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LM4985TM

更新时间： 2024-09-21 04:20:07
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
29页 1486K
描述
Stereo 135mW Low Noise Headphone Amplifier with Selectable Capacitively Coupled or Output Capacitor-less (OCL) Output and Digitally Controlled (I2C) V

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LM4985TM 技术参数

是否Rohs认证： 符合生命周期：Transferred
包装说明：VFBGA, BGA12,3X4,16Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.33.00.01
风险等级：5.55商用集成电路类型：AUDIO AMPLIFIER
谐波失真：1%JESD-30 代码：R-XBGA-B12
JESD-609代码：e1长度：1.615 mm
湿度敏感等级：1信道数量：2
功能数量：1端子数量：12
最高工作温度：85 °C最低工作温度：-40 °C
标称输出功率：0.135 W封装主体材料：UNSPECIFIED
封装代码：VFBGA封装等效代码：BGA12,3X4,16
封装形状：RECTANGULAR封装形式：GRID ARRAY, VERY THIN PROFILE, FINE PITCH
峰值回流温度（摄氏度）：260电源：2.5/5 V
认证状态：Not Qualified座面最大高度：0.675 mm
子类别：Audio/Video Amplifiers最大压摆率：4.9 mA
最大供电电压 (Vsup)：5.5 V最小供电电压 (Vsup)：2.3 V
表面贴装：YES温度等级：INDUSTRIAL
端子面层：Tin/Silver/Copper (Sn/Ag/Cu)端子形式：BALL
端子节距：0.4 mm端子位置：BOTTOM
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：1.215 mm
Base Number Matches：1

LM4985TM 数据手册

 浏览型号LM4985TM的Datasheet PDF文件第2页浏览型号LM4985TM的Datasheet PDF文件第3页浏览型号LM4985TM的Datasheet PDF文件第4页浏览型号LM4985TM的Datasheet PDF文件第5页浏览型号LM4985TM的Datasheet PDF文件第6页浏览型号LM4985TM的Datasheet PDF文件第7页 
May 2006  
LM4985  
Stereo 135mW Low Noise Headphone Amplifier with  
Selectable Capacitively Coupled or Output  
Capacitor-less (OCL) Output and Digitally Controlled  
(I2C) Volume Control  
General Description  
Key Specifications (VDD = 3.6V)  
The LM4985 is a stereo audio power amplifier with internal  
digitally controlled volume control. This amplifier is capable  
of delivering 68mWRMS per channel into a 16Ω load or  
38mWRMS per channel into a 32Ω load at 1% THD when  
powered by a 3.6V power supply and operating in the OCL  
mode.  
j
PSRR: 217Hz and 1kHz  
Output Capacitor-less (OCL)  
f
f
RIPPLE = 217Hz  
77dB (typ)  
76dB (typ)  
RIPPLE = 1kHz  
Capacitor Coupled (C-CUPL)  
Boomer audio power amplifiers were designed specifically to  
provide high quality output power with a minimal amount of  
external components. To that end, the LM4985 features two  
functions that optimize system cost and minimize PCB area:  
an integrated, digitally controlled (I2C bus) volume control  
and an operational mode that eliminates output signal cou-  
pling capacitors (OCL mode). Since the LM4985 does not  
require bootstrap capacitors, snubber networks, or output  
coupling capacitors, it is optimally suited for low-power, bat-  
tery powered portable systems. For added design flexibility,  
the LM4985 can also be configured for single-ended capaci-  
tively coupled outputs.  
f
RIPPLE = 217Hz  
RIPPLE = 1kHz  
63dB (typ)  
62dB (typ)  
f
j
Output Power per channel  
(fIN = 1kHz, THD+N = 1%),  
RL = 16Ω,OCL  
VDD = 2.5V  
31mW (typ)  
68mW (typ)  
135mW (typ)  
VDD = 3.6V  
VDD = 5.0V  
j
j
THD+N (f = 1kHz)  
RLOAD = 16Ω, OCL, POUT = 60mW  
RLOAD = 32Ω, OCL, POUT = 33mW  
Shutdown Current  
0.60  
0.031  
The LM4985 features a current shutdown mode for mi-  
cropower dissipation and thermal shutdown protection.  
0.1µA (typ)  
Features  
n OCL or capacitively coupled outputs (patent pending)  
n I2C Digitally Controlled Volume Control  
n Available in space-saving 0.4mm lead-pitch micro SMD  
package  
n Volume control range: –76dB to +18dB  
n Ultra low current shutdown mode  
n 2.3V - 5.5V operation  
n Ultra low noise  
Applications  
n Mobile Phones  
n PDAs  
n Portable electronics devices  
n MP3 Players  
Boomer® is a registered trademark of National Semiconductor Corporation.  
© 2006 National Semiconductor Corporation  
DS201697  
www.national.com  
1234567...29

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