Measurement-computing USB-1608GX-2AO Manuel d'utilisateur télécharger pdf (Page 20)

USB-1608GX-2AO User's Guide Specifications

External clock input/output

Table 12. External clock I/O specifications

Parameter

Specification

Terminal names

AICKI, AICKO

AOCKI, AOCKO

Terminal types

AxCKI: Input, active on rising edge

AxCKO: Output, power on default is 0 V, active on rising edge

Terminal descriptions

AxCKI: Receives sampling clock from external source

AxCKO: Outputs the internal D/A or A/D sampling clock, or the pulse generated from

AxCKI when in external clock mode.

Input clock rate

500 kHz max

Clock pulse width

AxCKI: 400 ns min

AxCKO: 400 ns min

Input type

Schmitt trigger, 33 Ω series resistor, 47 kΩ pull-down to ground

Schmitt trigger hysteresis

0.4 V to 1.2 V

Input high voltage

2.2 V min

5.5 V absolute max

Input low voltage

1.5 V max

–0.5 V absolute min

0 V recommended min

Output high voltage

4.4 V min (IOH = –50 µA)

3.76 V min (IOH = –2.5 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 2.5 mA)

Output current

±2.5 mA max

Counter

Table 13. Counter specifications

Parameter

Specification

Terminal names

CTR0, CTR1

Number of channels

2 channels

Resolution

32-bit

Counter type

Event counter

Input type

Schmitt trigger, 33 Ω series resistor, 47 kΩ pull-down to ground

Input source

CTR0 (pin 52)

CTR1 (pin 51)

Counter read/writes rates

(software paced)

33 to 8000 reads/writes per second typ, system dependent

Input high voltage

2.2 V min, 5.5 V max

Input low voltage

1.5 V max, –0.5 V min

Schmitt trigger hysteresis

0.4 V min, 1.2 V max

Input frequency

20 MHz, max

High pulse width

25 ns, min

Low pulse width

25 ns, min

1 2 ... 15 16 17 18 19 20 21 22 23 24 25

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