WAU8822
24-bit Stereo Audio Codec with Speaker Driver
emPowerAudio™
Description
The WAU8822 is a low power, high quality CODEC for portable 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 WAU8822 includes drivers for speaker, headphone, and differential or stereo
line outputs, and integrates preamps for stereo differential microphones, significantly reducing external components.
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 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‟. The digital interface can operate as either a master
or a slave. Additionally, an internal fractional PLL is available to generate accurate audio sample rate clocks for the
CODEC derived from a wide range of commonly available system clock frequencies such as 12MHz and 13MHz.
The WAU8822 operates with analog supply voltages from 2.5V to 3.6V, while the digital core can operate at 1.65V
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 WAU8822 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 WAU8822 is specified for operation from -40°C to +85°C, and is available with full automotive AEC-/Q100 &
TS16949 qualification. It is packaged in a cost-effective, space-saving 32-lead QFN package.
Standard audio interfaces: PCM and I2S
Serial control interfaces with read/write capability
Supports audio sample rates from 8kHz to 48kHz
Key Features
DAC: 94dB SNR and -84dB THD (“A” weighted)
ADC: 90dB SNR and -80dB 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
Automatic level control
Audio level limiter
Multiple filtering options
Applications
Personal Media Players
Smartphones
Personal Navigation Devices
Portable Game Players
Camcorders
Digital Still Cameras
Portable TVs
Stereo Bluetooth Headsets
Headphones/
Line drivers
LAUXIN
AUXOUT2
RAUXIN
ADC Filter
LLIN
LADC
RLIN
LMICN
LMICP
Stereo
Microphone
Interface
Input
Mixer
RADC
DAC Filter
Volume
Control
AUXOUT1
LDAC
Volume
Control
High Pass &
Notch Filters
Limiter
LHP
RDAC
5-band EQ
Output
Mixer
RHP
BTL Speaker
3D
RMICN
LSPKOUT
RMICP
RSPKOUT
Digital Audio Interface
Microphone
Bias
WAU8822 Data SheetRev 0.86
GPIO
PLL
I2S
PCM
Serial
Control
Interface
WAU8822YG
Page 1 of 21
September 4, 2008
MICBIAS
VDDA
LHP
RHP
VSSA
VREF
VDDSPK
LSPKOUT
31
31
30
30
29
29
28
28
27
27
26
26
25
25
LMICP
1
24
24
VSSSPK
LMICN
2
23
23
RSPKOUT
LLIN/GPIO2
3
22
22
AUXOUT2
RMICP
4
21
21
AUXOUT1
RMICN
5
20
20
RAUXIN
RLIN/GPIO3
6
19
19
LAUXIN
FS
7
18
18
MODE
BCLK
8
17
17
SDIO
15
16
14
VDDB
SCLK
13
CSB/GPIO1
12
MCLK
VSSD
11
DACIN
VDDC
9
10
ADCOUT
WAU8822YG
32-lead QFN
RoHS
Part Number
Dimension
Package
Package
Material
WAU8822YG
5 x 5 mm
32-QFN
Pb-Free
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
32
32
Pinout
Page 2 of 21
September 4, 2008
Pin Descriptions
Pin #
Name
Type
1
2
3
LMICP
LMICN
LLIN/GPIO2
4
5
6
RMICP
RMICN
RLIN/GPIO3
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
FS
BCLK
ADCOUT
DACIN
MCLK
VSSD
VDDC
VDDB
CSB/GPIO1
SCLK
SDIO
MODE
LAUXIN
RAUXIN
AUXOUT1
AUXOUT2
RSPKOUT
VSSSPK
Analog Input
Analog Input
Analog Input /
Digital I/O
Analog Input
Analog Input
Analog Input /
Digital I/O
Digital I/O
Digital I/O
Digital Output
Digital Input
Digital Input
Supply
Supply
Supply
Digital I/O
Digital Input
Digital I/O
Digital Input
Analog Input
Analog Input
Analog Output
Analog Output
Analog Output
Supply
25
26
LSPKOUT
VDDSPK
Analog Output
Supply
27
28
29
30
31
32
VREF
VSSA
RHP
LHP
VDDA
MICBIAS
Reference
Supply
Analog Output
Analog Output
Supply
Analog Output
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Functionality
Left MICP Input (common mode)
Left MICN Input
Left Line Input / alternate Left MICP Input / GPIO2
Right MICP Input (common mode)
Right MICN Input
Right Line Input/ alternate Right MICP Input / Digital Output
In 4-wire mode: Must be used for GPIO3
Digital Audio DAC and ADC Frame Sync
