> 2) allow different output voltages for two of the four banks of the Silabs > chip > https://osmocom.org/issues/3905
I'd use the DAC for software voltage tuning. Use 0R to select which bank uses which (default rail or programmable one, with just default to have 1/2 bank being the programmable vio). > 3) should we keep the VCTCXO? No. As you explained I think it's better to split functions and not overload this board. > 4) Use SAMD XOSC / PLL / GCLK to allow lower reference frequencies > https://osmocom.org/issues/3857 > Where we'd actually use one of the SAMD GCLK outputs as one of the > intputs to the Si5351C, and expose a GCLK input of the SAMD on an > external header. This way, much lower frequencies can be used to > driver the Si5351C. Or one could even go for deriving them from the > SAMD RTC XTAL. Does that mean the SAMD core would be running from the reference clock ? (and so wouldn't run if there is no reference connected) Cheers, Sylvain
