Driving Audio Piezoelectric Transducers

Abstract: This audio application note identifies and describes the key elements in designing a driver for a piezoelectric transducer (PZT). The relationship between source impedance and sound pressure level is measured, single-ended (S/E) and bridge-tied load (BTL) driving schemes are compared and the input impedance of a PZT is characterized.
Maxim > App Notes > Amplifier and Comparator Circuits Audio Circuits
Keywords: audio driver, BTL, bridge tied load, PZT, piezoelectric, audio transducer Mar 26, 2002

APPLICATION NOTE 988
Driving Audio Piezoelectric Transducers


Abstract:This audio application note identifies and describes the key elements in designing a driver for a piezoelectric transducer
(PZT). The relationship between source impedance and sound pressure level is measured, single-ended (S/E) and bridge-tied
load (BTL) driving schemes are compared and the input impedance of a PZT is characterized.

Audible piezoelectric transducers (PZTs) are often used as warning devices or alarms. Manufacturers of piezo transducers publish
curves and specifications concerning their respective devi