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AD1200 Reference
required. This is the OFFSET adjustment.
For BIPOLAR ranges adjust trim pot 8 for minus full scale
value. eg for range -5 to +5 bipolar the ideal offset voltage
is -5.0000 Volts +/- 0.0002 Volt.
For UNIPOLAR ranges adjust trim pot 9 for zero volts.
eg for range 0 to +5 unipolar the ideal offset voltage is
0.0000 Volts +/- 0.0001 Volt.
v)
Set DAC1 to its HIGHEST output value by writing the
digital code FFF hex to the converter.
vi)
Using Figure 4-3 determine the ideal output voltage for the
FFF hex input code, the 1/10 LSB value is the precision
required. This is the GAIN adjustment.
Adjust trim pot 7 for maximum positive output voltage.
eg for range -5 to +5 bipolar the ideal full scale voltage is
+4.9987 Volts +/- 0.0002 Volt.
eg for range 0 to +5 unipolar the ideal full scale voltage is
+4.9987 Volts +/- 0.0001 Volt.
Figure 4-4. DAC1 Calibration Wiring Diagram.
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DAC1 OUTPUT
DAC1 GROUND
Pin 24
Pin 25
Calibration
DIGITAL VOLT
METER
+ve
-ve
Chapter 4
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