Startscan Signal; Ssh Signal - Measurement Computing PCI-DAS6030 User Manual

PCI-DAS6030 & PCI-DAS6032 User's Guide
Rising Edge Polarity
Falling Edge Polarity

STARTSCAN signal

The STARTSCAN output signal indicates when a scan of channels has been initiated. You can program this
signal to be available at any of the AUXOUT pins. The STARTSCAN output signal is a 50 ns wide pulse the
leading edge of which indicates the start of a channel scan. Figure 12 shows the timing for the STARTSCAN
signal.

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. Figure 13 shows the timing for the SSH signal.
Start Pulse
CONVERT
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t = 37.5 ns minimum
w
Figure 10. A/D STOP TRIGGER input signal timing
t
t = 50 ns
w
Figure 11. A/D STOP TRIGGER output signal timing
t
t = 50 ns
w
Figure 12. STARTSCAN start of scan timing
SSH
t = 10 ns minimum
off
Figure 13. SSH signal timing
20
t
w
w
w
t
off
Functional Details