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Powering ADS1298ECGFEPDK withoiut MMB0 board

Noel Teku
Intellectual 430 points
Other Parts Discussed in Thread: ADS1298

Hello,

I am currently trying to interface a PIC microcontroller with the ADS1298ECGFEPDK board, without the MMB0 evaluation board. I have ran into an issue regarding how to power the ADS1298ECGFEPDK board without the MMB0 board. I was planning on accessing pin 10 of J4 and connecting it to 5V from the PIC's development board. However, I am concerned about whether or not this would be sufficient given this passage from the ADS1298ECGFEPDK datasheet,

"The ADS1298 can operate in a single supply with +3.0V to +5.0V analog supply (AVDD/AVSS) or bipolar mode supply (±1.5V to ±2.5V). An additional digital supply of and +1.8V to +3.0V digital supply (DVDD) is required for operation." (pg.41)

I don't understand all of this passage and I am concerned as to whether or not I'm giving the board enough power. Any thoughts?

Thanks,

Noel Teku

  • 0
    TI__Mastermind 38745 points
    Hey Noel,

    You will also need to supply either 3.3 V or 1.8 V digital supply to pin 2 of JP24 and you will need to tie your ground to the EVM board's ground. If you look at the schematic you can look at how you could connect the digital supply through J4 and use a jumper on JP24 to chose which supply to use. The schematic also shows how AVDD and AVSS get generated from the 5 V you supply at pin 10 of J4.

    Regards,
    Brian Pisani
  • 0 in reply to Brian Pisani
    Intellectual 430 points

    Hi Brian,

    Thank you for the reply. I have also been thinking of still using the MMB0 board, but using a ribbon cable to connect the MMB0 board to J4 of the ADS1298ECGFEPDK, without having the SPI lines of the ADS1298ecgfepdk connect to the connector on the MMB0. Instead these lines would connect to the PIC. Any thoughts?

    Thanks again,

    Noel Teku

  • 0 in reply to Noel Teku
    TI__Mastermind 38745 points
    As long as you have a setup where the ADS1298 is properly powered, I don't see an issue. Remember to also tie all of the digital grounds together so your interface voltages are on the same common-mode.