Order this document by MC3362/D . . . includes dual FM conversion with oscillators, mixers, quadrature discriminator, and meter drive/carrier detect circuitry. The MC3362 also has buffered first and second local oscillator outputs and a comparator circuit for FSK detection. • Complete Dual Conversion Circuitry • • • • • • • LOW–POWER DUAL CONVERSION FM RECEIVER Low Voltage: VCC = 2.0 to 6.0 Vdc SEMICONDUCTOR TECHNICAL DATA Low Drain Current (3.6 mA (Typical) @ VCC = 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 P SUFFIX PLASTIC PACKAGE CASE 724 Manufactured Using Motorolais MOSAICr Process Technology MC13135 is Preferred for New Designs DW SUFFIX PLASTIC PACKAGE CASE 751E (SO-24L) Figure 2. Pin Connections and Representative Block Diagram Figure 1. Simplified Application in a PLL Frequency Synthesized Receiver 1st Mixer Input 1 RF Input to 200 MHz 2nd LO Output 2 Figure 2. Input Match 0.01 VCC 120 pF 50 pF 10.245 MHz Ceramic Filter 455 kHz 10 k 0.1 200 k To Carrier Detect Indicator 24 2 23 3 22 4 21 5 20 MC3362 0.1 0.1 1 6 19 7 18 8 17 9 16 10 15 11 14 12 13 From PLL Phase Detector 22 1st LO Tank 2nd LO Base 4 21 1st LO Tank 2nd Mixer Output 5 Lp = 680 µH Cp = 180 pF 0.41 µH Limiter Input 7 To PLL or Prescaler Limiter 8 Decoupling Limiter 9 Decoupling 1.0 + 10 k 18 2nd Mixer Input 17 2nd Mixer Input 16 VEE 15 Comparator Output Carrier Detect 11 Quadrature Coil 12 14 Comparator Input X 13 Detector Output 0.1 Data 8.2 k 19 1st Mixer Output Meter Drive 10 VCC ORDERING INFORMATION Recovered 0.01 Audio Device MC3362DW MC3362P Operating Temperature Range TA = – 40 to +85°C Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA 20 1st LO Output X VCC 6 0.01 Ceramic Filter 10.7 MHz 23 Varicap Control 2nd LO Emitter 3 0.001 39 K 24 1st Mixer Input X Package SO–24L Plastic DIP Rev 2 1 MC3362 MAXIMUM RATING (TA = 25°C, unless otherwise noted) Pin Symbol Value Unit Power Supply Voltage (See Figure 2) 6 Vdc 6 VCC(max) VCC 7.0 Operating Supply Voltage Range (Recommended) 2.0 to 6.0 Vdc 1.0 Vrms Rating Input Voltage (VCC q 5.0 Vdc) 1, 24 Junction Temperature – Operating Ambient Temperature Range – Storage Temperature Range – V1–24 TJ TA Tstg 150 °C – 40 to + 85 °C – 65 to + 150 °C ELECTRICAL CHARACTERISTICS (VCC = 5.0 Vdc, fo = 49.7 MHz, Deviation = 3.0 kHz, TA = 25°C, Test Circuit of Figure 3, unless otherwise noted) Characteristic Pin Min Typ Max Units 6 – 4.5 7.0 mA Input for – 3.0 dB Limiting – 0.7 2.0 µVrms Input for 12 dB SINAD (See Figure 9) – 0.6 – µVrms Series Equivalent Input Impedence – 450–j350 – Ω Drain Current (Carrier Detect Low – See Figure 5) Recovered Audio (RF signal level = 10 mV) 13 – 350 – mVrms Noise Output (RF signal level = 0 mV) 13 – 250 – mVrms Carrier Detect Threshold (below VCC) 10 – 0.64 – Vdc Meter Drive Slope 10 – 100 – nA/dB Input for 20 dB (S + N)/N (See Figure 7) – 0.7 – µVrms First Mixer 3rd Order Intercept (Input) – –22 – dBm First Mixer Input Resistance (Rp) – 690 – Ω First Mixer Input Capacitance (Cp) – 7.2 – pF Conversion Voltage Gain, First Mixer – 18 – dB Conversion Voltage Gain, Second Mixer – 21 – – 1.4 – Dector Output Resistance 13 RF Input kΩ Figure 3. Test Circuit Ferronics 12–345–K 50 Ω 120 pF 10.245 MHz 2:6 50 pF 1 24 2 23 3 22 4 21 5 FL1 6 0.1 0.1 68 kΩ 180 pF VCC 0.01 10.5 Turns Coilcraft UNI–10/142 33 pF 20 MC3362 7 18 8 17 9 16 10 15 11 14 12 13 Toko RMC–2A6597HM FL1: muRata CFU455D or Toko LFC–4551 19 FL2 0.1 1.0 µF + FL2: muRata SFE10.7MA or Toko SK107M3–A0–10 VEE NOTE: See AN980 for Additional Design Information. 