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

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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

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Contents
RUBY-MM-1612 Table of Contents Description O Header Pinout Signal Name DefinitionBase Address Configuration Header J5 Position Hex Decimal Board ConfigurationBase Address Adjustable Reference Voltage Analog Output Range ConfigurationOn-Board Reference Full-Scale Voltage Selection Full-Scale VoltageAnalog Output Configuration Header J4 Range RUBY-MM-1612 Board Drawing Ruby-MM-1612 I/O Map Reset informationBase + Write Function Read Function Register Definitions Base + 0 or 1, Read Update DACsBase + 0, Write DAC LSB register Base + 1, Write DAC MSB registerBase + 3, Write External trigger register 82C55 Digital I/O Chip Operation Configuration Register82C55 Register Map DefinitionsFull Scale 1LSB Analog Output Ranges and ResolutionFull Scale 10. D/A Code Computation LSB = 1/2048 x Full-Scale Voltage Offset Binary Coding for bipolar output rangesOutput Code Explanation Output Voltage for ±5V Range Hardware Update Command HOW to Generate AN Analog OutputTo generate an analog output on one or more channels Two channel output Examples Single channel outputCalibration Procedure Miscellaneous SpecificationsOrdering Information FeaturesDescription Pinouts82C55A Pin Description Functional DiagramData Bus Buffer 82C55A Functional DescriptionRead/Write and Control Logic Group a and Group B Controls82C55A Mode SelectionOperational Description Ports A, B, and COperating Modes Single Bit Set/Reset Feature FigureInterrupt Control Functions Inte Flip-Flop DefinitionMode 0 Basic Output Mode 0 Basic InputMode 0 Configurations Control Word #4 Control Word #8 STB Strobe Input Input Control Signal DefinitionIBF Input Buffer Full F/F Intr Interrupt Request Output Control Signal DefinitionBi-Directional Bus I/O Control Signal Definition Mode 2 Strobed Bi-Directional Bus I/OOutput Operations Input OperationsMode Control Word Mode 2 Combinations Current Drive Capability Special Mode Combination ConsiderationsReading Port C Status Figures 15 Applications of the 82C55A