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PDF NAU8820 Data sheet ( Hoja de datos )
| Número de pieza | NAU8820 | |
| Descripción | Low Power 24-Bit Stereo Audio Codec | |
| Fabricantes | Nuvoton Technology | |
| Logotipo |  |
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NAU8820
Low Power 24-bit Stereo Audio Codec with High Current Outputs
emPowerAudio™
Description
The NAU8820 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 NAU8820 includes drivers for headphones, 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 accurately any desired audio
sample rate clock for the CODEC, using any commonly available system clock from 8MHz to 33MHz and no
external parts.
The NAU8820 operates with analog supply voltages from 2.5V to 3.6V, while the digital core can operate as low
as 1.65V to conserve power. The two high current auxiliary line outputs can operate using separate supply rails
for increased output capability and design flexibility, and may be used for cap-less headphone drive. Internal
register controls enable flexible power saving modes by powering down sub-sections of the chip under software
control.
The NAU8820 is specified for operation from -40°C to +85°C. AEC-Q100 & TS16949 compliant device is
available upon request.
Key Features
DAC: 94dB SNR and -84dB THD (“A” weighted)
ADC: 90dB SNR and -80dB THD (“A” weighted)
Integrated head-phone driver: 40mW into 16Ω
Integrated programmable microphone amplifier
Integrated line input and high current 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
Standard audio interfaces: PCM and I2S
Serial control interfaces with read/write capability
Supports audio sample rates from 8kHz to 48kHz
Applications
Personal Media Players
Smartphones
Personal Navigation Devices
Portable Game Players
Camcorders
Digital Still Cameras
Portable TVs
Stereo Bluetooth Headsets
NAU8820 Design Guide Rev 1.3
emPowerAudio™
Page 1 of 23
June 28, 2016
1 page  
Electrical Characteristics
Conditions: VDDC = 1.8V, VDDA = VDDB = VDDSPK = 3.3V, MCLK = 12.288MHz, 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 4
Output boost disabled
PGA gains = 0dB
AUX1BST = 1
AUX2BST = 1
Output boost enabled
PGA gains = 0dB
AUX1BST = 0
AUX2BST = 0
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
Analog Outputs (RHP / LHP)
Maximum programmable gain
Minimum programmable gain
Programmable gain step size
Guaranteed monotonic
Mute attenuation
1kHz full scale signal
Headphone Output (RHP / LHP with 32Ω load)
0dB full scale output voltage
Signal-to-noise ratio
Total harmonic distortion 2
SNR
THD+N
AUXOUT1 / AUXOUT2 with 10kΩ / 50pF load
Full scale output 3
A-weighted
RL = 16Ω, Po = 20mW,
VDDA = 3.3V
RL = 32Ω, Po = 20mW,
VDDA = 3.3V
AUX1BST = 0
AUX2BST = 0
AUX1BST = 1
AUX2BST = 1
Signal-to-noise ratio
Total harmonic distortion 2
Channel separation
Power supply rejection ratio
(50Hz - 22kHz)
SNR
THD+N
PSRR
1kHz signal
1.0
0
tbd 90
-80 tbd
103
VDDA / 3.3
1.5 * (VDDA / 3.3)
88 94
-84 tbd
96
+6
-15
3
+6
-57
1
85
AVDD / 3.3
92
80
85
VDDSPK / 3.3
(VDDSPK / 3.3) * 1.5
87
-83
99
53
Vrms
dBV
dB
dB
dB
Vrms
Vrms
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
Vrms
dB
dB
dB
Vrms
Vrms
dB
dB
dB
dB
NAU8820 Design Guide Rev 1.3
emPowerAudio™
Page 5 of 23
June 28, 2016
5 Page 
2 Application Information
R5
220K ohm
VSS
Jack Switch
Detection
Example
R4
0 ohm
ECM
lectret?
type Mic
R3
0 ohm
ECM
lectret?
type Mic
NAU8820
11 MCLK
8 BCLK
7 FS
10 DACIN
9 ADCOUT
16 SCLK
17 SDIO
15 CSB/GPIO1
18 MODE
VDDB
VDDC
VDDA
VDDSPK
14
13
31
26
VSSA
VSSSPK
VSSD
28
24
12
VDDSPK
VDDA
VDDC
VDDB
C1
4.7uF
C2
4.7uF
C3
4.7uF
C4
4.7uF
VSS
VDDB
Analog Inputs:
No Connection
if
C16
1uF
C15
1uF
C14
1uF
R2
2200 ohm
C13
1uF
C12
1uF
C11
R1 1uF
2200 ohm
C10
4.7uF
3 LLIN/GPIO2
6 RLIN/GPIO3
19 LAUXIN
20 RAUXIN
2 LMICN
1 LMICP
5 RMICN
4 RMICP
32 MICBIAS
VREF
27
C9
4.7uF
AUXOUT1
ot used?
AUXOUT2
LHP
RHP
C5
21 1uF
22
C6
1uF
vss
C7
220uF
30
+
vss
29 +
C8
220uF
R9
optional
R8
R7
optional
R6
Left Headphone
ip? on 3.5mm
Stereo connector
VSS
leeve? on 3.5mm
Audio connector
Right Headphone
ing? on 3.5mm
Stereo connector
VSS
2.1 Typical Application Schematic
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.
Note 5: Unused analog input pins should be left as no-connection.
Note 6: Unused digital input pins should be tied to ground.
NAU8820 Design Guide Rev 1.3
emPowerAudio™
Page 11 of 23
June 28, 2016
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet NAU8820.PDF ] | |
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