8.2 ANALOG OUTPUT
D/A type
AD7847AR
Resolution
12 bits
Number of channels
2
Output Ranges
±10V, ±5V, 0-5V, 0-10V. Each channel independently programmable.
D/A pacing
Software
Data transfer
Programmed I/O.
Offset error
±600µV max, all ranges (calibrated)
Gain error
±0.02% FSR max (calibrated)
Differential nonlinearity
±1LSB max
Integral nonlinearity
±1LSB max
Monotonicity
12 bits
D/A Gain drift
±2 ppm/°C max
D/A Bipolar offset drift
±5 ppm/°C max
D/A Unipolar offset drift
±5 ppm/°C max
Throughput
PC dependent
Settling time (to .01% of 10V step)
4µs typ
Slew Rate
7V/µS
Current Drive
±5 mA min
Output short-circuit duration
25 mA indefinite
Output Coupling
DC
Amp Output Impedance
0.1 Ohms max
Miscellaneous
Power up and reset, all DAC's cleared to 0 volts, ±200mV
8.3 PARAELLEL DIGITAL INPUT/OUTPUT
Digital Type
82C55A
Configuration
2 banks of 8, 2 banks of 4, programmable by bank as input or output
Number of channels
24 I/O
Output High
3.0 volts @ -2.5mA min
Output Low
0.4volts @ 2.5 mA max
Input High
2.0 volts min, Vcc+0.5 volts absolute max
Input Low
0.8 volts max, GND-0.5 volts absolute min
Power-up / reset state
Input mode (high impedance)
Interrupts
INTA# - mapped to IRQn via PCI BIOS at boot-time
Interrupt enable
Programmable
Interrupt sources
Residual counter, End-of-channel-scan, AD-FIFO-not-empty,
AD-FIFO-half-full
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