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The ADuCM320 is a fully integrated single package device that incorporates high performance analog peripherals together with digital peripherals controlled...
ADuCM320 on Analog.com
whether the aducm320 can source as a 2.5V reference voltage out for other external device?
As specified in the data sheet, yes with a max. current load of 1.2mA.
the pin VIN11/BUF_VREF2V5 ？
Yes, J11 as explained in the data-sheet.