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Wolfson rolls stereo codec for smartphones

Posted: 11 Apr 2003 ?? ?Print Version ?Bookmark and Share

Keywords:wolfson microelectronics? wm8750l? stereo codec? audio playback? digital signal processing?

Wolfson Microelectronics Ltd's WM8750L stereo codec is touted to provide all the input interfacing, output drivers, and audio signal processing functions needed to integrate high-quality audio playback, recording, and mixing into a chipscale 5-by-5mm QFN package.

Operating from supply voltages between 1.8V to 3.6V, the codec features a power architecture optimized for handheld and portable digital audio players/recorders, smartphones, and PDAs. The IC allows all major functional blocks of the device to be powered down under software control.

An on-chip DSP performs graphic equalization, including enhanced bass boost, 3D sound enhancement, and automatic level control for the microphone or line input. The built-in DAC delivers 98dB SNR with -95dB THD, while the ADC is capable of providing 95dB SNR and -90dB THD.

The WM8750L is capable of generating 400mW directly to a speaker, as well as individually driving stereo headphone and line outputs. It can automatically detect headphones, further reducing hardware and software overhead. The audio outputs are designed to interface to single ended or differential signal paths.

The codec can operate either as a master or slave with various master clock frequencies including 12MHz or 24MHz for USB devices, or 12.288MHz and 2.458MHz. Various audio sample rates such as 96kHz, 48kHz, and 44.1kHz are generated from the master clock without the need for an external PLL.

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