LM4874MH datasheet(1/21 Pages) NSC

부품명	LM4874MH

상세설명	2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown

PDF	21 Pages

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제조업체	NSC [National Semiconductor (TI)]

홈페이지	http://www.national.com

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LM4874

2.1W Differential Input, BTL Output Stereo Audio

Amplifier with Selectable Gain and Shutdown

General Description

The LM4874 features differential stereo inputs, BTL (bridge-

tied load) outputs, and four externally selectable fixed gains.

Operating on a single 5V supply, the LM4874 delivers 1.2W,

1.9W, or 2.1W (typ) of output power to an 8

Ω,4Ω,or3Ω BTL

load (Note 1), respectively, with less than 1% THD+N. The

LM4874’s gain is selected using two digital inputs. The nomi-

nal gain values are 6dB, 10dB, 15.6dB, and 21.6dB.

The LM4874 is designed for notebook and other handheld

portable applications. It delivers high quality output power

from a surface-mount package and requires few external

components.

Other features include an active-low micropower shutdown

mode input and thermal shutdown protection.

Key Specifications

j BTL output power

R

L =3

Ω,V

DD = 5.0V, and THD+N = 1%

2.1W (typ)

j BTL output power

R

L =4

Ω,V

DD = 5.0V, and THD+N = 1%

1.9W (typ)

j BTL output power

R

L =8

Ω,V

DD = 5.0V, and THD+N = 1%

1.2W (typ)

j Micropower shutdown current

0.1µA (typ)

j PSRR (@ 1kHz, VDD = 5V, (Fig.1))

62dB (typ)

Features

n

Fully differential input and output

n

Internal gain set: 6dB, 10dB, 15.6dB, and 21.6dB

n

Improved ’click and pop’ suppression

n

Thermal shutdown protection circuit

n

Ultra low current micropower shutdown mode

n

3.0V to 5.5V operation

n

Available in space-saving exposed-DAP TSSOP

package

Applications

n

Notebook computers

n

PDAs

n

Portable electronic devices

Connection Diagram

Top View

20046902

Order Number LM4874MH

See NS Package Number MXA20A for Exposed-DAP TSSOP

Boomer® is a registered trademark of National Semiconductor Corporation.

August 2002

DS200469

www.national.com

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National Semiconductor ...	LM4869	832Kb / 20P	1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown
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