Datasheet > LM4912

LM4912

更新时间： 2024-01-21 11:59:19

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
14页	696K
描述
Stereo 40mW Low Noise Headphone Amplifier

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LM4912 数据手册

June 2003

LM4912

Stereo 40mW Low Noise Headphone Amplifier

General Description

Key Specifications

n PSRR at 217 Hz and 1kHz

65dB (typ)

The LM4912 is an stereo audio power amplifier capable of

delivering 40mW per channel of continuous average power

into a 16Ω load or 25mW per channel into a 32Ω load at 1%

THD form a 3V power supply.

n Output Power at 1kHz with V_DD= 2.4V, 1% THD+N into

a 16Ω load 25mW (typ)

n Output Power at 1kHz with V_DD= 3V, 1% THD+N into a

16Ω load

n Shutdown Current

n Output Voltage change on release from Shutdown

V_DD= 2.4V, R_L= 16Ω

n Output Noise, 20Hz to 20kHz, A-weighted

40mW (typ)

1.0µA (max)

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. Since the LM4912 does not require

bootstrap capacitors or snubber networks, it is optimally

suited for low-power portable systems.

1mV (max)

10µV (typ)

The LM4912 features a low-power consumption shutdown

mode and a power mute mode that allows for faster turn on

time with less than 1mV voltage change at outputs on re-

lease. Additionally, the LM4912 features an internal thermal

shutdown protection mechanism.

Features

n External gain-setting capability

n Available in space-saving MSOP package

n Ultra low current shutdown mode

The LM4912 is unity gain stable and may be configured with

external gain-setting resistors.

n Mute mode allows fast turn-on (10ms) with less than

1mV change on outputs

n 2.0V - 5.5V operation

n Ultra low noise

n Operation at low supply voltages

Applications

n Portable CD players

n PDAs

n Portable electronics devices

Typical Application

20048180

FIGURE 1. Typical Capacitive Coupled Output Configuration Circuit

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

DS200481

www.national.com

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