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參數(shù)資料
| 型號： | LM1894MT |
| 文件頁數(shù)： | 3/10頁 |
| 文件大小： | 291K |
| 代理商： | LM1894MT |
Electrical Characteristics
(Continued)
V
S
= 8V, T
A
= 25C, V
IN
= 300 mV at 1 kHz, circuit shown in Figure 1 unless otherwise specified
Parameter
CONTROL SIGNAL PATH
Peak Detector Input Impedance
Pin 9
Voltage Gain
Pin 9 to Pin 10
Attack Time
Measured to 90% of Final Value
with 10 kHz Tone Burst
Decay Time
Measured to 90% of Final Value
with 10 kHz Tone Burst
DC Voltage Range
Minimum Bandwidth to Maximum
Bandwidth
Note 2:
For operation in ambient temperature above 25C, the device must be derated based on a 150C maximum junction temperature and a thermal resistance
of 1) 80C/W junction to ambient for the dual-in-line package, 2) 105C/W junction to ambient for the small outline package, and 3) 150C/W junction to ambient for
the TSSOP 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 V
DC
(max BW) V
DC
(min BW).
Typical Performance Characteristics
Conditions
Min
Typ
Max
Units
560
30
300
700
33
500
840
36
700
V/V
μs
45
60
75
ms
1.1
3.8
V
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
L
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