IBM DAS16AO manual Specifications, Accuracy, Analog input specifications

Chapter 5

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

A/D converter type	AD976A
Resolution	16 bits
Number of channels	16 single-ended / 8 differential, software selectable
Input ranges	±10 V, ±5 V, ±2.5 V, ±1.25 V, software programmable
A/D pacing	ƒ	Internal counter - 82C54
(software programmable)	ƒ	External source - A/D External Pacer, software programmable for rising or
		falling edge
	ƒ	Software polled
A/D trigger sources	External edge trigger (A/D External Trigger)
A/D triggering modes	Rising or falling edge trigger - software selectable
A/D gate sources	A/D External Trigger, gate high or low, software selectable
	A/D Pacer Gate, gate high
Burst mode	Software selectable option, burst rate = 100 kHz
Data transfer	From 4 k sample FIFO via REPINSW
	Programmed I/O
A/D conversion time	5 µs max
Calibrated throughput	200 kHz single channel, 100 kHz multiple channel. Minimum
	system requirement is Pentium II, 400 MHz.
Calibration	Auto-calibration, calibration factors for each range stored on board in nonvolatile
	RAM

Accuracy

Accuracies are listed for a 200 kHz sampling rate, single channel operation, a 60 minute warm-up, and operational temperatures within ±2 °C of internal calibration temperature. The calibrator test source high side is tied to Channel 0 In, and the low side tied to AGND.

Table 2. Absolute Accuracy specifications

Range

±10.00 V

±5.000 V

±2.500 V

±1.250 V

Absolute accuracy

±5.0 LSB max

±5.0 LSB max

±5.0 LSB max

±5.0 LSB max

Each PC-CARD-DAS16/16AO is tested at the factory to assure the board’s overall error does not exceed accuracy limits described in Table 2.

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