Maker : National Semiconductor
Part No. : LM3361AN

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Product Information

LM3361A Low Voltage Power Narrow Band FM IF System August 1989 LM3361A Low Voltage Power Narrow Band FM IF System General Description The LM3361A contains a complete narrow band FM demodulation 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 operating characteristics Features Y Y Y Y Y Y Functions at low supply voltage (less than 2V) Highly sensitive (b3 dB limiting at 2 0 mV input typical) High audio output (increased 6 dB over MC3361) Low drain current (2 8 mA typ VCC e 3 6V) Minimal drain current increase when squelched Low external parts count Block Diagram and Test Circuit TL H 5586 – 1 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 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications 12 V 1 Vrms RF Input Voltage (VSl3 6V) b 0 7 to 5 Vp Mute Function (pin 14) Operating Ambient Temperature Range 0 C to a 70 C b 55 C to a 150 C Storage Temperature Range Package Dissipation (Note 1) Power Supply Voltage (VS) 1500 mW Soldering Information Dual-In-Line Package Soldering (10 seconds) Small Outline Package Vapor Phase (60 seconds) Infrared (15 seconds) 260 C 215 C 220 C See AN-450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ for other methods of soldering surface mount devices Parameters Guaranteed By Electrical Testing (Test ckt TA e 25 C VS e 3 6V fO e 10 7 MHz Df e g 3 kHz fMOD e 1 kHz 50X source) Parameter Supply Voltage Range Supply Current Squelch Off Squelch On RF Input for b3 dB Limiting Recovered Audio at Audio Output Audio Out DC Op Amp Gain Op Amp Output DC Op Amp Input Bias Current Scan Voltage Pin 12 high (2V) Pin 12 Low (0V) Mute Switch Impedance Pin 12 e 0V Switch S1 from pos 1 to pos 2 VS IS IS RF Input Audio Output V9 V11 VIN V10 (V10bV11) 1MX V13 V13 DV14 DI14 200 12 40 04 Measure Min 20 Typ 36 28 36 20 350 15 55 07 20 0 34 15 75 05 18 Max 90 50 60 60 Units V mA mA mV mVRMS VDC dB VDC nA VDC VDC X 30 30 Design Parameters Not Tested or Guaranteed Mixer Conversion Gain (Note 2) Mixer Input Resistance Mixer Input Capacitance Detector Output Impedance Squelch Hysterisis Mute Off Impedance (measure pin 14 with pin 12 Squelch Threshold Detector Center Frequency Slope Typ 46 36 22 500 100 10 0 65 0 15 V V kX pF X mV MX VDC V kHz 2V) 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 Typical Performance Characteristics (Test Circuits) TL H 5586 – 2 3 4 TL H 5586 – 3 Internal Schematic Applications Information (See Internal Schematic) OSCILLATOR The Colpitts type oscillator is internally biased with a regulated current source which assures proper operation over a wide supply range The collector base and emitter terminals are at pins 4 1 and 2 respectively The crystal which is used in the parallel resonant mode may be replaced with an appropriate inductor if the application does not require the stability of a crystal oscillator In this case the resonant frequency will ...

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