Measurement Specialties PCI-DAS1002 manual Analog output, Absolute accuracy

PCI-DAS1002 User's ManualSpecifications

Analog output

	Table 6. Analog output specifications
D/A converter type	AD7847AR or equivalent
Resolution	12 bits
Number of channels	2
Configuration	Voltage output, single-ended
Output range	±10 V, ±5 V, 0 to 10 V, or 0 to 5 V. Software selectable. Each channel independently
	programmable.
D/A pacing	Software
Data transfer	Programmed I/O
Monotonicity	Guaranteed monotonic over temperature
Overall analog output drift	±0.03 LSB/°C max
Settling time	4 µs to 0.01% of 10 V step
Slew rate	7 V/µs min
Current drive	±5 mA min
Output short-circuit duration	Indefinite @25 mA
Output coupling	DC
Output impedance	0.1 Ohm, max
Miscellaneous	Double buffered output latches
	Output voltage on power up and reset: ±200 mV

Absolute accuracy

Table 7. Absolute accuracy specifications (analog output)

All ranges ±3 LSB

Calibrated accuracy components

Table 8. Calibrated accuracy specifications (analog output)

Gain error	±1.0 LSB max
Offset error	±0.5LSB max
Integral linearity error	±1.0 LSB max
Differential linearity error	±1.0 LSB max

Each PCI-DAS1002 is tested at the factory to assure absolute accuracy.

Total analog output error is a combination of gain, offset, integral linearity and differential linearity error. The theoretical worst-case error of the board may be calculated by summing these component errors. Worst case error is realized only in the unlikely event that each of the component errors are at their maximum level, and causing error in the same direction. Although an examination of the chart and a summation of the maximum theoretical errors shows that the board could theoretically exhibit a ±3.5 LSB error, our testing assures this error is never realized in a board that we ship.

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