Voice ICs(260)

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The NAU8820 is a low power, high quality CODEC for portable and general purpose audio applications. In addition to precision 24-bit stereo ADCs and DACs, this device integrates a broad range of additional functions to simplify implementation of complete audio system solutions. The NAU8820 includes drivers for headphone, and differential or stereo line outputs, and integrates preamps for stereo differential microphones, significantly reducing external component requirements. 

Advanced on-chip digital signal processing includes a 5-band equalizer, a 3-D audio enhancer, a mixed-signal automatic level control for the microphone or line input through the ADC, and a digital limiter function for the playback path. Additional digital filtering options are available in the ADC path, to simplify implementation of specific application requirements such as “wind noise reduction”. The digital interface can operate as either a master or a salve.  Additionally, an internal fractional PLL is available to accurately generate any desired audio sample rate for the CODEC, using any commonly available system clock from 8MHz through 33MHz at no external parts.

The NAU8820 operates with analog supply voltages from 2.5V to 3.6V, while the digital core can operate as low as 1.65V to conserve power. The two high current auxiliary line outputs can operate using separate supply rails for increased output capability and design flexibility, and may be used for cap-less headphone drive.  Internal register controls enable flexible power saving modes by powering down sub-sections of the chip under software control.