External DAC

[andrewback]

I’m guessing you’d need to modify the FPGA gateware. Something similar-ish was done for the larger LimeSDR-USB board — albeit to give SPI access to the LMS7002M from a micrcontroller attached via GPIO.

Control LimeSDR via SPI using Arduino MCU

Well, FPGAs are a different paradigm. In an FPGA you are literally fabricating logic to run bits around your board at the hardware level. This allows, for example, having instantaneous and asynchronous, non-clocked propagation of logic signals (concurrent logic); likewise, you can also build state machines running synchronously on some clock domain you define. FPGAs are the closest thing to the highest speed you can get, other than building a custom application specific IC (ASIC). VHDL (als…

@Zack could likely advise.