Portable Audio

The NAU8501 is a low power, high quality stereo CODEC designed for portable and general purpose applications. In addition to precision 24-bits stereo ADCs, this device integrates many additional functions to simplify implementation of full audio systems with very low parts count. The NAU8501 includes a low-noise differential stereo microphone input, an additional line level stereo input, and a stereo line level output supporting an analog bypass function with output muting and a wide range volume control.

Advanced on-chip digital signal processing includes a 5-band equalizer, 3-D spatialization, and a mixed-signal Automatic Level Control (ALC/limiter),. The ADC path also includes a parametric notch filter and high pass filters for input signal conditioning, including wind noise reduction. An internal fractional-N PLL can seamlessly support any audio clock rate from 8kHz through 48kHz using any available clock from 8MHz through 33MHz.

The NAU8501 operates with analog supply voltages from 2.5V to 3.6V, and the digital core can operate as low as 1.7V to minimize power. The NAU8501 is specified for operation from -40 ° C to +85 ° C, and is available with full automotive AEC-Q100 & TS16949 qualification. It is packaged in a space-saving 32-lead QFN package.

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24-bit high performance stereo ADC with digital signal processing

• Audio ADC: 90dB SNR and -80dB THD
• Advanced integrated signal processing feature set
  - 5-band equalizer
  - mixed-signal Automatic Level Control (ALC / Limiter)
  - parametric notch filter
  - programmable high pass filter
  - optional A-Law or u-Law compression for telephony
• Support s any sample rate from 8kHz through 48kHz with 64x or 128x oversampling

Analog Inputs and Outputs

• Low noise, high gain stereo differential microphone amplifier
• Low noise programmable microphone bias supply voltage
• One additional stereo line level input pair (two additional analog inputs)
• Stereo line level output with mute and wide attenuation range

Interfaces

• I2S or PCM audio bus support with all commonly used variations
• 2-wire protocol compatible with I2C, with register readback capability
• 3-wire/4-wire SPI control interface, with register readback capability

Low Power, Low Voltage

• Analog Supply: 2.5V to 3.6V
• Digital Supply: 1.7V to 3.6V

Additional features

• Fractional-N PLL can generate any audio clock from common system clocks
• Powerful and flexible analog mixing, routing, selection, and bypass features
• Industrial temperature range: –40 ° C to +85 ° C
• Fully qualified for automotive applications: AEC-Q100 & TS16949
• PCM Time Slot Assignment for shared audio bus and multiplexing