NAU88L25B

Ultra-Low Power Audio CODEC for Headphone/Headsets Application

With 124dB Class G Headphone Drive and Advanced Headset Features

Description

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.

Features



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

Applications



Ultra-Portable Laptop



Mobile Device



Wireless or USB Headphone



Smart Remote Controller



Gaming Controller

NAU88L25B Product Brief Rev 1.0

Page 1 of 16

Aug 19, 2016