Features • 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 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 components required. Applications • Automotive radio/tape players • Compact portable tape players • Quality HI-FI tape systems • VCR playback noise reduction • Video disc playback noise reduction

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Datasheet

Title		Size	Date	Other Language
	LM1894 Dynamic Noise Reduction System DNR®	340 Kbytes	14-Oct-04	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-390: Application Note 390 DNR Applications of the LM1894	304 Kbytes	25-Sep-02
	AN-386: Application Note 386 A Non-Complementary Audio Noise Reduction System	376 Kbytes	23-Sep-02
	AN-384: Application Note 384 Audio Noise Reduction and Masking	163 Kbytes	23-Sep-02

More Application Notes

Title		Size	Date	Other Language
	AN-390: Application Note 390 DNR Applications of the LM1894	304 Kbytes	25-Sep-02
	AN-386: Application Note 386 A Non-Complementary Audio Noise Reduction System	376 Kbytes	23-Sep-02
	AN-384: Application Note 384 Audio Noise Reduction and Masking	163 Kbytes	23-Sep-02

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM1894M/NOPB RoHS	SOIC NARROW	Lifetime buy Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 88 DIGIKEY Worldwide 6541	$0.91 each at 1K+ pcs	rail of 55
LM1894MX/NOPB LM1894MX RoHS	SOIC NARROW	Full production Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$0.91 each at 1K+ pcs	reel of 2500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM1894M	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM1894MTBD	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM1894N	NONE	NONE	01 Dec 2004

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM1894M	SLM	0	44046	0	0	3532500	1	1002356520
LM1894MX	SLM	0	44046	0	0	3532500	1	1002356520

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM1894M	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM1894MTBD	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM1894N	NONE	NONE	01 Dec 2004