IF System. LM3661A Datasheet

LM3661A System. Datasheet pdf. Equivalent

LM3661A Datasheet
Recommendation LM3661A Datasheet
Part LM3661A
Description 1A Low Voltage/Power Narrow Band FM IF System
Feature LM3661A; LM3361A Low Voltage Power Narrow Band FM IF System August 1989 LM3361A Low Voltage Power Narrow Ba.
Manufacture National Semiconductor
Datasheet
Download LM3661A Datasheet




National Semiconductor LM3661A
August 1989
LM3361A Low Voltage Power Narrow Band FM IF System
General Description
The LM3361A contains a complete narrow band FM de-
modulation system operable to less than 2V supply voltage
Blocks within the device include an oscillator mixer FM IF
limiting amplifier FM demodulator op amp scan control
and mute switch The LM3361A is similar to the MC3361
with the following improvements the LM3361A has higher
voltage swing both at the op amp and audio outputs It also
has lower nominal drain current and a squelch circuit that
draws significantly less current than the MC3361 Device
pinout functions are identical with some slightly different op-
erating characteristics
Features
Y Functions at low supply voltage (less than 2V)
Y Highly sensitive (b3 dB limiting at 2 0 mV input typical)
Y High audio output (increased 6 dB over MC3361)
Y Low drain current (2 8 mA typ VCCe3 6V)
Y Minimal drain current increase when squelched
Y Low external parts count
Block Diagram and Test Circuit
Order Number LM3661AM
or LM3361AN
See NS Package Number
M16A or N16E
C1995 National Semiconductor Corporation TL H 5586
T1-TOKO RMC-2A6597HM
CF-MURATA CFU 455E
TL H 5586 – 1
RRD-B30M115 Printed in U S A



National Semiconductor LM3661A
Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Package Dissipation (Note 1)
1500 mW
Power Supply Voltage (VS)
RF Input Voltage (VSl3 6V)
Mute Function (pin 14)
12 V
1 Vrms
b0 7 to 5 Vp
Operating Ambient Temperature Range
0 C to a70 C
Storage Temperature Range
b55 C to a150 C
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
260 C
Small Outline Package
Vapor Phase (60 seconds)
Infrared (15 seconds)
215 C
220 C
See AN-450 ‘‘Surface Mounting Methods and Their Effect
on Product Reliability’’ for other methods of soldering sur-
face mount devices
Parameters Guaranteed By Electrical Testing
(Test ckt TAe25 C VSe3 6V fOe10 7 MHz Dfe g3 kHz fMODe1 kHz 50X source)
Parameter
Measure
Min Typ
Max
Units
Supply Voltage Range
Supply Current
Squelch Off
Squelch On
RF Input for b3 dB Limiting
VS
IS
IS
RF Input
20 36 90
28 50
36 60
20 60
V
mA
mA
mV
Recovered Audio at Audio Output
Audio Output
200 350
mVRMS
Audio Out DC
V9
12 15 18
VDC
Op Amp Gain
V11 VIN
40 55
dB
Op Amp Output DC
V10 0 4 0 7
VDC
Op Amp Input Bias Current
(V10bV11) 1MX
20 75
nA
Scan Voltage
Pin 12 high (2V)
Pin 12 Low (0V)
V13 0 0 5 VDC
V13 3 0 3 4
VDC
Mute Switch Impedance Pin 12 e 0V
Switch S1 from pos 1 to pos 2
DV14 DI14
15 30
X
Design Parameters Not Tested or Guaranteed
Typ
Mixer Conversion Gain (Note 2)
46 V V
Mixer Input Resistance
3 6 kX
Mixer Input Capacitance
2 2 pF
Detector Output Impedance
500 X
Squelch Hysterisis
100 mV
Mute Off Impedance (measure pin 14 with pin 12 2V)
10
MX
Squelch Threshold
Detector Center Frequency Slope
0 65
0 15
VDC
V kHz
Note 1 For operation above 25 C ambient temperature the device must be derated based on 150 C maximum junction temperature and a thermal resistance iJA
of 80 C W
Note 2 Mixer gain is supply dependent and effects overall sensitivity accordingly (See Typical Performance Characteristics)
Coils
Toko America
1250 Feehanville Drive
Mount Prospect IL 60056
(312) 297-0070
Filters
Murata
2200 Lake Park Drive
Smyrna GA 30080
(404) 436-1300
2



National Semiconductor LM3661A
Typical Performance Characteristics (Test Circuits)
TL H 5586 – 2
3







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