
7 Analog Modules Synchronization
248 System Reference, January 2001
Synchronization Trigger
The analog module has two pins dedicated for trigger
input. One is the SYNC CLK (Synchronization Clock) pin.
The other is the SYNC DATA (Synchronization Data) pin.
The SYNC DATA pin is for future enhancements.
To provide a path for sending a trigger signal, connect the
SYNC CLK pin to a digital channel that sends a trigger
signal over one wire on the DUT board.
The pulse width of the trigger signal must be greater than
or equal to 8 ns. If the pulse width of the trigger signal is
smaller than 8 ns, the trigger signal may be missed by the
analog module.
The input impedance of the SYNC CLK pin is 50 ohm. The
threshold level of the comparator of the SYNC CLK pin is
fixed to 0.0 V. The analog module activates by the rising
edge of the trigger signal, that is, 0.0 V point of the rising
edge. The recommended level of the trigger signal is ±500
mV (@50 ohm termination). The level of the trigger signal
must be within ±1 V (@50 ohm termination).
Figure 115 Synchronization Trigger
50W
0V(Vth)
+500mV
-500mV
+1V
-1V
Trigger Acknowledge Edge
SYNC CLK Pin
SYNC DATA Pin
50W
Pin Driver
Digital Channel
Comparator
Threshold
Voltage = 0V
Wire
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