NAU88C22
24-bit Stereo Audio Codec with Speaker Driver
Description
The NAU88C22 is a low power, high quality CODEC for portable and general purpose audio 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 NAU88C22 includes drivers for speaker,
headphone, and differential or stereo line outputs, and integrates preamps for stereo differential microphones,
significantly reducing external component requirements. Also, a fractional PLL is available to accurately
generate any audio sample rate for the CODEC using any commonly available system clock from 8MHz through
33MHz.
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/dynamic-range-
compressor (DRC) 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” and speech
band enhancement. The digital audio input/output interface can operate as either a master or a slave.
The NAU88C22 operates with analog supply voltages from 2.5V to 3.6V, while the digital core can operate at
1.7V 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 NAU88C22 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 NAU88C22 is specified for operation from -40°C to +85°C, and is available in a space-saving 32-lead QFN
package.
Key Features
DAC: 89dB SNR and -84dB THD (“A” weighted)
ADC: 89dB SNR and -78dB 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
Input automatic level control (ALC/AGC)/limiter
Output dynamic-range-compressor/limiter
Notch filter and high pass filter
Standard audio interfaces: PCM and I
2
S
Serial control interfaces with read/write capability
Real time readback of signal level and DSP status
Supports any sample rate from 8kHz, 48kHz,
Applications
Personal Media Players
Smartphones
Personal Navigation Devices
Portable Game Players
Camcorders
Digital Still Cameras
Portable TVs
Stereo Bluetooth Headsets
96kHz and 192kHz
NAU88C22 Datasheet Rev 0.6
Page 1 of 101
June, 2016
LAUXIN
RAUXIN
LLIN
RLIN
LMICN
LMICP
RMICN
RMICP
Digital Audio Interface
Microphone
Bias
GPIO
PLL
I
2
S
PCM
Serial
Control
Interface
Stereo
Microphone
Interface
Input
Mixer
RADC
ADC Filter
LADC
Volume
Control
High Pass &
Notch Filters
DAC Filter
Volume
Control
Limiter
RDAC
Output
Mixer
LDAC
Headphones/
Line drivers
AUXOUT2
AUXOUT1
LHP
RHP
BTL Speaker
LSPKOUT
RSPKOUT
5-band EQ
3D
NAU88C22LYG
Pinout
27
27
29
29
28
28
26
26
LMICP
LMICN
LLIN/GPIO2
25
25
32
32
31
31
30
30
LSPKOUT
MICBIAS
VDDSPK
VDDA
VSSA
VREF
RHP
LHP
1
2
3
4
5
6
7
8
12
14
10
11
13
15
16
9
24
24
23
23
VSSSPK
RSPKOUT
AUXOUT2
AUXOUT1
RAUXIN
LAUXIN
MODE
SDIO
RMICP
RMICN
RLIN/GPIO3
NAU88C22YG
32-lead QFN
RoHS
22
22
21
21
20
20
19
19
18
18
17
17
FS
BCLK
ADCOUT
CSB/GPIO1
VDDC
DACIN
VDDB
VSSD
MCLK
SCLK
Part Number
NAU88C22YG
Dimension
5 x 5 mm
Package
32-QFN
Package
Material
Green
NAU88C22 Datasheet Rev 0.6
Page 2 of 101
June, 2016
Pin Descriptions
Pin #
1
2
3
4
5
6
Name
LMICP
LMICN
LLIN/GPIO2
RMICP
RMICN
RLIN/GPIO3
Type
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
Analog Output
Supply
