Datasheet > LM49100

LM49100

更新时间： 2024-10-02 04:20:07

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器
页数	文件大小	规格书
24页	2075K
描述
Mono Class AB Audio Subsystem with a True-Ground Headphone Amplifier

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LM49100 数据手册

June 2007

LM49100

Mono Class AB Audio Subsystem with a True-Ground

Headphone Amplifier

General Description

Key Specifications

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.

■ꢀPower Output at V_DD= 5V:

ꢀꢀSpeaker:

ꢀꢀR_L= 8Ω, THD+N ≤ 1%

1.275W

ꢀꢀHeadphone (V_DDHP = 2.8V):

ꢀꢀR_L= 32Ω, THD+N ≤ 1%

50mW

0.01µA

■ꢀShutdown current

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 I²C compatible

interface.

Features

Mono and stereo inputs

■

Thermal Overload Protection

True-ground Headphone Drivers

I²C Control 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.

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

■

Applications

Mobile Phones

■

PDAs

Laptops

Portable Electronics

Boomer® is a registered trademark of National Semiconductor Corporation.

300015

www.national.com

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