Digital Audio Bit Clock
Digital Audio ADC Data Output
Digital Audio DAC Data Input
Master Clock Input
Digital Ground
Digital Core Supply
Digital Buffer (Input/Output) Supply
3-Wire MPU Chip Select or GPIO1 multifunction input/output
3-Wire MPU Clock Input / 2-Wire MPU Clock Input
3-Wire MPU Data Input / 2-Wire MPU Data I/O
Control Interface Mode Selection Pin
Left Auxiliary Input
Right Auxiliary Input
Headphone Ground / Mono Mixed Output / Line Output
Headphone Ground / Line Output
BTL Speaker Positive Output or Right high current output
Speaker Ground (ground pin for RSPKOUT, LSPKOUT,
AUXOUT2 and AUXTOUT1 output drivers)
BTL Speaker Negative Output or Left high current output
Speaker Supply (power supply pin for RSPKOUT, LSPKOUT,
AUXOUT2 and AUXTOUT1 output drivers)
Decoupling for Midrail Reference Voltage
Analog Ground
Headphone Positive Output / Line Output Right
Headphone Negative Output / Line Output Left
Analog Power Supply
Microphone Bias
Page 3 of 21
September 4, 2008
Figure 1: WAU8822 Block Diagram
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 4 of 21
September 4, 2008
MICBIAS
VREF
RAUXIN
RLIN
RMICP
RMICN
LLIN
LMICP
LMICN
LAUXIN
32
27
20
6
4
5
3
1
2
19
PLL
MICROPHONE
BIAS
R
R
VDDA
+
-
+
Σ
LADC
MIX/BOOST
12
VSSD
BCLK
8
31
VDDA
9
FS ADCOUT
7
28
VSSA
DACIN
10
RADC
Notch
Filter
ALC
HPF
RADC
AUDIO INTERFACE
(PCM/IIS)
RADC
MIX/BOOST
Σ
ALC Control
13
14
-
VDDC
VDDB
11
MCLK
RINMIX
RDAC
Limiter
LDAC
SCLK
16
SDIO
17
18
CSB/ MODE
GPIO1
15
CONTROL INTERFACE
(2-, 3- and 4-wire)
24
VSSSPK
5 Band EQ
3D
LINMIX
26
VDDSPK
RMIX
Σ
RMAIN
MIXER
LMAIN
MIXER
Σ
LMIX
LDAC
LINMIX
RMIX
LMIX
RDAC
LDAC
RINMIX
Σ
Σ
Σ
RSPK
SUBMIXER
AUX2
MIXER
AUX1
MIXER
-6dB
Normal
-1.0X
+1.5X
-1.0X
+1.5X
-1.0X
+1.5X
-1.0X
+1.5X
23
25
29
30
22
21
RSPKOUT
LSPKOUT
RHP
LHP
AUXOUT2
AUXOUT1
Electrical Characteristics
Conditions: VDDC = 1.8V, VDDA = VDDB = VCCSPK = 3.3V, MCLK = 12.88MHz, TA = +25°C, 1kHz signal, fs = 48kHz,
24-bit audio data, 64X oversampling rate, unless otherwise stated.
Parameter
Symbol
Analog to Digital Converter (ADC)
Full scale input signal 1
Comments/Conditions
PGABST = 0dB
PGAGAIN = 0dB
Signal-to-noise ratio
SNR
Gain = 0dB, A-weighted
Total harmonic distortion 2
THD+N
Input = -3dB FS input
Channel separation
1kHz input signal
Digital to Analog Converter (DAC) driving RHP / LHP with 10kΩ / 50pF load
Full-scale output
Output boost disabled
PGA gains = 0dB
AUX1BST = 1
AUX2BST = 1
Output boost enabled
PGA gains = 0dB
AUX1BST = 0
AUX2BST = 0
Signal-to-noise ratio
SNR
A-weighted
Total harmonic distortion 2
THD+N
RL = 10kΩ; full-scale signal
Channel separation
1kHz input signal
Output Mixers
Maximum PGA gain into mixer
Minimum PGA gain into mixer
PGA gain step into mixer
Guaranteed monotonic
Speaker Output (RSPKOUT / LSPKOUT with 8Ω bridge-tied-load)
Full scale output 4
SPKBST = 1
Min
Typ
VINFS
tbd
Max
1.0
0
90
-80
103
tbd
VDDA / 3.3
Units
Vrms
dBV
dB
dB
dB
Vrms
Vrms
1.5 * (VDDA / 3.3)
88
94
-84
96
tbd
dB
dB
dB
+6
-15
3
dB
dB
dB
VCCSPK / 3.3
Vrms
(VCCSPK / 3.3) * 1.5
Vrms
Po = 200mW,
VDDSPK=3.3V
Po = 320mW,
VDDSPK = 3.3V
Po = 500mW,
VDDSPK = 5V
Po = 860mW,
VDDSPK = 5V
VDDSPK = 3.3V
*63
dB
-64
dB
-60
dB
-61
dB
91
dB
VDDSPK=5V
90
dB
81
dB
VDDSPK = 5V (boost)
72
dB
Analog Outputs (RHP / LHP; RSPKOUT / LSPKOUT)
Maximum programmable gain
Minimum programmable gain
Programmable gain step size
Guaranteed monotonic
Mute attenuation
1kHz full scale signal
+6
-57
1
85
dB
dB
dB
dB
SPKBST = 0
Total harmonic distortion
2
Signal-to-noise ratio
Power supply rejection ratio
(50Hz - 22kHz)
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
THD+N
SNR
PSRR
Page 5 of 21
September 4, 2008
Electrical Characteristics, cont’d.
Conditions: VDDC = 1.8V, VDDA = VDDB = VCCSPK = 3.3V, MCLK = 12.288MHz,
TA = +25°C, 1kHz signal, fs = 48kHz, 24-bit audio data, unless otherwise stated.
