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參數(shù)資料
| 型號(hào)： | LM1872N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Radio Control Receiver/Decoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP18 |
| 封裝： | PLASTIC, DIP-18 |
| 文件頁(yè)數(shù)： | 3/19頁(yè) |
| 文件大?。?/td> | 371K |
| 代理商： | LM1872N |
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AC Electrical Characteristics
(Continued)
Parameter
Conditions
Min
Typ
Max
Units
Mixer Input Impedance
Pin 5 to Pin 4
@
49 MHz
(See Curves)
20 k
X
a
5 pF
Mixer Output Impedance
Pin 18 to GND
250
k
X
IF Transconductance
Pin 17 to Pin 15 (AGC Off)
@
455 kHz
2.6
4.1
5.6
mmhos
IF Input Impedance
Pin 17 to GND
5500
X
IF Output Impedance
Pin 15 to GND (AGC Off)
800
k
X
(AGC On)
2
M
X
IF Carrier Level
@
Pin 15, V
IN
e
100
m
V
(AGC On)
70
mVrms
Detector Threshold
Relative to RF Input,
V
IN
,
@
Pin 5
20
m
V
Relative to IF Output
@
Pin 15
V
a
a
0.015
V
a
a
0.025
V
a
a
0.040
V
Analog Pulse Width
Accuracy
Ratio of Received Pulse Width
@
Pins 11 & 12 to Transmitted
Pulse Width
@
Pin 5 for
V
IN
e
100
m
V
0.95
1.0
1.05
ms/ms
Note 1:
The criteria for the outputs to be considered ‘‘solid’’ are as follows:
DIGITAL: In order to check the decoding section, four RF frames are inputted in sequence with the proper codes to exercise all four possible logical
output combinations at pins 7 and 9. For each frame the proper output logic state must exist.
ANALOG: Each analog pulse width (measured at pins 11 & 12) in any of the above four successive frames must not vary more than
g
5% from the pulse
widths obtained for V
IN
e
100
m
V.
Note 2:
For operation in ambient temperatures above 25
§
C, the device must be derated based on a 150
§
C maximum junction temperature and a package
thermal resistance of 75
§
C/W, junction to ambient.
Typical Performance Characteristics
Supply Voltage
Supply Current vs
Voltage vs Load Current
Analog Channel Output
vs Load Current
Collector Output Voltage
Digital Channel
Sensitivity vs Supply Voltage
vs Input Frequency
Mixer Transconductance (g
m
)
Input Signal Level
IF Output Signal Level vs RF
TL/H/7912–2
3
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