ADLINK Technology PCIe-9842, Руководство пользователя

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4 Introduction
1.3.3 Triggers
Specifications Value
Trigger Source
Software trigger
External digital trigger
Trigger Mode
Post-Trigger, delay-trigger
Re-trigger for all trigger modes
External Digital Trigger Input
Compatibility 3.3 V TTL, 5 V tolerant
Input High Threshold (V
IH
)
2.0 V
Input Low Threshold (V
IL
)
0.8 V
Maximum Input Overload -0.5 V to+5.5 V
Input Impedance 50 Ω
Trigger Condition
Rising edge or Falling edge,
software programmable
Minimum Pulse Width 20 ns
Digital Trigger Output
Compatibility 5 V TTL
Output High Threshold (VOH) 2.4 V
Output Low Threshold (VOL) 0.2 V
Trigger Output Polarity
Positive or Negative
Software programmable
Trigger Output Pulse Width
(50ns, 100ns, 150ns, 200ns,
500ns, 1us, 2us, 7.5us and
10us) ± 10ns, software select-
able
Trigger Output driving Capacity
Capable of driving a 50 ohm
load
Table 1-3: Triggers