8.4 Correlation between A/D Code and Input Voltage

The two tables below illustrate the correlation between the A/D code and the corresponding input voltage. Use these tables as guides to help think about how to convert between the voltage domain and the A/D code domain.

Bipolar Input Ranges

A/D Code	Input voltage formula	Input voltage ( +5V range)
-32768	-Vfs	-5.0000V
-32767	-Vfs+1LSB	-4.9998V
-1	-1LSB	-0.153mV
0	0V	0.0000V
1	+1LSB	0.153mV
32767	Vfs-1LSB	4.9998V

Unipolar Input Ranges

A/D Code	Input voltage formula	Input voltage ( +5V range)
-32768	-Vfs	0.0000V
-32767	1 LSB (VFS / 65536)	0.153mV
-1	VFS / 2 - 1 LSB	4.9998V
0	VFS / 2	5.0000V
1	VFS / 2 + 1 LSB	5.00015V
32767	Vfs-1LSB	9.9998V