NUVOTON NAU88L25YGB

The NAU88L25B is an Ultra-Low-Power High-Performance Audio CODEC Ground-Referenced Headphone Amplifier with Advanced Headset Detection. The single-chip solution with microphone and ground detection and switching capabilities is designed for smartphones, tablets, Personal Computers (PCs), and other portable devices that support both analog and digital audio functions. The NAU88L25B is a cost-optimized solution for audio jack applications that benefit from enhanced audio quality and more integrated detection and suppression functions. Additionally, when used in combination with the Nuvoton NuMicro NUC123, an ARM Cortex MO-based microprocessor, the NAU88L25B Audio CODEC provides an easy-to-implement design solution for USB headphones. The highly-integrated NAU88L25B features one I2S/PCM Interface, one digital mixer, two high-quality audio Digital-to-Analog Converters (DACs), one high-quality audio Analog-to-Digital Converter (ADC), one monophonic differential analog microphone input, two analog single-ended microphone inputs, and one stereophonic Class G headphone amplifier with automatic headset detection. After automatically detecting which type of headset is in use—Stereo headphone, Nokia-type headsets, or Apple-type headsets—the NAU88L25B switches internal connections to support the appropriate format. The advanced on-chip Digital Signal Processing (DSP) engine includes a Dynamic Range Compressor (DRC), and Programmable Bi-Quad Filters for various types of filters to optimize audio quality and eliminate undesirable frequency components. The NAU88L25B Audio CODEC provides comprehensive headset detection features that support jack insertion/ejection, microphone detection, distinct key / short key / long key / key release detection and Crosstalk detection/suppression. The chip also provides an integrated Frequency Locked Loop (FLL) to support various clocks. The NAU88L25 operates with analog supply voltages from 1.6V to 1.8V, while the digital core can operate from 1.1V to 1.98V to conserve power. The NAU88L25 is specified for operation from -40°C to +85°C, and is available in QFN 32 or CSP package with 0.4mm pitch.

• DAC with auto attenuate: 124dB SNR; without auto mute: 113dB SNR, (A-weighted) @ 0dB gain, 1.8V and -89dB THDN @ 20mW and RL = 32Ω, DAC playback to headphone output mode
• ADC: 101dB SNR (A-weighted) @ 0dB MIC gain, 1.8V, Fs = 48kHz and -91dB THD, 1.8V, MIC gain 0dB, OSR 128x
• One Digital I2S/PCM I/O port
• Dynamic Range Compressor (DRC)
• Programmable Biquad filter
• One Headset Mic: One Differential Analog Mic input, Line-input or two single-ended Mic input
• One Class G Stereo Headphone Amplifier(28mW @ 32Ω, 1% THD + N)
• Sampling rate from 8K to 192 KHz
• Autonomous Headset Microphone & Ground Detection and Switching
• Jack Insertion and Ejection Detection
• Distinct Keys Detection
• Package: 32 Pin QFN package, and 42 Balls WLCSP with 0.4mm Pitch

• Ultra-Portable Laptop
• Mobile Device
• Wireless or USB Headphone
• Smart Remote Controller
• Gaming Controller