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VCM-DAS-3 Reference Manual

Analog Output

Analog Output Ranges and Resolution

VCM-DAS-3 provides six different analog output ranges (shown in Table 18), including four

bipolar ranges and two unipolar ranges. One of the bipolar ranges (-2.5 to +7.5V) is

asymmetrical. Power-up ranges are determined by jumper settings (see Power-up Span Range

Configuration). Ranges for individual channels can be set by software using the Set Span

command, available in enhanced mode.

The resolution for any output range 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, the maximum

number of steps is 4096. The actual output codes range from 0 to 4095, which is the full range of

possible 12-bit binary numbers. (See Analog Output Data Representation.)

The table below shows the analog output ranges and resolutions available on the VCM-DAS-3.

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.

Table 18: Analog Output Ranges and Resolution

Full-Scale

Voltage

Bipolar

Unipolar

Range

Name

Negative

Full Scale

Positive

Full Scale

Resolution

(1 LSB)

10V

Bipolar

±10V

10V

+9.9951V

4.88mV

Bipolar

±5V

+4.9963V

2.44mV

2.5V

Bipolar

±2.5V

2.5V

+2.4988V

1.22mV

7.5V

Bipolar

2.5 to +7.5V

2.5V

+7.4963V

2.44mV

10V

Unipolar

0-10V

+9.9976V

2.44mV

Unipolar

0-5V

+4.9988V

1.22mV

SETTING A SPAN RANGE

Power-up span ranges are determined for blocks of channels by jumper settings (see Power-up

Span Range Configuration); however, in enhanced mode, you can set the span range for any

individual channel. To perform a Set Span operation:

1. Write the appropriate Set Span code (see Enhanced Control Register) to the CTRL field

of the ENCTRL register at I/O port 0x30A, combined with the channel number in the

SEL bits of the same register.

2. Perform an LDAC operation by writing Ah to the CTRL field of the ENCTRL register,

combined with the channel number in the SEL field of the same register.

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