User`s manual

User’s Manual 33
4.4.1 A/D Converter Calibration
All single-ended inputs are factory-calibrated with actual voltages at a gain code of 0.
Typical values for the other gain codes and for other calibration constants for current and
differential measurements are used to populate the table to allow A/D conversions to be
done “out of the box.” See Appendix B.4.3.3 for information on performing your own cal-
ibrations in situations where you require enhanced accuracy.
4.4.2 A/D Converter Power Supply
The analog section is isolated from digital noise generated by other components by way of a
low-pass filter composed of L1, C10, and C15 on the RCM3400 as shown in Figure 11. The
+V analog power supply powers the A/D converter chip.
Figure 11. Analog Supply Circuit
+V
Vcc
C15
2.2 nF
C10
100 nF
L1