Datasheet > LM4981SQ

LM4981SQ

更新时间： 2024-09-20 22:41:03

品牌	Logo	应用领域
美国国家半导体 - NSC		商用集成电路放大器
页数	文件大小	规格书
18页	1190K
描述
Ground-Referenced, 80mW Stereo Headphone Amplifier with Digital Volume Control

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LM4981SQ 数据手册

November 2005

LM4981

Ground-Referenced, 80mW Stereo Headphone Amplifier

with Digital Volume Control

General Description

Key Specifications

The LM4981 is

a stereo, ground-referenced, output

Improved PSRR at 217Hz

THD+N at 1kHz, 50mW

into 32Ω SE (3V)

67dB (typ)

capacitor-less headphone amplifier capable of delivering

83mW of continuous average power into a 16Ω load with

less than 1% THD+N while operating from a single 3V

supply.

1.0% (typ)

2.0 to 4.2V

Single Supply Operation (V_DD

Power Output at VDD = 3V,

RL = 16Ω, THD ≤ 1%

Shutdown Current

)

The LM4981 features a new circuit technology that utilizes a

charge pump to generate a negative reference voltage. This

allows the outputs to be biased about ground, thereby elimi-

nating output-coupling capacitors typically used with normal

single-ended loads.

83mW (typ)

0.01µA (typ)

The LM4981 provides high quality audio reproduction with

minimal external components. A ground referenced output

eliminates the output coupling capacitors typically required

to drive single-ended loads such as headphones. The

ground reference architecture reduces components count,

cost and board space consumption, making the LM4981

ideal for handheld MP3 players, mobile phones and other

portable equipment where board space is at a premium.

Eliminating the output capacitors also improves low fre-

quency response.

Features

n Ground Referenced Outputs

n No Output Coupling Capacitors

n 16-Step Volume Control

n Auto-Standby Mode

n High PSRR

n Available in Space Saving LLP package

n Low Power Shutdown Mode

n Improved Click and Pop Suppression Eliminates Noises

During Turn-on and Turn-off Transients

n 2.0V to 4.2V Operation

The LM4981 operates from a single 2.0V – 4.2V supply, and

features a 2-wire, up/down volume control that sets the gain

of the amplifier between -33dB to +12dB in 16 discrete

steps. Selectable (active high/low) low power shutdown

mode provides flexible shutdown control. Superior click and

pop suppression eliminates audible transients during

start-up and shutdown.

n 83mW Per Channel Into 16Ω

n Selectable Shutdown Controls (Active High/Low)

Applications

n Portable MP3 Players

n Mobile Phones

n PDAs

The LM4981 features an Automatic Standby Mode circuitry

(patent pending). In the absence of an input signal, after

approximately 12 seconds, the LM4981 goes into low cur-

rent standby mode. The LM4981 recovers into full power

operating mode immediately after a signal is applied to either

the left or right input pins. This feature saves power supply

current in battery operated applications.

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS201473

www.national.com

12 3 4 5 6 7...18

中文翻译

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与LM4981SQ相关器件

型号	品牌	获取价格	描述	数据表
LM4982	NSC	获取价格	Ground-Referenced, Ultra Low Noise, 80mW Stereo Headphone Amplifier with IntelliSense and
LM4982TL	NSC	获取价格	Ground-Referenced, Ultra Low Noise, 80mW Stereo Headphone Amplifier with IntelliSense and
LM4982TLX/NOPB	TI	获取价格	AUDIO AMPLIFIER
LM4985	NSC	获取价格	Stereo 135mW Low Noise Headphone Amplifier with Selectable Capacitively Coupled or Output
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

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