lm49100gr National Semiconductor Corporation, lm49100gr Datasheet

lm49100gr

Manufacturer Part Number

lm49100gr

Description

Mono Class Ab Audio Subsystem With A True-ground Headphone Amplifier

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM49100GR.pdf (26 pages)

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LM49100

Mono Class AB Audio Sub-System with a True-Ground

Headphone Amplifier

General Description

The LM49100 is a fully integrated audio subsystem capable

of delivering 1.275W of continuous average power into a

mono 8Ω bridged-tied load (BTL) with 1% THD+N and with a

5V power supply. The LM49100 also has a stereo true-ground

headphone amplifier capable of 50mW per channel of con-

tinuous average power into a 32Ω single-ended (SE) loads

with 1% THD+N.

The LM49100 has three input channels. One pair of SE inputs

can be used with a stereo signal. The other input channel is

fully differential and may be used with a mono input signal.

The LM49100 features a 32-step digital volume control and

ten distinct output modes. The mixer, volume control, and de-

vice mode select are controlled through an I

interface.

Thermal overload protection prevent the device from being

damaged during fault conditions. Superior click and pop sup-

pression eliminates audible transients on power-up/down and

during shutdown.

Boomer® is a registered trademark of National Semiconductor Corporation.

300015

C compatible

Key Specifications

Features

■

Applications

■

Mono and stereo inputs

Thermal Overload Protection

True-ground Headphone Drivers

Input mute attenuation

2nd Stage headphone attenuator

32-step digital volume control

10 Operating Modes

Minimum external components

Click and Pop suppression

Micro-power shutdown

Available in space-saving 3mm x 3mm 25 bump GR

package

RF Suppression

Mobile Phones

PDAs

Laptops

Portable Electronics

Loudspeaker (LS):

Headphone (V

Power Output at V

Shutdown current

C Control Interface

= 8Ω, THD+N

= 32Ω, THD+N

HP = 2.8V):

≤

= 5V:

September 2007

www.national.com

1.275W

0.01µA

50mW

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