How can I best prevent noise on the SPI lines communicating between my ADC (Burr-Brown 16-bit 8-ch ADS8344) and a 5V microcontroller (AVR ATmega32)?
I've tried to keep the digital lines as far away from the analog lines as possible, and have a 2-layer design with seperate analog / digital ground planes.
Should I buffer all the SPI lines? if so, which buffer chips would be suitable? Do I use series resistors?
I've seen some opto-isolated designs, but we'll be running off of the same power supply for the AD and the microcontroller and they will only be a couple of centimetres apart.