25
Chapter 3
Table 3-3: Jumper JP11 Settings
When you set JPI1 to INT, the D/A converter takes its reference voltage
input from the card's on-board reference. Jumper JP10 selects either -5 V
or -10 V on-board reference voltage. With JP11 set to INT the D/A chan-
nel has an output range of 0 to +5 V or 0 to +10 V, respectively.
When you set JP11 to EXT, the D/A converter takes its reference voltage
input from pin 31 of connector CN3.You can apply any voltage between -
10 V and +10 V to this pin to function as the external reference. The ref-
erence input can be either DC or AC (<100 KHz).
When you use an external reference with voltage Vref you can program
the D/A channel to output from 0 V to -Vref, you can also use the D/A
converter as a programmable attenuator. The attenuation factor between
reference input and analog output is:
Attenuation factor = G / 4095
Where G is a value you write to the D/A registers between 0 and 4095.
For example, if you set G to 2048, then the attenuation factor is 0.5. A
sine wave of 10 V amplitude applied to the reference input will generate a
sine wave of 5 V amplitude on the analog output.
Jumpers
Function Description
JP11
External
Internal (default)
Summary of Contents for PCL-818 Series
Page 1: ...PCL 818 Series 12 bit ISA Multifunction Card User Manual ...
Page 14: ...PCL 818 Series User Manual 6 Figure 1 1 Installation Flow Chart ...
Page 28: ...PCL 818 Series User Manual 20 ...
Page 45: ...2 APPENDIX A Specifications ...
Page 49: ...2 APPENDIX B Block Diagram ...
Page 51: ...2 APPENDIX C Register Structure Format ...
Page 71: ...2 APPENDIX D Calibration ...