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Low-noise low-power microphone amplifiers

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MAXIM Integrated Products, represented by Arrow Electronics , has introduced the MAX9812/MAX9813 low-noise, low-power microphone amplifiers with integrated bias.

The MAX9812 is a single amplifier packaged in a tiny 6-pin SC70 (2mm x 2.1mm) and the MAX9813 is a dual-input amplifier packaged in a small 8-pin SOT23 (3mm x 3mm) that allows two microphones to be multiplexed to a single output.

The MAX9812/MAX9813 feature a 500kHz bandwidth, Rail-to-Rail* outputs, a 100dB power-supply rejection ratio, and a very low 0.015% THD + N.

Power-saving features include very low 230 microamps supply current, and a total shutdown mode that cuts the combined supply and mic-bias currents to only 100nA.

The MAX9812/MAX9813 have a 20dB fixed-gain configuration that eliminates the need for external gain-setting components. These devices are available in two grades.

The MAX9812L/MAX9813L operate from 2.7V to 3.6V and are optimised for PDA and cell phone applications. The MAX9812H/MAX9813H operate from 4.5V to 5.5V, are PC2001 compliant, and are optimised for notebook and PC applications.

The MAX9812/MAX9813 are specified over the extended operating temperature range (-40°C to +85°C).

*Rail-to-Rail is a registered trademark of Nippon Motorola.

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