NAU8401
24-bit Stereo Audio DAC with Speaker Driver
emPowerAudio
Description
The NAU8401 is a low power, high quality audio output system for portable applications. In addition to
precision 24-bit stereo DACs, this device integrates a broad range of additional functions to simplify
implementation of complete audio systems. The NAU8401 includes drivers for speaker, headphone, and stereo
line outputs, and integrates mixing of the DAC outputs with analog input signals.
Advanced on-chip digital signal processing includes a 5-band equalizer, a 3-D audio enhancer, and a digital
limiter/dynamic range compressor function for the playback path. The digital interface can operate as either a
master or a slave. Additionally, an internal fractional-N PLL is available to generate accurate audio sample rate
clocks for the DAC derived from any available system clock from 8MHz through 33MHz.
The NAU8401 operates with analog supply voltages from 2.5V to 3.6V, while the digital core can operate as low
as 1.7V to reduce power. The loudspeaker BTL output pair and two auxiliary line outputs can use a 5V supply to
increase output power capability, enabling the NAU8401 to drive 1 Watt into an external speaker. Internal
control registers enable flexible power conserving modes, shutting down sub-sections of the chip under software
control.
The NAU8401 is specified for operation from -40C to +85C. AEC-Q100 & TS16949 compliant device is
available upon request.
Key Features
DAC: 94dB SNR and -84dB THD (A weighted)
Integrated BTL speaker driver: 1W into 8
Integrated head-phone driver: 40mW into 16
Integrated line inputs and line outputs
On-chip high resolution fractional-N PLL
Integrated DSP with specific functions:
5-band equalizer
3-D audio enhancement
Automatic level control
Audio level limiter/dynamic range compressor
2
Standard audio interfaces: PCM and I S
Serial control interfaces with read/write capability
Supports audio sample rates from 8kHz to 48kHz
Applications
Personal Navigation Devices
Personal Media Players
Personal Navigation Devices
Portable Game Players
Portable TVs
Datasheet Rev 2.5 Page 1 of 69 March, 2014 NAU8401
NAU8401 YG
Headphones/
LINPUT
Line drivers
RINPUT
AUXOUT2
AUXOUT1
Limiter/
LDAC
5-Band
3D Audio
Dynamic
Stereo
Effects
Range
LHP
Equalizer
Compressor
Output
RDAC
Mixer
RHP
BTL Speaker
Serial Control Interface LSPKOUT
Digital Audio Interface
2
I S PCM
RSPKOUT
GPIO PLL 2-wire SPI
Pinout
n/c 1 24 VSSSPK
1 24
n/c
2 23 RSPKOUT
23
3
GPIO2 22 AUXOUT2
3 22
NAU8401YG
4 21
n/c 4 21 AUXOUT1
32-lead QFN
n/c 5 20
5 20 RINPUT
RoHS
GPIO3 6 19 LINPUT
6 19
FS 7 18 MODE
7 18
8
BCLK 17 SDIO
8 17
Package
Part Number Dimension Package
Material
5 x 5 mm 32-QFN Pb-Free
NAU8401YG
Datasheet Rev 2.5 Page 2 of 69 March, 2014
9
n/c 9 3322 PRGREF
10
DACIN 10 3311 VDDA
MCLK 1111 3300 LHP
VSSD 1122 2299 RHP
13
VDDC 13 2288 VSSA
14
VDDB 14 2277 VREF
CSB/GPIO1 1155 2266 VDDSPK
SCLK 1166 2255 LSPKOUT