Datasheet > LM49250_08

LM49250_08

更新时间： 2022-12-19 04:23:25

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
36页	1338K
描述
Enhanced Emissions Suppression Stereo Class D Audio Sub-System with Ground Referenced Headphone Amplifier and Mono Earpiece

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

LM49250_08 数据手册

December 15, 2008

LM49250ꢀ

Enhanced Emissions Suppression Stereo Class D Audio

Sub-System with Ground Referenced Headphone

Amplifier and Mono Earpiece

General Description

Key Specifications

The LM49250 is a fully integrated audio subsystem designed

for stereo cell phone applications. The LM49250 combines a

2.4W/Ch stereo class D speaker amplifiers with a 45mW/Ch

stereo ground referenced headphone amplifier, a class AB

earpiece amplifier, National 3D enhancement, volume con-

trol, and an input mixer into a single device. The filterless class

D amplifiers deliver 1.2W/Ch into an 8Ω load with <1% THD

+N from a 5V supply.

■ꢀPower Output at V_DD= 5V

Speaker:

R_L= 4Ω, THD+N ≤ 1%

R_L= 4Ω, THD+N ≤ 10%

R_L= 8Ω, THD+N ≤ 1%

1.97W/Ch

2.4W/Ch

1.2W/Ch

Headphone:

R_L= 16Ω, THD+N ≤ 1%

R_L= 32Ω, THD+N ≤ 1%

The LM49250 features a new circuit technology that utilizes

a charge pump to generate a negative supply voltage. This

allows the headphone outputs to be biased about ground,

thereby eliminating the output-coupling capacitors.

41mW/Ch

45mW/Ch

Earpiece:

R_L= 16Ω, THD+N ≤ 1%

R_L= 32Ω, THD+N ≤ 1%

170mW

90mW

For improved noise immunity, the LM49250 features fully dif-

ferential left, right and mono inputs. The three inputs can be

mixed/multiplexed to any output combination of the loud-

speaker, headphone or earpiece amplifiers. The left and right

differential inputs can be used as separate single-ended in-

puts, mixing multiple stereo audio sources. The mixer, volume

control, and device mode select are controlled through an

I²C compatible interface.

0.1μA

87%

■ꢀShutdown Current

■ꢀEfficiency at 5V, 1W into 8Ω

■ꢀEfficiency at 3.6V, 500mW into 8Ω

85%

Features

Output short circuit and thermal overload protection prevent

the device from being damaged during fault conditions. Su-

perior click and pop suppression eliminates audible transients

on power-up/down and during shutdown.

Output Short Circuit Protection

■

Thermal Overload Protection

Stereo filterless Class D operation

Spread spectrum modulation

Ground referenced Headphone Drivers

I²C Control Interface

32-step input volume control

Output volume control

Minimum external components

Click and Pop suppression

Micro-power shutdown

Available in space-saving 36–bump µSMD package

Single supply operation

RF suppression

Applications

Mobile phones

■

Portable Navigation Devices

Portable Media Players

Boomer® is a registered trademark of National Semiconductor Corporation.

300166

www.national.com

12 3 4 5 6 7...36

下载PDF

与LM49250_08相关器件

型号	品牌	描述	获取价格	数据表
LM49250RL	NSC	Enhanced Emissions Suppression Stereo Class D Audio Sub-System with Ground Referenced Head	获取价格
LM49250RLX	TI	IC,AUDIO AMPLIFIER,TRIPLE,BGA,36PIN,PLASTIC	获取价格
LM49251	TI	Stereo Audio Subsystem with Class G Headphone Amplifier and Class D Speaker Amplifier with	获取价格
LM49251TL	TI	Stereo Audio Subsystem with Class G Headphone Amplifier and Class D Speaker Amplifier with	获取价格
LM49251TL/NOPB	TI	具有 20mW 耳机放大器的 1.37W 立体声、模拟输入 AB 类音频放大器 \| YZR	获取价格
LM49251TLX	TI	Stereo Audio Subsystem with Class G Headphone Amplifier and Class D Speaker Amplifier with	获取价格

与LM49250_08相关文章

PCF8574资料解读：主要参数分析、引脚说明
2024-05-21

1
AD637数据手册解读：主要特性、引脚及其功能解读、电气参数
2024-05-21

3
ADUM1201资料手册解读：参数分析、引脚说明、应用分析
2024-05-21

3
一文带你了解压敏电阻器在直流电路中的过压保护作用
2024-05-21

2

产品中心

服务支持

精选活动

关于我们

帮助中心

LM49250_08

LM49250_08 数据手册

与LM49250_08相关器件

与LM49250_08相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

LM49250_08

LM49250_08 数据手册

与LM49250_08相关器件

与LM49250_08相关文章

您还可以找

您在本页遇到什么问题？