ADLINK Technology NuDAQ PCI-9812/10, User Manual

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Signal Connection
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The corresponding switches and resistors of other channels are
shown below:
Channel Switches Resistor
Channel 0 C0LO C05V R95
Channel 1 C1LO C15V R96
Channel 2 C2LO C25V R97
Channel 3 C3LO C35V R98
3.2.2 External Clock 0
The external clock 0 (J5) is a sine wave signal which is converted to
a TTL signal inside the PCI-9812/10. This signal is AC coupled.
The input impedance of external clock 0 is 50 ohms and the input
level is 2 volts peak-to -peak.
Please note that the External Clock’s frequency is the system clock.
The maximum A/D clock frequency is half of the system clock.
3.2.3 External Clock 1
The external clock 1 (JP1 pin 1) is a digital clock. The input
impedance is 50 ohms and the input level should be 2.4V ~ 5V into
the 50-ohm load. This signal is DC coupled.
3.2.4 Digital Input
PCI-9812/10 has four digital input : one external digital trigger (JP1
pin3) and three general purpose digital inputs (JP1 pin5, 7, and 9).
These inputs are TTL compatible with 10K-ohm pull-down resistors.