LM1112CN ,24 V, 15 mA, dolby B-type noise reduction processorLM1112A/LM111ZB/LM1112C
National
Semiconductor
LM1112A/LM11128/LM1112C
Dolby@ B-Type Noise ..
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LM1112BN-LM1112CN
24 V, 15 mA, dolby B-type noise reduction processor
LM1112A/LM11123/LM11120
_ National
Semiconductor
LM1112A/LM1112B/LM1112C
Dolby© B-Type Noise Reduction Processor
General Description
The LM1112 is a monolithic integrated circuit specifically
designed to realize the Dolby B-type noise reduction sys-
It is a replacement for the LM1111 and the Signetics NE-
645/648 but with improved performance figures.
Features
a Very high signal/noise ratio, 74 dB encode
(CClR/ARM)
n Wide supply voltage range, 6V to 20V
,, Very close matching to standard Dolby characteristics
a Audible switch-on transients greatly reduced
I: Improved temperature performance
II Reduced number of precision external components
a Improved transient stability
I: 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 doubIe-D symbol are registered trademarks of Dolby Laboratories Licensing Corporation.
Schematic Diagram
1 ~ 4 a (l) (l) a
(E) g“ _ m 2K m M 4K7 at,:" m
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Ttl) '
700 3K3 4tt3 ’175 st’ jmmu
TL/H/7876-t
Absolute Maximum Ratings
If Mllltary/Aerospace speclfled devlces are required,
please contact the National Semicttndutttor Sales
offltte/DItttrlbutttrtg fur availability and specifications.
Supply Voltage 24V
Operating Temperature Range -20''G to + 70''C
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
--65"C to + 150''C
26ty'C
Electrical Characteristics Vs = 12V, TA = 25°C. 0 dB refers to Dolby level which is 580 mVrms at pin 3.
Parameter Conditions LM111 2A LM1tt2B LM11120 Units
Mln Typ Max Mln Typ Max Mln Typ Max
Supply Voltage Range 6 20 6 20 6 20 V
Supply Current 15 20 15 20 15 20 mA
Voltgge Gain .
(Pin 5-3) 215::92'1236 and 12 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) 2,te,it'iltstut, - 0.5 o 0.5 -0.5 o 0.5 - 1 o 1 dB
Distortion 1 kHz, 0 dB 0.03 0.1 0.03 0.1 0.03 0.1 %
10 kHz, + 10 dB 0.2 0.2 0.2 %
Signal Handling 1 kHz, 0.3% Distortion
Vs = 6V 8.5 8.5 8.5 dB
Vs = 12V 13 15.5 13 15.5 13 15.5 dB
Vs = 18V 19 19 19 dB
Signal/Noise Ratio Pins 6 and 2
at Pin 7 (Note 1) Connected
Encode Mode
(CCIH/ARM)
NR In Rs = 10k 71.5 74 71 74 70 74 dB
Rs = 1k 77 77 77 dB
NR Out Rs = 10k 83 83 83 dB
$533143? RS 10k 83 ea 83 dB
Encode Characteristics Input to Pin 5
10 kHz, 0 dB 0 0.5 1.0 -0.2 0.5 1.2 -0.5 0.5 1.5 dB
1.3 kHz, -20 dB -16.2 -15.7 -15.2 -16.7 -15.7 -14.7 -17.2 -15.7 --14.2 dB
5 kHz, -20 dB -17.3 -16.8 -16.3 -17.8 -16.8 -15.8 -18.3 -16.8 -15.3 dB
3 kHz, -30 dB -21.7 -21.2 -20.7 -22.2 -21.2 --20.2 -22.7 -21.2 -19.7 dB
5 kHz, -30 dB -22.3 -21.8 -21.3 -22.8 -21.8 -20.8 -23.3 -21.8 -20.3 dB
10 kHz, -30 dB --24.0 - 23.5 _ 23.0 -24.5 -23.5 -22.5 -25.0 --23.5 -22.0 dB
10 kHz, -40 dB --30.1 -29.6 - 29.1 - 30.3 -29.6 -28.9 -30.6 - 29.6 - 28.6 dB
Input Resistance Pin 5 45 65 80 45 65 80 45 65 80 kn
Pin 2 4.3 5.6 6.9 4.3 5.6 6.9 4.3 5.6 6.9 kn
Output Resistance Pin 6 1.8 2.4 3.0 1.8 2.4 3.0 1.8 2.4 3.0 kn
Pin 3 30 45 30 45 30 45 n
Pin 7 30 45 30 45 30 45 n
PSHR f = 120 Hz 40 40 40 dB
Load Impedance
Pin 3 5 5 5 kn
Pin 7 5 5 5 kn
Note 1: Gaussian noise, measured over a period of 50 ms with a CCIR filler and an average responding meter.
