LM48821, LM48821TLEVAL

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SNAS354A – JUNE 2007 – REVISED MAY 2013

LM48821

Direct Coupled, Ultra Low Noise, 52mW

Differential Input Stereo Headphone Amplifier with I2C Volume Control

Check for Samples: LM48821, LM48821TLEVAL

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FEATURES

DESCRIPTION

With

its

directly-coupled

output

technology,

the

2

•

Ground Referenced Outputs

LM48821 is a variable gain audio power amplifier

•

Differential Inputs

capable of delivering 52mWRMS per channel into a

•

I2C Volume and Mode Controls

16

Ω single-ended load with less than 1% THD+N

from a 3V power supply. The I2C volume control has

•

Available in Space-Saving DSBGA Package

a range of –76dB to 18dB.

•

Ultra Low Current Shutdown Mode

The

LM48821's

Tru-GND

technology

utilizes

•

Advanced Output Transient Suppression

advanced charge pump technology to generate the

Circuitry Eliminates Noises During Turn-On

LM48821’s negative supply voltage. This eliminates

and Turn-Off Transitions

the need for output-coupling capacitors typically used

•

2.0V to 4.0V Operation (PVDD and SVDD)

with single-ended loads.

•

1.8 to 4.0V Operation (I2CVDD)

Boomer

audio

power

amplifiers

were

designed

•

No Output Coupling Capacitors, Snubber

specifically to provide high quality output power with a

Networks, Bootstrap Capacitors, or Gain-

minimal

amount

of

external

components.

The

Setting Resistors Required

LM48821 does not require output coupling capacitors

or bootstrap capacitors, and therefore, is ideally

suited for mobile phone and other low voltage

APPLICATIONS

applications where minimal power consumption is a

•

Notebook PCs

primary requirement.

•

Desktop PCs

The LM48821 incorporates selectable low-power

•

Mobile Phones

consumption shutdown and channel select modes.

•

PDAs

The LM48821 contains advanced output transient

•

Portable Electronic Devices

suppression circuitry that eliminates noises which

would otherwise occur during turn-on and turn-off

•

MP3 Players

transitions.

KEY SPECIFICATIONS

•

Improved PSRR at 217Hz: 82dB (typ)

•

Stereo Output Power at VDD = 3V, RL = 16

Ω,

THD+N = 1%: 52mW (typ)

•

Mono Output Power at VDD = 3V, RL = 16

Ω,

THD+N = 1%: 93mW (typ)

•

Shutdown current: 0.1

μA (typ)

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2013, 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.