that both ADCs offer an Effective Resolution closer to 19-20 bits at the lowest data rates.
    The ADS1231 offers slightly better effective resolution but does therefore also consume slightly more power. Means if you were to implement a weigh scale for example you might get slightly better noise free codes with ADS1231.

    In case you prefer a different serial interface than SPI, we offer versions of ADS1220 also with I2C (ADS122C04) and UART (ADS122U04) interfaces.

    Let me know how I can further guide you to the best solution.

    Regards,