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PCI-DAS6013 and PCI-DAS6014 User's Guide
SSH signal
The SSH signal can be used as a control signal for external sample/hold circuits. The
SSH signal is a programmable polarity pulse that is asserted throughout a channel scan.
The state of this signal changes after the start of the last conversion in the scan. The SSH
signal may be routed via software selection to any of the AUXOUT pins.
shows the timing for the SSH signal.
Start Pulse
CONVERT
A/D CONVERT signal
The A/D CONVERT signal indicates the start of an A/D conversion. It is available
through software selection as an input to any of the AUXIN pins (defaulting to
AUXIN0) and as an output to any of the AUXOUT pins.
When used as an input, the polarity is software selectable. The A/D CONVERT signal
starts an acquisition on the selected edge. The convert pulses must be separated by a
minimum of 5 µs to remain within the 200 kS/s conversion rate specification.
Refer back to
CONVERT to the DAQ sequence.
output pulse width requirements for the A/D CONVERT signal.
Rising Edge Polarity
Falling Edge Polarity
Figure 4-11. A/D CONVERT Signal Input Timing Requirement
SSH
t
off
Figure 4-10. SSH Signal Timing
Figure 4-3
on pg. 4-5 and
Figure 4-11
= 10 ns minimum
Figure 4-6
on pg. 4-6 for the relationship of A/D
and
Figure 4-12
t
w
t
= 37.5 ns minimum
w
4-8
Functional Details
Figure 4-10
t
off
show the input and
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