Parameter
Symbol
Headphone Output (RHP / LHP with 32Ω load)
0dB full scale output voltage
Signal-to-noise ratio
SNR
Total harmonic distortion 2
THD+N
AUXOUT1 / AUXOUT2 with 10kΩ / 50pF load
Full scale output
Signal-to-noise ratio
Total harmonic distortion 2
Channel separation
Power supply rejection ratio
(50Hz - 22kHz)
Comments/Conditions
Min
Typ
Max
Units
AVDD / 3.3
92
80
Vrms
dB
dB
85
dB
AUX1BST = 0
AUX2BST = 0
VDDSPK / 3.3
Vrms
AUX1BST = 1
AUX2BST = 1
(VDDSPK / 3.3) * 1.5
Vrms
87
-83
99
53
dB
dB
dB
dB
56
dB
A-weighted
RL = 16Ω, Po = 20mW,
VDDA = 3.3V
RL = 32Ω, Po = 20mW,
VDDA = 3.3V
SNR
THD+N
1kHz signal
PSRR
VDDSPK = 5V (boost)
Microphone Inputs (LMICP, LMICN, RMICP, RMICN, LLIN, RLIN) and Programmable Gain Amplifier (PGA)
Full scale input signal 1
PGABST = 0dB
1.0
Vrms
PGAGAIN = 0dB
0
dBV
Programmable gain
-12
35.25
dB
Programmable gain step size
Guaranteed Monotonic
0.75
dB
Mute Attenuation
120
dB
Input resistance
Inverting Input
PGA Gain = 35.25dB
1.6
kΩ
PGA Gain = 0dB
47
kΩ
PGA Gain = -12dB
75
kΩ
94
kΩ
Non-inverting Input
Input capacitance
10
pF
PGA equivalent input noise
0 to 20kHz, Gain set to
120
µV
35.25dB
Input Boost Mixer
Gain boost
Boost disabled
0
dB
Boost enabled
20
dB
Gain range LLIN / RLIN or
-12
6
dB
LAUXIN / RAUXIN to boost/mixer
Gain step size to boost/mixer
3
dB
Auxiliary Analog Inputs (LAUXIN, RAUXIN)
Full scale input signal 1
Gain = 0dB
1.0
Vrms
0
dBV
Input resistance
Aux direct-to-out path, only
Input gain = +6.0dB
20
kΩ
Input gain = 0.0dB
40
kΩ
Input gain = -12dB
159
kΩ
Input capacitance
10
pF
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 6 of 21
September 4, 2008
Electrical Characteristics, cont’d.
Conditions: VDDC = 1.8V, VDDA = VDDB = VCCSPK = 3.3V, MCLK = 12.88MHz,
TA = +25°C, 1kHz signal, fs = 48kHz, 24-bit audio data, unless otherwise stated.
Parameter
Symbol
Comments/Conditions
Automatic Level Control (ALC) & Limiter: ADC path only
Target record level
Programmable gain
Gain hold time 3
tHOLD
Doubles every gain step,
with 16 steps total
Gain ramp-up (decay) 3
tDCY
ALC Mode
ALC = 0
Limiter Mode
ALC = 1
Gain ramp-down (attack) 3
tATK
ALC Mode
ALC = 0
Limiter Mode
ALC = 1
Mute Attenuation
Microphone Bias
Bias voltage
VMICBIAS
See Figure 3
Bias current source
Output noise voltage
Digital Input/Output
Input HIGH level
IMICBIAS
Vn
1kHz to 20kHz
VIL
Min
Typ
Max
-22.5
-1.5
-12
35.25
0 / 2.67 / 5.33 / … / 43691
dBFS
dB
ms
4 / 8 / 16 / … / 4096
ms
1 / 2 / 4 / … / 1024
ms
1 / 2 / 4 / … / 1024
ms
0.25 / 0.5 / 1 / … / 128
ms
120
dB
0.50, 0.60,0.65, 0.70,
0.75, 0.85, or 0.90
3
14
VDDA
VDDA
mA
nV/√Hz
0.7 *
VDDC
Input LOW level
VIH
Output HIGH level
VOH
ILoad = 1mA
Output LOW level
VOL
ILoad = -1mA
V
0.3 *
VDDC
Input capacitance
Units
0.9 *
VDDC
V
V
0.1 *
VDDC
10
V
pF
Notes
1. Full Scale is relative to the magnitude of VDDA and can be calculated as FS = VDDA/3.3.
2. Distortion is measured in the standard way as the combined quantity of distortion products plus noise. The signal level for
distortion measurements is at 3dB below full scale, unless otherwise noted.
3. Time values scale proportionally with MCLK. Complete descriptions and definitions for these values are contained in the
detailed descriptions of the ALC functionality.
4. With default register settings, SPKVDD should be 1.5xVDDA (but not exceeding maximum recommended operating
voltage) to optimize available dynamic range in the AUXOUT1, AUXOU2, RSPKOUT, and LSPKOUT outputs stages.
