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ADS127L11: R94 of EVM schematic- what's this for?

Antenna_Head
Genius 12840 points
Part Number: ADS127L11

Tool/software:

Fig. 2-1 of EVM schematic indicates R94=3.01 Ohm in series with AVDD1.  What is it's purpose and is it required?  I'm not seeing a description for it.

  • +1
    TI__Mastermind 46880 points

    Hi Steve,

    The ADS127L11 has small internal bypass capacitors, in addition to the recommended external capacitors, and we have found that adding this external resistor results in lower noise and overall better performance of the ADC.  It is not necessary for functional operation of the device, but we always recommend including this resistor for improved noise performance.

    We do not specify this resistance, but any value in the range of 2Ohm to 4Ohm will work well, with 3Ohm as the typical value.

    Regards,
    Keith Nicholas
    Precision ADC Applications

  • 0 in reply to Keith Nicholas
    TI__Genius 12840 points

    Thanks much- would be great if you could update the datasheet, etc... with this info. 

    Thanks again!

    -Steve