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LM1112B

National Semiconductor
Part Number LM1112B
Manufacturer National Semiconductor
Description Dolby B-Type Noise Reduction Processor
Published Jan 12, 2015
Detailed Description LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Processor LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Pro...
Datasheet PDF File LM1112B PDF File

LM1112B
LM1112B

Overview
LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Processor LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Processor April 1987 General Description The LM1112 is a monolithic integrated circuit specifically designed to realize the Dolby B-type noise reduction system It is a replacement for the LM1111 and the Signetics NE645 648 but with improved performance figures Features Y Very high signal noise ratio 74 dB encode (CCIR ARM) Y Wide supply voltage range 6V to 20V Y Very close matching to standard Dolby characteristics Y Audible switch-on transients greatly reduced Y Improved temperature performance Y Reduced number of precision external components Y Improved transient stability Y Input protection diodes Available only to licensees of Dolby Laboratories Licensing Corporation San Francisco from whom licensing and application information must be obtained Dolby and the double-D symbol are registered trademarks of Dolby Laboratories Licensing Corporation Schematic Diagram C1995 National Semiconductor Corporation TL H 7876 TL H 7876 – 1 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 24V Operating Temperature Range b20 C to a70 C Storage Temperature Range b65 C to a150 C Lead Temperature (Soldering 10 sec ) 260 C Electrical Characteristics VS e 12V TA e 25 C 0 dB refers to Dolby level which is 580 mVrms at pin 3 Parameter Conditions LM1112A Min Typ Max LM1112B Min Typ Max LM1112C Units Min Typ Max Supply Voltage Range 6 20 6 20 6 20 V Supply Current 15 20 15 20 15 20 mA Voltage Gain (Pin 5 – 3) 1 kHz Pins 6 and 12 Connected 24 5 25 5 26 5 24 5 25 5 26 5 24 25 5 27 dB (Pin 5 – 6) 1 kHz Pin 6 Open 14 7 14 7 14 7 dB (Pin 3 – 7) 1 kHz (Noise Reduction Out) b0 5 0 0 5 b0 5 0 0 5 b1 0 1 dB Distortion 1 kHz 0 dB 0 03 0 1 0 03 0 1 0 03 0 1 % ...


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