Post Go back to editing

Reference voltage AD7329 Eval Board

Category: Hardware

Hey folks,

I am currently working on a small project that involves using the AD7329 ADC. For development purposes, I have been provided with an evaluation board, but I have encountered some challenges that I hope you can assist me with. The evaluation board is connected to a Raspberry Pi Pico (RP2040) via SPI. I am able to receive data, but the values obtained are not quite plausible. I have used the AD7329's internal reference voltage, but I haven't been able to verify if the evaluation board has a 680nF capacitor connected to the REFin/REFout pin. Additionally, the evaluation board's guide mentions an onboard AD780, but it does not provide any further explanation on how to utilize it. Could you please assist me by answering my questions regarding the presence of a 680nF capacitor on the board and providing guidance on using the onboard AD780?

  • GPCecchetti,

    The evaluation board page should normally have the information you are looking for but I noticed there is an issue with the schematic content that I've notified the product owner of.  I am going to ask the product owner to update this thread when the issue has been resolved and to attempt to answer you in the interim.

    Sean

  • Hi GPCecchetti,

    The evaluation board mounts a 470nF C50 and if necessary, you can increase the capacitance by mounting C76 which is in parallel.

    The board also contains AD780 connected to REFIN/REFOUT but it is necessary to configure properly LINK-2 since it is possible to use the AD780 or an external signal as a reference. If you want to use the AD780 as a reference, you will need to configure the REF bin in the control register accordingly. The voltage value of AD780 can be 2.5 or 3V depending on LK29.

    Attached you will find the schematic of the EVAL.

    PDF

    Regards

    Joan

Before You Switch


Switching languages will make ADI Explorer unavailable. Resume your session by switching back to English and reopening ADI Explorer.