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PDF NAU8822A Data sheet ( Hoja de datos )
| Número de pieza | NAU8822A | |
| Descripción | 24-bit Stereo Audio Codec | |
| Fabricantes | Nuvoton Technology | |
| Logotipo |  |
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NAU8822A
24-bit Stereo Audio Codec with Speaker Driver
Description
The NAU8822A 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 NAU8822A 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
generateany audio sample ratefor 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 NAU8822A 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 NAU8822A to drive 1 Watt into an external speaker. Internal
registercontrols enable flexible power saving modes by powering down sub-sections of the chip under software
control.
The NAU8822A is specified for operation from -40°C to +85°C, and is available with full automotive AEC-Q100 &
TS16949 qualification upon request. Please refer to ordering information for AEC-Q100 compliance part number.
The device is packaged in a cost-effective, space-saving 32-lead QFN package.
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
Input automatic level control (ALC/AGC)/limiter
Output dynamic-range-compressor/limiter
Notch filter and high pass filter
Standard audio interfaces: PCM and I2S
Serial control interfaces with read/write capability
Real-time read back of signal level and DSP status
Supports any sample rate from 8kHz to 48kHz
Applications
Personal Media Players
Smartphones
Personal Navigation Devices
Portable Game Players
Camcorders
Digital Still Cameras
Portable TVs
Stereo Bluetooth Headsets
NAU8822A Datasheet Rev 2.6
Page 1 of 91
February 28, 2017
1 page  
Electrical Characteristics
Conditions: VDDC = 1.8V, VDDA = VDDB = VDDSPK = 3.3V, MCLK = 12.88MHz, TA = +25°C, 1kHz signal, fs = 48kHz,
24-bit audio data, 64X oversampling rate, unless otherwise stated.
Parameter
Symbol Comments/Conditions Min Typ Max Units
Analog to Digital Converter (ADC)
Full scale input signal 1
VINFS
PGABST = 0dB
PGAGAIN = 0dB
Signal-to-noise ratio
Total harmonic distortion 2
SNR Gain = 0dB, A-weighted
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
1.0
0
tbd 90
-80 tbd
103
VDDA / 3.3
Vrms
dBV
dB
dB
dB
Vrms
Signal-to-noise ratio
Total harmonic distortion 2
Channel separation
SNR
THD+N
A-weighted
RL = 10kΩ; full-scale signal
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
SPKBST = 0
Total harmonic distortion 2
Signal-to-noise ratio
THD+N
SNR
Po= 200mW,
VDDSPK=3.3V
Po= 320mW,
VDDSPK = 3.3V
Po= 860mW,
VDDSPK = 5V
Po= 1000mW,
VDDSPK = 5V
VDDSPK = 3.3V
88 94
-84 tbd
96
+6
-15
3
VCCSPK / 3.3
(VCCSPK / 3.3) * 1.5
*63
-64
-60
-36
91
dB
dB
dB
dB
dB
dB
Vrms
Vrms
dB
dB
dB
dB
dB
VDDSPK=5V
90 dB
Power supply rejection ratio
(50Hz - 22kHz)
PSRR
VDDSPK = 3.3V
VDDSPK = 5V (boost)
Analog Outputs (RHP / LHP; RSPKOUT / LSPKOUT)
Maximum programmable gain
Minimum programmable gain
Programmable gain step size
Guaranteed monotonic
Mute attenuation
1kHz full scale signal
81 dB
72 dB
+6 dB
-57 dB
1 dB
85 dB
NAU8822A Datasheet Rev 2.6
Page 5 of 91
February 28, 2017
5 Page 
1 General Description
The NAU8822A is an upgrade to the WAU8822,anddelivers reduced out-of-band noise energy, improved ALC and
DSP signal processing, read-out capability of realtime signal level, readout of DSP status, and added controls for
industry leading pop/click noise management. Additionally, handling of settings for 5-volt and 3-volt operation are
simplified, and all registers unique to Nuvoton are moved to higher addresses. This makes the part a direct hardware
and software drop-in replacement for common industry parts.
The NAU8822A is a stereo part 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 differentialPGA 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 operating in the non-boost output mode.
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 alertsound (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.
A programmable low-noise MICBIAS microphone bias supply output is included. This is suitable for both
conventional electret (ECM) type microphone, and to power the newer MEMS all-silicon type microphones.
NAU8822A Datasheet Rev 2.6
Page 11 of 91
February 28, 2017
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet NAU8822A.PDF ] | |
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