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ADS127L11: REF4061 + ADS127L11 + THS4551 Solution

Francis Jiang
Expert 3160 points
Part Number: ADS127L11
Other Parts Discussed in Thread: REF6041, THS4551, , REF54, REF70, THP210

Tool/software:

Hi Team,

Customer choose REF4061 + ADS127L11 + THS4551 solution, under 1MSPS condition. He followed TI's recommendations exactly, but wanted to know more about why TI chose REF6041 and THS4551. Is there a deeper reason? Thanks.

  • REF6041, the output impedance buffer?
  • THS4551, capacitive load matching?

BRs,

Francis

  • 0
    TI__Mastermind 46200 points

    Hello Francis,

    REF60:

    This reference family has a high speed buffer, and works well with the ADS127L11 REFP buffer enabled or disabled.  I have used this on many other ADCs with good results, which is the primary reason I chose this particular reference.  However, when enabling the internal REFP buffer, I have tested the REF54 and REF70 families and see very good performance as well.  Conclusion, a good low noise reference with at least 4mA of drive current can be used with the ADS127L11.

    THS4551:

    The primary reason THS4551 was used on the EVM is the wide input common mode range, allowing the amplifier to support multiple input configurations when using a single 5V power supply.  THS4551 also provides excellent AC performance and decent low frequency DC performance, which allows for a wide range of user applications. 

    If you plan to operate at very low data rates near DC, then the THP210 is a better choice, due to its reduced low-frequency noise.  We have an application note that looks at the THP210+ADS127L11 configuration.  Most amplifiers with 10MHz or greater bandwidth can be used to drive the ADS127L11 inputs.

    https://www.ti.com/lit/pdf/sboa546

    Regards,
    Keith Nicholas
    Precision ADC Applications