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ADS7250: Operation without VREF

Kei Kuwahara
Expert 6230 points
Part Number: ADS7250

Hello team,

Datasheet says ADS7250 need external VREF of 2.5V.

Is there any way to use this device without external VREF?
I dont need psuedo differential input, single end input is fine for me.

Many of single end input ADC can use AVDD as VREF, and need no external VREF.

Best Regards,
Kei Kuwahara

  • +1
    TI__Guru**** 175511 points

    Kuwahara-san,

    There is no internal reference with the ADS7250, so you need an external source.  For best performance, an external 2.5V reference is needed however you could divide the AVdd by 2 and apply that to the REFINx as well as the AINMx pins.  AINPx could then be a single ended 0-5V signal.