Nuvoton NAU82011WG User manual

NAU82011
NAU82011 6/1/2013
2.9W Mono Class-D Audio Amplifier
NAU82011WG_DEMO_REV-A
User Manual

NAU82011
NAU82011 6/1/2013
DESCRIPTION:
NAU82011WG is a mono high efficiency class-D audio amplifier with variable gain, 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.
NAU82011WG is ideal for the portable applications of battery drive, as it has advanced features like 91%
efficiency, low quiescent current (i.e. 1.2mA at 3,6V) and superior EMI performance. It has the ability to
configure the inputs in either single-ended or differential mode.
NAU82011WG is available in MSOP-8 package.
RECOMMENDED OPERATING CONDITIONS:
Parameter
Symbol
Min
Typical
Max
Units
Analog Supply Range
VDD
2.50
5.00
5.50
V
Ground
VSS
0
V
Common mode Input voltage range
VIC
0
VDD-1.0
V
Load Resistance
RL
4
Ω
Input Resistance
Rin
15
kΩ
DEMO BOARD OVERVIEW

NAU82011
NAU82011 6/1/2013
A. POWER CONNECTOR:
An external DC voltage supply whose voltage is within 2.5V to 5.5V and capable of driving 2A
current should be connected to J10. The supply leads should be kept short in order to avoid IxR
voltage drop.
B. INPUT:
Test point: TP1 is the input signal and TP2 is short to ground through R6.
RCA jack: A general RCA plug should be inserted into the RCA jack. Ensure the signal source is
originally set to the minimum level.
C. GAIN SETTINGS:
The gain of NAU82011WG is determined by input resistance and can be expressed as 300k/Rin.
The demo board offers three on-board gain selections, i.e. 6dB, 12dB and 18dB for users to change
gain setting conveniently. Installing the jumpers at the following pins sets the gain of the amplifier as
follows:
J6: 6dB
J7: 12dB
J8: 18dB
D. MUTE/ENABLE CONTROL:
Installing a jumper at J5 will enable the chip; otherwise, the chip is in mute mode.
E. OUTPUT:
Test point: VOUTN (TP3) and VOUTP (TP4) are PWM outputs.
Speaker jack: A speaker with impedance equal to or greater than 4Ωshould be inserted in J2.
NORMAL OPERATION FOR MUSIC PLAYS (12dB GAIN)

NAU82011
NAU82011 6/1/2013
SCHEMATIC:

NAU82011
NAU82011 6/1/2013
BILL OF MATERIALS:
Item
Quantity
Reference
Part
Remark
1
1
C10
10uF
Has been shifted to
C27 position*
2
1
C15
330uF
3
2
C21,C22
0.1uF
4
2
C25,C26
100 pF/100V
NC
5
1
C27
0.1uF
Has been shifted to
the mid-point
between U1 and C27*
6
2
D1,D2
6.1V
NC
7
1
J1
RCA-04X
8
1
J5
SIP-2P
9
1
J6
JP_6dB
10
1
J7
JP_12dB
11
1
J8
JP_18dB
12
1
J10
BAT
13
1
J2
SPEAKER
14
2
L1,L2
FB
15
2
L3,L4
220 ohms/2A
16
2
R2,R1
75K
17
2
R3,R4
36K
18
1
R5
NC
19
1
R6
0
20
2
R8,R7
150K
21
4
TP1,TP2,TP3,TP4
INR
22
1
U1
NAU82011WG
The bypass capacitors are often composed of 0.1uF and 10uF in parallel with ceramic type.
The length of trace between NAU82011 power pins and the bypass capacitors should be as
short as possible, typically less than 2mm. Further, 0.1uF should be placed more close
to NAU82011.