MC3362

Low-Power FM ReceiverNarrowband. . . includes dual FM conversion with oscillators, mixers, quadraturediscriminator, and meter drive/carrier detect circuitry. The MC3362 also hasbuffered first and second local oscillator outputs and a comparator circuit forFSK detection.•Complete Dual Conversion Circuitry•Low Voltage: V•CC = 2.0 to 6.0 VdcLow Drain Current (3.6 mA (Typical) @ V•CC = 3.0 Vdc)Excellent Sensitivity: Input Voltage 0.6 µVrms (Typical)for 12 dB SINAD•Externally Adjustable Carrier Detect Function•Low Number of External Parts Required•Manufactured Using Motorolais MOSAICr Process Technology•MC13135 is Preferred for New DesignsFigure 1. Simplified Application in a PLL FrequencySynthesized ReceiverRF Inputto 200 MHzFigure 2. InputMatchV0.01CC120 pF124From PLL Phase223Detector0.0110.245 MHz50 pF32240.41 µH21Ceramic Filter5MC336220To PLL or Prescaler455 kHz619Ceramic Filter71810.7 MHz0.10.18171.0+91610 k0.1200 k10150.114DataVCC10 kTo Carrier11IndicatorDetect39 K12130.001Recovered8.2 k0.01 AudioLp=680 µHCp=180 pFMOTOROLA ANALOG IC DEVICE DATAOrder this document by MC3362/DMC3362LOW–POWERDUAL CONVERSIONFM RECEIVERSEMICONDUCTORTECHNICAL DATAP SUFFIXPLASTIC PACKAGECASE 724DW SUFFIXPLASTIC PACKAGECASE 751E(SO-24L)Figure 2. Pin Connections andRepresentative Block Diagram1st Mixer Input1241st Mixer Input2nd LO Output2X23Varicap Control2nd LO Emitter3221st LO Tank2nd LO Base4211st LO Tank2nd Mixer Output5X201st LO OutputVCC6191st Mixer OutputLimiter Input7182nd Mixer InputLimiterDecoupling8172nd Mixer InputLimiterDecoupling916VEEMeter Drive1015Comparator OutputCarrier Detect1114Comparator InputQuadrature Coil12X13Detector OutputORDERING INFORMATIONOperatingDeviceTemperature RangePackageMC3362DWSO–24LMC3362PTA = –40 to +85°CPlastic DIP©Motorola, Inc. 1996Rev 2 1MC3362MAXIMUM RATING (TA = 25°C, unless otherwise noted)RatingPower Supply Voltage (See Figure 2)Operating Supply Voltage Range (Recommended)Input Voltage (VCC q 5.0 Vdc)Junction TemperatureOperating Ambient Temperature RangeStorage Temperature RangePin661, 24–––SymbolVCC(max)VCCV1–24TJTATstgValue7.02.0 to 6.01.0150– 40 to + 85– 65 to + 150UnitVdcVdcVrms°C°C°Cunless otherwise noted)ELECTRICAL CHARACTERISTICS (VCC = 5.0 Vdc, fo = 49.7 MHz, Deviation = 3.0 kHz, TA = 25°C, Test Circuit of Figure 3,CharacteristicDrain Current (Carrier Detect Low – See Figure 5)Input for –3.0 dB LimitingInput for 12 dB SINAD (See Figure 9)Series Equivalent Input ImpedenceRecovered Audio (RF signal level = 10 mV)Noise Output (RF signal level = 0 mV)Carrier Detect Threshold (below VCC)Meter Drive SlopeInput for 20 dB (S + N)/N (See Figure 7)First Mixer 3rd Order Intercept (Input)First Mixer Input Resistance (Rp)First Mixer Input Capacitance (Cp)Conversion Voltage Gain, First MixerConversion Voltage Gain, Second MixerDector Output Resistance1313131010Pin6Min–––––––––––––––Typ4.50.70.6450–j3503502500.641000.7–226907.218211.4Max7.02.0–––––––––––––kΩUnitsmAµVrmsµVrmsΩmVrmsmVrmsVdcnA/dBµVrmsdBmΩpFdBRFInput50 Ω120 pF10.245MHzFerronics12–345–KFigure 3. Test Circuit2:650 pF123452423222120MC3362191817161514130.0110.5 TurnsCoilcraftUNI–10/142FL1:muRata CFU455DorToko LFC–4551FL2:muRata SFE10.7MAorToko SK107M3–A0–1033 pFFL10.10.168 kΩ180 pF6789101112FL20.1VCCToko RMC–2A6597HM1.0 µF+VEENOTE: See AN980 for Additional Design Information. 