NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier
Table of Contents
1.1
1.2
Description .................................................................................................................................................. 2
Pin Descriptions .......................................................................................................................................... 3
Operating Characteristics ............................................................................................................................ 5
1.3
1.4
Absolute Maximum Ratings ......................................................................................................................... 6
1.5
Recommended Operating Conditions ......................................................................................................... 6
1.6
Special Feature Description ........................................................................................................................ 7
1.7
Device Protection .......................................................................................................................................16
1.7.1
Thermal Overload Protection ..............................................................................................................16
1.7.2
1.7.3
Short Circuit Protection .......................................................................................................................16
Supply under Voltage Protection .........................................................................................................16
1.8
Max Power Limiting feature ........................................................................................................................16
1.8.1
Power limiting VDD independent configuration ...................................................................................17
1.8.2
1.8.3
1.8.4
1.8.5
Power limiting VDD dependent configuration ......................................................................................17
ATTACK TIME, HOLD TIME, AND RELEASE TIME...........................................................................17
Attach time Plot ...................................................................................................................................18
Hold & Release plots ...........................................................................................................................18
1.9
Power up and Power down Control ............................................................................................................18
1.10
Application diagram ....................................................................................................................................19
1.10.1
Single ended input configuration .........................................................................................................19
1.10.2
Differential input configuration .............................................................................................................19
1.11
Component selection ..................................................................................................................................19
1.11.1
Coupling Capacitors ............................................................................................................................19
1.11.2
Bypass Capacitors ..............................................................................................................................20
1.12
Layout considerations ................................................................................................................................20
1.13
Class D without filter ...................................................................................................................................20
1.14
Class D with filter ........................................................................................................................................20
1.14.1
Ferrite Bead filter .................................................................................................................................21
1.14.2
LC filter ................................................................................................................................................21
1.15
NAU8214 EMI performance .......................................................................................................................22
Package Dimensions ...............................................................................................................................................23
1.16
20 Pin QFN Package ..................................................................................................................................23
1.17
8 pin SOP package
...................................................................................................................................24
Ordering Information ...............................................................................................................................................25
1.18
Nuvoton Part Number Description ..............................................................................................................25
NAU8214 Data Sheet Rev1.6
Page 1 of 25
April 22, 2015
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier
1.1
Description
The NAU8214 is a mono high efficiency filter-free Class-D audio amplifier with variable gain amplifier, which is
capable of driving a 4Ω load with up to 2.9W output power. This device provides chip enable pin with extremely low
standby current and fast start-up time of 4ms.The NAU8214 is ideal for the portable applications of battery drive, low
quiescent current (i.e. 1.7mA at 3.6V), Max power limiting function for a given load and superior EMI performance. It
has the ability to configure the inputs in either single-ended or differential mode.
NAU8214 is available in SOP-8 package.
Key Features
Low Quiescent Current:
1.4mA at 3.6V
2.7mA at 5V
Powerful Mono Class-D Amplifier:
2.9W (4Ω @ 5V, 10% THD+N)
2.3W (4Ω @ 5V, 1% THD+N)
1.7W (8Ω @ 5V, 10% THD+N)
1.38W (8Ω @ 5V, 1% THD+N)
1.48 W (4Ω @ 3.6V, 10% THD+N)
1.2 W (4Ω @ 3.6V, 1% THD+N)
0.87 W (8Ω @ 3.6V, 10% THD+N)
0.71 W (8Ω @ 3.6V, 1% THD+N)
Low Output Noise: 56 µV
RMS
(A –Weighted @3.6V)
82dB PSRR @217Hz
Low Current Shutdown Mode
Click-and Pop Suppression
Max Power limiting feature
Applications
Smartphones
Tablet PCs
Personal Navigation Devices
Rugged hand held computer and two-way radios
VIN
ALC
VIP
Class D
Modulator
Output
Driver
R
PLMT
NAU8214
Click / Pop
Suppression
Current / Thermal
Protection
VDD
VSS
EN
NAU8214 Block Diagram
NAU8214 Data Sheet Rev1.6
Page 2 of 25
April 22, 2015
NAU8214 2.9W Mono Filter-Free Class-D Audio Amplifier
1.3
Operating Characteristics
Conditions: EN = VDD = 5V, VSS = 0V, Av = 18dB, Z
L
= ∞, Bandwidth = 20Hz to 22kHz, T
A
= 25
°
C
Parameter
Power Delivered
Z
L
= 4Ω + 33µH
THD + N = 10%
Z
L
= 4Ω + 33µH
THD + N = 1%
Z
L
= 8Ω + 68µH
THD + N = 10%
Z
L
= 8Ω + 68µH
THD + N = 1%
Symbol
V
EN_H
V
EN_L
VDD = 5.0V
VDD = 3.6V
VDD = 5.0V
VDD = 3.6V
VDD = 5.0V
VDD = 3.6V
VDD = 5.0V
VDD = 3.6V
Min
1.3
0.1
150
20
I
LIMIT
R
IN
R
EN
Symbol
A
V
= 18dB
2.0
10
300
Min
Typ
1.4
2.7
0.5
300
91
4
±1
60
92
82
Max
0.35
2.0
2.9
1.48
2.3
1.2
1.7
0.87
1.38
0.71
Typ
Max
Symbol
Comments/Conditions
Min
Typ
Max
Units
Output Power
P
out
W
Parameter
Chip Enable (EN)
Voltage Enable High
Voltage Enable Low
Input Leakage Current
Thermal and Current Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Limiting Current
Single Ended Input Resistance
Resistance (EN pin to GND)
Parameter
Normal Operation
Quiescent Current Consumption
Shut Down Current
Oscillator Frequency
Efficiency
Start Up Time
Output Offset Voltage
Common Mode Rejection Ratio
Comments/Conditions
VDD = 2.5V to 5.5V
VDD = 2.5V to 5.5V
Units
V
V
µA
°
C
°
C
A
kΩ
kΩ
Units
mA
mA
µA
kHz
%
ms
mV
dB
dB
dB
Comments/Conditions
VDD = 3.6V
VDD = 5V
EN = 0
SOP-8 (Z
L
=8Ω)
I
QUI
I
OFF
f
OSC
η
T
start
V
OS
CMRR
f
IN
= 1KHz
DC PSRR
AC PSRR
V
RIPPLE
= 0.2Vpp
@217Hz
V
RIPPLE
= 0.2Vpp@1kHz
V
RIPPLE
=
0.2Vpp@10kHz
Power Supply Rejection Ratio
PSRR
80
60
dB
dB
Noise Performance
V
DD
= 3.6V (A-weighted)
56
µV
RMS
NAU8214 Data Sheet Rev1.6
Page 5 of 25
April 22, 2015
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
