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LM1894M PDF даташит

Спецификация LM1894M изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «Dynamic Noise Reduction System DNR».

Детали детали

Номер произв LM1894M
Описание Dynamic Noise Reduction System DNR
Производители National Semiconductor
логотип National Semiconductor логотип 

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LM1894M Даташит, Описание, Даташиты
December 1994
LM1894
Dynamic Noise Reduction System DNR®
General Description
The LM1894 is a stereo noise reduction circuit for use with
audio playback systems. The DNR system is
non-complementary, meaning it does not require encoded
source material. The system is compatible with virtually all
prerecorded tapes and FM broadcasts. Psychoacoustic
masking, and an adaptive bandwidth scheme allow the DNR
to achieve 10 dB of noise reduction. DNR can save circuit
board space and cost because of the few additional compo-
nents required.
Features
n Non-complementary noise reduction, “single ended”
n Low cost external components, no critical matching
n Compatible with all prerecorded tapes and FM
n 10 dB effective tape noise reduction CCIR/ARM
weighted
n Wide supply range, 4.5V to 18V
n 1 Vrms input overload
Applications
n Automotive radio/tape players
n Compact portable tape players
n Quality HI-FI tape systems
n VCR playback noise reduction
n Video disc playback noise reduction
Typical Application
*R1 + R2 = 1 ktotal.
See Application Hints.
Order Number LM1894M or LM1894N
See NS Package Number M14A or N14A
FIGURE 1. Component Hook-Up for Stereo DNR System
DNR® is a registered trademark of National Semiconductor Corporation.
The DNR® system is licensed to National Semiconductor Corporation under U.S. patent 3,678,416 and 3,753,159.
Trademark and license agreement required for use of this product.
© 1999 National Semiconductor Corporation DS007918
DS007918-1
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LM1894M Даташит, Описание, Даташиты
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Input Voltage Range, Vpk
Operating Temperature (Note 2)
Storage Temperature
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
20V
VS/2
0˚C to +70˚C
−65˚C to +150˚C
260˚C
Small Outline Package
Vapor Phase (60 seconds)
215˚C
Infrared (15 seconds)
220˚C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage
to the device may occur. Operating Ratings indicate conditions for which the
device is functional, but do not guarantee specific performance limits.
Electrical Characteristics
VS = 8V, TA = 25˚C, VIN = 300 mV at 1 kHz, circuit shown in Figure 1 unless otherwise specified
Parameter
Conditions
Min Typ
Operating Supply Range
4.5 8
Supply Current
MAIN SIGNAL PATH
VS = 8V
17
Voltage Gain
DC Ground Pin 9, (Note 3)
−0.9
−1
DC Output Voltage
3.7 4.0
Channel Balance
DC Ground Pin 9
−1.0
Minimum Balance
AC Ground Pin 9 with 0.1 µF
675 965
Capacitor, (Note 3)
Maximum Bandwidth
DC Ground Pin 9, (Note 3)
27 34
Effective Noise Reduction
CCIR/ARM Weighted, (Note 4)
−10
Total Harmonic Distortion
DC Ground Pin 9
0.05
Input Headroom
Maximum VIN for 3% THD
AC Ground Pin 9
1.0
Output Headroom
Maximum VOUT for 3% THD
DC Ground Pin 9
VS − 1.5
Signal to Noise
BW = 20 Hz–20 kHz, re 300 mV
AC Ground Pin 9
79
DC Ground Pin 9
77
CCIR/ARM Weighted re 300 mV
(Note 5)
AC Ground Pin 9
82 88
DC Ground Pin 9
70 76
CCIR Peak, re 300 mV, (Note 6)
AC Ground Pin 9
77
DC Ground Pin 9
64
Input Impedance
Pin 2 and Pin 13
14 20
Channel Separation
DC Ground Pin 9
−50 −70
Power Supply Rejection
C14 = 100 µF,
VRIPPLE = 500 mVrms,
f = 1 kHz
−40 −56
Output DC Shift
Reference DVM to Pin 14 and
Measuree Output DC Shift from
4.0
Minimum to Maximum Band-
width, (Note 7).
CONTROL SIGNAL PATH
Summing Amplifier Voltage Gain
Both Channels Driven
0.9 1
Gain Amplifier Input Impedance
Voltage Gain
Pin 6
Pin 6 to Pin 8
24 30
21.5
24
Max
18
30
−1.1
4.3
1.0
1400
46
−14
0.1
26
20
1.1
39
26.5
Units
V
mA
V/V
V
dB
Hz
kHz
dB
%
Vrms
Vp-p
dB
dB
dB
dB
dB
dB
k
dB
dB
mV
V/V
k
V/V
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LM1894M Даташит, Описание, Даташиты
Electrical Characteristics (Continued)
VS = 8V, TA = 25˚C, VIN = 300 mV at 1 kHz, circuit shown in Figure 1 unless otherwise specified
Parameter
Conditions
Min Typ
Max
Units
CONTROL SIGNAL PATH
Peak Detector Input Impedance
Pin 9
560 700 840
Voltage Gain
Pin 9 to Pin 10
30 33 36 V/V
Attack Time
Measured to 90% of Final Value
300
500
700 µs
with 10 kHz Tone Burst
Decay Time
Measured to 90% of Final Value
45
60
75 ms
with 10 kHz Tone Burst
DC Voltage Range
Minimum Bandwidth to Maximum
1.1
3.8 V
Bandwidth
Note 2: For operation in ambient temperature above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance
of 1) 80˚C/W junction to ambient for the dual-in-line package, and 2) 105˚C/W junction to ambient for the small outline package.
Note 3: To force the DNR system into maximum bandwidth, DC ground the input to the peak detector, pin 9. A negative temperature coefficient of −0.5%/˚C on the
bandwidth, reduces the maximum bandwidth at increased ambient temperature or higher package dissipation. AC ground pin 9 or pin 6 to select minimum bandwidth.
To change minimum and maximum bandwidth, see Appliction Hints.
Note 4: The maximum noise reduction CCIR/ARM weighted is about 14 dB. This is accomplished by changing the bandwidth from maximum to minimum. In actual
operation, minimum bandwidth is not selected, a nominal minimum bandwidth of about 2 kHz gives −10 dB of noise reduction. See Application Hints.
Note 5: The CCIR/ARM weighted noise is measured with a 40 dB gain amplifier between the DNR system and the CCIR weighting filter; it is then input referred.
Note 6: Measured using the Rhode-Schwartz psophometer.
Note 7: Pin 10 is DC forced half way between the maximum bandwidth DC level and minimum bandwidth DC level. An AC 1 kHz signal is then applied to pin 10.
Its peak-to-peak amplitude is VDC (max BW) − VDC (min BW).
Typical Performance Characteristics
Supply Current vs
Supply Voltage
Channel Separation
(Referred to the Output)
vs Frequency
Power Supply Rejection
Ratio (Referred to the
Output) vs Frequency
DS007918-13
THD vs Frequency
−3 dB Bandwidth
vs Frequency and
Control Signal
DS007918-14
DS007918-15
Gain of Control Path
vs Frequency (with
10 kHz FM Pilot Filter)
DS007918-16
DS007918-17
3
DS007918-18
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