LMF90CCN

更新时间： 2024-11-06 22:30:15

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
22页	412K
描述
4th-Order Elliptic Notch Filter

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数据手册

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LMF90CCN 数据手册

December 1994

LMF90

4th-Order Elliptic Notch Filter

No external components needed to set response char-

acteristics

General Description

The LMF90 is a fourth-order elliptic notch (band-reject) filter

based on switched-capacitor techniques. No external com-

ponents are needed to define the response function. The

depth of the notch is set using a two-level logic input, and

the width is programmed using a three-level logic input. Two

different notch depths and three different ratios of notch

width to center frequency may be programmed by connect-

ing these pins to V^a, ground, or V^b. Another three-level

logic pin sets the ratio of clock frequency to notch frequen-

cy.

Notch width, attenuation, and clock-to-center-frequency

ratio independently programmable

14 pin 0.3 wide package

Key Specifications

Range

0.1 Hz to 30 kHz

accuracy over full temperature range (max) 1.5%

2V to 7.5V or 4V to 15V

Supply voltage range

Passband Ripple (typ)

0.25 dB

An internal crystal oscillator is provided. Used in conjunction

with a low-cost color TV crystal and the internal clock fre-

quency divider, a notch filter can be built with center fre-

quency at 50 Hz, 60 Hz, 100 Hz, 120 Hz, 150 Hz, or 180 Hz

for rejection of power line interference. Several LMF90s can

be operated from a single crystal. An additional input is pro-

vided for an externally-generated clock signal.

Attenuation at f (typ)

39 dB or 48 dB (selectable)

100:1, 50:1, or 33.3:1

f : f

CLK

Notch Bandwidth (typ)

0.127 f , 0.26 f , or 0.55 f

0 0

Output offset voltage (max)

120 mV

Applications

Automatic test equipment

Communications

Features

Power line interference rejection

Center frequency set by external clock or on-board

clock oscillator

Typical Connection

Connection

Diagram

60 Hz Notch Filter

Dual-In-Line and Small

Outline Packages

TL/H/10354–2

Top View

Order Number LMF90CCN,

LMF90CIWM,

LMF90CCWM, LMF90CIJ,

LMF90CCJ, LMF90CIN,

LMF90CMJ or

LMF90CMJ/883

See NS Package Number

J14A, M14B or N14A

TL/H/10354–1

1995 National Semiconductor Corporation

TL/H/10354

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

12 3 4 5 6 7...22

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