NUVOTON NAU88C22YG

The NAU88C22 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 NAU88C22 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, and a digital limiter/dynamic-range compressor (DRC) 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” and speech band enhancement. The digital audio input/output interface can operate as either a master or a slave. The NAU88C22 operates with analog supply voltages from 2.5V to 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 NAU88C22 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 NAU88C22 is specified for operation from -40°C to +85°C, and is available in a space-saving 32-lead QFN package.

• DAC: 89dB SNR and -84dB THD (“A” weighted)
• ADC: 89dB SNR and -78dB 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
• 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
• Real time readback of signal level and DSP status
• Supports any sample rate from 8kHz, 48kHz, 96kHz and 192kHz

• Personal Media Players
• Smartphones
• Personal Navigation Devices
• Portable Game Players
• Camcorders
• Digital Still Cameras
• Portable TVs
• Stereo Bluetooth Headsets