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 7 of 21
September 4, 2008
Absolute Maximum Ratings
Condition
Min
Max
Units
VDDB, VDDC, VDDA supply voltages
-0.3
+3.90
V
VDDSPK supply voltage (default register configuration)
-0.3
+5.80
V
VDDSPK supply voltage (optional low voltage configuration)
-0.3
+3.90
V
Core Digital Input Voltage range
VSSD – 0.3
VDDC + 0.30
V
Buffer Digital Input Voltage range
VSSD – 0.3
VDDB + 0.30
V
Analog Input Voltage range
VSSA – 0.3
VDDA + 0.30
V
Industrial operating temperature
-40
+85
°C
Storage temperature range
-65
+150
°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may
adversely influence product reliability and result in failures not covered by warranty.
Operating Conditions
Condition
Symbol
Min
Digital supply range (Core)
VDDC
Digital supply range (Buffer)
Analog supply range
Typical
Max
Units
1.65
3.60
V
VDDB
1.65
3.60
V
VDDA
2.50
3.60
V
Speaker supply (SPKBST=0)
VDDSPK
2.50
5.50
V
Speaker supply (SPKBST=1)
VDDSPK
2.50
5.50
V
Ground
VSSD
VSSA
VSSSPK
0
V
1. VDDA must be ≥ VDDC.
2. VDDB must be ≥ VDDC.
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 8 of 21
September 4, 2008
1
General Description
The WAU8822 is a stereo device with identical left and right channels that share common support elements.
Additionally, the right channel auxiliary output path includes a dedicated submixer that supports mixing the right
auxiliary input directly into the right speaker output driver. This enables the right speaker channel to output audio
that is not present on any other output.
1.1.1 Analog Inputs
All inputs, except for the wide range programmable amplifier (PGA), have available analog input gain conditioning
of -15dB through +6dB in 3dB steps. All inputs also have individual muting functions with excellent channel
isolation and off-isolation from all outputs. All inputs are suitable for full quality, high bandwidth signals.
Each of the left-right stereo channels includes a low noise differential PGA amplifier, programmable for high-gain
input. This may be used for a microphone level through line level source. Gain may be set from +35.25db through
-12dB at the analog difference-amplifier type programmable amplifier input stage. A separate additional 20dB
analog gain is available on this input path, between the PGA output and ADC mixer input. The output of the ADC
mixer may be routed to the ADC and/or analog bypass to the analog output sections.
Each channel also has a line level input. This input may be routed to the input PGA, and/or directly to the ADC
input mixer.
Each channel has a separate additional auxiliary input. This is a line level input which may be routed the ADC input
mixer and/or directly to the analog output mixers.
1.1.2 Analog Outputs
There are six high current analog audio outputs. These are very flexible outputs that can be used individually or in
stereo pairs for a wide range of end uses. However, these outputs are optimized for specific functions and are
described in this section using the functional names that are applicable to those optimized functions.
Each output receives its signal source from built-in analog output mixers. These mixers enable a wide range of
signal combinations, including muting of all sources. Additionally, each output has a programmable gain function,
output mute function, and output disable function.
The RHP and LHP headphone outputs are optimized for driving a stereo pair of headphones, and are powered from
the main analog voltage supply rail, VDDA. These outputs may be coupled using traditional DC blocking series
capacitors. Alternatively, these may be configured in a no-capacitor DC coupled design using a virtual ground at ½
VDDA provided by an AUXOUT analog output.
The AUXOUT1 and AUXOUT2 analog outputs are powered from the VDDSPK supply rail and VSSSPK ground
return path. The supply rail may be the same as VDDA, or may be a separate voltage up to 5.5Vdc. This higher
voltage enables these outputs to have an increased output voltage range and greater output power capability.
The RSPKOUT and LSPKOUT loudspeaker outputs are powered from the VDDSPK power supply rail and
VSSGND ground return path. LSPKOUT receives its audio signal via an additional submixer. This submixer
supports combining a traditional alert sound (from the RAUXIN input) with the right channel headphone output
mixer signal. This submixer also provides the signal invert function that is necessary for the normal BTL (Bridge
Tied Load) configuration used to drive a high power external loudspeaker. Alternatively, each loudspeaker output
may be used individually as a separate high current analog output driver.
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 9 of 21
September 4, 2008
1.1.3 ADC, DAC, and Digital Signal Processing
Each left and right channel has an independent high quality ADC and DAC associated with it. These are high
performance, 24-bit delta-sigma converters that are suitable for a very wide range of applications.
The ADC and DAC functions are each individually supported by powerful analog mixing and routing. The ADC
output may be routed to the digital output path and/or to the input of the DAC in a digital passthrough mode. The
ADC and DAC blocks are also supported by advanced digital signal processing subsystems that enable a very wide
range of programmable signal conditioning and signal optimizing functions. All digital processing is with 24-bit
precision, as to minimize processing artifacts and maximize the audio dynamic range supported by the WAU8822.
The ADCs are supported by a wide range, mixed-mode Automatic Level Control (ALC), a high pass filter, and a
notch filter. All of these features are optional and highly programmable. The high pass filter function is intended
for DC-blocking or low frequency noise reduction, such as to reduce unwanted ambient noise or “wind noise” on a
microphone input. The notch filter may be programmed to greatly reduce a specific frequency band or frequency,
such as a 50Hz, 60Hz, or 217Hz unwanted noise.
The DACs are supported by a programmable limiter/DRC (Dynamic Range Compressor). This is useful to optimize
the output level for various applications and for use with small loudspeakers. This is an optional feature that may be
programmed to limit the maximum output level and/or boost an output level that is too small.
