LM4931

更新时间： 2024-11-20 23:16:47

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
47页	1631K
描述
Audio Subsystem with Mono High Efficiency Loudspeaker and Stereo Headphone Amplifiers

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LM4931 数据手册

June 2004

LM4931

Audio Subsystem with Mono High Efficiency

Loudspeaker and Stereo Headphone Amplifiers

General Description

Key Specifications

The LM4931 is an integrated audio subsystem that supports

voice and digital audio functions. The LM4931 includes a

high quality stereo DAC, voice band codec, a stereo head-

phone amplifier and a high-power high efficiency mono

speaker amplifier. It is primarily designed for demanding

applications in mobile phones and other portable devices.

P_{LS OUT}at AV_DD= 5V, 8Ω

1% THD+N

1.1W (typ)

P_{LS OUT}at AV_DD= 3.3V, 8Ω

1% THD+N

570mW (typ)

P_{H/P OUT}at AV_DD= 5V & AV_DD= 3.3V, 32Ω

The LM4931 features an I²S serial interface for full range

audio, a 16-bit PCM bi-directional serial interface for the

voice band codec and an I²C/SPI compatible interface for

control. The full range music path features an SNR of 86dB

with an 18-bit 48kHz input. The headphone amplifier delivers

at least 26mW_RMSto a 32Ω single-ended stereo load with

less than 1% distortion (THD+N) when AV_DD= 3.3V_DC. The

mono speaker amplifier delivers up to 570mW_RMSinto an 8Ω

1% THD+N

26mW (typ)

Supply voltage range

DV_DD

2.7V to 4.0V

2.7V to 5.0V

1.1µA (typ)

62dB (typ)

75dB (typ)

86dB (typ)

AV_DD(Note 8)

Shutdown current

PSRR at 217Hz, AV_DD= 3V

SNR (Voice Codec)

SNR (Audio DAC)

load with less than 1% distortion when AV_DD= 3.3V_DC

The LM4931 employs advanced techniques to reduce power

consumption, to reduce controller overhead, and to eliminate

click and pop. Boomer audio power amplifiers were de-

signed specifically to provide high quality output power with

a minimal amount of external components. It is therefore

ideally suited for mobile phone and other low voltage appli-

cations where minimal power consumption, PCB area, and

cost are primary requirements.

Features

n 18-bit 44.1kHz or 48kHz stereo DAC

n 16-bit 8kHz , 12kHz , 16kHz, or 24kHz voice-band

codec

n PLL for operation from common system clocks

n Either I²C or SPI compatible serial interface

n I²S digital audio data serial interface

n PCM voice audio data serial interface

n Differential analog microphone input

n 26mW/channel stereo headphone amplifier

n 570mW mono high efficiency BTL 8Ω amplifier

n 32-step volume control for audio output amplifiers with

1.5dB step size.

n Unity-gain stable headphone amplifiers

n No snubber networks or bootstrap capacitors are

required by the headphone or hands-free amplifiers

n Adjustable digital side-tone attenuation

n 16-step volume control for microphone preamp with 2dB

step size

n Configurable GPIO/Status Port

n Available in the 42 bump micro-SMD package

Applications

n 2.5 and 3G Mobile Phones and Multimedia Terminals

n PDAs, Internet Appliances and Portable Gaming

n Portable DVD/CD/AAC/MP3 Players

n Digital Cameras and Toys

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

DS201009

www.national.com

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与LM4931相关器件

型号	品牌	获取价格	描述	数据表
LM4931_06	NSC	获取价格	Audio Subsystem with Mono High Efficiency Loudsperker and Stereo Headphone Amplifiers
LM4931ITL/NOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PBGA42, MICRO, SMD-42, Consumer IC:Other
LM4931ITLX/NOPB	NSC	获取价格	IC,AUDIO AMPLIFIER,SINGLE,BGA,42PIN,PLASTIC
LM49321	NSC	获取价格	Audio Sub-System with Stereo DAC, Mono Class AB Loudspeaker Amplifier, OCL/SE Stereo Headp
LM49321RL	NSC	获取价格	Audio Sub-System with Stereo DAC, Mono Class AB Loudspeaker Amplifier, OCL/SE Stereo Headp
LM49321RLX/NOPB	TI	获取价格	Audio Sub-Sys w/ Stereo DAC Mono Class AB Loudspkr Amp OCL/SE Stereo Headph Output &am
LM4934	NSC	获取价格	3D Audio Sub-System with Stereo Speaker, OCL/SE Stereo Headphone, Earpiece and Mono Line L
LM4934_06	NSC	获取价格	3D Audio Sub-System with Stereo Speaker, OCL/SE Stereo Headphone, Earpiece and Mono Line L
LM4934RL	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PBGA42, MICRO, BGA-42, Consumer IC:Other
LM4934RLX/NOPB	TI	获取价格	SPECIALTY CONSUMER CIRCUIT, PBGA42, GREEN, DSBGA-42

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