Measurement-computing USB-2020 Manuel d'utilisateur télécharger pdf (Page 21)

USB-2020 User's Guide Specifications

External trigger

Table 6. External trigger specifications

Parameter Condition Specification

Trigger source

Digital

TRIG IN (BNC connector and 40-pin connector)

Analog

CH0 or CH1

Trigger mode

Digital

Rising or falling edge, high or low level

Analog

Trigger above or below software-selectable level, rising or

falling edge with software-selectable hysteresis

A/D gate source

Digital

TRIG IN (BNC connector and 40-pin connector)

Analog

CH0 or CH1

A/D gate modes

Digital

High or low level

Analog

Software-selectable high or low level, in or out of software-

selectable window

Trigger latency

50 ns max

Trigger pulse width

25 ns min

Input type

49.9 Ω series resistor

Input high voltage

2.0 V min

Input low voltage

0.8 V max

External clock input/output

Table 7. External clock I/O specifications

Parameter Specification

Terminal name

CLK IO (BNC connector)

Terminal type

ADC clock input/output, software-selectable for input or output (default is input)

Terminal description  When configured for input, receives sampling clock from external source



When configured for output, outputs the internal sampling clock

Clock rate

1 kHz to 20 MHz max

Stability

±50 ppm

Input impedance

1 MΩ

Input threshold

High: 2.0 V min

Low: 0.8 V max

Maximum rate

20 MHz

Input range

0 V to 5.5 V

Clock pulse width

25 ns min

Input type

49.9 Ω series resistor

Input high voltage

2.0 V min

Input low voltage

0.8 V max

Output high voltage 2.4 V min

Output low voltage

0.4 V max

Output current

24 mA max

Memory

Table 8. Memory specifications

Parameter Specification

Data FIFO

64 MS using BURSTIO, 4 kS not using BURSTIO

Non-volatile memory

32 KB (30 KB firmware storage, 2 KB calibration/user data)

1 2 ... 16 17 18 19 20 21 22 23 24

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