NAU8223
3.1W Stereo Filter-Free Class-D Audio Amplifier
1
Description
The NAU8223 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. It has five selectable gain settings (i.e. 0dB, 6dB, 12dB, 18dB and 24dB), which can be controlled by a single
gain pin.
The NAU8223 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.
NAU8223 is available in Miniature QFN-20 package and TSSOP-20 package.
Key Features
Low Quiescent Current:
•
2.1mA at 3.7V for 2 channels
•
3.2mA at 5V for 2 channels
5 Selectable Gain Settings:
•
0dB / 6dB / 12dB / 18dB / 24dB
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: NAU8223Block Diagram
NAU8223 Datasheet Rev 1.3
Page 1 of 23
July, 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
TSSOP
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
-
Name
OUTRP
VDD
NC
EN
INR
IPR
GS
VDD
VSS
IPL
INL
NC
NC
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
NC
NC
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
No Connect
No Connect
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: NAU8223 Pin description
NAU8223Datasheet Rev 1.4
Page 4 of 23
August, 2013
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
Units
Conditions: EN = VDD = 5V, VSS = 0V, Av = 12dB Z
L
=
∞,
Bandwidth = 20Hz to 22kHz, T
A
= 25
o
C
Parameter
Power Delivered
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
o
o
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
C
C
A
24
18
12
6
0
35
70
140
280
558
dB
Voltage Gain
A
V
Differential Input Resistance
R
IN
k
NAU8223Datasheet Rev 1.4
Page 5 of 23
August, 2013
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