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OM-USB-1208HS Series User's Guide
Specifications
19
External trigger
Table 7. External trigger specifications
Parameter
Specification
Trigger source
TRIG input
Trigger mode
Software-selectable for edge or level sensitive, rising or falling edge, high or low level.
Power on default is edge sensitive, rising edge.
Trigger latency
1 µs + 1 clock cycle max
Trigger pulse width
100 ns min
Input type
Schmitt trigger, 33 Ω series resistor and 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
External clock input/output
Table 8. External clock I/O specifications
Parameter
Specification
Terminal names
OM-USB-1208HS:
AICKI, AICKO
OM-USB-1208HS-2AO:
AICKI, AICKO, AOCKI, AOCKO
OM-USB-1208HS-4AO:
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 D/A clock, if
supported) or pulse generated from AxCKI when in external clock
mode
Input clock rate
1 MHz 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 = –24 mA)
Output low voltage
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
Output current
±24 mA max per terminal (see "Power" section for additional information)
Содержание OM-USB-1208HS Series
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