LM4912MM National Semiconductor, LM4912MM Datasheet

LM4912MM

Manufacturer Part Number

LM4912MM

Description

Stereo 40mW Low Noise Headphone Amplifier

Manufacturer

National Semiconductor

Datasheets

1.LM4912MM.pdf (14 pages)

2.LM4912MM.pdf (14 pages)

3.LM4912MM.pdf (14 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM4912MMX

Manufacturer:

NS/国半

Quantity:

20 000

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LM4912

Stereo 40mW Low Noise Headphone Amplifier

General Description

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.

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.

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.

The LM4912 is unity gain stable and may be configured with

external gain-setting resistors.

Typical Application

Boomer

is a registered trademark of National Semiconductor Corporation.

FIGURE 1. Typical Capacitive Coupled Output Configuration Circuit

DS200481

Key Specifications

n PSRR at 217 Hz and 1kHz

n Output Power at 1kHz with V

n Shutdown Current

n Output Voltage change on release from Shutdown

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

Features

n External gain-setting capability

n Available in space-saving MSOP package

n Ultra low current shutdown mode

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

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

a 16Ω load

16Ω load

1mV change on outputs

= 2.4V, R

= 16Ω

20048180

= 2.4V, 1% THD+N into

= 3V, 1% THD+N into a

www.national.com

1.0µA (max)

25mW (typ)

40mW (typ)

1mV (max)

65dB (typ)

10µV (typ)

July 2005

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