Dolby B-Type Noise Reduction Processor
LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Processor
LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Pro...
Description
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 Dolb...
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