LMF380CIN

更新时间： 2024-02-03 00:02:26

品牌	Logo	应用领域
美国国家半导体 - NSC		有源滤波器开关
页数	文件大小	规格书
12页	234K
描述
LMF380 Triple One-Third Octave Switched-Capacitor Active Filter

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LMF380CIN 数据手册

November 1995

LMF380 Triple One-Third Octave

Switched-Capacitor Active Filter

General Description

The LMF380 is a triple, one-third octave filter set designed

for use in audio, audiological, and acoustical test and mea-

surement applications. Built using advanced switched-ca-

pacitor techniques, the LMF380 contains three filters, each

having a bandwidth equal to one-third of an octave in fre-

quency. By combining several LMF380s, each covering a

frequency range of one octave, a filter set can be imple-

mented that encompasses the entire audio frequency range

while using only a small fraction of the number of compo-

nents and circuit board area that would be required if a con-

ventional active filter approach were used. The center fre-

quency range is not limited to the audio band, however.

Center frequencies as low as 0.125 Hz or as high as 25 kHz

are attainable with the LMF380.

Accuracy is enhanced by close matching of the internal

components: the ratio of the clock frequency to the center

frequency is typically accurate to 0.5%, and passband

gain and stopband attenuation are guaranteed over the full

temperature range.

Features

Three bandpass filters with one-third octave center fre-

quency spacing

Choice of internal or external clock

No external components other than clock or crystal and

two capacitors

Key Specifications

The center frequency of each filter is determined by the

clock frequency. The clock signal can be supplied by an

external source, or it can be generated by the internal oscil-

lator, using an external crystal and two capacitors. Since the

Passband gain accuracy: Better than 0.7 dB over

temperature

Supply voltage range: 2V to 7.5V or 4V to 14V

LMF380 has an internal clock frequency divider ( 2) and

Applications

an output pin for the half-frequency clock signal, a single

clock oscillator for the top-octave LMF380 becomes the

master clock for the entire array of filters in a multiple

LMF380 application.

Real-Time Audio Analyzers (ANSI Type E, Class II)

Acoustical Instrumentation

Noise Testing

Simplified Block Diagram

TL/H/11123–1

1995 National Semiconductor Corporation

TL/H/11123

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7...12

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