I'm using an atmega64 and need to output analog values to be measured by another device. I have 2 ports (A & C) completely free, so I have already used 2 x R2R ladders to get 2 analog values.
The problem is i need more than 2 (let's say, about 8 ), so the R2R ladders are not my solution.
I'm thinking of maybe using MCP4921-E/P (Mouser part#) and SPI, but i'd need 8 of these..
What would you recommend using?