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LM4985 PDF预览

LM4985

更新时间: 2024-01-06 12:11:07
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

LM4985 技术参数

是否Rohs认证: 符合生命周期:Obsolete
包装说明:FBGA, BGA12,3X4,16Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.33.00.01
Factory Lead Time:1 week风险等级:5.65
商用集成电路类型:AUDIO AMPLIFIERJESD-30 代码:R-PBGA-B12
JESD-609代码:e1湿度敏感等级:1
功能数量:3端子数量:12
最高工作温度:85 °C最低工作温度:-40 °C
封装主体材料:PLASTIC/EPOXY封装代码:FBGA
封装等效代码:BGA12,3X4,16封装形状:RECTANGULAR
封装形式:GRID ARRAY, FINE PITCH峰值回流温度(摄氏度):260
电源:2.5/5 V认证状态:Not Qualified
子类别:Audio/Video Amplifiers最大压摆率:4.9 mA
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

LM4985 数据手册

 浏览型号LM4985的Datasheet PDF文件第2页浏览型号LM4985的Datasheet PDF文件第3页浏览型号LM4985的Datasheet PDF文件第4页浏览型号LM4985的Datasheet PDF文件第5页浏览型号LM4985的Datasheet PDF文件第6页浏览型号LM4985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 16load or  
38mWRMS per channel into a 32load 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 = 16,OCL  
VDD = 2.5V  
31mW (typ)  
68mW (typ)  
135mW (typ)  
VDD = 3.6V  
VDD = 5.0V  
j
j
THD+N (f = 1kHz)  
RLOAD = 16, OCL, POUT = 60mW  
RLOAD = 32, 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  

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