| Description |
The NAU8814 is a cost effective and low power wideband MONO audio CODEC. The NAU8814 is designed for voice telephony related applications. Functions include 5-band Graphic Equalizer, Automatic Level Control (ALC) with noise gate, PGA, standard audio interface I2S, PCM with time slot assignment, and on-chip PLL. The device provides one pseudo-differential microphone input and one single ended auxiliary input (multi purpose). There are several variable gain control stages in the audio path. It also includes MONO line output and integrated BTL speaker driver.
The analog inputs have PGA on the front end, allowing dynamic range optimization with a wide range of input sources. The microphone amplifiers have a programmable gain from -12dB to +35.25dB to handle both amplified microphones. In addition to a digital high pass filter to remove DC offset voltages, the ADC also features voice band digital filtering. Voice band data is accepted by the audio interface (I2S). The DAC converter path includes filtering and mixing, programmable-gain amplifiers (PGA), and soft muting. The digital control interfaces, SPI & 2-Wire (I2C style), have independent supply voltage to allow integration into multiple supply systems. The NAU8814 operates at supply voltages from 2.5V to 3.6V, although the digital core can operate at voltage down to 1.71V to save power. Target applications include VoIP phones, general purpose telephony, and telematics.
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