ADLINK PCM-6308V+ - Manual (Page 33)

Operation Theory 23
4 Operation Theory
In this chapter, the detail operation theory of the PCI-6308V and
PCI-6308A is described. Before programming or applying the PCI-
6308 card to your application, please go through this chapter to
understand the features first.
4.1 Voltage Output
There are 8 voltage output channels for PCI-6308V and 6308A.
For voltage output operation, you have to understand:
1. How to set the voltage output range.
2. The DA data format.
Voltage Output Range Selection
The DA converter chip of the PCI-6308 is Analog Device
AD7564BRSZ, which has 12-bit resolution. By using OPA2134,
user can set the voltage output polarity by JP1~JP8. Please refer
to section 2.7 for detail of the jumper settings. The selectable
range is +/-10V, 0~+10V and 0V ~ user defined voltage. User-
defined voltage is inputted from the DB-37 connector at pin #6.
DA data format
The DA data format is a 12-bit unsigned value for all channels,
that is, the value is in binary format. The digital value range from
0(0X000) to +4095(0xFFF) corresponds to the full span of the out-
put range, which is set by the jumpers. Table 4.1 shows the rela-
tionship between the digital value and the analog output voltage.
If the application requires a smaller voltage range, the PCI-6308
can still be applied. For example, if the application voltage range
is uni-polar between 0~5V, user need only set jumper to external
reference mode, and supply a 5V source to pin 6 of CN1.