LM1894M

更新时间： 2024-02-27 16:22:08

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
10页	273K
描述
Dynamic Noise Reduction System DNR

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技术参数
数据手册

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LM1894M 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	DIP, DIP14,.3	Reach Compliance Code：	unknown
风险等级：	5.84	Is Samacsys：	N
商用集成电路类型：	CONSUMER CIRCUIT	JESD-30 代码：	R-PDIP-T14
湿度敏感等级：	1	端子数量：	14
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP14,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	认证状态：	Not Qualified
子类别：	Other Consumer ICs	表面贴装：	NO
技术：	BIPOLAR	温度等级：	COMMERCIAL
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	Base Number Matches：	1

LM1894M 数据手册

December 1994

LM1894

Dynamic Noise Reduction System DNR^®

n Compatible with all prerecorded tapes and FM

n 10 dB effective tape noise reduction CCIR/ARM

General Description

The LM1894 is a stereo noise reduction circuit for use with

audio playback systems. The DNR system is

non-complementary, meaning it does not require encoded

source material. The system is compatible with virtually all

prerecorded tapes and FM broadcasts. Psychoacoustic

masking, and an adaptive bandwidth scheme allow the DNR

to achieve 10 dB of noise reduction. DNR can save circuit

board space and cost because of the few additional compo-

nents required.

weighted

n Wide supply range, 4.5V to 18V

n 1 Vrms input overload

Applications

n Automotive radio/tape players

n Compact portable tape players

n Quality HI-FI tape systems

n VCR playback noise reduction

n Video disc playback noise reduction

Features

n Non-complementary noise reduction, “single ended”

n Low cost external components, no critical matching

Typical Application

DS007918-1

*R1 + R2 1 kΩ total.

See Application Hints.

Order Number LM1894M or LM1894N

See NS Package Number M14A or N14A

FIGURE 1. Component Hook-Up for Stereo DNR System

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

The DNR^®system is licensed to National Semiconductor Corporation under U.S. patent 3,678,416 and 3,753,159.

Trademark and license agreement required for use of this product.

DS007918

www.national.com

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