Filtering and Adapting PWM Waveforms
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SLOU403C – March 2015 – Revised June 2018
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DRV2700EVM High Voltage Piezo Driver Evaluation Kit
8.2.3
Remove Filter for Analog Input
If the input signal is an analog waveform, as opposed to a PWM, then an input filter may not be
necessary. Before removing the filter, ensure that a simple RC filter is not needed to remove any artifacts
from the digital-to-analog converter (DAC) output or other input source. Follow these instructions to
remove the input filter completely.
1. Replace resistors R6, R7, R13, and R14 with 0-
Ω
resistors
2. Remove resistors R17 and R18
3. Remove capacitors C8, C9, C13, and C14. Do not remove ac coupling capacitors C4 and C5.
See
Figure 13
for a diagram of the input configuration.
