Microphone preamplifier amplifier Electronics Ic chip TS472IQT , Very low noise

Features

■ Low noise: 10nV/√Hz typ. equivalent input noise @ F = 1kHz

■ Fully differential input/output

■ 2.2V to 5.5V single supply operation

■ Low power consumption @20dB: 1.8mA

■ Fast start up time @ 0dB: 5ms typ.

■ Low distortion: 0.1% typ.

■ 40kHz bandwidth regardless of the gain

■ Active low standby mode function (1μA max)

■ Low noise 2.0V microphone bias output

■ Available in flip-chip lead-free package and in QFN24 4x4mm package

■ ESD protection (2kV)

Description

The TS472 is a differential-input microphone preamplifier optimized for high-performance, PDA and notebook audio systems.

This device features an adjustable gain from 0dB to 40dB with excellent power-supply and common-mode rejection ratios. In addition, the TS472 has a very low-noise microphone bias generator of 2V.

It also includes a complete shutdown function, with active low standby mode.

Applications

■ Video and photo cameras with sound input

■ Sound acquisition & voice recognition

■ Video conference systems

■ Notebook computers and PDAs

Figure 1. Application schematic (flip-chip)

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