NAU8822A
NAU8822A
24-bit Stereo Audio CODEC with Speaker Driver
GENERAL DESCRIPTION
The NAU8822A is a low power, high quality CODEC for portable and general purpose audio applications. In addition
to precision 24-bit stereo ADCs and DACs device integrates a broad range of additional functions to simplify
implementation of complete audio system solutions. The NAU8822A includes drivers for speaker, headphone, and
differential or stereo line outputs, and integrates preamps for stereo differential microphones, significantly reducing
external component requirements. Also, a fractional PLL is available to accurately generate any audio sample rate for
the CODEC using any commonly available system clock from 8MHz through 33MHz.
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 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” and speech band enhancement. The digital audio input/output interface can operate as either a master
or a slave.
The NAU8822A operates with analog supply voltages from 2.5V ~ 3.6V, while the digital core can operate at 1.7V to
conserve power. The loudspeaker BTL output pair and two auxiliary line outputs can operate using a 5V supply to
increase output power capability, enabling the NAU8822A to drive 1 Watt into an external speaker. Internal register
controls enable flexible power saving modes by powering down sub-sections of the chip under software control.
The NAU8822A is specified for operation from -40°C ~ +85°C.
FEATURES
Real-time readback of signal level and DSP status
Supports any sample rate from 8kHz to 48kHz
Industrial temperature range: –40°C ~ +85°C
Package is Halogen-free, RoHS-compliant and
TSCA-compliant
DAC: 94dB SNR and -84dB THD (“A” weighted)
ADC: 90dB SNR and -80dB THD (“A” weighted)
Integrated BTL speaker driver: 1W into 8Ω
Integrated head-phone driver: 40mW into 16Ω
Integrated programmable microphone amplifier
Integrated line input and line output
On-chip PLL
APPLICATIONS
Personal Media Players
Smartphones
Personal Navigation Devices
Portable Game Players
Camcorders
Digital Still Cameras
Portable TVs
Stereo Bluetooth Headsets
Integrated DSP with specific functions:
• 5-band equalizer
• 3-D audio enhancement
• Input automatic level control (ALC/AGC)/limiter
• Output dynamic-range-compressor/limiter
• Notch filter and high pass filter
Standard audio interfaces: PCM and I2S
Serial control interfaces with read/write capability
Oct 30, 2023
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Rev 3.5