2MOTOROLA ANALOG IC DEVICE DATAMC3362Figure 5. Drain Current, Recovered Audioversus Supply8.0VCCA10MC3362I C C (mA)7.06.05.04.03.02.01.0001.02.03.04.0VCC (V)5.06.07.0Recovered AudioICC, Carr. Det. Low (RF in = 10 mV)ICC, Carr. Det. High (RF in = 0 mV)800700600V1 3 (mVrms)50040030020010008.0Figure 4. IMeter versus Input1211109.0I ( µ A)108.07.06.05.04.03.02.0– 130– 120– 110– 100– 90– 80– 70– 60– 50– 40– 30RF INPUT (dBm)Figure 6. Signal Levels302010S + N, N, AMR (dB)0POWER (dBm)– 10– 20– 30– 40– 50– 60Second Mixer OutputFirst Mixer OutputSecond Mixer InputFirst Mixer Input20100– 10– 20– 30– 40– 50– 60– 70Figure 7. S + N, N, AMR versus InputS + NS + N 30% AMMC33621310 k0.0110 k0.01– 50– 40– 30NRF Input to Transformer– 70– 130– 120– 110– 100– 90– 80– 70– 60– 50– 40– 30RF INPUT (dBm)– 80– 130– 120– 110– 100– 90– 80– 70– 60RF INPUT (dBm)Figure 8. 1st Mixer 3rd Order Intermodulation20100– 10– 30– 40– 50– 60– 70– 80– 100– 90– 80 – 70– 60– 50– 40– 30RF INPUT (dBm)– 20– 1000– 40Desired Products3rd Order Intermod.ProductsV1 3 (Vdc)– 20dB3.04.0Figure 9. Detector Output versus Frequency2.01.0– 301020– 20– 100RELATIVE INPUT FREQUENCY (kHz)3040MOTOROLA ANALOG IC DEVICE DATA 3MC3362Figure 10. PC Board Test Circuit(LC Oscillator Configuration Used in PLL Synthesized Receiver)RF Input49.67 MHz50 Ω18 p1000 p10.47 µ23120 p50 p42120VCC670.18171615–+10 k140.00112(MC3362)138.2 k0.0119CRF21810.7 MHzCer. Filt.0.113.0 kFirst Local OscillatorBuffered Outputto VCCCRF1 = muRata CFU 455X – the Xsuffix denotes 6.0 dB bandwidth.Rin = Rout = 1.5 to 2.0 kΩ.CRF2 = muRata SFA10.7 MF5 orSFE10.7 or equivalent. Rin = Rout= 330 Ω. Crystal filters can be used but impedance matching willneed to be added to ensure properfilter characteristics are realized.FSK Data Output(optional)RecoveredAudio24230.012233 p0.41 µ0.01Varactor Control(keep 0.7 V p V23 p VCC)(This network must be tuned to exactly10.7 MHz above or below the incomingRF signal.NOTE: The IF is rolled off above 10.7MHz to reduce L.O. feedthrough.)VCC = 2.0 to 7.0 Vdc10.245, Fund. Mode32 pF Load455 kHzCer. Filt.CRF150.1100 k0.1951 k1011CD AdjustCarrierDetect10 k39 k455 kHzLC ResonatorFigure 10A. Crystal Oscillator Configuration for Single Channel Application23Crystal used is series mode resonant(no load capacity specified), 3rd overtone.This method has not proven adequate forfundamental mode, 5th or 7th overtone crystals.The inductor and capacitor will need to bechanged for other frequency crystals. SeeAN980 for further information.MC33622220 k0.68 µ300VCC210.68 µ38.97 MHz20 k 4MOTOROLA ANALOG IC DEVICE DATAMC3362Figure 11. Component Placement ViewShowing Crystal Oscillator CircuitFigure 11A. LC Oscillator Component View.01.01.01.0150p120p10.245MHzXT.11.CF455KHz.1.151K10K68KMC3362P10.7 MHzCF.110K100KL.O.OUT.047238.2 K10K3K2210K1.013110.7MHzCF33p.68µH39 MHzXT330CONTROL1Kp.47 µH18p.68µH7531METERDRIVEDATAREC.AUDIONOTES:1.Recovered Audio components may be deleted when usingdata output.2.Carrier Detect components must be deleted in order to obtainlinear Meter Drive output. With these components in place theMeter Drive outputs serve only to trip the Carrier Detect indicator.3.Data Output components