The NAU8822L is a low power, high quality stereo CODEC designed for portable and general purpose applications. In addition to precision 24-bits stereo ADCs and DACs, this device integrates many additional functions to simplify implementation of full audio systems with very low parts count. The NAU8822L includes eight analog inputs, including a low-noise differential stereo microphone input, and analog output drivers for loudspeaker, headphones, and a high-current stereo line output. Outputs can be flexibly configured for single ended or differential operation.

Advanced on-chip digital signal processing includes a 5-band equalizer, 3-D spatialization, mixed-signal Automatic Level Control (ALC/limiter), and DAC output path automute and dynamic range compression (DRC). 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 192kHz using any available clock from 8MHz through 33MHz.

The NAU8822L 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 speaker outputs and stereo line outputs can run from a 5V supply for increased output. The NAU8822L is specified for operation from -40°C to +85°C. It is packaged in a space-saving 32-lead QFN package.


24-bit high performance stereo CODEC with digital signal processing

• Audio DAC: 94dB SNR and -84dB THD
• 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
  - output Dynamic Range Compression (DRC / Limiter) with Automute, Softmute
  - zero crossing detection, automute, softmute, digital ADC-to-DAC passthrough
  - optional A-Law or u-Law companding for telephony
• Supports any sample rate from 8kHz through 192kHz with 64x or 128x oversampling

Analog Inputs and Outputs

• Low distortion BTL Speaker Driver 1.0W into 8Ω @ 5V     =>  Nếu cấp nguồn 5V, dùng loa 8Ω thì công suất ra đạt 1W.
• Stereo Headset Driver, 40mW into 16Ω @ 3.3V
• High current stereo line output driver, 40mW into 16Ω @ 3.3V
• Outputs flexibly configurable for up to two differential output pairs
• Low noise, high gain stereo differential microphone amplifier
• Low noise programmable microphone bias supply voltage
• Two additional stereo line level input pairs (four additional analog inputs)

Interfaces

• I2S or PCM audio bus support with all commonly used variations    => Tiếp nhận cả tín hiệu đầu vào số lẫn tương tự
• 2-wire protocol compatible with I2C, with register readback capability  => Có khả năng điều khiển theo giao thức I2C.
• 3-wire/4-wire SPI control interface, with register readback capability => Có khả năng điều khiển theo giao diện SPI dùng 3 hoặc 4 dây.

Low Power, Low Voltage

• Analog Supply: 2.5V to 3.6V      =>  Nguồn cấp cho khối analog.
• Speaker/Line Power Supply: 2.5V to 5V    => nguồn cấp cho đường/ Loa có thể được tăng lên tới 5V để tăng âm lượng ra loa.
• Digital Supply: 1.7V to 3.6V     => Nguồn cấp cho khối xử lý số có thể chỉ cần thấp thới 1.7V

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
• PCM Time Slot Assignment for shared audio bus and multiplexing