LM4875

更新时间： 2024-11-03 22:51:39

品牌	Logo	应用领域
美国国家半导体 - NSC		开关放大器功率放大器
页数	文件大小	规格书
13页	670K
描述
750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch

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LM4875 数据手册

January 2002

LM4875

750 mW Audio Power Amplifier with DC Volume Control

and Headphone Switch

General Description

Applications

n GSM phones and accessories, DECT, office phones

n Hand held radio

The LM4875 is a mono bridged audio power amplifier with

DC voltage volume control. The LM4875 is capable of deliv-

ering 750mW of continuous average power into an 8Ω load

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 (I_Q= 0.7µA, typ) is

activated when less than 300mV is applied to the DC Vol/SD

pin.

n Other portable audio devices

Key Specifications

P_Oat 1.0% THD+N into 8Ω

P_Oat 10% THD+N into 8Ω

Shutdown current

750mW (typ)

1W (typ)

0.7µA(typ)

Supply voltage range

2.7V to 5.5V

Boomer audio power amplifiers are designed specifically to

provide high power audio output while maintaining high fidel-

ity. They require few external components and operate on

low supply voltages.

Features

n Precision DC voltage volume control

n Headphone amplifier mode

n “Click and pop” suppression

n Shutdown control when volume control pin is low

n Thermal shutdown protection

Typical Application

Connection Diagram

Small Outline Package (SO)

Mini Small Outline Package (MSOP)

10104202

Top View

Order Number LM4875M, LM4875MM

See NS Package Number M08A, MUA08A

10104201

FIGURE 1. Typical Audio Amplifier

Application Circuit

™

BOOMER is a trademark of National Semiconductor Corporation.

DS101042

www.national.com

12 3 4 5 6 7...13

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与LM4875相关器件

型号	品牌	获取价格	描述	数据表
LM4875M	NSC	获取价格	750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch
LM4875M/NOPB	NSC	获取价格	IC 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO8, SOIC-8, Audio Control IC
LM4875M/NOPB	TI	获取价格	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 \|
LM4875MM	NSC	获取价格	750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch
LM4875MM/NOPB	NSC	获取价格	IC 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO8, 0.118 INCH, MSOP-8, Audio Control IC
LM4875MM/NOPB	TI	获取价格	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 \|
LM4875MX/NOPB	NSC	获取价格	IC 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO8, SOIC-8, Audio Control IC
LM4875MX/NOPB	TI	获取价格	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 \|
LM4876	TI	获取价格	LM4876 1.1W Audio Power Amplifier with Logic Low
LM4876	NSC	获取价格	1.1W Audio Power Amplifier with Shutdown Logic Low