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LM4875

更新时间: 2024-11-05 11:11:47
品牌 Logo 应用领域
德州仪器 - TI 放大器音频放大器
页数 文件大小 规格书
26页 1724K
描述
具有精密直流音量控制和耳机放大器的 750mW、立体声、模拟输入、AB 类音频放大器

LM4875 数据手册

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LM4875  
www.ti.com  
SNAS042C JANUARY 2002REVISED MAY 2013  
LM4875  
750 mW Audio Power Amplifier with DC Volume  
Control and Headphone Switch  
Check for Samples: LM4875  
1
FEATURES  
DESCRIPTION  
The LM4875 is a mono bridged audio power amplifier  
with DC voltage volume control. The LM4875 is  
capable of delivering 750mW of continuous average  
power into an 8load with less than 1% THD when  
powered by a 5V power supply. Switching between  
bridged speaker mode and headphone (single ended)  
mode is accomplished using the headphone sense  
pin. To conserve power in portable applications, the  
LM4875's micropower shutdown mode (IQ = 0.7µA,  
typ) is activated when less than 300mV is applied to  
the DC Vol/SD pin.  
2
Precision DC Voltage Volume Control  
Headphone Amplifier Mode  
“Click and Pop” Suppression  
Shutdown Control When Volume Control Pin Is  
Low  
Thermal Shutdown Protection  
APPLICATIONS  
GSM Phones and Accessories, DECT, Office  
Phones  
Boomer audio power amplifiers are designed  
specifically to provide high power audio output while  
maintaining high fidelity. They require few external  
components and operate on low supply voltages.  
Hand Held Radio  
Other Portable Audio Devices  
KEY SPECIFICATIONS  
PO at 1.0% THD+N Into 8; 750 mW (typ)  
PO at 10% THD+N Into 8; 1 W (typ)  
Shutdown Current; 0.7µA(typ)  
Supply Voltage Range; 2.7V to 5.5 V  
TYPICAL APPLICATION  
CONNECTION DIAGRAM  
Small Outline Package (SOIC)  
Mini Small Outline Package (VSSOP)  
Top View  
See Package Number D, DGK  
Figure 1. Typical Audio Amplifier Application  
Circuit  
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.  
All trademarks are the property of their respective owners.  
2
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 © 2002–2013, Texas Instruments Incorporated  
 

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