A DAC is a Digital to Analog converter, so by definition it takes digital, not analog input.
USB, Optical, coaxial and of course HDMI (more for AV) would be the typical digital input connections. There are 'DAC' units that also include an integrated amplifier, and sometimes there is an auxiliary analog input (RCA or XLR) that allows you to bypass the DAC on the device, but this is not an input to the DAC.
I think however, your question is more wondering how to connect an external DAC to your Note 9? If so, USB would be the likely option between the Note and the DAC, then RCA output from the DAC to your amp.