Datasheet

DRV2667
SLOS751A –MARCH 2013–REVISED JANUARY 2014 www.ti.com
INPUT FILTER CONSIDERATIONS
When using the analog input mode, an input filter may be required depending on the quality of the source signal
provided to the DRV2667 . Some key factors to consider are whether the source is generated from a DAC or
from PWM and the out-of-band content generated. If proper anti-image rejection filtering is used to eliminate
image components, the filter can possibly be eliminated depending on the magnitude of the out-of-band
components. If PWM is used, at least a 1st order RC filter is required. The PWM sample rate should be greater
than 30 kHz to keep the PWM ripple from reaching the piezo element and dissipating unnecessary power. A 2nd
order RC filter may be desirable to further eliminate out-of-band signal content to further drive down power
dissipation and eliminate audible noise.
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