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ADS124S08: Technical Support required to find the Alternate part for ADS124S08

Sahil Nayak
Prodigy 140 points
Part Number: ADS124S08
Other Parts Discussed in Thread: ADS131M08, ADS1261, TMUX1308

Tool/software:

Hi TI Team,

We are currently using the ADS124S08 for RTD and strain gauge bridge sensor data acquisition in one of our projects. Now, we are looking to replace the ADS124S08 ADC with one that has a higher sampling rate (while keeping all the other specifications required to be the same). I explored a bit and found a part ADS131M08. However, this part doesn't have internal current source excitation.

Kindly suggest a similar part with a higher sampling rate (10ksps ~ 30ksps) that supports internal current source excitation. Let me brief you on the requirements in detail as mentioned below:

- Resolution: 24 bits
- Sampling rate: 10ksps ~ 30ksps
- Architecture: Delta Sigma ADC
- Interface: SPI
- Input channels: 8/12
- Required internal current source excitation.

If internal current source excitation is not available, kindly suggest a way to add them externally and share the design reference. 

Thanks & Regards,
Sahil Nayak

  • 0
    TI__Guru 53976 points

    Hi Sahil Nayak,

    Try using the ADS1261. The feature set is almost identical to the ADS124S08 (current sources, low noise PGA, clock, reference, etc.). But this device can sample up to 40kSPS and offers 11 input channels.

    Let us know if you need anything else

    -Bryan

  • 0 in reply to Bryan Lizon86
    Prodigy 140 points

    Hi Bryan,

    Thank you for your quick and accurate response.

    Does ADS1261 support simultaneous sampling? Also, it has 10 input channels.

    Do you have any part suggestions with 12 input channels and a sampling rate of 10k - 30k? If there are no internal current sources for this, could you suggest methods to add the current source excitation externally? A design reference would be a great help.

    Thanks & Regards,
    Sahil Nayak

  • +1 in reply to Sahil Nayak
    TI__Guru 53976 points

    Hi Sahil Nayak,

    Neither of the ADCs we have discussed (ADS124S08 or ADS1261) support simultaneous sampling, they are both multiplexed ADCs

    ADS1261 has 11 channels (AIN0-AIN9, and AINCOM)

    We don't have anything at the moment that meets all of your requirements, but we are developing a device right now that will have >12 channels and sample rates >30kSPS. If you want more information about that device please follow up with us at the beginning of October when the information should be available publicly

    Alternatively, it would probably be easier to just use the ADS1261 with an external multiplexer instead of designing your own current sources. Something like TMUX1308 is very low cost and offers and 8:1 option that can dramatically increase the number of input channels to the ADC. The ADS1261 also has GPIOs shared with some of the analog pins that can be used to control the mux

    -Bryan

  • 0 in reply to Bryan Lizon86
    Prodigy 140 points

    Hi Bryan,

    Noted. Thanks for the updates and helpful information.

    Thanks & Regards,
    Sahil Nayak