Datasheet > LM4915

LM4915

更新时间： 2024-09-09 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
11页	514K
描述
Pseudo-Differential Mono Headphone Amplifier with Fixed 6dB Gain

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中文翻译

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LM4915 数据手册

May 2003

LM4915

Pseudo-Differential Mono Headphone Amplifier with

Fixed 6dB Gain

General Description

Key Specifications

n Improved PSRR at 217Hz and 1kHz

75dB (typ)

The LM4915 is a pseudo-differential audio power amplifier

primarily designed for demanding applications in mobile

phones and other portable audio device applications with

mono headphones. It is capable of delivering 90 miliwatts of

continuous average power to a 32Ω BTL load with less than

1% distortion (THD+N) from a 3V_DCpower supply.

n Power Output at 5.0V & 1% THD into 32Ω 280mW (typ)

n Power Output at 3.0V & 1% THD into 32Ω 90mW (typ)

n Output Noise, A-weighted

20µV (typ)

Features

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4915 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for mobile phone and other low voltage appli-

cations where minimal power consumption is a primary re-

quirement.

n Pseudo-differential amplification

n Internal gain-setting resistors

n Available in space-saving LLP package

n Ultra low current shutdown mode

n Can drive capacitive loads up to 500pF

n Improved pop & click circuitry virtually eliminates noises

during turn-on and turn-off transitions

n 2.2 - 5.5V operation

n No output coupling capacitors, snubber networks,

bootstrap capacitors or gain-setting resistors required

n Ultra low noise

The LM4915 features a low-power consumption shutdown

mode. To facilitate this, Shutdown may be enabled by driving

the shutdown pin low. Additionally, the LM4915 features an

internal thermal shutdown protection mechanism.

The LM4915 contains advanced pop & click circuitry which

virtually eliminates noises which would otherwise occur dur-

ing turn-on and turn-off transitions.

Applications

n Mobile phones

The LM4915 has an internally fixed gain of 6dB.

n PDAs

n Portable electronics devices

Typical Application

200482B4

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS200482

www.national.com

12 3 4 5 6 7...11

中文翻译

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与LM4915相关器件

型号	品牌	获取价格	描述	数据表
LM49150	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver and Stereo Ground Referenced Headphone A
LM49150TL	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver and Stereo Ground Referenced Headphone A
LM49150TL/NOPB	NSC	获取价格	IC 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA20, GREEN, MICRO, SMD-20, Audio/Video Amplifier
LM49150TLX	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver and Stereo Ground Referenced Headphone A
LM49150TLX/NOPB	TI	获取价格	Mono Class D Audio Subsystem w/ Earpiece Driver & Stereo Gnd Ref Headphone Amps 20
LM49150TLX/NOPB	NSC	获取价格	IC 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA20, GREEN, MICRO, SMD-20, Audio/Video Amplifier
LM49151	TI	获取价格	具有集成 125mW 耳机放大器和 42mW 耳机放大器的 1.25W 单声道 D 类音频
LM49151	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers,
LM49151TL	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers,
LM49151TL/NOPB	TI	获取价格	具有集成 125mW 耳机放大器和 42mW 耳机放大器的 1.25W 单声道 D 类音频

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