• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 46 subscribers
  • Views 347 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1258 parameters

Joaquin Gonzalez
Expert 1200 points
Other Parts Discussed in Thread: ADS1258

Hi to everyone,

I am thinking about using ADS1258 but I don't find the following parameters for this device:

SINAD

SNR

SFDR

Does anybofy know it?

Thanks in advance.

  • 0
    TI__Mastermind 43915 points

    Nuba, 

    Is your application AC or DC oriented? I would assume that your application is monitoring some sort of AC input signal. If that is the case, I would recommend looking at one of our SAR converters, maybe the ADS795x series parts. AC specs are going to be better when going to a SAR converter. Delta-sigma converters are focused towards DC applications. 

    Regards,

    Tony Calabria

  • 0 in reply to Tony Calabria
    Expert 1200 points

    Hi Toni,

    I am goint to monitor sensor outputs and do some DC supply tracking. I thought that this AD would be OK since it can produce sensor bias current, and their main aplication are Measurrement systems and Instumentation.

    Right now I am using a Pipeline ADC embebed in a C2000, but I need more resolution, EP version and 16 channels. That is why I am thinking about ADS1258EP.

    Would this ADC be ok for MEMS sensors and DC supply tracking? The cut frequency  of my filter before the ADC will be 50 Hz, so I guess my app. is not considered "true AC".

    Anyway, I would like to know these parameter if anybody know them.

    Thnaks in advance.

     

     

     

  • 0 in reply to Joaquin Gonzalez
    TI__Expert 6925 points

    Hello Nuba,

    It is possible to estimate AC parameters from figure 27 of the datasheet:

    @ 1kHz
    Noise floor ≈ 140dB
    SFDR ≈ 110dB
    THD  ≈ -111dB
    SNR ≈ SINAD ≈ between 100dB to 110dB

    @ 50Hz
    Since the noise floor is about 140dB, the SNR should improve significantly if the inputs are properly filtered. Just be careful with settling time.

     

    Regards,

  • 0 in reply to Rafael Ordonez
    Expert 1200 points

    Thanks a lot for you help guys.