Measurement Computing E-1608 - Manual (Page 15)

E-1608 User's Guide Functional Details
15
Analog output
Two 16-bit analog outputs are available at AOUT0 and AOUT1.
Each analog output channel has an output range of ±10 V. Throughput is system-dependent.
The D/A is software-paced. Each 16-bit analog output ( AOUT0 and AOUT1 ) can be updated simultaneously at
rates from 1000 S/s to 5000 S/s. This is the typical throughput when the device and host are both hard-wired to
the same local network. Typical throughput is not guaranteed if a wireless connection is involved or data is sent
over the Internet.
External clock I/O
The E-1608 provides one external clock input ( AICKI ) and one clock output ( AICKO ) for analog inputs.
 You can connect an external clock signal to
AICKI .
 When using the internal clock,
AICKO outputs the ADC scan clock.
Digital I/O
You can connect up to eight digital I/O lines to DIO0 through DIO7 . Each digital channel is individually
configurable for input or output. The digital I/O terminals can detect the state of any TTL-level input and offer .
advanced BiCMOS output.
Refer to the schematic shown in Figure 5.
Figure 5. Schematic showing switch detection by digital channel DIO0
If you set the switch to the +5 V input, DIO0 reads TRUE (1). If you move the switch to GND, DIO0 reads
FALSE (0).
Pull-up/down configuration
Unconnected inputs are pulled high by default to 5 V through 47 kΩ resistors via jumper W3 on the circuit
board (see Figure 6).
1 W3 pull-up/pull-down jumper
Figure 6. W3 jumper location
The pull-up/pull-down voltage is common to all 47 kΩ resistors. Jumper W3 is configured by default for pull-
up.