D/A Conversion Formulas for Bipolar Output Ranges

Output voltage = ((D/A code – 2048) / 2048) * Output reference

D/A code = (Output voltage / Output reference) * 2048 + 2048

Example: Output range in bipolar mode = ±10V

Full-scale range = 10V – (-10V) = 20V

Desired output voltage = 2.000V

D/A code = 2V / 10V * 2048 + 2048 = 2457.6 => 2458

For the bipolar output range ±10V, 1 LSB = 1/4096 * 20V, or 4.88mV.

Here is an illustration of the relationship between D/A code and output voltage for a bipolar output range (VREF = Reference voltage):

D/A Code

Output voltage symbolic formula

Output voltage for ±10V range

0

-VREF

-10.0000V

1

-VREF+ 1 LSB

-9.9951V

2047

-1 LSB

-0.0049V

2048

0

0.0000V

2049

+1 LSB

0.0049V

4095

VREF - 1 LSB

9.9951V

Prometheus CPU User Manual V1.44

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Diamond Systems PR-Z32-E-ST, PR-Z32-EA-ST user manual Conversion Formulas for Bipolar Output Ranges

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