ADLINK USB-2401 - Manual (Page 17)

Introduction 7
USB-2401
1.4.4 Digital Input/Output
Thermocouple 107.9735725 143.46202 198.49927 202.17693
2-wire RTD 44.53668125 77.870435 71.369319 127.45831
3-wire RTD 42.00570563 87.738238 72.70806 123.21166
4-wire RTD 72.2785775 155.50389 72.168651 123.65813
2-wire
resistance
72.76746238 153.9091 71.566314 122.28421
I/O Specifications
Number of channels 4-CH programmable function digital input (DI)
2-CH programmable function digital output
(DO)
Compatibility TTL (single-end) (supports 3.3V and 5 V DI but
3.3V DO)
Input voltage Logic low: VIL = 0.8 V max; IIL = 0.2 mA max.
Logic high: VIH = 2.0 V min.; IIH = 0.2 mA max.
Output voltage Logic low: VOL = 0.5 V max; IOL = 10 mA max.
Logic high: VOH = 2.6V min.; IIH = 10 mA max.
Supporting modes (only
one can be selected and
function at the same time,
please see Section 4.6:
Programmable Function
I/O)
X
4-CH TTL DI and 2-CH TTL
DO
X
1-CH 32-bit general-purpose
timer/counters:
Z Clock source: internal or
external
Z
Max source frequency:
internal: 80 MHz; external:
10 MHz
X
1-CH PWM outputs:
Z
Duty cycle:1-99% (please
see Section 4.6.3: Mode 10:
PWM Output) Modulation
frequency: 20 MHz to
0.005Hz
Mode Sampling Rate (SPS)