Datasheet > LM48820

LM48820

更新时间： 2024-11-21 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
16页	930K
描述
Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW Stereo Headphone Amplifier

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LM48820 数据手册

June 2007

LM48820

Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW

Stereo Headphone Amplifier

General Description

Key Specifications

The LM48820 is a ground referenced, fixed-gain audio power

amplifier capable of delivering 95mW of continuous average

power into a 16Ω single-ended load, with less than 1% THD

+N from a 3V power supply.

■ꢀImproved PSRR at 217Hz

■ꢀPower Output at V_DD= 3V,

R_L= 16Ω, THD+N = 1%

80dB (typ)

95mW (typ)

0.05µA (typ)

1.5V/V (typ)

1.6V to 4.5V

The LM48820 features a new circuit technology that utilizes

a charge pump to generate a negative reference voltage. This

allows the outputs to be biased about ground, thereby elimi-

nating output-coupling capacitors typically used with normal

single-ended loads.

■ꢀShutdown Current

■ꢀInternal Fixed Gain

■ꢀWide Operating Voltage Range

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal number of

external components. The LM48820 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for mobile phone and other portable applica-

tions.

Features

■

Available in space saving 0.4mm pitch micro SMD

package

Fixed Logic Levels

■

Ground referenced outputs

High PSRR

The LM48820 features a low-power consumption shutdown

mode selectable for each channel and a soft start function that

reduces start-up current transients. Additionally, the

LM48820 features an internal thermal shutdown protection

mechanism.

Ultra low current shutdown mode

Improved pop & click circuitry eliminates noises during

turn-on and turn-off transitions

No output coupling capacitors, snubber networks,

bootstrap capacitors, or gain-setting resistors required

Shutdown either channel independently

■

The LM48820 contains advanced pop & click circuitry that

eliminates noises which would otherwise occur during turn-on

and turn-off transitions.

■

Soft start feature reduces start up transient current

The LM48820 has an internal fixed gain of 1.5V/V.

Applications

Mobile Phones

■

MP3 Players

PDAs

Portable electronic devices

Notebook PCs

■

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

202023

www.national.com

12 3 4 5 6 7...16

中文翻译

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与LM48820相关器件

型号	品牌	获取价格	描述	数据表
LM48820TM/NOPB	NSC	获取价格	IC 0.095 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA14, ROHS COMPLIANT, MICRO SMD-14, Audio/Video
LM48821	NSC	获取价格	Direct Coupled, Ultra Low Noise, 52mW Differential Input Stereo Headphone Amplifier with I
LM48821TL	NSC	获取价格	IC 0.053 W, 2 CHANNEL, AUDIO AMPLIFIER, BGA16, BGA-16, Audio/Video Amplifier
LM48821TLX	NSC	获取价格	IC 0.053 W, 2 CHANNEL, AUDIO AMPLIFIER, BGA16, BGA-16, Audio/Video Amplifier
LM48821TLX/NOPB	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,BGA,16PIN,PLASTIC
LM48822	NSC	获取价格	Ground-Referenced, Ultra High PSRR, Ultra Low Noise, 35mW/Channel Stereo Headphone Amplifi
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

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