Datasheet > LM49450SQ

LM49450SQ

更新时间： 2024-11-21 20:01:39

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器商用集成电路
页数	文件大小	规格书
38页	834K
描述
IC 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC32, 5 X 5 MM, 0.80 MM HEIGHT, LLP-32, Audio/Video Amplifier

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LM49450SQ 技术参数

是否Rohs认证：	不符合	生命周期：	Transferred
包装说明：	5 X 5 MM, 0.80 MM HEIGHT, LLP-32	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
风险等级：	5.21	商用集成电路类型：	AUDIO AMPLIFIER
JESD-30 代码：	S-XQCC-N32	JESD-609代码：	e0
长度：	5 mm	湿度敏感等级：	1
信道数量：	2	功能数量：	1
端子数量：	32	最高工作温度：	85 °C
最低工作温度：	-40 °C	标称输出功率：	1.2 W
封装主体材料：	UNSPECIFIED	封装代码：	HVQCCN
封装等效代码：	LCC28,.2SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	电源：	3.6/5 V
认证状态：	Not Qualified	筛选级别：	AEC-Q100
座面最大高度：	0.8 mm	子类别：	Audio/Video Amplifiers
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	2.7 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn85Pb15)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	QUAD
宽度：	5 mm	Base Number Matches：	1

LM49450SQ 数据手册

September 26, 2008

LM49450ꢀ

I²S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio

Sub-System with Ground Referenced Headphone

Amplifier, 3D Enhancement, and Headphone Sense

■ꢀOutput Power/Channel

ꢀSpeaker at LSV_DD= 5V:

R_L= 4Ω, THD+N ≤ 10%

R_L= 8Ω, THD+N ≤ 1%

General Description

The LM49450 is a fully integrated audio subsystem designed

for portable media player applications. The LM49450 com-

bines a 24-bit I²S digital-to-analog converter (DAC), 2.5W/

channel stereo Class D speaker drivers, 36mW stereo ground

referenced headphone drivers, volume control, and

National’s unique 3D sound enhancement into a single de-

vice.

2.5W (typ)

1.25W (typ)

ꢀHeadphone at HPV_DD= 2.5V:

R_L= 16Ω, THD+N ≤ 1%

R_L= 32Ω, THD+N ≤ 1%

34mW (typ)

36mW (typ)

The filterless Class D amplifiers deliver 1.25W/channel into

an 8Ω load with <1% THD+N with a 5V supply. The LM49450

offers two logic selectable modulation schemes, fixed fre-

quency mode, and an EMI reducing spread spectrum mode.

The 36mW/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. A headphone sense input (HPS)

automatically detects the presence of a headphone, and con-

figures the device accordingly.

■ꢀPSRR at 1kHz

67dB ( typ)

77dB (typ)

Speaker Mode

Headphone Mode

0.02μA (typ)

■ꢀShutdown current

Features

24–Bit Stereo DAC

■

Stereo Filterless Class D Operation

The LM49450 stereo, 24-bit DAC supports a wide range of

sample rates (including 192kHz, 96kHz, 48kHz, and

44.1kHz). The digital audio signal path features better than

100dB SNR, and low 0.05% THD+N when measured at the

headphone outputs. The flexible 3-wire I²S interface supports

left or right justified audio data.

Selectable spread spectrum mode reduces EMI

Ground Referenced Headphone Amplifiers with 100dB

SNR

I²S Compatible Audio Interface

Audio Sample Rates up to 192kHz

National’s 3D Enhancement

32-step Digital Volume Control

I²C Compatible Control Interface

Headphone Sense Input

■

The LM49450 features separate 32-step volume control for

the headphones and speaker outputs. 3D enhancement,

mode selection, shutdown control, and volume are controlled

through an I²C compatible interface.

Output short circuit and thermal overload protection prevent

the device from being damaged during fault conditions. Su-

perior click and pop suppression eliminates audible transients

on power-up/down and during shutdown. The LM49450 is

available in a space saving 32-pin LLP package.

Stereo Analog Line Inputs

Output Short Circuit Protection

Thermal Overload Protection

Minimum external components

Click and Pop suppression

Key Specifications

Micro-power shutdown

■ꢀSNR at Headphone Output

■ꢀSpeaker Amplifier Efficiency

at 3.6V, 650mW/channel into 8Ω

102dBA (typ)

87% (typ)

Available in space-saving 32 pin LLP package

Applications

Portable Media Players

■ꢀSpeaker Amplifier Efficiency

at 5V, 1.1W/channel into 8Ω

■

80% (typ)

Portable Navigation Devices

Multi-Media Monitors

■ꢀQuiescent Power Supply Current

Line Inputs:

Laptops

Portable Gaming Devices

ꢀSpeaker Mode at LSV_DD= 3.6V

7.5mA (typ)

5.3mA (typ)

Mobile Handsets

ꢀHeadphone Mode at HPV_DD= 2.5V

Boomer® is a registered trademark of National Semiconductor Corporation.

300455

www.national.com

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LM49450SQ 替代型号

型号	品牌	替代类型	描述	数据表
LM49450SQ/NOPB	TI	功能相似	Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Ref

与LM49450SQ相关器件

型号	品牌	获取价格	描述	数据表
LM49450SQ/NOPB	TI	获取价格	Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Ref
LM49450SQX	TI	获取价格	IC,AUDIO AMPLIFIER,DUAL,LLCC,28PIN,PLASTIC
LM49450SQX/NOPB	TI	获取价格	Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Ref
LM4946	NSC	获取价格	Output Capacitor-Less Audio Subsystem with Programmable National 3D
LM4946_07	NSC	获取价格	Output Capacitor-Less Audio Subsystem with Programmable National 3D
LM4946SQ	NSC	获取价格	Output Capacitor-Less Audio Subsystem with Programmable National 3D
LM4946SQX	NSC	获取价格	IC 1.3 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC24, LLP-24, Audio/Video Amplifier
LM4946SQX/NOPB	TI	获取价格	IC,AUDIO AMPLIFIER,TRIPLE,LLCC,24PIN,PLASTIC
LM4946TM	NSC	获取价格	Output Capacitor-Less Audio Subsystem with Programmable National 3D
LM4946TM/NOPB	NSC	获取价格	IC 1.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA25, ROHS COMPLIANT, MICRO, BUMP, SMD-25, Audio/V

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