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LM49450_15

更新时间： 2024-11-22 01:15:11
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
42页 1037K
描述
Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Referenced Headphone Amplifier, 3D Enhancement, and Headphone Sense

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LM49450_15 数据手册

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LM49450  
www.ti.com  
SNAS440D –FEBRUARY 2008–REVISED MAY 2013  
LM49450 Boomer ™ I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-  
System with Ground Referenced Headphone Amplifier, 3D Enhancement, and Headphone  
Sense  
Check for Samples: LM49450  
1
FEATURES  
KEY SPECIFICATIONS  
23  
•
24–Bit Stereo DAC  
•
•
SNR at Headphone Output: 102dBA (typ)  
•
•
Stereo Filterless Class D Operation  
Speaker Amplifier Efficiency at 3.6V,  
650mW/Channel into 8Ω: 87% (typ)  
Selectable Spread Spectrum Mode Reduces  
EMI  
•
•
Speaker Amplifier Efficiency at 5V,  
1.1W/Channel into 8Ω: 80% (typ)  
•
Ground Referenced Headphone Amplifiers  
with 100dB SNR  
Quiescent Power Supply Current Line Inputs:  
•
•
•
•
•
•
•
•
•
•
•
•
•
I2S Compatible Audio Interface  
Audio Sample Rates up to 192kHz  
TI’s 3D Enhancement  
–
Speaker Mode at LSVDD = 3.6V: 7.5mA  
(typ)  
–
Headphone Mode at HPVDD = 2.5V: 5.3mA  
(typ)  
32-Step Digital Volume Control  
I2C-Compatible Control Interface  
Headphone Sense Input  
•
•
•
•
Output Power/Channel Speaker at LSVDD = 5V:  
–
–
RL = 4Ω, THD+N ≤ 10%: 2.5W (typ)  
RL = 8Ω, THD+N ≤ 1%: 1.25W (typ)  
Stereo Analog Line Inputs  
Output Short Circuit Protection  
Thermal Overload Protection  
Minimum External Components  
Click and Pop Suppression  
Micro-Power Shutdown  
Headphone at HPVDD = 2.5V:  
–
–
RL = 16Ω, THD+N ≤ 1%: 34mW (typ)  
RL = 32Ω, THD+N ≤ 1%: 36mW (typ)  
PSRR at 1kHz  
–
–
Speaker Mode: 67dB ( typ)  
Headphone Mode: 77dB (typ)  
Available in Space-Saving 32-Pin WQFN  
Package  
Shutdown current: 0.02μA (typ)  
DESCRIPTION  
APPLICATIONS  
The LM49450 is a fully integrated audio subsystem  
designed for portable media player applications. The  
LM49450 combines a 24-bit I2S digital-to-analog  
•
•
•
•
•
•
Portable Media Players  
Portable Navigation Devices  
Multi-Media Monitors  
Laptops  
converter (DAC), 2.5W/channel stereo Class  
D
speaker drivers, 36mW stereo ground referenced  
headphone drivers, volume control, and TI’s unique  
3D sound enhancement into a single device.  
Portable Gaming Devices  
Mobile Handsets  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
3
is a trademark of ~ Texas Instruments.  
All other trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2008–2013, Texas Instruments Incorporated  
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