OZI-l-l-W'l/GZI-H-W'l/VZLHW'I
LM1112A/LM11123/LM11120
Typical Performance Characteristics
SlgnaI/Nolsa Ratio " Source Impedance
Encode Mode (CCIR/ARM) Galn " Frequency (NR OFF)
Signallflobe (d8)
10 100 1K 10K 100K tht 1 10 100
Source Impedance (9) Frequency (KHz)
Total Harmonlc Dlslortlon - 0 dB Level Total Harmony Dlstortlon - + 10 dB Level
T.H.D. 1%)
0.1 1 10 too 0.1 1 10
Frequency (K111) Frequency ttttul
Back to Back Response Error vs Frequency and Back to Back Response " Frequency and
Supply Voltage (Standard Dolby Encoder) Temperature (Encoder Temperature 25°C)
+1 tht +
8w Laval (d8)
Signal Level (dB)
0.1 20 100 0,1
Frequency (KHz)
Froquancy (KHz)
TL/H/7576- 2
TU H /7876-3
TL/H/787e-4
Typical Performance Characteristics (Continued)
Current vs Supply Voltage
Supply Current (mA)
s 8101214161820
SupplyVoltatteM
SW Handing (d8)
Signal Handling " Supply Voltage
6 8 lo 12 14 16 " 20
Supply Voltage M
TL/H/7876-5
TRANSIENT RESPONSE TO ABRUPT LEVEL CHANGE (Measured at pln 7)
(a) Encode (f = 5 kHz)
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TL/H/7876-5
(b) Encoded and Decoded " = 5 kHz)
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TL/H/7876-7
TRANSIENT RESPONSE TO ABRUPT FREQUENCY CHANGE (Measured at pln 7)
(a) Encode (- 20 dB)
II II II
IIIJIIIII'
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1.5 klh
so mV/ ow
100 mS/ DIV
TL/H/7B76-8
(b) Encoded and Decoded (-20 dB)
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1.5km - 10km
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II II IIII hl llll ll
ods/av
TL/H/7876-9
OZLI-LW'I/QZHLW'l/VZLl-l-W'I
LM1112A/LM111ZB/LM1112C
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.
DOLBY B-TYPE INTEGRATED CIRCUIT
NATIONAL LM1112.
Noise Reduction
Switch
OUT R _F
V m It
NR Lamp i
To C338 in
othev Dolby
Processors
G -.f- - I
13 $14 15 I
150K m
6% 270K
w car?
330K .
TL/H/7876- 10
Note 1: Where not otherwise tpscitied, component tolerances are f 10%.
Signal Boost vs Pin 14 Control Voltage
(Encode, 10 kHz)
Signal Boost (dB)
1. a m
Minimum Boost with
o 2 4 e a 10
Pin " Voitage M
Supply Cum! (mAl
Supply Current vs Pin " Control Voltage
(Vs = 12V) (Encode, 10 kHz)
6 8 10 12
Pin " Voitago M
TL/H/7876- 11
Test Circuit (Encode)
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TL/H/7876-12
Note 1: 1 nF capacitors from pin 3 and pin 7 to ground may be required on older devices.
Note 2: Where not otherwise spoeitied, component tolerances are 110%,
Note 3: For LM1 1 12AN use 2% components for C304, H303, R305. (5% components may cause errors up to +0.3 dB.)
Connection Diagram
Dual-in-Line Package
IMPEDANCE t U "
mm - - Posmv: SUPPLY
AMPLIFIER a t "
"M" - - vmnu mnoauce
AMPunER a ,3. .2. azmm 01mm
am - - nscnnzn nus
""u'l'llut -- - nscnnm mm
AMPLIFIER A 2. " am until tt
OUTPUT - oU8Ptn
AMPLIFIER " J. I'.. ‘w Ul Mt o
OUTPUT mnucx Decoumm
oecounma .2, L anouuo
TL/H/7876-13
Order Number LM1112AN, LM11123N
or LM11120N
See NS Package Number N16E
ozmmlazmm/vzmm
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
National Semiconductor was acquired by Texas Instruments.
corp/docs/irwestor_relations/Pr_09_23_201 1_national_semiconductor.html
This file is the datasheet for the following electronic components:
LM1112CN - product/Im111Zen?HQS=TI-null-nu|I-dscataIog-df-pf-null-wwe
LM1112AN - product/lm1112an?HQS=T|-nu|I-null-dscataIog-df-pf-null-wwe
LM1112BN - product/Im1112bn?HQS=TI-nu|I-null-dscataIog-df-pf-null-wwe