should be deleted in applicationswhere only audio modulation is used. For combined audio/dataapplications, the 0.047 µF coupling capacitor will add distortionto the audio, so a pull–down resistor at pin 13 may be required.4.Use Toko 7MC81282 Quadrature coil.5.Meter Drive cannot be used simultaneously with Carrier Detect output.For analog meter drive, remove components labelled″2″and measuremeter current (4–12 µA) through ammeter to VCC.6.Either type of oscillator circuit may be used with any output circuitconfiguration.7.LC Oscillator Coil: Coilcraft UNI 10/42 10.5 turns, 0.41 µH CrystalOscillator circuit: trim coil, 0.68 µH. Coilcraft M1287–A.8.0.47 H, Coilcraft M1286–A. Input LC network used to match first mixerinput impedance to 50 Ω.CIRCUIT DESCRIPTIONThe MC3362 is a complete FM narrowband receiver fromantenna input to audio preamp output. The low voltage dualconversion design yields low power drain, excellentsensitivity and good image rejection in narrowband voice anddata link applications.In the typical application (Figure 1), the first mixeramplifies the signal and converts the RF input to 10.7 MHz.This IF signal is filtered externally and fed into the secondmixer, which further amplifies the signal and converts it to a455 kHz IF signal. After external bandpass filtering, the low IFis fed into the limiting amplifier and detection circuitry. Theaudio is recovered using a conventional quadrature detector.Twice–IF filtering is provided internally.The input signal level is monitored by meter drive circuitrywhich detects the amount of limiting in the limiting amplifier.The voltage at the meter drive pin determines the state of thecarrier detect output, which is active low.APPLICATIONS INFORMATIONThe first local oscillator can be run using a free–runningLC tank, as a VCO using PLL synthesis, or driven from anexternal crystal oscillator. It has been run to 190 MHz.* Abuffered output is available at Pin 20. The second localoscillator is a common base Colpitts type which is typicallyrun at 10.245 MHz under crystal control. A buffered output isavailable at Pin 2. Pins 2 and 3 are interchangeable.The mixers are doubly balanced to reduce spuriousresponses. The first and second mixers have conversiongains of 18 dB and 22 dB (typical), respectively, as seen inFigure 6. Mixer gain is stable with respect to supply voltage.For both conversions, the mixer impedances and pin layoutare designed to allow the user to employ low cost, readilyavailable ceramic filters. Overall sensitivity and AM rejectionare shown in Figure 7. The input level for 20 dB (S + N)/N is0.7 µV using the two–pole post–detection filter pictured.*If the first local oscillator (Pins 21 and/or 22) is driven from astrong external source (100 mVrms), the mixer can be used toover 450 MHz..2KMOTOROLA ANALOG IC DEVICE DATAL.O.OUT 5TOKO55VLC06379GT4.0473KCONTROLINPUT8.41 µHVccCARRIERDETECTGNDMC3362Following the first mixer, a 10.7 MHz ceramic band–passfilter is recommended. The 10.7 MHz filtered signal is thenfed into one second mixer input pin, the other input pin beingconnected to VCC. Pin 6 (VCC) is treated as a common pointfor emitter–driven signals.The 455 kHz IF is typically filtered using a ceramicbandpass filter then fed into