2 MOTOROLA ANALOG IC DEVICE DATA MC3362 Figure 5. Drain Current, Recovered Audio versus Supply Figure 4. IMeter versus Input 8.0 11 VCC 10 10 MC3362 700 ICC, Carr. Det. Low (RF in = 10 mV) 6.0 5.0 8.0 I CC (mA) I10 ( µ A) 7.0 A 9.0 800 7.0 6.0 5.0 400 3.0 300 Recovered Audio 3.0 2.0 200 1.0 100 0 2.0 – 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 – 50 – 40 – 30 RF INPUT (dBm) 0 Figure 6. Signal Levels 20 10 10 0 S + N, N, AMR (dB) 20 Second Mixer Output – 10 First Mixer Output – 20 Second Mixer Input – 30 1.0 2.0 3.0 4.0 VCC (V) 5.0 6.0 7.0 0 8.0 Figure 7. S + N, N, AMR versus Input 30 0 POWER (dBm) 500 ICC, Carr. Det. High (RF in = 0 mV) 4.0 4.0 – 40 – 50 600 V13 (mVrms) 12 First Mixer Input S+N – 10 – 20 – 30 S + N 30% AM – 40 – 50 MC3362 13 10 k – 60 0.01 N 10 k 0.01 – 60 – 70 RF Input to Transformer – 70 – 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 – 50 – 40 – 30 RF INPUT (dBm) – 80 – 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 RF INPUT (dBm) Figure 8. 1st Mixer 3rd Order Intermodulation – 50 – 40 – 30 Figure 9. Detector Output versus Frequency 4.0 20 10 0 3.0 – 10 V13 (Vdc) dB – 20 – 30 – 40 – 50 Desired Products 3rd Order Intermod. Products – 60 2.0 1.0 – 70 – 80 – 100 – 90 – 80 – 70 – 60 – 50 – 40 – 30 RF INPUT (dBm) MOTOROLA ANALOG IC DEVICE DATA – 20 – 10 0 0 – 40 – 30 10 20 – 20 – 10 0 RELATIVE INPUT FREQUENCY (kHz) 30 40 3 MC3362 Figure 10. PC Board Test Circuit (LC Oscillator Configuration Used in PLL Synthesized Receiver) 18 p RF Input 49.67 MHz 50 Ω 1000 p 1 24 0.01 0.47 µ 2 p p VCC) Varactor Control (keep 0.7 V V23 23 0.01 VCC = 2.0 to 7.0 Vdc 120 p 3 22 4 21 10.245, Fund. Mode 32 pF Load 5 20 455 kHz Cer. Filt. 0.41 µ 33 p 50 p First Local Oscillator Buffered Output 3.0 k VCC CRF1 6 19 7 18 CRF2 0.1 0.1 8 17 9 16 10 15 0.1 (This network must be tuned to exactly 10.7 MHz above or below the incoming RF signal. NOTE: The IF is rolled off above 10.7 MHz to reduce L.O. feedthrough.) to VCC CRF1 = muRata CFU 455X – the X suffix denotes 6.0 dB bandwidth. Rin = Rout = 1.5 to 2.0 kΩ. 1 CRF2 = muRata SFA10.7 MF5 or SFE10.7 or equivalent. Rin = Rout = 330 Ω . Crystal filters can be used but impedance matching will need to be added to ensure proper filter characteristics are realized. 10.7 MHz Cer. Filt. 0.1 100 k 51 k 10 k CD Adjust 10 k Carrier Detect 39 k –+ 11 14 FSK Data Output (optional) 0.001 12 13 8.2 k 455 kHz LC Resonator 0.01 Recovered Audio (MC3362) Figure 10A. Crystal Oscillator Configuration for Single Channel Application MC3362 23 22 20 k 0.68 µ VCC 300 21 0.68 µ Crystal used is series mode resonant (no load capacity specified), 3rd overtone. This method has not proven adequate for fundamental mode, 5th or 7th overtone crystals. The inductor and capacitor will need to be changed for other frequency crystals. See AN980 for further information. 20 k 38.97 MHz 4 MOTOROLA ANALOG IC DEVICE DATA MC3362 Figure 11. Component Placement View Showing Crystal Oscillator Circuit Figure 11A. LC Oscillator Component View L.O.OUT 1 .047 1 .2K 3 METER DRIVE DATA L.O.OUT GND 4 TOKO 55VLC06379GT 5 CONTROL CONTROL 330 1 3K 3 10.7MHz CF 10K 68K 3 8.2 K 2 10K 3K 2 .01 .047 CARRIER DETECT 10K 10K .1 .1 51K .41 µH 7 33p CF 455KHz .1 2 .68 µH 39 MHz XT 10.7 MHz CF .1 100K .01 .01 50p MC3362P 18p Vcc 120p 10.245MHz XT 1. .68 µH 1Kp .47 µH .01 .01 INPUT 8 REC. AUDIO NOTES: 1. Recovered Audio components may be deleted when using data output. 2. Carrier Detect components must be deleted in order to obtain linear Meter Drive output. With these components in place the Meter Drive outputs serve only to trip the Carrier Detect indicator. 3. Data Output components should be deleted in applications where only audio modulation is used. For combined audio/data applications, the 0.047 µF coupling capacitor will add distortion to 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 measure meter current (4–12 µA) through ammeter to VCC. 6. Either type of oscillator circuit may be used with any output circuit configuration. 7. LC Oscillator Coil: Coilcraft UNI 10/42 10.5 turns, 0.41 µH Crystal Oscillator circuit: trim coil, 0.68 µH. Coilcraft M1287–A. 8. 