NAU8811
Mono Audio Codec with SPI
emPowerAudio
™
1.
GENERAL DESCRIPTION
It is designed for voice
The NAU8811 is a cost effective and low power wideband MONO audio CODEC.
2
telephony related applications. Functions include Automatic Level Control (ALC) with noise gate, PGA, standard
audio interface I S, and PCM with time slot assignment. The device provides one differential microphone input
and one single ended auxiliary input (multi purpose). There are few variable gain control stages in the audio path.
It also includes Headphone (Headphone) line output and integrated BTL speaker driver.
The analog inputs have PGA on the front end, allowing dynamic range optimization with a wide range of input
sources. The microphone amplifiers have a programmable gain from -12dB to +35.25dB to handle both amplified
microphones. In addition to a digital high pass filter to remove DC offset voltages, the ADC also features voice
band digital filtering. Voice-band data is accepted by the audio interface (I S). The DAC converter path includes
filtering and mixing, programmable-gain amplifiers (PGA), and soft muting.
The digital interface SPI have
2
independent supply voltage to allow integration into multiple supply systems. The NAU8811 operates at supply
voltages from 2.5V to 3.6V, although the digital core can operate at voltage as low as 1.71V to save power.
The NAU8811 is specified for operation from -40C to +85C. AEC-Q100 & TS16949 compliant device is
available upon request.
2.
FEATURES
24-bit signal processing linear Audio CODEC
Audio DAC: 93dB SNR and -84dB THD
Audio ADC: 91dB SNR and -79dB THD
Support variable sample rates from 8 - 48kHz
Integrated BTL Speaker Driver 1W (8Ω / 5V)
Integrated Headset Driver 40mW (16Ω / 3.3V)
Analog I/O
Integrated programmable Microphone Amplifier
Integrated Line Input and Line Output
Integrated Audio Switches
Headphone / Speaker / Line Output selection
Microphone / Line Inputs selection
Interfaces
2
I S digital interface PCM time slot assignment
SPI serial control Interface
emPowerAudio
™
Datasheet Revision 2.5
Page 1 of 87
January 2015
NAU8811
Low Power, Low Voltage
Analog Supply: 2.5V to 3.6V
Digital Supply: 1.71V to 3.6V
Nominal Operating Voltage: 3.3V
Additional features
Programmable ALC and ADC Notch Filter
Programmable High Pass Filter
Digital D/A Passthrough
AEC-Q100 & TS16949 compliant device available upon request
Industrial temperature: range: –40C to +85C
Applications
VoIP Telephones
IP PBX
Mobile Telephone Hands-free Kits
Residential & Consumer Intercoms
General Purpose low power audio CODEC
AUX
Microphone
Interface
MIC-
MIC+
Input
Mixers &
Gain
Stage
ADC
ADC Filter
Volume
Control
HPF
Notch
Filter
MOUT
DAC Filter
Volume
Control
Limiter
DAC
Output
Mixers
SPKOUT+
-1
SPKOUT-
Digital Audio Interface
I
2
S
PCM
Control IF
SPI
Audio I/O
Digital I/O
emPowerAudio
™
Datasheet Revision 2.5
Page 2 of 87
January 2015
NAU8811
4.
PIN DESCRIPTION
Pin Name
MIC+
VDDA
VSSA
VDDD
VSSD
ADCOUT
DACIN
FS
BCLK
CSb
SCLK
SDIO
MOUT
SPKOUT+
VSSSPK
SPKOUT-
VDDSPK
AUX
VREF
MIC-
Pin#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Functionality
Microphone Positive Input
Analog Supply
Analog Ground
Digital Supply
Digital Ground
Digital Audio Data Output
Digital Audio Data Input
Frame Sync (Slave)
Bit Clock (Slave)
SPI Chip Select
SPI Serial Clock
SPI Data In
Headphone Output
Speaker Positive Output
Speaker Ground
Speaker Negative Output
Speaker Supply
Auxiliary Input
Decoupling internal analog mid supply reference
voltage
Microphone Negative Input
The exposed metal paddle on the bottom of the IC
supplies circuit ground(s) for the entire chip. It is
very important that a good solder connection is
made between this exposed metal paddle and the
ground plane of the PCB underlying the IC.
Table 1: Pin Description
A/D
A
A
A
D
D
D
D
D
D
D
D
D
A
A
A
A
A
A
A
A
Pin Type
I
I
O
I
O
O
I
I/O
I
I/O
I
O
O
O
O
O
I
I
O
I
PADDLE_VSSA
PKG
A
O
Notes
1.
The 20-QFN package includes a bulk ground connection pad on the underside of the chip. This bulk ground
should be thermally tied to the PCB, and electrically tied to the analog ground.
2.
3.
Unused analog input pins should be left as no-connection.
Under all condition when digital pins are not used they should be tied to ground.
emPowerAudio
™
Datasheet Revision 2.5
Page 4 of 87
January 2015
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
