Audio codecs with digital microphone support for portable consumer devices

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

The four-channel TLV320AIC34, and 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 codecs, in conjunction with digital microphones such as those offered by Akustica, provide designers with a premium quality audio solution.

In addition to direct interface to digital microphones, the codecs include the following key benefits:

· Support for 8-96 kilosamples per second (ksps) sampling rate
· High signal-to-noise ratio (SNR) of 102 dB for digital-to-analog conversion and 92 dB for analog-to-digital conversion
· Integrated phase-locked loops (PLLs) supporting a wide range of audio clocks
· Low-power headphone, speaker and playback modes for portable systems
· Programmable digital audio effects including 3D sound, bass, treble, EQ and de-emphasis

Texas Instruments, www.ti.com.