LM1872 National Semiconductor, LM1872 Datasheet - Page 3

• Manufacturer Part Number: LM1872
• Description: Radio Control Receiver/Decoder
• Manufacturer: National Semiconductor

Mixer Input Impedance
Mixer Output Impedance
IF Transconductance
IF Input Impedance
IF Output Impedance
IF Carrier Level
Detector Threshold
Analog Pulse Width
Accuracy
AC Electrical Characteristics
Note 1 The criteria for the outputs to be considered ‘‘solid’’ are as follows
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
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
widths obtained for V
Parameter
Supply Current vs
Supply Voltage
Sensitivity vs Supply Voltage
IN
e
100 V
Pin 5 to Pin 4
(See Curves)
Pin 18 to GND
Pin 17 to Pin 15 (AGC Off)
Pin 17 to GND
Pin 15 to GND (AGC Off)
(AGC On)
Relative to RF Input
V
Relative to IF Output
Ratio of Received Pulse Width
Pulse Width
V
IN
IN
Pin 15 V
Pins 11
e
100 V
Pin 5
IN
12 to Transmitted
Conditions
e
(AGC On)
Pin 5 for
49 MHz
100 V
(Continued)
12) in any of the above four successive frames must not vary more than
Pin 15
Analog Channel Output
Voltage vs Load Current
Mixer Transconductance (g
vs Input Frequency
455 kHz
3
V
a
0 95
a
Min
2 6
0 015
m
)
20 k
V
a
5500
Typ
a
250
800
4 1
1 0
70
20
2
a
0 025
Digital Channel
Collector Output Voltage
vs Load Current
IF Output Signal Level vs RF
Input Signal Level
5 pF
V
a
g
Max
1 05
a
5% from the pulse
5 6
0 040
TL H 7912– 2
mmhos
mVrms
ms ms
Units
M
k
k
V
V