Measurement Computing PCI-DAS6013 - Manual (Page 22)

PCI-DAS6013 and PCI-DAS6014 User's Guide Functional Details
22
Rising Edge Polarity
t
w
t
w
= 37.5 ns minimum
Falling Edge Polarity
Figure 9. A/D STOP TRIGGER input signal timing
t
w
t
w
= 50 ns
Figure 10. A/D STOP TRIGGER output signal timing
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.
t
w
t
w
= 50 ns
Figure 11. STARTSCAN start of scan timing
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 12 shows the timing for the SSH signal.
Start Pulse
t
off
= 10 ns minimum
CONVERT
SSH
t
off
Figure 12. SSH signal timing