LM1894N ,Dynamic Noise Reduction System DNRLM1894 Dynamic Noise Reduction System DNRDecember 1994LM1894®Dynamic Noise Reduction System DNRn Co ..
LM1894N. ,Dynamic Noise Reduction System DNRGeneral Descriptionn 10 dB effective tape noise reduction CCIR/ARMThe LM1894 is a stereo noise redu ..
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LM1897N ,18 V, 6 mA, low noise preamplifier for tape playback systemapplications
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LM4007 , SURFACE MOUNT SILICON RECTIFIERS
LM4007G , SURFACE MOUNT GLASS PASSIVATED SILICON RECTIFIERS
LM4040A10IDBZR ,10-V Precision Micropower Shunt Voltage Reference, 0.1% accuracy
LM4040A10IDBZT ,10-V Precision Micropower Shunt Voltage Reference, 0.1% accuracy
LM4040A10IDBZTG4 , PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE
LM4040A10IDCKR ,10-V Precision Micropower Shunt Voltage Reference, 0.1% accuracy
LM1894N-LM1894N.
Dynamic Noise Reduction System DNR
LM1894
Dynamic Noise Reduction System DNR®
General DescriptionThe LM1894isa stereo noise reduction circuitforuse with
audio playback systems. The DNR system is
non-complementary, meaningit doesnot require encoded
source material. The systemis compatible with virtuallyall
prerecorded tapes and FM broadcasts. Psychoacoustic
masking,andan adaptive bandwidth scheme allowthe DNR achieve10dBof noise reduction. DNRcan save circuit
board spaceand cost becauseofthefew additional compo-
nents required.
Features Non-complementary noise reduction, “single ended” Low cost external components,no critical matching Compatible withall prerecorded tapesandFM10dB effective tape noise reduction CCIR/ARM
weighted Wide supply range, 4.5Vto 18V1 Vrms input overload
Applications Automotive radio/tape players Compact portable tape players Quality HI-FI tape systems VCR playback noise reduction Video disc playback noise reduction
Typical ApplicationDNR®isa registeredtrademarkofNationalSemiconductor Corporation.
The DNR®systemis licensed toNationalSemiconductorCorporationunderU.S.patent 3,678,416and3,753,159.
Trademarkandlicense agreement requiredforuseofthis product.
DS007918-1
*R1+R2= 1kΩtotal.
See ApplicationHints.
Order Number LM1894Mor LM1894N
SeeNS Package Number M14Aor N14A
FIGURE1. Component Hook-Upfor Stereo DNR SystemDecember 1994
LM1894
Dynamic
Noise
Reduction
System
DNR©1999 National Semiconductor Corporation DS007918
