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ADS127L01EVM: Connection problems

Part Number: ADS127L01EVM

First I want to say sorry because I know it is basic questions, but my major is not electronics then I have some trouble.
1) Is it possible to connect 2 analog inputs at the same time? because I saw 2 SMA jacks, or we must use 2 jacks for 1 input?
2) How can I connect it if my input come from photodetector with 1 bnc connector?
Thanks you for your attention!

  • Hello Linh,

    Thanks for your post and welcome to our forum!

    1.) Please check the schematics at the end of the ADS127L01EVM User Guide. The signals applied to the SMA connectors are routed to the input of a fully-differential amplifier. The output is applied to the ADS127L01 input pins and the decimal output code is proportional to the difference between AINP and AINN.

    2.) You'll need to find a BNC-to-SMA adapter. The signal can be applied to J9 and the shield can be connected to J7. Install R72 with 0 ohms to short J7 to GND.


    Best Regards,


    Ryan Andrews

    Precision ΔΣ ADCs

  • In reply to Ryan Andrews:

    Thank you so much Ryan, now I understand a little bit. If I'm in trouble again I will comeback here. Would that bother you and other members?
  • In reply to Linh Nguyen21:

    Not at all! Glad to help.


    Ryan Andrews

    Precision ΔΣ ADCs

  • In reply to Ryan Andrews:

    Hi Ryan,

    1) What does "installing R72" mean? Could I find a resistor and solder it to the module ?

    Thanks you!

  • In reply to Linh Nguyen21:

    Yes - you may install a 0-ohm resistor on the footprint for R72. We sometimes leave extra component footprints on the PCB for customers to modify and experiment with different configurations.

    Best Regards,


    Ryan Andrews

    Precision ΔΣ ADCs

  • In reply to Ryan Andrews:

    Hi Ryan,
    but 0 ohm resistor means just solder it together right?


    Thank you.

  • In reply to Linh Nguyen21:

    Linh - you can also solder across the pads for R72 to short them together. A 0 ohm resistor may be easier to remove later.

    Best Regards,

    Ryan Andrews

    Precision ΔΣ ADCs

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