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Audio codecs interface directly to digital, analog mics

Posted: 13 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:audio codecs? noise filtering? digital mics? A/D conversion?


Texas Instruments Inc. has introduced three audio codecs featuring low power consumption and noise filtering capabilities to maximize battery life and enhance performance in portable consumer applications including wireless handsets, personal navigation devices, digital still cameras and portable media players. The devices are the industry's first I2S codecs capable of interfacing directly to digital or analog microphones.

The four-channel TLV320AIC34, TLV320AIC33 and TLV320AIC3106 stereo codecs can accept either a digital bit stream from a digital microphone or differential or single-ended inputs from a traditional analog microphone. The new codecs, in conjunction with digital microphones such as those offered by Akustica, provide designers with a premium quality audio solution.

"Electromagnetic and RF interference can compromise audio quality on portable devices and cellular phones, resulting in 'static-noise' and 'drop-outs' in voice conversations," said Davin Yuknis, VP of marketing and product management at Akustica. "The combination of TI's advanced, high-performance codecs and Akustica's robust, digital microphones ensures that the audio quality is crystal clear throughout the acoustic signal chain."

In addition to direct interface to digital microphones, the new codecs include support for 8-96KSps sampling rate, high SNR of 102dB for D/A conversion and 92dB for A/D conversion, and integrated PLLs supporting a wide range of audio clocks. Additional features include low-power headphone, speaker and playback modes for portable systems and programmable digital audio effects including 3D sound, bass, treble, EQ and de-emphasis.

The TLV320AIC33 and TLV320AIC3106 are available today and the TLV320AIC34 is sampling now. The TLV320AIC34 is available in a 6mm x 6 mm BGA package and the TLV320AIC33 and TLV320AIC3106 are available in a 5 mm x 5 mm BGA and 7mm x 7mm QFN package. Suggested resale pricing in quantities of 1,000 is $6 for the TLV320AIC34, $3.95 for the TLV320AIC33 and $3.85 for the TLV320AIC3106.

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