Datasheet > LM4910

LM4910

更新时间： 2024-10-01 23:16:47

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
22页	824K
描述
Output Capacitor-less Stereo 35mW Headphone Amplifier

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LM4910 数据手册

February 2003

LM4910

Output Capacitor-less Stereo 35mW Headphone

Amplifier

General Description

Key Specifications

n PSRR at f = 217Hz

65dB (typ)

The LM4910 is an audio power amplifier primarily designed

for headphone applications in portable device applications. It

is capable of delivering 35mW of continuous average power

to a 32Ω load with less than 1% distortion (THD+N) from a

3.3V_DCpower supply.

n Power Output at V_DD= 3.3V, R_L= 32Ω, and THD ≤

n Shutdown Current

35mW (typ)

0.1µA (typ)

The LM4910 utilizes a new circuit topology that eliminates

output coupling capacitors and half-supply bypass capaci-

tors (patent pending). The LM4910 contains advanced pop &

click circuitry which eliminates noises caused by transients

that would otherwise occur during turn-on and turn-off.

Features

n Eliminates headphone amplifier output coupling

capacitors (patent pending)

n Eliminates half-supply bypass capacitor (patent pending)

n Advanced pop & click circuitry eliminates noises during

turn-on and turn-off

n Ultra-low current shutdown mode

n Unity-gain stable

n 2.2V - 5.5V operation

n Available in space-saving MSOP, LLP, and SOIC

packages

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. Since the LM4910 does not require

any output coupling capacitors, half-supply bypass capaci-

tors, or bootstrap capacitors, it is ideally suited for low-power

portable applications where minimal space and power con-

sumption are primary requirements.

The LM4910 features a low-power consumption shutdown

mode, activated by driving the shutdown pin with logic low.

Additionally, the LM4910 features an internal thermal shut-

down protection mechanism. The LM4910 is also unity-gain

stable and can be configured by external gain-setting resis-

tors.

Applications

n Mobile Phones

n PDAs

n Portable eletronics devices

n Portable MP3 players

Typical Application

20030565

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS200305

www.national.com

12 3 4 5 6 7...22

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与LM4910相关器件

型号	品牌	获取价格	描述	数据表
LM49100	NSC	获取价格	Mono Class AB Audio Subsystem with a True-Ground Headphone Amplifier
LM49100_0709	NSC	获取价格	Mono Class AB Audio Sub-System with a True-Ground Headphone Amplifier
LM49101	NSC	获取价格	Mono Class AB Audio Subsystem with a True Ground Headphone Amplifier and Earpiece Switch
LM49101TM	NSC	获取价格	Mono Class AB Audio Subsystem with a True Ground Headphone Amplifier and Earpiece Switch
LM49101TMX	NSC	获取价格	Mono Class AB Audio Subsystem with a True Ground Headphone Amplifier and Earpiece Switch
LM4910LQ	NSC	获取价格	Output Capacitor-less Stereo 35mW Headphone Amplifier
LM4910MA	NSC	获取价格	Output Capacitor-less Stereo 35mW Headphone Amplifier
LM4910MM	NSC	获取价格	Output Capacitor-less Stereo 35mW Headphone Amplifier
LM4911	TI	获取价格	Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL Output
LM4911	NSC	获取价格	Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL Output

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