AN2240 Datasheet, PDF (1/9 Pages) STMicroelectronics – low noise microphone preamplifier with 2 V bias

AN2240
Application note
Using the demonstration board for the TS472
low noise microphone preamplifier with 2 V bias
Introduction
This application note describes the STEVAL-CCA023V1 demonstration board, specifically
designed to evaluate the TS472 microphone preamplifier.
The document provides information on:
■ the layout of the demonstration board,
■ the board’s components.
About the TS472
The TS472 is an advanced microphone preamplifier solution, especially intended for mobile
multimedia applications, with the following key features.
■ Low noise: 10 nV/√Hz typ. equivalent input noise at F = 1 kHz
■ Fully-differential input/output
■ 2.2 to 5.5 V single supply operation
■ Low power consumption at 20 dB: 1.8 mA
■ Fast start-up time at 0 dB: 5 ms typ.
■ Low distortion: 0.1% typ.
■ 40 kHz bandwidth at -3 dB and adjustable gain
■ Active low standby mode function (1 μA max)
■ Low noise 2.0 V microphone bias output
■ Available in flip-chip lead-free package and QFN24 4 x 4 mm
■ ESD protection (2 kV)
Refer to the TS472 datasheet for complete device information.
August 2009
Doc ID 11677 Rev 4
1/9
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