Product details

Gain range (dB) Fixed -10dB gain Power supply (typ) (V) 4.5 to 18 Interface type Analog Operating temperature range (°C) 0 to 70 Rating Catalog
Gain range (dB) Fixed -10dB gain Power supply (typ) (V) 4.5 to 18 Interface type Analog Operating temperature range (°C) 0 to 70 Rating Catalog
SOIC (D) 14 51.9 mm² 8.65 x 6
  • Non-Complementary Noise Reduction, “Single Ended”
  • Low Cost External Components, No Critical Matching
  • Compatible with All Prerecorded Tapes and FM
  • 10 dB Effective Tape Noise Reduction CCIR/ARM Weighted
  • Wide Supply Range, 4.5V to 18V
  • 1 Vrms Input Overload

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  • Non-Complementary Noise Reduction, “Single Ended”
  • Low Cost External Components, No Critical Matching
  • Compatible with All Prerecorded Tapes and FM
  • 10 dB Effective Tape Noise Reduction CCIR/ARM Weighted
  • Wide Supply Range, 4.5V to 18V
  • 1 Vrms Input Overload

All trademarks are the property of their respective owners.

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 components required.

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 components required.

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Type Title Date
* Data sheet LM1894 Dynamic Noise Reduction System DNR datasheet (Rev. C) 03 Apr 2013
Application note AN-386 A Non-Complementary Audio Noise Reduction System (Rev. C) 01 May 2013
Application note AN-390 DNR Applications of the LM1894 (Rev. C) 01 May 2013

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