User manual

PIC18F87J72 Evaluation Board User’s Guide
DS51990A-page 34 © 2011 Microchip Technology Inc.
Figure 5-4 shows Graph 1 for CH0 and Graph 2 for CH1. CH0 and CH1 are both
connected to the same signal of 300 mV. The internal PGA gain is chosen to be 1 for
CH0 and 32 for Channel CH1. The waveform on Graph 1 is intact, while the waveform
on Graph 2 is saturated at a value of 32768. This demonstrates the effect of saturation
when larger gains are used. This would distort the wave to a flat top waveform, and the
information related to the shape of the signal would be lost.
FIGURE 5-4: DMCI Waveforms for 300mV Waveform with CH0 Gain = 1, CH1 Gain = 32.