Digital signal processing is also provided for a 3D Audio Enhancement function, and for a 5-Band Equalizer. These
features are optional, and are programmable over wide ranges. This pair of digital processing features may be
applied jointly to either the ADC audio path or to the DAC audio path, but not to both paths simultaneously.
1.1.4 Voltage Reference and Microphone Bias
Built-in power management includes a high stability voltage reference. This is used as an internal reference, and to
generate a high quality, programmable microphone bias supply voltage that is well isolated from the supply rails.
This microphone bias supply is suitable for both conventional electret (ECM) type microphone, and to power the
newer MEMS all-silicon type microphones.
1.1.5 Digital Interfaces
Command and control of the device is accomplished using a 2-wire/3-wire/4-wire serial control interface. This is a
simple, but highly flexible interface that is compatible with many commonly used command and control serial data
protocols and host drivers.
Digital audio input/output data streams are transferred to and from the device separately from command and control.
The digital audio data interface supports either I2S or PCM audio data protocols, and is compatible with commonly
used industry standard devices that follow either of these two serial data formats.
1.1.6 Clock Requirements
The clocking signals required for the audio signal processing, audio data I/O, and control logic may be provided
externally, or by optional operation of a built-in PLL (Phase Locked Loop). An external master clock (MCLK)
signal must be active for analog audio logic paths to align with control register updates, and is required as the
reference clock input for the PLL, if the PLL is used.
The PLL is provided as a low cost, zero external component count optional method to generate required clocks in
almost any system. The PLL is a fractional-N divider type design, which enables generating accurate desired audio
sample rates derived from a very wide range of commonly available system clocks.
The frequency of the system clock provided as the PLL reference frequency may be any stable frequency in the
range between 8MHz and 33MHz. Because the fractional-N multiplication factor is a very high precision 24-bit
value, any desired sample rate supported by the WAU8822 can be generated with very high accuracy, typically
limited by the accuracy of the external reference frequency. Reference clocks and sample rates outside of these
ranges are also possible, but may involve performance tradeoffs and increased design verification.
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 10 of 21
September 4, 2008
2
Application Information
2.1
Typical Application Schematic
11
8
7
10
9
16
17
15
18
WAU8822
VDDSPK
VDDB
VDDC
VDDA
MCLK
BCLK
FS
DACIN
ADCOUT
VDDSPK
SCLK
SDIO
CSB/GPIO1
MODE
Analog Inputs:
No Connection
if “not used”
C16
1uF
C15
1uF
R4
1200 ohm
28
VSSSPK
VSSD
24
12
C14
1uF
ECM
“electret”
type Mic
R3
1200 ohm
R2
1000 ohm
R1
1000 ohm
C10
4.7uF
6
RLIN/GPIO3
19
LAUXIN
20
RAUXIN
1
5
C12
1uF
ECM
“electret”
type Mic
LLIN/GPIO2
C13
1uF
4
C11
1uF
32
C1
4.7uF
C2
4.7uF
C3
4.7uF
C4
4.7uF
21
C5
1uF
R9
3
2
VDDB
14
13
31
26
VSSA
AUXOUT1
VSS
Jack Switch
Detection
Example
VDDC
VSS
R5
220K ohm
VDDB
VDDA
vss
AUXOUT2
optional
R8
22
C6
1uF
Left Headphone
“tip” on 3.5mm
Stereo connector
C7
220uF
LHP
30
+
R7
vss
LMICN
RHP
LMICP
29
+
optional
R6
VSS
“sleeve” on 3.5mm
Audio connector
Right Headphone
“ring” on 3.5mm
Stereo connector
C8
220uF
RMICN
RSPKOUT
RMICP
MICBIAS
VREF
LSPKOUT
23
25
27
C9
4.7uF
VSS
Figure 2: Schematic with recommended external components for typical application with
AC-coupled headphones and stereo electret (ECM) style microphones.
Note 1: All non-polar capacitors are assumed to be low ESR type parts, such as with MLC construction or similar.
If capacitors are not low ESR, additional 0.1ufd and/or 0.01ufd capacitors may be necessary in parallel with
the bulk 4.7ufd capacitors on the supply rails.
Note 2: Load resistors to ground on outputs may be helpful in some applications to insure a DC path for the output
capacitors to charge/discharge to the desired levels. If the output load is always present and the output load
provides a suitable DC path to ground, then the additional load resistors may not be necessary. If needed,
such load resistors are typically a high value, but a value dependent upon the application requirements.
Note 3: To minimize pops and clicks, large polarized output capacitors should be a low leakage type.
Note 4: Depending on the microphone device and PGA gain settings, common mode rejection can be improved by
choosing the resistors on each node of the microphone such that the impedance presented to any noise on
either microphone wire is equal.
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 11 of 21
September 4, 2008
2.2
Power Consumption
WAU8822 has flexible power management capability which allows sections not being used to be powered down, to
draw minimum current in battery-powered applications. Table – shows typical power consumption in different
operating conditions.
