Datasheet > LM48822

LM48822

更新时间： 2024-11-04 05:42:23

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	557K
描述
Ground-Referenced, Ultra High PSRR, Ultra Low Noise, 35mW/Channel Stereo Headphone Amplifier with CommonMode Sense, and I2C Volume Control

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LM48822 数据手册

July 10, 2008

LM48822

Ground-Referenced, Ultra High PSRR, Ultra Low Noise,

35mW/Channel Stereo Headphone Amplifier with Common

Mode Sense, and I²C Volume Control

General Description

Key Specifications

The LM48822 is a single supply, ground-referenced stereo

headphone amplifier designed for portable devices, such as

cell phones, where board space is at a premium. The

LM48822 features National’s ground-referenced architecture,

which eliminates the large DC blocking capacitor required by

traditional headphone amplifiers, saving board space and

minimizing system cost.

■ Output Power/channel at V_DD= 3.6V

R_L= 16Ω, THD+N ≤ 1%

35mW (typ)

40mW (typ)

■ Output Power/channel at V_DD= 3.6V

R_L= 32Ω, THD+N ≤ 1%

■ꢀQuiescent Power Supply Current

The LM48822 features common-mode sensing that corrects

for any differences between the amplifier ground and the po-

tential at the headphone return terminal, minimizing noise

created by any ground mismatches.

at 3.6V

3.5mA (typ)

110dB (typ)

■ꢀPSRR at 217Hz

■ꢀShutdown current

0.06μA (typ)

The LM48822 delivers 35mW/channel into a 16Ω load with

<1% THD+N with a 3.6V supply. High power supply rejection

ratio (PSRR), of 110dB at 217Hz, allows the device to operate

in noisy environments without additional power supply condi-

tioning. Flexible power supply requirements allow operation

from 2.4V to 5.5V. The LM48822 has a differential inputs for

improved noise rejection. High output impedance in Shut-

down mode, combined with a charge pump-only mode allows

the LM48822's outputs to be driven by an external source

without degrading the source signal. Additionally, the

LM48822 features a 64-step I²C volume control and mute

function. The low power Shutdown mode reduces supply cur-

rent consumption to 0.06µA.

Features

■

Ground Referenced Outputs – Eliminates Output Coupling

Capacitors

Common-Mode Sense

■

Ultra-High PSRR

I²C Volume and Mode Control

High Output Impedance in Shutdown

Differential Inputs

Advanced Click-and-Pop Suppression

Low Supply Current

Superior click and pop suppression eliminates audible tran-

sients on power-up/down and during shutdown. The

LM48822 is available in an ultra-small 16-bump micro SMD

package (2mmx2mm)

Minimum external components

Micro-power shutdown

Available in space-saving 16-bump µSMD package

Applications

Mobile Phones

■

PDAs

Notebook PCs

Portable Electronic Devices

MP3 Players

■

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

300610

www.national.com

12 3 4 5 6 7...22

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与LM48822相关器件

型号	品牌	获取价格	描述	数据表
LM48822TL	NSC	获取价格	Ground-Referenced, Ultra High PSRR, Ultra Low Noise, 35mW/Channel Stereo Headphone Amplifi
LM48823	NSC	获取价格	Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume Control and Reset
LM48823TL	NSC	获取价格	Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume Control and Reset
LM48823TL/NOPB	NSC	获取价格	IC 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA16, 2 X 2 MM, GREEN, MICRO, SMD-16, Audio Con
LM48823TLX	NSC	获取价格	Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume Control and Reset
LM48823TLX/NOPB	TI	获取价格	Mono, Bridge-Tied Load, Ceramic Speaker Driver with I<sup>2</sup>C Volume Cont
LM48823TLX/NOPB	NSC	获取价格	IC 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA16, 2 X 2 MM, GREEN, MICRO, SMD-16, Audio Con
LM48824	NSC	获取价格	Class G Headphone Amplifier with I2C Volume Control
LM48824TM	NSC	获取价格	Class G Headphone Amplifier with I2C Volume Control
LM48824TMX	NSC	获取价格	Class G Headphone Amplifier with I2C Volume Control

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