LM1894 Datasheet | National Semiconductor

Description The LM1894 is a stereo noise reduction circuit for use with audio playback systems. The DNR system is non-plementary, meaning it does not require encoded source material. The system is patible with virtually all prerecorded tapes and FM broadcasts. Psychoacoustic masking, and an adaptive bandwidth scheme allow the DNR to achieve 10 d B of noise reduction. DNR can save circuit board space and cost because of the few additional ponents required. n patible with all prerecorded tapes and FM n 10 d B effective tape noise reduction CCIR/ARM weighted n Wide supply range, 4.5V to 18V n 1 Vrms input overload Applications n n n n n Automotive radio/tape players pact portable tape players Quality HI-FI tape systems VCR playback noise reduction Video disc playback noise reduction Features n Non-plementary noise reduction, “single ended” n Low cost external ponents, 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. ponent 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. © 1999 National Semiconductor Corporation DS007918 .national. Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Input Voltage Range, Vpk Operating Temperature (Note 2) Storage Temperature Soldering Information Dual-In-Line Package Soldering (10 seconds) 20V VS/2 0˚C to +70˚C - 65˚C to +150˚C Small Outline Package Vapor Phase (60 seconds) 215˚C Infrared (15 seconds) 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface...