Datasheet > LM4917SD

LM4917SD

更新时间： 2024-09-22 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
18页	1205K
描述
Ground-Referenced, 95mW Stereo Headphone Amplifier

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LM4917SD 数据手册

November 2004

LM4917

Ground-Referenced, 95mW Stereo Headphone Amplifier

General Description

Key Specifications

The LM4917 is a stereo, output capacitor-less headphone

amplifier capable of delivering 95mW of continuous average

power into a 16Ω load with less than 1% THD+N from a

single 3V power supply.

Improved PSRR at 1kHz

Power Output at V_DD= 3V,

R_L= 16Ω, THD % 1%

Shutdown Current

70dB (typ)

95mW (typ)

0.01µA (typ)

The LM4917 provides high quality audio reproduction with

minimal external components. A ground referenced output

eliminates the output coupling capacitors typically required

by single-ended loads, reducing component count, cost and

board space consumption. This makes the LM4917 ideal for

mobile phones and other portable equipment where board

space is at a premium. Eliminating the output coupling ca-

pacitors also improves low frequency response.

Features

n Ground referenced outputs

n High PSRR

n Available in space-saving TSSOP package

n Ultra low current shutdown mode

The LM4917 operates from a single 1.4V to 3.6V power

supply, features low 0.02% THD+N and 70dB PSRR. Inde-

pendent right/left channel low-power shutdown controls pro-

vide power saving flexibility for mono/stereo applications.

Superior click and pop suppression eliminates audible tran-

sients during start up and shutdown. Short circuit and ther-

mal overload protection protects the device during fault con-

ditions.

n Improved pop & click circuitry eliminates noises during

turn-on and turn-off transitions

n 1.4 – 3.6V operation

n No output coupling capacitors, snubber networks,

bootstrap capacitors

n Shutdown either channel independently

Applications

n Notebook PCs

n Desktop PCs

n Mobile Phone

n PDAs

n Portable electronic devices

Block Diagram

200893B8

FIGURE 1. Circuit Block Diagram

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

DS200893

www.national.com

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