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Prometheus CPU User Manual V1.44 Page 54
16.4 D/A Conversion Formulas and Tables
The formulas below explain how to convert between D/A codes and output voltages.
D/A Conversion Formulas for Unipolar Output Ranges
Output voltage = (D/A code / 4096) * Reference voltage
D/A code = (Output voltage / Reference voltage) * 4096
Example: Output range in unipolar mode = 0 – 10V
Full-scale range = 10V – 0V = 10V
Desired output voltage = 2.000V
D/A code = 2.000V / 10V * 4096 = 819.2 => 819
Note the output code is always an integer.
For the unipolar output range 0-10V, 1 LSB = 1/4096 * 10V = 2.44mV.
Here is an illustration of the relationship between D/A code and output voltage for a unipolar
output range (V
REF
= Reference voltage):
D/A Code Output voltage symbolic formula Output voltage for 0 – 10V range
0 0V 0.0000V
1 1 LSB (V
REF
/ 4096) 0.0024V
… … …
2047 V
REF
/ 2 - 1 LSB 4.9976V
2048 V
REF
/ 2 5.0000V
2049 V
REF
/ 2 + 1 LSB 5.0024V
… … …
4095 V
REF
- 1 LSB 9.9976V