16.ANALOG OUTPUT RANGES AND RESOLUTION

16.1 Description

Prometheus uses a 4-channel 12-bit D/A converter (DAC) to provide 4 analog outputs. A 12-bit DAC can generate output voltages with the precision of a 12-bit binary number. The maximum value of a 12-bit binary number is 212 - 1, or 4095, so the full range of numerical values that the DACs support is 0 - 4095. The value 0 always corresponds to the lowest voltage in the output range, and the value 4095 always corresponds to the highest voltage minus 1 LSB (the theoretical top end of the range corresponds to an output code of 4096 which is impossible to achieve).

⇒Note: In this manual, the terms analog output, D/A, and DAC are all used interchangeably to mean the same thing.

16.2Resolution

The resolution is the smallest possible change in output voltage. For a 12-bit DAC the resolution is 1/(212), or 1/4096, of the full-scale output range. This smallest change results from an increase or decrease of 1 in the D/A code, and so this change is referred to as 1 LSB, or 1 least significant bit. The value of this LSB is calculated as follows:

1 LSB = Output voltage range / 4096

Example:

Output range = 0-10V;

 

 

Output voltage range = 10V

– 0V = 10V

 

1 LSB = 10V / 4096 = 2.44mV

Example:

Output range = ±10V;

 

 

Output voltage range = 10V

– (-10V) = 20V

 

1 LSB = 20V / 4096 = 4.88mV

16.3 Output Range Selection

Jumper block J13 is used to select the DAC output range. See page 45 for configuration data. The DACs can be configured for 0-10V or ±10V.

Two parameters are configured: unipolar/bipolar mode and power-up/reset clear mode. In most case, for unipolar mode set the board to reset to zero scale, and for bipolar mode configure the board for reset to mid-scale. In each case the DACs will reset to 0V.

Prometheus CPU User Manual V1.44

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Diamond Systems PR-Z32-E-ST, PR-Z32-EA-ST Analog Output Ranges and Resolution, Description, LSB = Output voltage range
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PR-Z32-E-ST, PR-Z32-EA-ST specifications

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