Part # LM1894 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM1894 Dynamic Noise Reduction System DNR®

Part Details:

LM1894 April 2002 Dynamic LM1894Dynamic Noise Reduction System DNR®General Description n Compatible with all prerecorded tapes and FM n 10 dB effective tape noise reduction CCIR/ARM The LM1894 is a stereo noise reduction circuit for use with Noise weighted audio playback systems. The DNR system is non- n Wide supply range, 4.5V to 18V complementary, meaning it does not require encoded sourcematerial. The system is compatible with virtually all prere- n 1 Vrms input overload corded tapes and FM broadcasts. Psychoacoustic masking, Reduction and an adaptive bandwidth scheme allow the DNR to Applications achieve 10 dB of noise reduction. DNR can save circuit n Automotive radio/tape players board space and cost because of the few additional compo- n Compact portable tape players nents required. n Quality HI-FI tape systems Features n VCR playback noise reduction n Video disc playback noise reduction n Non-complementary noise reduction, "single ended" System n Low cost external components, no critical matching Typical Application DNR 00791801 *R1 + R2 = 1 k total. See Application Hints. Order Number LM1894M, LM1894N, or LM1894MT See NS Package Number M14A, N14A, or MTC14 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. © 2004 National Semiconductor Corporation DS007918 Absolute Maximum Ratings (Note 1) Small Outline Package If Military/Aerospace specified devices are required, Vapor Phase (60 seconds) 215°C LM1894 please contact the National Semiconductor Sales Office/

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LM1894.pdf Datasheet