1 DeviceOperatingTemperature RangePackageMC3357 SEMICONDUCTORTECHNICAL DATALOW POWERFM IFORDERING INFORMATIONMC3357 DMC3357 PTA = 30 to +70 CSO 16 Plastic DIPPIN CONNECTIONSO rder this document by MC3357/DP SUFFIXPLASTIC PACKAGECASE 648D SUFFIXPLASTIC PACKAGECASE 751B(SO 16) ANALOG IC DEVICE DATALow Power Narrowband FM IF.. includes Oscillator, Mixer, Limiting Amplifier, Quadrature Discriminator,Active Filter, Squelch, Scan Control, and Mute Switch. The MC3357 isdesigned for use in FM dual conversion communications equipment. Low Drain Current ( mA (Typical) @ VCC = Vdc) Excellent Sensitivity: Input Limiting Voltage ( dB) = V (Typical) Low Number of External Parts Required Recommend MC3372 for Replacement/UpgradeFigure 1.
2 Representative Block MHz InputGroundZ2 AudioNoiseDetectorZ1 Audio MuteScan ControlActiveFilter V+455 MHzVCCQuadCoilDemodulatorLimiterAmp16141 513121110987654321 OscillatorMixerSquelch TriggerWith Hysteresis Motorola, Inc. 1996 Rev 5MC33572 MOTOROLA ANALOG IC DEVICE DATAMAXIMUM RATINGS (TA = 25 C, unless otherwise noted)RatingPinSymbolValueUnitPower Supply Voltage4 VCC(max)12 VdcOperating Supply Voltage Range4 VCC4 to 8 VdcDetector Input Voltage8 pInput Voltage (VCC q Volts) Function14V14 to Temperature TJ150 COperating Ambient Temperature Range TA 30 to + 70 CStorage Temperature Range Tstg 65 to + 150 CELECTRICAL CHARACTERISTICS (VCC= Vdc, fo = MHz, f = kHz, fmod = kHz, TA = 25 C, unless otherwise noted.)CharacteristicPinMinTypMaxUnitDra in Current Squelch OffDrain CurrentSquelch On4 Limiting Voltage ( 3 dB Limiting)16 VDetector Output Voltage9 VdcDetector Output Impedance 400 Recovered Audio Output Voltage (Vin = 10 mV)9200350 mVrmsFilter Gain (10 kHz) (Vin = 5 mV) 4046 dBFilter Output Hysteresis 100 mVMute Function Low14 1550 Mute Function M Scan Function Low (Mute Off)(V12 = 2 Vdc)13 Function High (Mute On)(V12 = Gnd) VdcMixer Conversion Gain3 20 dBMixer Input Resistance16 k Mixer Input Capacitance16 pFMC33573 MOTOROLA ANALOG IC DEVICE DATAF igure 2.
3 Test Circuit20 pF120 FVCC = MHz50 k455 kHzFilter100 k51 k100 nF47 k10 pFLP = mHCP = 100 pFRP = 100 k muRataCFU455 k390 FFilter InAudio Out100 nF10 k10 VdcOp Amp Output5678+CIRCUIT DESCRIPTIONThe MC3357 is a low power FM IF circuit designedprimarily for use in voice communication scanning mixer oscillator combination converts the inputfrequency ( , MHz) down to 455 kHz, where, afterexternal bandpass filtering, most of the amplification is audio is recovered using a conventional quadrature FMdetector. The absence of an input signal is indicated by thepresence of noise above the desired audio frequencies. This noise band is monitored by an active filter and a detector. Asquelch trigger circuit indicates the presence of a noise (or atone) by an output which can be used to control scanning.
4 Atthe same time, an internal switch is operated which can beused to mute the oscillator is an internally biased Colpitts type with thecollector, base, and emitter connections at Pins 4, 1, and 2respectively. A crystal can be used in place of the usual mixer is doubly balanced to reduce spuriousresponses. The input impedance at Pin 16 is set by a k internal biasing resistor and has low capacitance, allowingthe circuit to be preceded by a crystal filter. The collectoroutput at Pin 3 must be dc connected to B +, below which itcan swing suitable bandpass filtering (ceramic or LC), the signalgoes to the input of a five stage limiter at Pin 5. The output ofthe limiter at Pin 7 drives a multiplier, both internally directly,and externally through a quadrature coil, to detect the FM.
5 Theoutput at Pin 7 is also used to supply dc feedback to Pin 5. Theother side of the first limiter stage is decoupled at Pin recovered audio is partially filtered, then buffered,giving an impedance of around 400 at Pin 9. The signal stillrequires de emphasis, volume control and furtheramplification before driving a simple inverting op amp is provided with an output at Pin11 providing dc bias (externally) to the input at Pin 10 which isreferred internally to V. A filter can be made with externalimpedance elements to discriminate between an external AM detector, the filtered audio signal can bechecked for the presence of noise above the normal audioband, or a tone signal. This information is applied to Pin external positive bias to Pin 12 sets up the squelchtrigger circuit such that Pin 13 is low at an impedance level ofaround 60 k , and the audio mute (Pin 14) is open circuit.
6 IfPin 12 is pulled down to V by the noise or tone detector,Pin 13 will rise to approximately Vdc below supply whereit can support a load current of around 500 A and Pin 14 isinternally short circuited to ground. There is 100 mV ofhysteresis at Pin 12 to prevent jitter. Audio muting isaccomplished by connecting Pin 14 to a high impedanceground reference point in the audio path between Pin 9 andthe audio ANALOG IC DEVICE k216515 k100 k100 k30 k30 k30 k15 k15 k1110510 k10 k30 k20 k3141520 k1050 k2221201918161750 k121122 k23242526220 k15 k10 k50 k47050 kC127322829303110 k10 k10 k10 k10 k10 k10 k10 k10 k10 k33 k33 k33 k33 k10 k120 k10k44434552494846505153545558575650 k100 kC28 Figure 3. Circuit SchematicMC33575 MOTOROLA ANALOG IC DEVICE DATAOUTLINE DIMENSIONSNOTES:1.
7 DIMENSIONING AND TOLERANCING PER , CONTROLLING DIMENSION: DIMENSION L TO CENTER OF LEADS WHENFORMED DIMENSION B DOES NOT INCLUDE MOLD ROUNDED CORNERS OPTIONAL. A BFCSHGDJLM16 PLSEATING18916 KPLANE T ( ) 10 0 10 :1. DIMENSIONING AND TOLERANCING PER , CONTROLLING DIMENSION: DIMENSIONS A AND B DO NOT INCLUDEMOLD MAXIMUM MOLD PROTRUSION ( )PER DIMENSION D DOES NOT INCLUDE DAMBARPROTRUSION. ALLOWABLE DAMBARPROTRUSION SHALL BE ( ) TOTALIN EXCESS OF THE D DIMENSION ATMAXIMUM MATERIAL 45_G8 PLP B A ( )BS T DKC16 ( ) 7 0 7 SUFFIXPLASTIC PACKAGECASE 648 08 ISSUE RD SUFFIXPLASTIC PACKAGECASE 751B 05(SO 16)ISSUE JMC33576 MOTOROLA ANALOG IC DEVICE DATAM otorola reserves the right to make changes without further notice to any products herein.
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10 ; Tatsumi SPD JLDC, 6F Seibu Butsuryu Center, Box 20912; Phoenix, Arizona 85036. 1 800 441 2447 or 602 303 54543 14 2 Tatsumi Koto Ku, Tokyo 135, Japan. 03 81 3521 8315 MFAX: TOUCHTONE 602 244 6609 ASIA / PACIFIC: Motorola Semiconductors Ltd.; 8B Tai Ping Industrial Park, INTERNET: http://Design Ting Kok Road, Tai Po, , Hong Kong. 852 26629298MC3357/D*MC3357/D* This datasheet has been download for electronics components.