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TMDS243EVM: Interfacing TI Sitara with ADC

Claus Hohensinn
Prodigy 20 points
Part Number: TMDS243EVM
Other Parts Discussed in Thread: ADS9813, ADS8568, ADC-PHI-PRU-EVM, ADS8568EVM-PDK, ADS8588H

Tool/software:

Hello Team,

we are planning to use TIs Sitara and ADS8568 (later on ADS9813) in a new sensor design. Its crucial for us that we don't use FPGAs, so we stumbled across the possibility to connect precision ADCs directly to an AM64x processor eliminating the need for an FPGA (https://www.ti.com/video/6310289219112). Our question therefore is if we can test this possibility beforehand with the ADC we plan to use? 

We were thinking of something like:

ADS8568EVM-PDK - ADC-PHI-PRU-EVM - TMDS243GPEVM

Would this be easily possible as described in the above mentioned video (as the ADS8568 evalkit is not explicitly mentioned)?

BR, Claus

  • 0
    TI__Mastermind 39131 points

    Hello Claus,

    I am looking at your queries, and you may expect a reply in one or two days.

    Regards,

    Anil.

  • 0 in reply to Swargam Anil
    TI__Expert 6665 points

    Hi Claus,

    An example for interfacing a 16-bit 8-channel ADC ADS8588H with AM243x is currently available in MCU+ SDK - https://software-dl.ti.com/mcu-plus-sdk/esd/AM64X/09_02_00_50/exports/docs/api_guide_am64x/EXAMPLES_PRU_ADC_ADS85x8.html

    I will have to check if your ADC is compatible with this or not, allow me some time to look into this and get back to you

    Regards,

    Nitika

  • 0 in reply to Nitika Verma
    Prodigy 20 points

    Hi Nikita,

    Thanks for the reply, any information on this would be very much apreciated! 

    If a bit more information would be of interest:

    our Sensor design requires an ADC that is simultaneously sampling signals with a maximum bandwidth of 200kHz, so we decided to go with ADS8568 as the the ADS8588/89 "only" support up to 24kHz. Furthermore we have to avoid FPGAs, so sitara platform would be of great interest. The 16 bits resolution could be reduces to 14bits but as the eval kit (ADS8568EVM-PDK) has a 16bit ADC mounted, we could test our analog design with that in parallel mode as well...

    If there would be any suggestion for a higher samplng rate, (really) simultaneous sampling 14bit ADC with specified bandwidth, that is supported by the sitara platform and the above mentioned Eval kits, please let me know. Any help on this would be greatly appreciated!

    Regards,

      Claus

  • 0 in reply to Claus Hohensinn
    TI__Expert 6665 points

    Hi Claus,

    I checked internally, ADS8588H interfacing with AM243x example available in MCU+ SDK can be used directly for ADS8568 as well.

    In the code, currently the firmware is configured to generate sampling clock of 40KHZ using IEP sync1. To operate at maximum sampling frequency(500KSPS) you can change ADC_CONVST_IEP_PRD_CONST to 2000 - 2 (in code below).

    Additionally, we have a GUI tool that you can use for evaluation purpose - dev.ti.com/.../

    Regards,

    Nitika