Appendix A: Specifications
4
Note Due to the quad DACs, the current is limited. Only one
output of each may be continuously shorted to ground. The
current is limited to 40 ma for PD2-AO-8[16][32] boards and
20 ma for all other models.
Digital Input and Output
Parameter Value
Number of channels 8 inputs and 8 outputs
Compatibility CMOS/TTL, 2KV ESD protected
Power-on state Logic Zero
Input termination 4.7Kohm pull-up to 5V
Output High Level 3.0V min @ -32 mA, 3.4V min @ -16 mA,
4.2V min @ -2 mA
Output Low Level 0.55V max @ 64 mA
Input Low Voltage 0.0 - 0.8 V
Input High Voltage 2.0 - 5.0 V
Input current 1uA
DSP – based subsystems
There are two DSP-based subsystems available on the PowerDAQ DIO
boards:
• Counter/timers
• High-speed interrupts
DC ELECTRICAL CHARACTERISTICS FOR DSP-
BASED SUBSYSTEMS
Counter/timers
Parameter Value
Number of channels 3
Resolution 24 bits
Maximum frequency 16.5/25MHz for the external,
33/50 MHz for the internal clock (see notes)
Minimum frequency DC for input, 0.001Hz for output
Minimum Pulse Width 20 nS
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