LMV1090

更新时间： 2024-10-14 05:42:27

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
24页	729K
描述
Dual Input, Far Field Noise Suppression Microphone Amplifier

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LMV1090 数据手册

September 2, 2009

LMV1090

Dual Input, Far Field Noise Suppression Microphone

Amplifier

General Description

Key Specifications

The LMV1090 is a fully analog dual differential input, differ-

ential output, microphone array amplifier designed to reduce

background acoustic noise, while delivering superb speech

clarity in voice communication applications.

Far Field Noise Suppression Electrical *

34dB (typ)

26dB (typ)

■

SNRI_E

Supply current

Standby current

Signal-to-Noise Ratio (Voice band)

Total Harmonic Distortion + Noise

PSRR (217Hz)

■

600μA (typ)

0.1μA (typ)

65dB (typ)

0.1% (typ)

99dB (typ)

■

The LMV1090 preserves near-field voice signals within 4cm

of the microphones while rejecting far-field acoustic noise

greater than 50cm from the microphones. Up to 20dB of far-

field rejection is possible in a properly configured and using

±0.5dB matched microphones.

■

ꢀꢀ*FFNS_Eat f = 1kHz

Part of the Powerwise™ family of energy efficient solutions,

the LMV1090 consumes only 600μA of supply current pro-

viding superior performance over DSP solutions consuming

greater than ten times the power.

Features

No loss of voice intelligibility

■

No added processing delay

The dual microphone inputs and the processed signal output

are differential to provide excellent noise immunity. The mi-

crophones are biased with an internal low-noise bias supply.

Low power consumption

Differential outputs

Excellent RF immunity

Adjustable 12 - 54dB gain

Shutdown function

Space-saving 16–bump micro SMD package

■

Applications

Mobile headset

■

Mobile and handheld two-way radios

Bluetooth and other powered headsets

Hand-held voice microphones

Cell phones

■

System Diagram

30083340

300833

www.national.com

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