Reference
Supply
Analog Output
Analog Output
Supply
Analog Output
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/Open
Drain I/O needs external pull-up resistor
3-Wire MPU Data Input / 2-Wire MPU Data I/O /Open
Drain I/O needs external pull-up resistor
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
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
FS
BCLK
ADCOUT
DACIN
MCLK
VSSD
VDDC
VDDB
CSB/GPIO1
SCLK
SDIO
MODE
LAUXIN
RAUXIN
AUXOUT1
AUXOUT2
RSPKOUT
VSSSPK
LSPKOUT
VDDSPK
VREF
VSSA
RHP
LHP
VDDA
MICBIAS
NAU88C22 Datasheet Rev 0.6
Page 3 of 101
June, 2016
VDDB
13
Normal
12
31
28
26
24
VDDC
VSSD
VDDA
VSSA
VDDSPK
VSSSPK
14
LAUXIN
RINMIX
-6dB
19
LADC
MIX/BOOST
LINMIX
LDAC
RDAC
LMIX
-
1.0X
AUX1
MIXER
+1.5X
AUXOUT1
21
2
LMICN
-
Σ
RADC
LDAC
HPF
ALC Control
Σ
1
NAU88C22 Datasheet Rev 0.6
Σ
LMAIN
MIXER
Limiter
LHP
30
-
1.0X
+1.5X
AUXOUT2
22
LMICP
+
3
LLIN
ALC
Notch
Filter
RMAIN
MIXER
5
RMICN
-
4
RMICP
+
RLIN
6
Σ
RADC
RDAC
RMIX
29
Figure 1: NAU88C22 Block Diagram
Σ
Page 4 of 101
RADC
MIX/BOOST
5 Band EQ
3D
LINMIX
LDAC
RINMIX
LMIX
RHP
20
RAUXIN
VDDA
27
R
VREF
R
Σ
-
1.0X
32
AUX2
MIXER
+1.5X
LSPKOUT
25
MICBIAS
MICROPHONE
BIAS
Σ
AUDIO INTERFACE
(PCM/IIS)
8
7
9
10
11
-
1.0X
+1.5X
RSPKOUT
23
PLL
CONTROL INTERFACE
(2-, 3- and 4-wire)
16
17
15
18
RMIX
RSPK
SUBMIXER
MCLK SCLK SDIO
CSB/ MODE
GPIO1
June, 2016
BCLK FS ADCOUT
DACIN
Electrical Characteristics
Conditions: VDDC = 1.8V, VDDA = VDDB = VDDSPK = 3.3V (VDDSPK = 1.5*VDDA when Boost), MCLK =
12.288MHz, T
A
= +25°C, 1kHz signal, fs = 48kHz, 24-bit audio data, 64X oversampling rate, unless otherwise stated.
Parameter
Analog to Digital Converter (ADC)
Full scale input signal
1
Symbol
V
INFS
Comments/Conditions
Min
Typ
1.0
0
89
-78
106
VDDA / 3.3
Max
Units
Vrms
dBV
dB
dB
dB
V
rms
dB
dB
dB
dB
dB
dB
V
rms
V
rms
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
PGABST = 0dB
PGAGAIN = 0dB
Signal-to-noise ratio
SNR
Gain = 0dB, A-weighted
2
Total harmonic distortion
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
Gain paths all at 0dB gain
Signal-to-noise ratio
SNR
A-weighted
2
Total harmonic distortion
THD+N
R
L
= 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)
7
Full scale output
4
SPKBST = 1,
VDDSPK=VDDA
SPKBST = 0
VDDSPK= 1.5 * VDDA
2
Total harmonic distortion
THD+N
P
o
= 200mW
,
VDDSPK=3.3V
P
o
= 320mW
,
VDDSPK = 3.3V
P
o
= 860mW,
VDDSPK = 1.5 * VDDA
P
o
= 1000mW,
VDDSPK = 1.5 * VDDA
Signal-to-noise ratio
SNR
VDDSPK = 3.3V
VDDSPK=1.5 * VDDA
Power supply rejection ratio
(50Hz - 22kHz)
PSRR
VDDSPK = 3.3V
VDDSPK = 1.5 * VDDA
Analog Outputs (RHP / LHP; RSPKOUT / LSPKOUT)
Maximum programmable gain
Minimum programmable gain
Programmable gain step size
Guaranteed monotonic
Mute attenuation
1kHz full scale signal
88
89
-84
100
+6
-15
3
VDDA / 3.3
(VDDA / 3.3) * 1.5
-64
-65
-59
-37
96
94
80
76
+6
-57
1
85
NAU88C22 Datasheet Rev 0.6
Page 5 of 101
June, 2016
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