Hi All,
First time using a DAC, so feel free to set me straight if I am going about this all the wrong way.
I'm wanting to use a 12-bit DAC (MCP4725) to put out 5-50mV on the non-inverting input of an op amp (it's very low offset, so I think I'm ok in that regard). I'm currently using a precision 5v reference (REF02).
I can see two options to get full resolution out of the DAC:
1) Use a 100 to 1 voltage divider (eg. 99k and 1k). Is this reasonable or is there an upper limit to how high a voltage divider ratio can be?
2) Use the full 0-5V from the DAC and multiply the inverting input by 100 using a precision op amp.
Is there a preferred way to deal with this or am I way off track? Any advice much appreciated.
Steve