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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 ADS7804
Resolution 12 bits
Number of channels 16 single-ended / 8 differential, software selectable
Input ranges ±10 V, ±5 V, ±2.5 V, ±1.25 V, 0 to 10 V, 0 to 5 V, 0 to 2.5 V, 0 to 1.25 V,
software programmable
Internal counter - 82C54.
External source - A/D External Pacer,
software programmable for rising or falling edge
A/D pacing
(software programmable)
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 External Trigger, gate high or low, software selectable A/D gate sources
A/D Pacer Gate, gate high
Burst mode Software selectable option, burst rate = 100 kHz
From 4k sample FIFO via REPINSW Data transfer
Programmed I/O
A/D conversion time 10 µs max
Calibrated throughput 100 kHz
Calibration Auto-calibration, calibration factors for each range stored on
board in nonvolatile RAM
Accuracy
Accuracies are listed for a 100 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 Absolute Accuracy
±10.00 V ±3 LSB max
±5.000 V ±3 LSB max
±2.500 V ±3 LSB max
±1.250 V ±3 LSB max
0 to 10.00 V ±3 LSB max
0 to 5.000 V ±3 LSB max
0 to 2.500 V ±3 LSB max
0 to 1.250 V ±3 LSB max
Each PC-CARD-DAS16/12AO 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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