MSA180 データシートの表示（PDF） - Oki Electric Industry

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MSA180

Piezo Speaker Amplifier

Oki Electric Industry 

¡ Semiconductor

MSA180

How to Connect the Piezo Speaker

To achieve the full gain level of 10 V, even at a low supply voltage (VCC=3 V), connect a coil in series

with the piezo speaker.

VDD

BASE

MODE2

VCC

SP

AIN MSA180

MODE1

SP

GND

COIL

PIEZO SPEAKER

The resonance frequency that occurs in the circuit containing the coil and the piezo speaker is :

fQ =

1

[Hz]

2p CL ¥ LL

Where CL is the piezo capacitance and LL the coil inductance.

For instance, if the piezo capacitance is 0.1 mF and fQ is in a range of 2 to 3 kHz, then the coil induct-

ance should be 30 mH.

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