Input Sequencer; Frequency/Pulse Generators - Measurement Computing PCI-2513 User Manual

PCI-2513 User's Guide

Input sequencer

Analog, digital, and counter inputs can be scanned based on either an internal programmable timer or an
external clock source.
Scan clock sources: two
Programmable parameters per scan
Depth
Onboard channel-to-channel scan rate
External input scan clock (XAPCR)
maximum rate
Clock signal range
Minimum pulse width
The maximum scan clock rate is the inverse of the minimum scan period. The minimum scan period
Note 3:
is equal to 1 µs times the number of analog channels. If a scan contains only digital channels then
the minimum scan period is 83 ns times the number of digital channels.

Frequency/pulse generators

Channels
Output waveform
Output rate
High-level output voltage
Low-level output voltage
Table 5. Input sequencer specifications
(Note 3) Internal:
 Analog channels from 1 µs to 1 sec in 20.83 ns steps
 Digital channels and counters from 83.33 ns to 1 sec in 20.83 ns steps
External. TTL-level input (XAPCR):
 Analog channels down to 1 µs minimum
 Digital channels and counters down to 83 ns minimum
 Programmable channels (random order)
 Programmable gain
512 locations
 Analog: 1 MHz maximum
 Digital: 12 MHz if no analog channels are enabled, 1 MHz with analog
channels enabled
 Analog: 1MHz
 Digital: 12 MHz if no analog channels are enabled, 1 MHz with analog
channels enabled
 Logical zero: 0 V to 0.8 V
 Logical one: 2.4 V to 5.0 V
50 ns high, 50 ns low
Table 6. Frequency/pulse generator specifications
2 x 16-bit
Square wave
1 MHz base rate divided by 1 to 65535 (programmable)
2.0 V minimum @ –1.0 mA, 2.9 V minimum @ –400 µA
0.4 V maximum @ 400 µA
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Specifications