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Copyright 2001 Diamond Systems Corp. Ruby-MM-1612 User Manual V1.1 P. 13
9. ANALOG OUTPUT RANGES AND RESOLUTION
The table below lists the available fixed full-scale output ranges and their corresponding actual full-scale
voltage ranges and resolution.
For any output range, the resolution is equal to the maximum possible range of output voltages divided by
the maximum number of possible steps. For a 12-bit D/A converter as is used on the Ruby-MM-1612, the
maximum number of steps is 2
12
= 4096 (the actual output codes range from 0 to 4095, which is the full
range of possible 12-bit binary numbers). Thus the resolution is equal to 1/4096 times the full-scale
range. This is the smallest possible change in the output and corresponds to a change of 1 in the output
code. Because of this fact the resolution is often referred to as the value of 1 LSB, or 1 least significant
bit.
Table 10.1: Analog Output Ranges and Resolution
Full-Scale Unipolar Negative Positive Resolution
Voltage or Bipolar Range Name Full Scale Full Scale (1LSB)
10V Unipolar 0-10V 0V +9.9976V 2.44mV
5V Unipolar 0-5V 0V +4.9988V 1.22mV
2.5V Unipolar 0-2.5V 0V +2.4994V 0.61mV
10V Bipolar ±10V -10V +9.9951V 4.88mV
5V Bipolar ±5V -5V +4.9963V 2.44mV
2.5V Bipolar ±2.5V -2.5V +2.4988V 1.22mV
In the table above, negative full scale refers to the output voltage for a code of 0, and positive full scale
refers to the output voltage for a code of 4095.