Reduction Processor. LM1112 Datasheet

LM1112 Processor. Datasheet pdf. Equivalent

Part LM1112
Description Dolby B-Type Noise Reduction Processor
Feature LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Processor LM1112A LM1112B LM1112C Dolby B-Type.
Manufacture National Semiconductor
Datasheet
Download LM1112 Datasheet

LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Process LM1112 Datasheet
LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Process LM1112A Datasheet
LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Process LM1112B Datasheet
LM1112A LM1112B LM1112C Dolby B-Type Noise Reduction Process LM1112C Datasheet
Recommendation Recommendation Datasheet LM1112 Datasheet





LM1112
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



LM1112
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 %
10 kHz a10 dB
02
02
02 %
Signal Handling
1 kHz 0 3% Distortion
Signal Noise Ratio
at Pin 7 (Note 1)
VS e 6V
VS e 12V
VS e 18V
Pins 6 and 2
Connected
85
13 15 5
19
85
13 15 5
19
85
13 15 5
19
dB
dB
dB
Encode Mode
(CCIR ARM)
NR In
NR Out
Decode Mode
(CCIR ARM)
RS e 10k
RS e 1k
RS e 10k
RS e 10k
71 5 74
77
83
83
71 74
77
83
83
70 74
77
83
83
dB
dB
dB
dB
Encode Characteristics Input to Pin 5
10 kHz 0 dB
0 0 5 1 0 b0 2 0 5 1 2 b0 5 0 5 1 5 dB
1 3 kHz b20 dB
b16 2 b15 7 b15 2 b16 7 b15 7 b14 7 b17 2 b15 7 b14 2 dB
5 kHz b20 dB
b17 3 b16 8 b16 3 b17 8 b16 8 b15 8 b18 3 b16 8 b15 3 dB
3 kHz b30 dB
b21 7 b21 2 b20 7 b22 2 b21 2 b20 2 b22 7 b21 2 b19 7 dB
5 kHz b30 dB
b22 3 b21 8 b21 3 b22 8 b21 8 b20 8 b23 3 b21 8 b20 3 dB
10 kHz b30 dB
b24 0 b23 5 b23 0 b24 5 b23 5 b22 5 b25 0 b23 5 b22 0 dB
10 kHz b40 dB
b30 1 b29 6 b29 1 b30 3 b29 6 b28 9 b30 6 b29 6 b28 6 dB
Input Resistance
Pin 5
45 65 80 45 65 80 45 65 80 kX
Pin 2
4 3 5 6 6 9 4 3 5 6 6 9 4 3 5 6 6 9 kX
Output Resistance
Pin 6
1 8 2 4 3 0 1 8 2 4 3 0 1 8 2 4 3 0 kX
Pin 3
30 45
30 45
30 45 X
Pin 7
30 45
30 45
30 45 X
PSRR
f e 120 Hz
40 40 40 dB
Load Impedance
Pin 3
5 5 5 kX
Pin 7
5 5 5 kX
Note 1 Gaussian noise measured over a period of 50 ms with a CCIR filler and an average responding meter
2





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