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PDF LM1112A Data sheet ( Hoja de datos )

Número de pieza LM1112A
Descripción Dolby B-Type Noise Reduction Processor
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LM1112A Hoja de datos, Descripción, Manual

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 sys-
tem
It is a replacement for the LM1111 and the Signetics NE-
645 648 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

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LM1112A pdf
ELECTRICAL NOISE REDUCTION SWITCH
In place of the normal mechanical noise reduction on off
switch the circuit below is often used to permit electrical NR
control When using this circuit the following points should
be noted
1 Signal boost is reduced by increasing DC voltage on Pin
14 (see curve) A voltage of approximately 3V is adequate
to achieve NR OFF
2 Supply current may be significantly increased by high pin
14 forced voltages Values for V and R should thus be
chosen such that pin 14 voltage is 3V – 4V
3 When electrical NR switching is used signal level is
slightly affected by the minimum value of the internal vari-
able impedance (At 10 kHz – 10 dB a residual boost of
approximately 0 4 dB remains ) This is not the case for
mechanical NR switching
Note 1 Where not otherwise specified component tolerances are g10%
TL H 7876 – 10
Signal Boost vs Pin 14 Control Voltage
(Encode 10 kHz)
Supply Current vs Pin 14 Control Voltage
(VS e 12V) (Encode 10 kHz)
TL H 7876 – 11
5

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