What are some commonly used (tested with AVR's) high speed ADC IC's that you guys have used in your project?
I was looking for something along the following lines:
1. 16 bit
2. Max sampling frequency: >=2 MSPS @ 16 bit
3. Able to handle positive and negative voltages
4. SPI interface.
5. 5V/3.3V operation.
6. Differential inputs (not needed but would be better)
Xmega is not an option.
I checked the analog website and found the AD7298 which looks good but is 12 bit.
Side question: Why is 12 bit so popular? Is it the ease of design?