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Wolfson Microelectronics has launched a range of low-power CODECs designed to enhance the audio performance and extend the battery life of portable applications.

The WM8944, WM8945, WM8946 and WM8948 are targeted at portable applications including digital still cameras, digital camcorders and voice recorders.

The WM8944 and WM8945 are mono low-power CODECs, with a touch-panel controller included in the WM8945, while the WM8946 and WM8948 are stereo low-power CODECs, with the WM8948 featuring a touch-panel controller.

Features include Wolfson’s ReTune filter, which enables customers to improve the frequency characteristics of the device housing, microphone and speaker, and provides enhanced record and playback performance, without requiring hardware modifications.

The devices also provide a high level of feature integration including speaker, video and microphone amplifiers, and an LDO regulator, which simplify system design, increase noise immunity, lower BOM cost, and minimise the total footprint of the audio solution.

A range of audio enhancement features are also included to improve the sound quality during recording in portable devices, including Dynamic Range Control, a stereo-widening algorithm, five notch filters, five-band programmable equaliser and programmable wind-noise filter.

The products also include a digital microphone interface, enabling the transition to MEMS-based microphones with high noise immunity.

Software compatibility across the product range enables system designers to adopt a platform development approach for multiple models.

For example, in digital still camera applications, the WM8944, WM8945, WM8946 and WM8948 enable system designers to simultaneously develop the audio solution for mono and stereo models, with and without touch-panel control.

The WM8944, WM8945, WM8946 and WM8948 are available for sampling in a 36-ball W-CSP package.

WM8944, WM8945, WM8946 and WM8948 customer evaluation boards with the Wolfson Interactive Setup and Configuration Environment (WISCE) are available to aid device evaluation and development.

WISCE connects to the evaluation board over USB and offers an interactive register map interface.

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