PCI-DAS64/M2/16 User's Guide | Functional Description |
Table 4-1lists the input ranges and resolutions for the available input configurations and gains.
Table 4-1. Analog input range and resolution configurations
| Bipolar | | Unipolar |
| | | | | |
Range | | Resolution | Range | | Resolution |
| | | | | |
±5 V | | 153 ∝V | 0 to 5 V | | 76.3 ∝V |
±2.5 V | | 76.3 ∝V | 0 to 2.5 V | | 38.1 ∝V |
±1.25 V | | 38.1 ∝V | 0 to 1.25 V | | 19.1 ∝V |
±0.625 V | | 19.1 ∝V | | | |
| | | | | |
Burst mode
Channel-to-channel skew is the result of multiplexing the A/D inputs. It is defined as the time between consecutive samples. Burst mode minimizes channel-to-channel skew by clocking the A/D at a high rate between successive samples within a scan, then waiting a specified time before starting a new scan. The PCI- DAS64/M2/16 provides burst mode with a 667 ns minimum sample skew/delay.
Analog output
The PCI-DAS64/M2/16 board provides two high-speed, ±5V 16-bit analog outputs. The outputs are updated via on-board 16 K FIFO buffer and provide a 100 kHz (max) update rate. Repetitive D/A-based waveforms can be stored in on-board memory and generated without requiring ongoing PCI bus transfers. The outputs provide rated accuracy to ±15 mA, are short-circuit-protected (25 mA limit) and are cleared to 0 volts on power-up or reset. The board supports simultaneous full speed operation of both the A/D and D/A.
Digital I/O
The PCI-DAS64/M2/16 provides 32 bits of digital I/O. An 82C55 chip provides 24 bits of CMOS compatible I/O at the board’s 40-pin auxiliary digital connector. Four LSTTL-compatible digital inputs and four outputs are provided on the main 100-pin connector. On power up or reset, all I/O ports default to the input state (high impedance).
Counter/timer I/O
The PCI-DAS64/M2/16 provides one 16-bit down counter (1/3 of an 82C54). Clock, gate and output connections are available at the 100-pin user I/O connector.
