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bidirectional ADC with 24bit resolution

KDN Nandu
Intellectual 750 points
Other Parts Discussed in Thread: ADS1675

I am looking for ADC with 24bit resolution, bidirectional  sensing upto +/- 25V, communication protocol should be I2C 

  • 0
    TI__Expert 3870 points
    Hi KDN - Your post is in the incorrect E2E Forum so I'll move it to the correct one so you can get a quick answer.
    -JP
  • 0
    TI__Mastermind 23275 points
    Hi KDN,

    unfortunately I have to tell you that we (TI) do not offer any 24-bit ADC with I2C interface yet. Would an SPI interface be acceptable for you as well?
    Also I am not aware of any 24-bit ADC on the market that can directly measure a +/-25V signal. You would need some sort of signal conditioning in front of the ADC to attenuate your signal. In the simplest case you could use a resistor divider.

    What exactly do you mean by 'bidirectional sensing'?
    Is one of your signal inputs held at GND and the other one swings to 25V above GND and -25V below GND?

    What data rate are you looking for?

    Regards,
  • 0 in reply to Joachim Wuerker
    Intellectual 750 points

    Ok, SPI no problem, but ADC should be 24-bit, if more than 24-bit than better.

    I'll do anolog signal mixing for input signal.

    It should able to sense both positive and negative voltage/current (bidirectional sensing).  

    data rate should be 10MSPS (may be change)

     

  • 0 in reply to Joachim Wuerker
    Intellectual 750 points

    Is their any solution?

  • 0 in reply to KDN Nandu
    TI__Mastermind 23275 points
    Hi KDN,

    I am afraid there is no data converter available on the market that can achieve 24-bit of resolution when running at 10MSPS.
    The data converters that are available today only achieve 24bit resolution at very low data rates (100SPS or less).

    The ADS1675 is currently the fastest 24bit ADC we have available at TI. It can run at 4MSPS. However when you read the datasheet you will realize that you only get around 19 ENOBs at this data rate.

    Regards,