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Original question:

ADS1258: Measurement error is too large, Unacceptable

ADS1258EVM-PDK: ADS1258EVM-PDK

Sonia Vargas
Prodigy 95 points
Part Number: ADS1258EVM-PDK
Other Parts Discussed in Thread: ADS1258, OPA365, DIYAMP-EVM

In the user guide of the Evaluation board of the ADS1258 (ADS1258EVM-PDK) page 9, it is indicated :

7.1 Analog Input
The analog input sources can be applied directly to J1 (top or bottom side) or through signal-conditioning
modules available for the the modular EVM system. Signals can be applied directly to J2 for the additional
available channels.

I have searching for signal conditioning EVM modules, and I could not find them.

Could you please indicate the available to buy modules to be inserted as signal conditioning between MUXOUTP-MUXOUTN and ADCINP-ADCINN (such as a board containing OPA365) to be connected in connector J2 of ADS1258EVM?

  • 0
    TI__Mastermind 44720 points

    Hi Sonia,

    I'm aware of one generic signal conditioning PCB that was designed to connect to J1A on all MMBx-based EVMs, but nothing specifically for the ADS1258EVM to act as a buffer between the MUXOUT and ADCIN pins. I think the intent was originally to release a couple of buffer circuits that could plug directly onto the J2 header for this purpose, but I don't think any of these boards were ever released.

    If you want to test an OPA365 buffer circuit with the ADS1258EVM, then by best recommendation at the moment would be to get a hold of some OPA365s and possibly a DIYAMP-EVM or a DIP-ADAPTER-EVM which would allow you to solder an OPA365 to the PCB and either construct the required circuit on the PCB (in the case of the DIYAMP-EVM) or built it on a breadboard. From there you could wire in this circuit between the MUXOUT and ADC inputs. NOTE: Before building a physical circuit, you can always try out a a quick SPICE simulation with the OPA365 SPICE models.

    Please let know if you have any additional questions I can help with!