Datasheet > LM49151

LM49151

更新时间： 2024-09-10 05:42:23

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器放大器
页数	文件大小	规格书
4页	170K
描述
Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers, Speaker Protection and No Clip with Clip Control

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LM49151 数据手册

PRELIMINARY

LM49151

April 16, 2009

PRODUCT BRIEF

Mono Class D Audio Subsystem with Earpiece Driver,

Ground Referenced Headphone Amplifiers, Speaker

Protection and No Clip with Clip Control

General Description

Key Specifications

The LM49151 is a fully integrated audio subsystem designed

for portable handheld applications such as cellular phones.

The LM49151 combines a 1.25W mono E²S class D amplifier,

125mW Class AB earpiece driver, 42mW/channel stereo

ground referenced headphone drivers, volume control, input

mixer/multiplexer, and speaker protection into a single de-

vice.

■ꢀOutput power at V_DD= 3.3V

ꢀꢀTHD+N ≤ 1%

LS Mode, R_L= 8Ω

520mW (typ)

40mW (typ)

HP Mode, R_L= 32Ω

■ꢀOutput power at V_DD= 5V

ꢀꢀTHD+N ≤ 1%

LS Mode, R_L= 8Ω

HP Mode, R_L= 32Ω

■ꢀOutput Offset

ꢀꢀLS Mode 15

The LM49151 class D speaker amplifier features National’s

unique Automatic Level Control (ALC) that provides both a

I²C programmable no-clip feature with Clip Controls and

speaker protection. The E²S (Enhanced Emission Suppres-

sion) class D amplifier features a patented, ultra low EMI

PWM architecture that significantly reduces RF emissions

while preserving audio quality and efficiency while delivering

1.25W into an 8Ω load with <1% THD+N with a 5V supply.

The 42mW/channel headphone drivers feature National’s

ground referenced architecture that creates a ground-refer-

enced output from a single supply, eliminating the need for

bulky and expensive DC-blocking capacitors, saving space

and minimizing system cost.

1.25W (typ)

42mW (typ)

6mV (typ)

2mV (typ)

ꢀꢀHP Mode 15

Features

E²S class D amplifier

■

Ground referenced outputs — eliminates output coupling

capacitors

The LM49151 features separate volume controls for the loud-

speaker and headphone inputs. Mode selection, shutdown

control, and volume are controlled through an I²C compatible

interface. The LM49151's superior click and pop suppression

eliminates audible transients on power-up/down and during

shutdown.

■

I²C programmable No Clip Function with Clip Control

Voltage limiter speaker protection

I²C volume and mode Control

Ear Piece Amplifier

■

Notice: This document is not a full datasheet. For more

information regarding this product or to order samples

please contact your local National Semiconductor sales

office or visit http://www.national.com/support/dir.html

Advanced click-and-pop suppression

Low supply current

Micro-power shutdown

20-bump micro SMD package

Applications

Mobile Phones

■

PDAs

Notebook PCs

Portable Electronics Devices

MP3 Players

■

Boomer® is a registered trademark of National Semiconductor Corporation.

300925

www.national.com

12 3 4

中文翻译

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与LM49151相关器件

型号	品牌	获取价格	描述	数据表
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
LM49151TLX	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers,
LM49151TLX/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
LM49153	TI	获取价格	LM49153 Mono Audio Subsystem with Class G Headphone Amplifier, Class D SpeakerAmplifier, N
LM49153_15	TI	获取价格	Mono Audio Subsystem with Class G Headphone Amplifier, Class D Speaker Amplifier, Noise Ga
LM49153TM	TI	获取价格	LM49153 Mono Audio Subsystem with Class G Headphone Amplifier, Class D SpeakerAmplifier, N
LM49153TME/NOPB	TI	获取价格	Mono Audio Subsys w/ class G Headphone Amp Class D Speaker Amp Noise Gate & Speake
LM49153TMX	TI	获取价格	LM49153 Mono Audio Subsystem with Class G Headphone Amplifier, Class D SpeakerAmplifier, N
LM49153TMX/NOPB	TI	获取价格	Mono Audio Subsystem with Class G Headphone Amplifier, Class D Speaker Amplifier, Noise Ga

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