Mode
OFF
Sleep
Stereo
Record
Stereo
Playback
Conditions
VREF off, no clocks,
VREF maintained @ 75kΩ, no clocks,
VREF maintained @ 300kΩ, no clocks,
VREF maintained @ 5kΩ, no clocks,
8kHz
8kHz, PLL on
16Ω HP, 44.1kHz, PLL on, sine wave
16Ω HP, 44.1kHz, quiescent
16Ω HP, 44.1kHz, white noise
16Ω HP, 44.1kHz, sine wave
16Ω HP, 44.1kHz, PLL on, sine wave
VDDA
= 3V
mA
tbd
0.1
0.0
0.0
0.3
7.9
10.4
24.5
4.4
7.2
22.0
24.5
VDDC
= 1.8V
mA
tbd
0.001
0.001
0.001
0.001
1.7
2.9
8.2
6.2
6.5
6.8
8.2
VDDB
= 3V
mA
tbd
0.0003
0.0003
0.0003
0.0003
0.005
0.07
0.07
0.005
0.005
0.005
0.07
Total
Power
mW
tbd
0.15
0.045
0.025
0.78
26.7
36.6
88.5
24.4
33.3
78.3
88.5
Table 1: Typical Power Consumption in Various Application Modes.
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 12 of 21
September 4, 2008
2.3
Supply Currents of Specific Blocks
WAU8822 can be programmed to enable/disable various analog blocks individually, and the current to some of the
major blocks can be reduced with minimum impact on performance. The table below shows the change in current
consumed with different register settings. Sample rate settings will vary current consumption of VDDC supply,
which draws consumes approximately 4mA @ 1.8V and fs = 48kHz. Lower sampling rates draw lower current.
Register
Dec Hex
Function
Bit
REFIMP[1:0]
1
01
Power
Management
1
IOBUFEN[2]
ABIASEN[3]
MICBIASEN[4]
PLLEN[5]
AUX2MXEN[6]
AUX1MXEN[7]
DCBUFEN[8]
LADCEN[0]
RADCEN[1]
2
02
Power
Management
2
LPGAEN[2]
RPGAEN[3]
LBSTEN[4]
RBSTEN[5]
SLEEP[6]
LHPEN[7]
RHPEN[8]
LDACEN[0]
RDACEN[1]
3
58
03
3A
Power
Management
3
Power
Management
4
LMIXEN[2]
RMIXEN[3]
BIASGEN[4]
RSPKEN[5]
LSPKEN[6]
AUXOUT2EN[7]
AUXOUT1EN[8]
IBIADJ[1:0]
REGVOLT[2:3]
MICBIASM[4]
LPSPKD[5]
LPADC[6]
LPIPBST[7]
LPDAC[8]
VDDA current increase/
Decrease when enabled
+100μA for 80kΩ and 300kΩ
+260μA for 3kΩ
+100μA
+600μA
+540μA
+2.5 mA +1/5mA from VDDC with
clocks applied
+200μA
+200μA
+140μA
+2.3 mA with 64X OSR
+3.3 mA with 128X OSR
+2.3 mA with 64X OSR
+3.3 mA with 128X OSR
+300μA
+300μA
+650μA
+650μA
+800μA
+800μA
+1.6 mA with 64X OSR
+1.7 mA with 128X OSR
+1.6 mA with 64X OSR
+1.7 mA with 128X OSR
+250μA
+250μA
+1.1 mA from VDDSPK
+1.1 mA from VDDSPK
+225μA
+225μA
-1.2mA with IBIADJ at 11
-1.1mA with no SNR decrease @ 8kHz
-600μA with no SNR decrease @ 8kHz
-1.1mA with 1.4dB SNR decrease
@ 44.1kHz
Table 2: VDDA 3.3V Supply Current in Various Modes
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 13 of 21
September 4, 2008
3
Appendix A: Digital Filter Characteristics
Parameter
Conditions
Min
+/- 0.015dB
0
Typ
Max
Units
0.454
fs
ADC Filter
Passband
-6dB
0.5
Passband Ripple
+/-0.015
Stopband
Stopband Attenuation
fs
0.546
f > 0.546*fs
fs
-60
Group Delay
dB
dB
28.25
1/fs
-3dB
3.7
Hz
-0.5dB
10.4
Hz
-0.1dB
21.6
Hz
ADC High Pass Filter
High Pass Filter Corner
Frequency
DAC Filter
Passband
+/- 0.035dB
0
-6dB
0.454
0.5
Passband Ripple
Stopband Attenuation
fs
+/-0.035
Stopband
f > 0.546*fs
Group Delay
fs
dB
0.546
fs
-55
dB
28
1/fs
Table 3: Digital Filter Characteristics
TERMINOLOGY
1. Stop Band Attenuation (dB) – the degree to which the frequency spectrum is attenuated (outside audio band)
2. Pass-band Ripple – any variation of the frequency response in the pass-band region
3. Note that this delay applies only to the filters and does not include other latencies, such as from the serial data interface
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 14 of 21
September 4, 2008
Figure 3: DAC Filter Frequency Response
Figure 5: ADC Filter Frequency Response
