NAU8224
3.1W Stereo Filter-Free Class-D Audio Amplifier
with 2 wire interface gain control
1
Description
The NAU8224 is a stereo high efficiency filter-free Class-D audio amplifier, which is capable of driving a 4 load with
up to 3.1W output power. This device provides chip enable pin with extremely low standby current and fast start-up time
of 3.4ms. The NAU8224 features a highly flexible 2 wire interface with many useful gain settings. The gain can be
selected from 24dB to -62dB (plus mute) by using 2 wire interface and GS pin.
The NAU8224 is ideal for the portable applications of battery drive, as it has advanced features like 87dB PSRR, 91%
efficiency, ultra low quiescent current (i.e. 2.1mA at 3.7V for 2 channels) and superior EMI performance. It has the
ability to configure the inputs in either single-ended or differential mode. NAU8224 is available in Miniature QFN-20
package.
Key Features
Low Quiescent Current:
•
2.1mA at 3.7V for 2 channels
•
3.2mA at 5V for 2 channels
Gain Setting with 2 wire interface and GS pin
•
24dB to -62dB (plus mute)
Powerful Stereo Class-D Amplifier:
•
2ch x 3.1W (4 @ 5V, 10% THD+N)
•
2ch x 1.26W (4 @ 3.7V, 1% THD+N)
•
2ch x 1.76W (8 @ 5V, 10% THD+N)
•
2ch x 0.76W (8 @ 3.7V, 1% THD+N)
Low Output Noise: 20 µV
RMS
@0dB gain
87dB PSRR @217Hz
Low Current Shutdown Mode
Click-and Pop Suppression
Applications
Notebooks / Tablet PCs
Personal Media Players / Portable TVs
MP3 Players
Portable Game Players
Digital Camcorders
Figure 1: NAU8224Block Diagram
NAU8224 Datasheet Rev 1.0
Page 1 of 27
Aug, 2012
2
Pinout- QFN 20 (TOP VIEW)
Part Number
NAU8224YG
Dimension
4mm x 4mm
Package
QFN-20
Package Material
Pb-Free
NAU8224Datasheet Rev 1.0
Page 2 of 27
Aug, 2012
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Pin Descriptions
Name
OUTRP
VDD
NC
EN
INR
IPR
GS
VDD
VSS
IPL
INL
SCLK
SDIO
VDD
OUTLP
VSS
OUTLN
VDD
OUTRN
VSS
Ex-Pad
Type
Analog Output
Supply
NC
Digital Input
Analog Input
Analog Input
Analog Input
Supply
Supply
Analog Input
Analog Input
Digital Input
Digital I/O
Supply
Analog Output
Supply
Analog Output
Supply
Analog Output
Supply
Analog Input
Functionality
Right Channel Positive BTL Output
Power Supply
No Connect
Chip Enable (High = Enable; Low = PD)
Right Channel Negative Input
Right Channel Positive Input
5 Selectable Gain Setting (0dB / 6dB / 12dB / 18dB / 24dB)
Power Supply
Ground
Left Channel Positive Input
Left Channel Negative Input
I2C Serial Clock
I2C serial data Input & Output
Power Supply
Left Channel Positive BTL Output
Ground
Left Channel Negative BTL Output
Power Supply
Right Channel Negative BTL Output
Ground
Thermal Tab (must be connected to VSS, QFN-20 package, only)
QFN
Notes
1. Pins designated as NC (Not Internally Connected) should be left as no-connection
Table 1: NAU8224 Pin description
NAU8224Datasheet Rev 1.0
Page 3 of 27
Aug, 2012
4
Electrical Characteristics
Symbol
Comments/Conditions
Z
L
= 4 + 33µH
THD + N = 10%
Z
L
= 4 + 33µH
THD + N = 1%
Z
L
= 8 + 68µH
THD + N = 10%
Z
L
= 8 + 68µH
THD + N = 1%
VDD = 5.0V
VDD = 3.7V
VDD = 5.0V
VDD = 3.7V
VDD = 5.0V
VDD = 3.7V
VDD = 5.0V
VDD = 3.7V
Min
Typ
3.1
1.57
2.46
1.26
1.76
0.95
1.41
0.76
Max
°
Conditions: EN = VDD = 5V, VSS = 0V, Av = 12dB Z
L
=
∞,
Bandwidth = 20Hz to 22kHz, T
A
= 25 C
Parameter
Power Delivered
Units
Output Power
(per channel)
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
Short circuit Threshold
Gain Setting
Symbol
V
EN_H
V
EN_L
Comments/Conditions
VDD = 2.5V to 5.5V
VDD = 2.5V to 5.5V
Min
1.4
-1
Typ
Max
Units
V
V
µA
°C
°C
A
0.4
+1
130
15
2.1
I
LIMIT
Tie GS to VSS
GS Connect VSS through
100k ± 5%
Tie GS pin to VDD
GS Connect VDD
through 100k ± 5%
Floating Node
A
V
= 24dB
A
V
= 18dB
A
V
= 12dB
A
V
= 6dB
A
V
= 0dB
24
18
12
6
0
35
70
140
280
558
dB
Voltage Gain
A
V
Differential Input Resistance
R
IN
k
NAU8224Datasheet Rev 1.0
Page 4 of 27
Aug, 2012
Electrical Characteristics (continued)
Conditions: EN = VDD = 5V, VSS = 0V, Av = 12dB, Z
L
=
∞,
Bandwidth = 20Hz to 22kHz, T
A
= 25 °C
Parameter
Normal Operation
Quiescent Current Consumption
Shut Down Current
Oscillator Frequency
Efficiency
Start Up Time
Output Offset Voltage
Common Mode Rejection Ratio
Click-and-Pop Suppression
DC
PSRR
AC
PSRR*
Power Supply Rejection Ratio
I
QUI
I
OFF
f
OSC
η
T
start
V
OS
CMRR
VDD = 3.7V
VDD = 5V
EN = 0
2.1
3.17
0.1
300
91
3.4
±1
80
-72
98
87
74
54
mA
mA
µA
kHz
%
msec
mV
dB
dBV
dB
dB
Symbol
Comments/Conditions
Min
Typ
Max
Units
±4
f
IN
= 1kHz
Into Shutdown (Z
L
=8 )
A Weighted
VDD = 2.5V to 5.5V
V
RIPPLE
=
0.2Vpp@217Hz**
V
RIPPLE
= 0.2Vpp@1KHz
V
RIPPLE
=
0.2Vpp@10KHz
Channel Crosstalk
f
IN
= 1kHz,
Z
L
= 8 + 68µH
*
Measured with 0.1uF capacitor on V
DD
and Battery supply
Parameter
Noise Performance
Av = 0dB (A-weighted)
Av = 6dB (A-weighted)
Av = 12dB (A-weighted)
Av = 18dB (A-weighted)
Av = 24dB (A-weighted)
The following setup is used to measure the above parameters
Symbol
Comments/Conditions
-101
dB
** Measured with 2.2uF input capacitor.
Min
Typ
20
21
27
36
52
Max
Units
µV
RMS
NAU8224Datasheet Rev 1.0
Page 5 of 27
Aug, 2012
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