1. Wave Form Sampling
Data sheet says: 20-bit with upper 4-bit as sign extension.
Does the ADC produce 20-bit value as Sign-Magnitude from; where lower 20-bit are always positive and upper 4-bit indicates sign.
The lower 20-bit is negative if the upper 4-bits are all 1s; else lower 20-bit is positive.
or the ADC produces 2's compliment code with upper 4-bit carries negative value of -2x2^20 and lower 20-bit carries positive vlaues
2. What is the full scale of the ADC?