Figure 4: DAC Filter Ripple
Figure 6: ADC Filter Ripple
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 15 of 21
September 4, 2008
0
-2
d
B
r
-4
-6
10
20
30
Hz
Figure 7: ADC Highpass Filter Response, Audio Mode
0
-20
d
B -40
r
-60
-80
100
300
500
700
900
Hz
Figure 8: ADC Highpass Filter Response, HPF enabled, FS = 48kHz
0
-20
d
B -40
r
-60
-80
100
300
500
700
900
Hz
Figure 9: ADC Highpass Filter Response, HPF enabled, FS = 24kHz
0
-20
d
B -40
r
-60
-80
100
300
500
700
900
Hz
Figure 10: ADC Highpass Filter Response, HPF enabled, FS = 12kHz
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 16 of 21
September 4, 2008
+15
+10
+5
d
B
r
0
-5
-10
-15
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 11: EQ Band 1 Gains for Lowest Cut-Off Frequency
+15
+10
+5
d
B
r
0
-5
-10
-15
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 12: EQ Band 2 Peak Filter Gains for Lowest Cut-Off Frequency with EQ2BW = 0
+15
+10
+5
d
B
r
0
-5
-10
-15
20
50
100
200
500
1k
2k
5k
10k
20k
10k
20k
Hz
Figure 13: EQ Band 2, EQ2BW = 0 versus EQ2BW = 1
+15
+10
+5
d
B
r
0
-5
-10
-15
20
50
100
200
500
1k
2k
5k
Hz
Figure 14: EQ Band 3 Peak Filter Gains for Lowest Cut-Off Frequency with EQ3BW = 0
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 17 of 21
September 4, 2008
+15
+10
+5
d
B
r
0
-5
-10
-15
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 15: EQ Band 3, EQ3BW = 0 versus EQ3BW = 1
+15
T
+10
+5
d
B
r
0
-5
-10
-15
Figure 16: EQ Band 4 Peak Filter Gains for Lowest Cut-Off Frequencies with EQ4BW = 0
+15
+10
+5
d
B
r
0
-5
-10
-15
20
50
100
200
500
1k
2k
5k
10k
20k
10k
20k
Hz
Figure 17: EQ Band 4, EQ4BW = 0 versus EQ4BW =1
+15
+10
+5
d
B
r
0
-5
-10
-15
20
50
100
200
500
1k
2k
5k
Hz
Figure 18: EQ Band 5 Gains for Lowest Cut-Off Frequency
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 18 of 21
September 4, 2008
4
Appendix D: Register Overview
DEC HEX NAME
Bit 8
Bit 7
Bit 6
Bit5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
00 Software Reset
RESET (SOFTWARE)
1
01 Power Management 1
DCBUFEN AUX1MXEN AUX2MXEN
PLLEN
MICBIASEN ABIASEN
IOBUFEN
REFIMP
2
02 Power Management 2
RHPEN
NHPEN
SLEEP
RBSTEN
LBSTEN
RPGAEN
LPGAEN
RADCEN
LADCEN
3
03 Power Management 3 AUXOUT1EN AUXOUT2EN
LSPKEN
RSPKEN
BIASGEN
RMIXEN
LMIXEN
RDACEN
LDACEN
General Audio Controls
4
04 Audio Interface
BCLKP
LRP
WLEN
AIFMT
DACPHS
ADCPHS
MONO
5
05 Companding
Reserved
CMB8
DACCM
ADCCM
PASSTHRU
6
06 Clock Control 1
CLKM
MCLKSEL
BCLKSEL
Reserved
CLKIOEN
7
07 Clock Control 2
4WSPIEN
Reserved
SMPLR
SCLKEN
8
08 GPIO
Reserved
GPIO1PLL
GPIO1PL
GPIO1SEL
9
09 Jack Detect 1
JCKMIDEN
JCKDEN
JCKDIO
Reserved
10
0A DAC Control
Reserved
SOFTMT
Reserved
DACOS
AUTOMT
RDACPL
LDACPL
11
0B Left DAC Volume
LDACVU
LDACGAIN
12
0C Right DAC Volume
RDACVU
RDACGAIN
13
0D Jack Detect 2
Reserved
JCKDOEN1
JCKDOEN0
14
0E ADC Control
HPFEN
HPFAM
HPF
ADCOS
Reserved
RADCPL
LADCPL
15
F Left ADC Volume
LADCVU
LADCGAIN
16
10 Right ADC Volume
RADCVU
RADCGAIN
17
11 Reserved
Equalizer
18
12 EQ1-low cutoff
EQM
Reserved
EQ1CF
EQ1GC
19
13 EQ2-peak 1
EQ2BW
Reserved
EQ2CF
EQ2GC
20
14 EQ3-peak 2
EQ3BW
Reserved
EQ3CF
EQ3GC
21
15 EQ4-peak3
EQ4BW
Reserved
EQ4CF
EQ4GC
22
16 EQ5-high cutoff
Reserved
EQ5CF
EQ5GC
23
17 Reserved
DAC Limiter
24
18 DAC Limiter 1
DACLIMEN
DACLIMDCY
DACLIMATK
25
19 DAC Limiter 2
Reserved
DACLIMTHL
DACLIMBST
26
1A Reserved
Notch Filter
27
1B Notch Filter 1
NFCU1
NFCEN
NFCA0[13:7]
28
1C Notch Filter 2
NFCU2
Reserved
NFCA0[6:0]
29
1D Notch Filter 3
NFCU3
Reserved
NFCA1[13:7]
30
1E Notch Filter 4
NFCU4
Reserved
NFCA1[6:0]
31
