LM1112A
LM1112A is Dolby B-Type Noise Reduction Processor manufactured by National Semiconductor.
- Part of the LM1112 comparator family.
- Part of the LM1112 comparator family.
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 d B 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 ponents 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 d B refers to Dolby level which is 580 m Vrms 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 m A
Voltage Gain (Pin 5
- 3)
1 k Hz Pins 6 and 12 Connected
24 5 25 5 26 5 24 5 25 5 26 5 24 25 5 27 d B
(Pin 5
- 6)
1 k Hz Pin 6...
