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Going from ADS9110EVM to ADS8678EVM software

Tom Campbell
Prodigy 70 points
Other Parts Discussed in Thread: ADS9110, ADS8678

Need a larger input voltage range for our ADC we intend to use in a medical products. Currently using the ADS9110EVM. We need high resolution, but would like to expand the input voltage up to 10V. The ADS9110EVM limits us to 2.25V. What demo product can you recommend for high SNR, 500ksps, and 5, 8 or 10V input range?

I downloaded the ADS8678EVM software that is quite different from the ADS9110EVM software.

It show an amplitude range of -6 to +6V.  Is this the max range?  I was hoping to be able to work with the full output range of our detector at 0 to 10V.

With the ADS9110EVM, I could select the number of samples to capture, however, it seems that I have to play with the sample rate to vary the number of samples captured.  Am I wrong on this?

  • 0
    TI__Expert 5575 points

    Hi Tom

    Can you please let me know below details

    1. Input voltage range

    2. Is your input signle ended or differential. if it is differential then what is the absolute max voltage swing on each input

    ADS9110 EVM supports 9V differential input voltage swing (4.5V onboard reference).

    There is one more option you can consider ADS8910. It is 18bit, 1MSPS differential ADC with internal reference buffer.

    Please let me know if you need any additional information from my side

    Thanks & Regards

    Abhijeet

  • 0 in reply to Abhijeet Godbole
    Prodigy 70 points

    Dear Abhijeet:

    In my notes, I listed the goal of 0 to 10V detection.  We have a single ended SMA RG-174 cable coming from our detector.

    I listed questions on the software for the ADS8678 that is different from the ADS9110:

       I downloaded the ADS8678EVM software that is quite different from the ADS9110EVM software.

       It shows an amplitude range of -6 to +6V.  Is this the max range?  I was hoping to be able to work with the full output range of our detector at 0 to 10V.

       With the ADS9110EVM, I could select the number of samples to capture, however, it seems that I have to play with the sample rate to vary the number of samples captured.  Am I wrong on this?

    I don't see the benefit of the ADS8910 over the ADS9110.

    Rgds,

    Tom

  • 0 in reply to Tom Campbell
    TI__Expert 5575 points

    Hi Tom

    ADS8678 can support 0 to 10V input range. For unipolar applications ADS8678 input can be configured from 0V to  2.5 x VREF, 0V to 1.25 x VREF, 0V to  0.625 x VREF,0V to 0.3125 x VREF. ADS8678 has  4.096V internal reference.

    ADS8678 EVM GUI allows you to select input voltage range mentioned above along with few other options for bipolar application. Can you attach screenshot of GUI you are using which is showing you +/- 6V amplitude range.

    Regarding ADS9110 eVM GUI there is no relation between number of samples to capture and sampling rate. You should be able to change number of samples to capture without changing sampling speed.

    Can you please let me know below inputs so that I can help you with most suitable device for your application

    1. Sampling rate required

    2. ADC Resolution

    3. End application:

    Thanks & Regards

    Abhijeet

  • 0 in reply to Abhijeet Godbole
    Prodigy 70 points

    Dear Abhijeet:

    Thank you for confirmation on the multiplier of 2.5 for the 4.096Vref.  We are sampling at 10kHz to 100kHz and would like as high a resolution as possible, hence our interest in the 24 bits.  End application is a personal medical device that could run in high quantity.

    I expect to proceed with the ADS8678EVM-PDK.


    Thanks,

    Tom