PCI-DAS 4020 analogue DAQ cards from Firetail DAQ provide an ultra high speed analogue input board for PCI bus computers, with four 12-bit analogue inputs with sample rates up to 20 MHz, 24 bits of digital I/O, and two, 12-bit analogue outputs.
A powerful System Timing Controller (STC) chip is central to these analogue DAQ cards, controlling all A/D sampling including a 64K sample A/D FIFO.
This functionality is based on the STC use of an on-board 32K x 24 SRAM.
Desired system timing is maintained by the use of bus-mastering and scatter-gather functionality.
With no switches, jumpers or potentiometers, PCI-DAS 4020 analogue DAQ cards are completely plug and play. All board addresses and interrupt channels are automatically set by the computer, as is calibration by using on-board digital potentiometers and trim D/A converters.
PCI-DAS 4020 analogue DAQ cards feature:
- 12-bit A/D resolution
- Software-selectable Input Ranges
- one A/D Converter per channel
- dual 12-bit D/A converters
- analogue and digital triggering; and
- full auto calibration.
Worst case error occurs only in the unlikely event that each of the component errors are at their maximum level, and are causing error in the same direction.
PCI-DAS 4020 analogue DAQ cards are tested at the factory to ensure an actual worst case error of less than ±5.0 LSB.
Allowing for a 10% guard band, the absolute worst case error of a board ship is ±5.5 LSB.
Typical accuracy can be calculated from the various component typical errors in a similar fashion. This typical, maximum error calculation for the PCI-DAS 4020 analogue DAQ cards yields ±3.4 LSB.
This again assume that each of the errors is forcing an error in the same direction, with empirical evidence supporting a conservative typical error budget of ±3.0 LSB.