Low Power Narrow Band Fm If Mc3361

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LOW POWER NARROW BAND FM IF 　　 MC3361 Outline Drawing DESCRIPTION The MC3361 is design ed for use in FM dual conversion co mmunication. It contains a complete narrow band FM demodulation system operable to less than 2.0V supply voltage. This low po wer narrow band FM IF system provides the second converter, second IF, de modulator. Filter Amp and squelch circuitry for co mmunications and scanning receivers. MC3361 SUM ***Y 16 FEATURE z Operating voltage range : 2.0V ~ 8.0V z Low Current consumption I C C =4.0mA Typ. (V C C =4.0 V) z Excellent input sensitiv ity MC3361 SUM **** (-3dB Limi ting = 2.0 µVrms Typ.) z Low number of external parts required z Operating frequency up to 60MHz D IP-1 6 PIN CONFIGURATION { Crystal OSC 1 16 RF Input 2 15 GND Mixer Output 3 Vcc 4 Limiter Input 5 14 Audio Mute MC3361 13 Scan Control 12 Squelch Input Decouping 6 11 Filter output Decouping 7 10 Filter Input Quadrature 8 Input 9 Audio Output 1/5 MC3361 ABSOLUTE MAXIMUM RATINGS (Ta=25 °C) Characteristic Symbol Value Unit Vcc ( M A X ) 10 V Supply Voltage Range Vcc 2.0~8.0 V Detector Input Vo ltage VIN(DET) 1.0 Vp-p RF Input Voltage VIN(RF) 1.0 Vr ms Mute Function VMUTE -0.5~+5.0 Vpeak Operating Te mperature Topr -20~+70 °C Storage Temperature Tstg -65~150 °C Maximu m Supply Voltage ELECTRICAL CHARACTERISTICS (Unless otherwise specified: Ta=2 5°C, Vcc=4V, fo=10.7MHz, fm=1kHz, ∆f=±3kHz) Characteristics Squelch Current Audio Output Voltage Input Li miting Vo ltage To tal Harmonic Distortion Recovered Output Noise Vo ltage Drop Voltage AF Gain Loss Detector Output Resistance Signal to Noise Ratio Symbol Test conditions Min Typ Max Unit ICC1 Squelch off (V 1 2 =2V) 2.9 3.9 4.9 ICC2 Squelch on (V 1 2 =0V) 4.4 5.4 6.4 VOUT Vin=10mVr ms 130 160 200 mV r m s VIN(Lim) -3dB Limiting 2.0 6.0 µV THD V O U T =170mVr ms 0.8 VNO No Input Signal 60 80 ∆Gv Vcc=4V → 2V -3 -0.6 dB 450 Ω 36 67 dB 40 50 dB 1.0 1.3 ROUT S/N Filter Gain Filter Output DC Vo ltage Mute Low Resistance Gv Vin=5 mVr ms, f=10kHz RON(Mute) Mute Switch-on Mute High Resistance ROff(Mute) Mute Switch-off VO(DC) Scan Control Low VL(Scan) Mute off(V 1 2 =2V) Scan Contro l High VH(Scan) Mute on(V 1 2 =0V) Trigger Hysteresis VTH Squelch on/off 1.0 % 250 1.6 mV r m s VDC 10 Ω 10 MΩ 0 3.0 mA 0.4 3 .5 45 VDC VDC 100 mV r m s Mixer Co nversion Gain GV(Mix) 28 dB Mixer Input Resistance Ri(Mix) 3.3 kΩ Mixer Input Capacitance Ci(Mix) 2.2 pF 2/5 MC3361 BLOCK DIAGRAM AND TEST CIRCUIT 16 510 470K 15 14 13 12 8.2K 1.0uF 1.0uF 51 AF Out Filter In 9 10 11 0.01uF Audio Sca n SQ SW Mute Control Input Filter Out 10K 0.01uF Mixe r Input 10.7MHz AF Am p Filter Am p + Squelc h Trigge r with Hyste resis De modulator Lim iter Am p CFU 455D 1.8K 6 7 8 20K MURATA 5 0.1uF 4 0.1uF Vc c FL1 10.245 MHz 220pF 68pF 3 0.1uF 2 52K 1.8K Osc illator 1 50K Mixe r 10pF 3/5 MC3361 APPLICATION CIRCUIT Vc c=4V 10uF 100K 18K 6.8K 0.001uF Sca n Control to PLL 15 14 13 11 12 10 9 5 6 7 8 Quad Coil 0.1uF 4 0.047uF 0.1uF 20K FL1 220pF 10.245 MHz 3 0.1uF 2 68pF AF Output 22K 51 MC3361 1 3.3K 470K 51 16 4.7K 0.001uF 0.022uF 0.01uF IF Input 10.7MHz 0.1uF 10K 4.7uF 1K TYPICAL PERFORMANCE CHARACTERISTICS 4/5 MC3361 5/5