LM4985

更新时间： 2024-11-27 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

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

LM4985 数据手册

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 (V_DD= 3.6V)

The LM4985 is a stereo audio power amplifier with internal

digitally controlled volume control. This amplifier is capable

of delivering 68mW_RMSper channel into a 16Ω load or

38mW_RMSper channel into a 32Ω load at 1% THD when

mode.

PSRR: 217Hz and 1kHz

Output Capacitor-less (OCL)

_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.

_RIPPLE= 217Hz

_RIPPLE= 1kHz

63dB (typ)

62dB (typ)

Output Power per channel

(f_IN= 1kHz, THD+N = 1%),

R_L= 16Ω,OCL

V_DD= 2.5V

31mW (typ)

68mW (typ)

135mW (typ)

V_DD= 3.6V

V_DD= 5.0V

THD+N (f = 1kHz)

R_LOAD= 16Ω, OCL, P_OUT= 60mW

R_LOAD= 32Ω, OCL, P_OUT= 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.

DS201697

www.national.com

12 3 4 5 6 7...29

中文翻译

下载PDF

与LM4985相关器件

型号	品牌	获取价格	描述	数据表
LM4985TM	NSC	获取价格	Stereo 135mW Low Noise Headphone Amplifier with Selectable Capacitively Coupled or Output
LM4985TMX	NSC	获取价格	暂无描述
LM4990	NSC	获取价格	2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
LM4990	TI	获取价格	2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
LM4990_15	TI	获取价格	2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
LM4990ITL	NSC	获取价格	2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
LM4990ITL/NOPB	NSC	获取价格	IC 2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9, MICRO SMD-9, Audio/Video Amplifier
LM4990ITL/NOPB	TI	获取价格	2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
LM4990ITLX	NSC	获取价格	2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
LM4990ITLX/NOPB	TI	获取价格	2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level

与LM4985相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

47
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

35
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

64
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

61

产品中心

服务支持

精选活动

关于我们

帮助中心

LM4985

LM4985 数据手册

与LM4985相关器件

与LM4985相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

LM4985

LM4985 数据手册

与LM4985相关器件

与LM4985相关文章

您还可以找

您在本页遇到什么问题？