Agilent Technologies 93000 SOC Series - Page 582

Appendix B
582
A major factor is the ADC’s inherent uncertainty.
Even an ideal ADC produces a quantization error which can be
seen as a sawtooth function.
ADC Quantization Error
But other factors also reduce the available resolution:
Calculation of NEFF
1/4
1/2
FS
1/8
3/8
5/8 3/4
7/8
001
010
011
100
101
110
111
000
Ideal ADC
Analog Input
Binary Output Code
+1/2 LSB
–1/2 LSB
Quantization Error
Analog Input