Diamond Systems 16-Channel 12-Bit Analog Output PC/104 Module Analog Output Ranges and Resolution

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 212 = 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.

Copyright 2001 Diamond Systems Corp. Ruby-MM-1612 User Manual V1.1 P. 13