lm48824tmx National Semiconductor Corporation, lm48824tmx Datasheet

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lm48824tmx

Manufacturer Part Number
lm48824tmx
Description
Class G Headphone Amplifier With I2c Volume Control
Manufacturer
National Semiconductor Corporation
Datasheet
© 2009 National Semiconductor Corporation
Class G Headphone Amplifier with I
General Description
The LM48824 is a Class G, ground-referenced stereo head-
phone amplifier designed for portable devices. The LM48824
features National’s ground-referenced architecture, which
eliminates the large DC blocking capacitors required by tra-
ditional headphone amplifiers, saving board space and mini-
mizing system cost.
The LM48824 takes advantage of National’s patent-pending
Class G architecture offering power savings compared to a
traditional Class AB headphone amplifier. Additionally, output
noise is improved by common-mode sensing that corrects for
any differences between the amplifier ground and the poten-
tial at the headphone return terminal, minimizing noise creat-
ed by any ground mismatches.
A high output impedance mode allows the LM48824's outputs
to be driven by an external source without degrading the sig-
nal. Other features include flexible power supply require-
ments, differential inputs for improved noise rejection, a low
power (2.5μA) shutdown mode, and a 32-step I
control with mute function.
The LM48824's superior click and pop suppression eliminates
audible transients on power-up/down and during shutdown.
The LM48824 is available in an ultra-small 16-bump, 0.4mm
pitch micro SMD package (1.69mm x 1.69mm)
Notice: This document is not a full datasheet. For more
information regarding this product or to order samples
please contact your local National Semiconductor sales
office or visit http://www.national.com/support/dir.html
Simplified Block Diagram
Boomer
®
is a registered trademark of National Semiconductor Corporation.
300892
PRODUCT BRIEF
2
C volume
LM48824
Key Specifications
Quiescent Power Supply Current at 3.6V
Output Power/channel at V
Output Power/channel at V
PSRR at 217Hz
Shutdown current
Features
Applications
R
R
Class G Power Savings
Ground Referenced Headphone Outputs – Eliminates
Output Coupling Capacitors
Common-Mode Sense
I
High Output Impedance in Shutdown
Differential Inputs
Advanced Click-and-Pop Suppression
Low Supply Current
Low THD mode option
Mobile Phones, PDAs, MP3 Players
Portable Electronic Devices, Notebook PCs
L
L
2
C Volume and Mode Control
= 16Ω, THD+N
= 32Ω, THD+N
2
C Volume Control
1%
1%
DD
DD
30089221
= 3.6V
= 3.6V
0.9mA (typ)
37mW (typ)
29mW (typ)
100dB (typ)
2.5μA (typ)
March 26, 2009
www.national.com

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lm48824tmx Summary of contents

Page 1

... Notice: This document is not a full datasheet. For more information regarding this product or to order samples please contact your local National Semiconductor sales office or visit http://www.national.com/support/dir.html Simplified Block Diagram Boomer ® registered trademark of National Semiconductor Corporation. © 2009 National Semiconductor Corporation LM48824 PRODUCT BRIEF 2 Key Specifications ■ ...

Page 2

Typical Application www.national.com FIGURE 1. Typical Audio Amplifier Application Circuit 2 30089270 ...

Page 3

... Top View Order Number LM48824TM See NS Package Number TMD16DDA Ordering Information Order Number Package LM48824TM 16 Bump micro SMD LM48824TMX 16 Bump micro SMD 16–Bump micro SMD Marking XY = Date code TT = Die traceability G = Boomer Family L6 = LM48824TM 30089220 Package DWG # Transport Media ...

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www.national.com 4 ...

Page 5

Physical Dimensions inches (millimeters) unless otherwise noted 16 – Bump micro SMD Order Number LM48824TM NS Package Number TMD16DDA X1 = 1690μ 1690μ 600μm 5 www.national.com ...

Page 6

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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