1F Reserved
ALC and Noise Gate Control
32
20 ALC Control 1
ALCEN
Reserved
ALCMXGAIN
ALCMNGAIN
33
21 ALC Control 2
Reserved
ALCHT
ALCSL
34
22 ALC Control 3
ALCM
ALCDCY
ALCATK
35
23 Noise Gate
Reserved
ALCTBLSEL
ALCNEN
ALCNTH
Phase Locked Loop
36
24 PLL N
Reserved
PLLMCLK
PLLN
37
25 PLL K 1
Reserved
PLLK[23:18]
38
26 PLL K 2
PLLK[17:9]
39
27 PLL K 3
PLLK[8:0]
40
28 Mic Bias Mode
Reserved
MICBIASM
Miscellaneous
41
29 3D control
Reserved
3DDEPTH
42
2A Reserved
43
2B Right Speaker Submix
Reserved
RMIXMUT
RSUBBYP
RAUXRSUBG
RAUXSMUT
44
2C Input Control
MICBIASV
RLINRPGA RMICNRPGA RMICPRPGA
Reserved
LLINLPGA LMICNLPGA LMICPLPGA
45
2D Left Input PGA Gain
LPGAU
LPGAZC
LPGAMT
LPGAGAIN
46
2E Right Input PGA Gain
RPGAU
RPGAZC
RPGAMT
RPGAGAIN
47
2F Left ADC Boost
LPGABST
Reserved
LPGABSTGAIN
Reserved
LAUXBSTGAIN
48
30 Right ADC Boost
RPGABST
Reserved
RPGABSTGAIN
SPKSTAGE
RAUXBSTGAIN
49
31 Output Control
Reserved
LDACRMX
RDACLMX
AUX1BST
AUX2BST
SPKBST
TSEN
AOUTIMP
50
32 Left Mixer
LAUXMXGAIN
LAUXLMX
LBYPMXGAIN
LBYPLMX
LDACLMX
51
33 Right Mixer
RAUXMXGAIN
RAUXRMX
RBYPMXGAIN
RBYPRMX
RDACRMX
52
34 LHP Volume
LHPVU
LHPZC
LHPMUTE
LHPGAIN
53
35 RHP Volume
RHPVU
RHPZC
RHPMUTE
RHPGAIN
54
36 LSPKOUT Volume
LSPKVU
LSPKZC
LSPKMUTE
LSPKGAIN
55
37 RSPKOUT Volume
RSPKVU
RSPKZC
RSPKMUTE
RSPKGAIN
56
38 AUX2 Mixer
Reserved
AUXOUT2MT
Reserved
AUX1MIX>2 LADCAUX2 LMIXAUX2
LDACAUX2
57
39 AUX1 Mixer
Reserved
AUXOUT1MT AUX1HALF LMIXAUX1 LDACAUX1 RADCAUX1 RMIXAUX1
RDACAUX1
58
3A Power Management 4
LPDAC
LPIPBST
LPADC
LPSPKD
MICBIASM
REGVOLT
IBADJ
PCM Time Slot and ADCOUT Impedance Option Control
59
3B Left Time Slot
LTSLOT[8:0]
60
3C Misc
PCMTSEN
TRI
PCM8BIT
PUDEN
PUDPE
PUDPS
Reserved
RTSLOT[9]
LTSLOT[9]
61
3D Right Time Slot
RTSLOT[8:0]
Silicon Revision and Device ID
62
3E Device Revision #
Reserved
REV
63
3F Device ID
ID
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 19 of 21
September 4, 2008
Default
000
000
000
050
000
140
000
000
000
000
0FF
0FF
000
100
0FF
0FF
12C
02C
02C
02C
02C
032
000
000
000
000
000
038
00B
032
010
008
00C
093
0E9
000
000
000
033
010
010
100
100
002
001
001
039
039
039
039
001
001
000
000
020
000
xxx
xxx
5
Package Dimensions
32-lead Plastic QFN; 5X5mm2, 1.0mm thickness, 0.5mm lead pitch
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 20 of 21
September 4, 2008
6
Ordering Information
Nuvoton Part Number Description
WAU8822YG
Package Material:
G
=
Pb-free Package
Package Type:
Y
=
32-Pin QFN Package
Version History
VERSION
DATE
PAGE
DESCRIPTION
A0.0
February, 2008
NA
Preliminary Revision
A0.6
May 2008
NA
Preliminary Revision
A0.86
September 2008
NA
Preliminary Revision
Table 4: Version History
Important Notice
Nuvoton products are not designed, intended, authorized or warranted for use as components in systems or
equipment intended for surgical implantation, atomic energy control instruments, airplane or spaceship instruments,
transportation instruments, traffic signal instruments, combustion control instruments, or for other applications
intended to support or sustain life. Furthermore, Nuvoton products are not intended for applications wherein failure
of Nuvoton products could result or lead to a situation wherein personal injury, death or severe property or
environmental damage could occur.
Nuvoton customers using or selling these products for use in such applications do so at their own risk and agree to
fully indemnify Nuvoton for any damages resulting from such improper use or sales.
WAU8822 Data Sheet Rev 0.86
emPowerAudio™
Page 21 of 21
September 4, 2008
