Measurement Specialties PC-CARD-DAS16/12AO manual Analog output section

PC-CARD-DAS16/12AO User's GuideSpecifications

Analog output section

		Table 6. Analog output specifications
D/A converter type	LTC1446
Resolution	12 bits
Number of channels	2
Configuration	Voltage output, single-ended
Output Range	±10 V, ±5 V. Software selectable. Selected range applies to both channels.
D/A pacing	Software
Data transfer	Programmed I/O
Throughput	System dependent. Using the Universal Library programmed output function (cbAout) in a
	loop in Visual Basic, a typical update rate of 5.5 kHz (±200 Hz) can be expected. The rate was
	measured on a 600MHz Pentium III based PC.
Accuracy
			Table 7. Accuracy specifications
Absolute accuracy			±5.0 LSB worst case error
Differential linearity error			±0.5 LSB max
		Table 8. Calibrated accuracy components
Gain error			±1.0 LSB max
Offset error			±1.0 LSB max
Integral linearity error			±5.0 LSB max

Each PC-CARD-DAS16/12AO is tested at the factory to assure the board’s overall error does not exceed ±5.0 LSB.

Total board 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 ±7.5 LSB error, our testing assures this error is never realized in a board that we ship.

Monotonicity	Guaranteed monotonic over temperature
Analog output full-scale gain drift	±0.60 LSB/°C max
Analog output zero drift	±0.07 LSB/°C max
Overall analog output drift	±0.67 LSB/°C max
Slew rate	± 0.5 V/µs min
Current drive	±2 mA min
Output short-circuit duration	Indefinite @ 12 mA
Output coupling	DC
Output impedance	0.1 ohms max
Miscellaneous	Double buffered output latches
	Coding: Inverted Offset Binary:
	0 code = +FS, 4095 code = -FS
	Output voltage on power up and reset: +10 V (+FS)

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