I'm trying to make SPI connection between LTC6804-1 and Raspberry Pi3 Model B; I'm new to SPI and I encountered with a couple of questions:
1- If I want to make SPI connection through MATLAB, then the speeds that I can set for SPI, start from 500kHz. Is this ok for continuous reading of voltage measurements?
2- In addition to 4 wire connections (SCLK, MISO, MOSI, CS) should I connect grounds of two boards together?
3- I need to use 3.3 volt signals on my RPi3 and because SPI voltages on LTC6804-1 are 5 volts, then I'm going to use resistive divider; is there any special point that I must take into consideration?