Nuvoton NAU82011WG User manual

NAU82011WG
NAU82011WG User Manual March, 2016
Rev 1.0
NAU82011WG Evaluation Board User Manual

NAU82011WG
NAU82011WG User Manual March, 2016
Rev 1.0
1. General Description
The NAU82011WG is a mono high efficiency filter-free Class-D audio amplifier with variable
gain, which is capable of driving a 4Ω load with up to 2.9 W output power. This device provides
chip enable pin with extremely low standby current and fast start-up time. The ability to
configure with either single-ended or differential inputs is included. The NAU82011WG has
advanced features like 100dB SNR, 91% efficiency and low quiescent current. The
NAU82011WG is ideal for the portable applications of battery drive.
2. EVB Set Up
GND
VDD
Normally open switch
Switch closed (Press ) –Device disabled
Switch open (Release) –Device enabled
INPUT
OUTPUT
(Insert load)
Gain setting resistors

NAU82011WG
NAU82011WG User Manual March, 2016
Rev 1.0
Power Connection
An external DC Voltage supply with a compliance of at least 2 Amperes should be connected to VDD &
GND.
Gain Setting
NAU82011WG is a variable gain amplifier. The gain can be varied by varying the external input
resistors(R1). The device has an on chip feedback resistor of 300kΩ. The gain is expressed as follows
  
 󰇡 󰇢󰇛󰇜  
The Evaluation board comes with 150kΩ resistors or a Gain of 6dB.
Input Connection
The default input configuration is single ended mode. If differential configuration is desired then, the 0
ohm resistor R3 needs to be removed. If Audio Precision Analyzer is used as input source,
Unbalanced inputs are to be selected for single ended operation or Balanced inputs for differential
mode.
Output Connection
An 8 ohm 68uH load should be connected on the output channel (J3- J2). Connect the outputs to the
inputs of the Audio Precision Analyzer (Balanced) via the AP0025 Aux Filter.
Power Up
For optimum performance the board should be power up with in switch closed state. Once the power is
applied switch must be released to power up the board. Then, the input signal can be applied.
Important note:

NAU82011WG
NAU82011WG User Manual March, 2016
Rev 1.0
When using a power supply, it is recommended to use a 330µF capacitor across the power pins to
suppress any supply glitches, as a safety measure. When a battery is used, the capacitor is
not required. In normal applications too, the capacitor is not required.
3. Schematic:
TP3
C9
0.1u
PD_BAR
FB2
220ohms/2A
IPR
C6
100 pfd/100V
SW1
SW PUSHBUTTON-SPST
J5
BANANA
R1 150K
C2
.1uF/16V
R41.0K
FB1
220 ohms/2A
PD_BAR
VDDA
C4 4700pFd/50V
U1
NAU82011 MSOP8
1
2
3
4
8
7
6
5
SDB
NC
INP
INN
OUTN
GND
VDD
OUTP
C7
100 pfd/100V
D1
6.1V
TPOUT-
C8
4700pFd/50V
C3
.1uF/16V
R7
1.0K
RCA Jack
Mono Differential
Inputs
TPOUT+
C1
0.1uFd/25V
C10
10u
TP1
R3
0
VDDA
D2
6.1V
VDDA
J4
BANANA
TP2
J2
OUT-
J1
RCA-04X
1
2
J3
OUT+
INR
R2
150K
C5
0.1uFd/25V
VDDA

NAU82011WG
NAU82011WG User Manual March, 2016
Rev 1.0
1 Revision History
VERSION
DATE
PAGE/
CHAP.
DESCRIPTION
V.05
Oct. 8, 2013
-
First Release.
V1.0
March, 2016
-
Updated content
Important Notice
Nuvoton products are not designed, intended, authorized or warranted for use as components in systems or
equipment intended for surgical implantation, atomic energy control instruments, airplane or spaceship
instruments, transportation instruments, traffic signal instruments, combustion control instruments, or for other
applications intended to support or sustain life. Furthermore, Nuvoton products are not intended for applications
wherein failure of Nuvoton products could result or lead to a situation where personal injury, death or severe
property or environmental damage could occur.
Nuvoton customers using or selling these products for use in such applications do so at their own risk and agree
to fully indemnify Nuvoton for any damages resulting from such improper use or sales.
Please note that all data and specifications are subject to change without notice. All the trademarks of products
and companies mentioned in this datasheet belong to their respective owners.