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ADS1278EVM-PDK: -

Ali Husseni
Prodigy 40 points

Part Number: ADS1278EVM-PDK

Hello,

Hope you are doing well. This query is about the motherboard MMB0 rev. D, BOM E. We are interested in the user manual/schematics/BOM of the MMB0 rev. D, BOM E. Much the same info that is currently provided for the ADS1x7xEVM-PDK, but for the motherboard MMB0 rev. D, BOM E. This is helpful for us to see pinouts and voltage references etc. that are made in the MMB0 but affect the ADC too.

Also we would like to know the exact output voltage and the current output to turn ON the MMB0 board.

Just to clarify  the ADS1x7xEVM User's Guide (Rev. A) (ti.com) mentions the following info on the power connection to turn ON the MMB0 board:

  • Output voltage : 5.5VDC to 15VDC
  • Maximum output current : >=500mA

We ordered an AC adapter based on the information specified above and has the following ratings:

  • Output: 9VDC
  • Output Current: 1A

Whereas in the ADCPro Hardware and Software Installation Manual (Rev. A) (Linked in the ADS1x7xEVM User’s Guide) the power connection information is:

  • Must output 6V-7VDC
  • Should have a current rating of at least 2A.

It would be really appreciated if you could you confirm what current and voltage rating is required to power the MMB0 board.

Thanking you in advance.

Regards.

  • +1
    TI__Guru 51610 points

    Hello Aliaqbar,

    Welcome to the TI E2E community.

    The only documentation that we have for the MMB0 board can be found here:

    https://e2e.ti.com/support/data-converters/f/73/p/775258/2868385#2868385

    The AC adapter requirements are a bit confusing.  The steady-state current needed for the AC adapter is 500mA, but during power-up this increases for a short period of time.  Some adapters rated at 500mA will work fine, but others will not.  In order to increase the probability of correct power-up operation, we increased the recommendation for the current rating to 2A.  In most cases, a 1A rated adapter should work well.

    The maximum input voltage that will not damage the MMB0 board is 15V.  However, this voltage is dropped down to 5V, 3.3V, and other voltages using linear regulators.  The board will power-up with a higher input voltage, but eventually the linear regulator will go into thermal shutdown and the board will stop working.  This is why we now recommend a maximum input voltage of 7V.  In your case, the 9V adapter will probably work fine in the lab with a typical room temperature of 23C, but if using in a higher temperature environment, the linear regulator will likely shut down after a few minutes.  

    Regards,
    Keith Nicholas
    Precision ADC Applications