the limiter input pin. The limiterhas 10 µV sensitivity for –3.0 dB limiting, flat to 1.0 MHz.The output of the limiter is internally connected to thequadrature detector, including a quadrature capacitor. Aparallel LC tank is needed externally from Pin 12 to VCC. A 39kΩ shunt resistance is included which determines the peakseparation of the quadrature detector; a smaller value willincrease the spacing and linearity but decrease recoveredaudio and sensitivity.A data shaping circuit is available and can be coupled tothe recovered audio output of Pin 13. The circuit is acomparator which is designed to detect zero crossings ofFSK modulation. Data rates are typically limited to 1200 baudto ensure data integrity and avoid adjacent channel “splatter.”Hysteresis is available by connecting a high valued resistorfrom Pin 15 to Pin 14. Values below 120 kΩ are notrecommended as the input signal cannot overcome thehysteresis.The meter drive circuitry detects input signal level bymonitoring the limiting amplifier stages. Figure 4 shows theunloaded current at Pin 10 versus input power. The meterdrive current can be used directly (RSSI) or can be used totrip the carrier detect circuit at a specified input power. To dothis, pick an RF trip level in dBm. Read the correspondingcurrent from Figure 4 and pick a resistor such that:R10 ' 0.64 Vdc / I10Hysteresis is available by connecting a high valued resistorRH between Pins 10 and 11. The formula is:Hysteresis = VCC/(RH x 10 –7) dBFigure 12. Circuit Side ViewMC3362P 4IREC. AUDIODATAMETERDRIVE4I 6MOTOROLA ANALOG IC DEVICE DATAGNDCARRIERDETECTVCCINPUTCONTROLL.O. OUTFigure 13. Representative Schematic Diagram231.0kΩ6VCC100Ω2011718224341.0kΩ400Ω400Ω1.4kΩ5MOTOROLA ANALOG IC DEVICE DATA101211bias1316VEEbias14bias1521biasbiasMC336272.0kΩ89 7MC3362OUTLINE DIMENSIONSP SUFFIXPLASTIC PACKAGECASE 724–03ISSUE D13–A–241–B–12NOTES:1.CHAMFERED CONTOUR OPTIONAL.2.DIMENSION L TO CENTER OF LEADS WHENFORMED PARALLEL.3.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.4.CONTROLLING DIMENSION: INCH.DIMABCDEFGJKLMNINCHESMILLIMETERSMINMAXMINMAX1.2301.26531.2532.130.2500.2706.356.850.1450.1753.694.440.0150.0200.380.510.050 BSC1.27 BSC0.0400.0601.021.520.100 BSC2.54 BSC0.0070.0120.180.300.1100.1402.803.550.300 BSC7.62 BSC0 15 0 15 ____0.0200.0400.511.01C–T–SEATINGPLANELKEGFD24 PLNOTE 1NJ0.25 (0.010)M24 PLM0.25 (0.010)TAMMTBM–A–2413DW SUFFIXPLASTIC PACKAGECASE 751E–04(SO-24L)ISSUE E–B–12XP0.010 (0.25)MBM112NOTES:1.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.2.CONTROLLING DIMENSION: MILLIMETER.3.DIMENSIONS A AND B DO NOT INCLUDEMOLD PROTRUSION.4.MAXIMUM MOLD PROTRUSION 0.15 (0.006)PER SIDE.5.DIMENSION D DOES NOT INCLUDE DAMBARPROTRUSION. ALLOWABLE DAMBARPROTRUSION SHALL BE 0.13 (0.005) TOTAL INEXCESS OF D DIMENSION AT MAXIMUMMATERIAL CONDITION.MILLIMETERSINCHESMINMAXMINMAX15.2515.540.6010.6127.407.600.2920.2992.352.650.0930.1040.350.490.0140.0190.410.900.0160.0351.27 BSC0.050 BSC0.230.320.0090.0130.130.290.0050.0110 8 0 8 ____10.0510.550.3950.4150.250.750.0100.02924XD0.010 (0.25)MJTASBSFRC–T–SEATINGPLANE22XX 45_MGKDIMABCDFGJKMPRMotorola reserves the right to make changes without further notice to any products herein. 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