Athena III User Manual Rev A.03
www.diamondsystems.com
Page
69
16.4
D/A Conversion Formulas and Tables
The formulas below explain how to convert between D/A codes and output voltages.
16.4.1
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:
For,
Output range in unipolar mode = 0
– 10V,
and,
Full-scale range = 10V
– 0V = 10V,
if,
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.
The following table illustrates the relationship between D/A code and output voltage for a unipolar output range
(VREF = 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