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ADS1256 vs LMP90099

antti.ryhanen
Prodigy 10 points
Other Parts Discussed in Thread: LMP90099, ADS1256

Hello all!

I'm trying to select an AD converter for a measurement device application. I need an AD with 4 differential channels, preferably a 24-bit sigma-delta one. I narrowed my search down to two choices: ADS1256 or LMP90099. What is the actual practical difference? My signal to be measured is a steady one (somewhat noisy, but the average remains steady over the sampling period), so I don't need speed but accuracy is my priority. I have approx 1 second time to sample the signal. So I'm measuring a slow signal, top accuracy required, which one is better?

Br,

Antti Ryhänen

FinMeas Ltd

  • 0
    TI__Mastermind 44680 points

    Hello Antti!

    Welcome to the TI E2E forums and great question!

    Regarding the differences between these two devices, the LMP90099 has some extra features which are found in some of the ADS124x devices as well; such as, programmable current sources for biasing resistive sensors and multiple reference inputs for convenient ratiometric measurements. The LMP90099 also has an background calibration that runs continuously. The LMP90099 is lower power than the ADS1256 and costs less.

    The ADS1256 is part of the ADS125x family which are some of our lowest noise devices. In general, this part will out perform the LMP90099. You will have to program and decide how often to run a calibration, but it will be easier to configure this part because it has a much smaller register. The ADS1256 also has a much faster output data rate and a programmable digital filter.

    Regards,
    Chris