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A/D converters enable high-performance recording in portable consumer apps

Edinburgh, UK — Wolfson Microelectronics plc has extended its A/D converter offering with two new devices with record functionality that are aimed at consumer electronics.

The WM8950 and WM8951 offer highly integrated microphone support solutions characterized by low-power consumption, compact size and audio performance with a signal-to-noise ratio (SNR) of 90 dB at 3.3 V. Applications include digital still and video cameras, game console accessories and wireless microphones.

The WM8950 mono A/D converter supports both differential and single-ended microphones and has microphone pre-amplifiers to reduce external part count. Key features include advanced sigma-delta converters, which are used alongside digital decimation filters, to give high quality audio at sample rates from 8 kHz to 48 kHz. Additional filtering options include a programmable high-pass filter, for wind noise and other extraneous noise reduction, a programmable infinite impulse response (IIR) filter and an advanced programmable automatic level control (ALC) with noise gate in the A/D converter path.

The WM8950 also supports A-law and μ-law compounding for reduced data rates over a wireless link and an integrated PLL allows support for a wider range of clocking rates. The device is offered in a 4mm x 4mm QFN package, and it can be powered from a 3-V supply.

The WM8951 is a high-performance stereo A/D converter, which can operate at digital voltages down to 1.42 V and analog voltages of 1.8 V. Packaged in a 5mm x 5mm QFN, the WM8591 achieves a SNR of 90 dB at 3.3 V, 85 dB at 1.8 V, and supports sampling rates of 8 kHz to 96 kHz. It also features a selectable A/D converter high-pass filter, a serial audio interface and 2/3 wire control interface for software access to all features including volume controls, mute and power management.

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The WM8950 and the WM8951 are available now and are priced at $1.27 and $1.12 respectively in 10,000-piece quantities. Click here for the WM8950 data sheet. Click here for the WM8951 data sheet.

Wolfson Microelectronics , 1-858-676-5090, www.Wolfsonmicro.com.

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