I'm looking to acquire high speed signals with either the Teensy 3.6 (180MHz) or Teensy 4.0 (600MHz). What would be the minimum signal duration required for adequate analog input? My goal is to collect 20 samples in 1 millisecond or 1 sample every 50 microseconds. I can however likely work with less if needed.

In regards to specifically the Teensy 3.6, how fast can the device write to an SD card? All the acquired data will need to be logged and not be bottlenecked in the controller to maintain fast DAQ capabilities.

Thank you for any and all insight