Measurement-computing USB-1608FS Instrukcja Użytkownika Pobierz pdf (Strona 21)

USB-1608FS User's Guide

External trigger

Table 6. External trigger specifications

Parameter Condition Specification

Trigger source External digital TRIG_IN

Trigger mode Software-selectable Edge sensitive: user configurable for CMOS compatible

rising or falling edge.

Trigger latency 10 µs max

Trigger pulse width 1µs min

Input type Schmitt trigger, 47 kΩ pull-down to ground

Schmitt trigger hysteresis 1.01 V typ

0.6 V min

1.5 V max

Input high voltage threshold 2.43 V typ

1.9 V min

3.1V max

Input high voltage limit 5.5 V absolute max

Input low voltage threshold 1.42 V typ

1.0 V min

2.0 V max

Input low voltage limit –0.5 V absolute min

0 V recommended min

External clock input/output

Table 7. External clock I/O specifications

Parameter Condition Specification

Pin name SYNC

Pin type Bidirectional

Direction, software-selectable Input Receives A/D pacer clock from external source

Output Outputs internal A/D pacer clock

Input clock rate 50 kHz, maximum

Clock pulse width Input 1µs min

Output 5µs min

Input clock mode Edge sensitive: rising edge

Schmitt trigger hysteresis 1.01 V typ

0.6 V min

1.5 V max

Input high voltage threshold 2.43 V typ

1.9 V min

3.1V max

Input high voltage limit 5.5 V absolute max

Input low voltage threshold 1.42 V typ

1.0 V min

2.0 V max

Input low voltage limit –0.5 V absolute min

0 V recommended min

Output high voltage 4.4 V min (IOH = –50 µA)

3.80 V min (IOH = –8 mA)

Output low voltage 0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 8 mA)

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