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Calibration
_________________________________________
Figure 4-2. DAC0 Calibration Wiring Diagram.
Figure 4-3. DAC Calibration Values.
_______________________________ _
DIGITAL
OUTPUT
CODE
0 to +5V
FFF hex
+4.9987V
000 hex
0.0000V
1 LSB
1.22mV
1/10LSB
0.122mV
1/10LSB
0.0001V
DAC1 Calibration Procedure.
__________________________
i)
Set up the DAC1 output jumpers for the output range
required, make a note of the output range.
ii)
Using leads as short as possible connect up the digital
voltmeter as in Figure 4-4
iii)
Set DAC1 to its LOWEST output value by writing the
digital code 000 hex to the converter.
iv)
Using Figure 4-3 determine the ideal output voltage for the
000 hex input code, the 1/10 LSB value is the precision
Chapter 4
DAC0 OUTPUT
DAC0 GROUND
ANALOGUE OUTPUT RANGE
UNIPOLAR
0 to +10V +/-2.5V
+9.9976V
0.0000V
2.44mV
0.244mV
0.0002V
Pin 22
Pin 23
BIPOLAR
+/-5V
+2.4987V
+4.9987V
-2.5000V
-5.0000V -10.0000V
1.22mV
2.44mV
0.122mV
0.244mV
0.0001V
0.0002V
AD1200 Reference
DIGITAL VOLT
METER
+ve
+/-10V
+9.9951V
4.88mV
0.488mV
0.0005V
Page 75
-ve
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