Measurement-computing USB-1608GX-2AO-OEM Manual de usuario descargar pdf (Pagina 21)

USB-1608GX-2AO-OEM 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 sampling clock (D/A or A/D 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 ... 16 17 18 19 20 21 22 23 24 25 26

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