ADLINK cPCI-6208V - Manual (Page 30)

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Operation Theory
4.2 Current Output
The precision voltage-to-current converter XTR110 implements the current
output. The current output channel n (An) is control by the voltage of
channel n (Vn). The block diagram of the current output channels is shown
in Fig 5.
Figure 8: Current Output Circuits
The cPCI/PCI-6208A provides an on board +15V power supply. Each
current output channel is a current source, which is controlled by the
voltage of the corresponding channel. For example, voltage output
channel 3 control the current source of channel 3. The output current
range is programmable. All 8 current channels on the cPCI/PCI-6208A are
controlled by one control register. The control voltage range is always uni-
polar 0~10V. There are three kinds of output current ranges. Refer to the
following table and Section 5.2.8 for programming information.
Mode
Input Voltage
Range
Output Current
Range
1 0~10V 0~20 mA
2 0~10V 4~20 mA
3 0~10V 5~25 mA
Table 3. Current Output and Range Control
Caution: The Current Output Module accepts only POSITIVE control
voltage; applying negative voltage may permanently damage the
module or your device.