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 V @0dB gain
RMS
Applications
87dB PSRR @217Hz
Notebooks / Tablet PCs
Low Current Shutdown Mode
Personal Media Players / Portable TVs
Click-and Pop Suppression
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 Dimension Package Package Material
NAU8224YG 4mm x 4mm QFN-20 Pb-Free
NAU8224Datasheet Rev 1.0 Page 2 of 27 Aug, 2012