LM48822, LM48822TLEVAL

www.ti.com

SNAS456B – MAY 2008 – REVISED MARCH 2011

LM48822 Boomer ™ Ground-Referenced, Ultra High PSRR, Ultra Low Noise,

Control

Check for Samples: LM48822, LM48822TLEVAL

1

FEATURES

•

Micro-power shutdown

•

Available in space-saving 16-bump µSMD

23

•

Ground Referenced Outputs – Eliminates

package

Output Coupling Capacitors

•

Common-Mode Sense

APPLICATIONS

•

Ultra-High PSRR

•

Mobile Phones

•

•

PDAs

•

High Output Impedance in Shutdown

•

Notebook PCs

•

Differential Inputs

•

Portable Electronic Devices

•

Advanced Click-and-Pop Suppression

•

MP3 Players

•

Low Supply Current

•

Minimum external components

DESCRIPTION

The LM48822 is a single supply, ground-referenced stereo headphone amplifier designed for portable devices,

such as cell phones, where board space is at a premium. The LM48822 features National’s ground-referenced

architecture, which eliminates the large DC blocking capacitor required by traditional headphone amplifiers,

saving board space and minimizing system cost.

The LM48822 features common-mode sensing that corrects for any differences between the amplifier ground

and the potential at the headphone return terminal, minimizing noise created by any ground mismatches.

The LM48822 delivers 35mW/channel into a 16

Ω load with <1% THD+N with a 3.6V supply. High power supply

rejection ratio (PSRR), of 110dB at 217Hz, allows the device to operate in noisy environments without additional

power supply conditioning. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM48822

has a differential inputs for improved noise rejection. High output impedance in Shutdown mode, combined with a

charge pump-only mode allows the LM48822's outputs to be driven by an external source without degrading the

Shutdown mode reduces supply current consumption to 0.06µA.

Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The

LM48822 is available in an ultra-small 16-bump micro SMD package (2mmx2mm).

Table 1. Key Specifications

VALUE

UNIT

35

mW (typ)

40

mW (typ)

Quiescent Power Supply Current

at 3.6V

3.5

mA (typ)

PSRR at 217Hz

110

dB (typ)

Shutdown current

0.06

μA (typ)

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

is a trademark of ~ Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.