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LM1894N Datenblatt(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer LM1894N
Bauteilbeschribung  Dynamic Noise Reduction System DNR
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

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Electrical Characteristics (Continued)
V
S = 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
DS007918-13
Channel Separation
(Referred to the Output)
vs Frequency
DS007918-14
Power Supply Rejection
Ratio (Referred to the
Output) vs Frequency
DS007918-15
THD vs Frequency
DS007918-16
−3 dB Bandwidth
vs Frequency and
Control Signal
DS007918-17
Gain of Control Path
vs Frequency (with
10 kHz FM Pilot Filter)
DS007918-18
www.national.com
3


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