0.47 H, Coilcraft M1286–A. Input LC network used to match first mixer input impedance to 50 Ω . CIRCUIT DESCRIPTION The MC3362 is a complete FM narrowband receiver from antenna input to audio preamp output. The low voltage dual conversion design yields low power drain, excellent sensitivity and good image rejection in narrowband voice and data link applications. In the typical application (Figure 1), the first mixer amplifies the signal and converts the RF input to 10.7 MHz. This IF signal is filtered externally and fed into the second mixer, which further amplifies the signal and converts it to a 455 kHz IF signal. After external bandpass filtering, the low IF is fed into the limiting amplifier and detection circuitry. The audio is recovered using a conventional quadrature detector. Twice–IF filtering is provided internally. The input signal level is monitored by meter drive circuitry which detects the amount of limiting in the limiting amplifier. The voltage at the meter drive pin determines the state of the carrier detect output, which is active low. APPLICATIONS INFORMATION The first local oscillator can be run using a free–running LC tank, as a VCO using PLL synthesis, or driven from an external crystal oscillator. It has been run to 190 MHz.* A buffered output is available at Pin 20. The second local oscillator is a common base Colpitts type which is typically run at 10.245 MHz under crystal control. A buffered output is available at Pin 2. Pins 2 and 3 are interchangeable. The mixers are doubly balanced to reduce spurious responses. The first and second mixers have conversion gains of 18 dB and 22 dB (typical), respectively, as seen in Figure 6. Mixer gain is stable with respect to supply voltage. For both conversions, the mixer impedances and pin layout are designed to allow the user to employ low cost, readily available ceramic filters. Overall sensitivity and AM rejection are shown in Figure 7. The input level for 20 dB (S + N)/N is 0.7 µV using the two–pole post–detection filter pictured. * If the first local oscillator (Pins 21 and/or 22) is driven from a strong external source (100 mVrms), the mixer can be used to over 450 MHz. MOTOROLA ANALOG IC DEVICE DATA 5 MC3362 FSK modulation. Data rates are typically limited to 1200 baud to ensure data integrity and avoid adjacent channel “splatter.” Hysteresis is available by connecting a high valued resistor from Pin 15 to Pin 14. Values below 120 kΩ are not recommended as the input signal cannot overcome the hysteresis. The meter drive circuitry detects input signal level by monitoring the limiting amplifier stages. Figure 4 shows the unloaded current at Pin 10 versus input power. The meter drive current can be used directly (RSSI) or can be used to trip the carrier detect circuit at a specified input power. To do this, pick an RF trip level in dBm. Read the corresponding current from Figure 4 and pick a resistor such that: Following the first mixer, a 10.7 MHz ceramic band–pass filter is recommended. The 10.7 MHz filtered signal is then fed into one second mixer input pin, the other input pin being connected to VCC. Pin 6 (VCC) is treated as a common point for emitter–driven signals. The 455 kHz IF is typically filtered using a ceramic bandpass filter then fed into the limiter input pin. The limiter has 10 µV sensitivity for – 3.0 dB limiting, flat to 1.0 MHz. The output of the limiter is internally connected to the quadrature detector, including a quadrature capacitor. A parallel LC tank is needed externally from Pin 12 to VCC. A 39 kΩ shunt resistance is included which determines the peak separation of the quadrature detector; a smaller value will increase the spacing and linearity but decrease recovered audio and sensitivity. A data shaping circuit is available and can be coupled to the recovered audio output of Pin 13. The circuit is a comparator which is designed to detect zero crossings of ' R10 0.64 Vdc / I10 Hysteresis is available by connecting a high valued resistor RH between Pins 10 and 11. The formula is: Hysteresis = VCC/(RH x 10 – 7 ) dB INPUT Figure 12. Circuit Side View MC3362P GND L.O. OUT CARRIER DETECT VCC CONTROL 4I REC. AUDIO METER DRIVE DATA 4I 6 MOTOROLA ANALOG IC DEVICE DATA MOTOROLA ANALOG IC DEVICE DATA 7 2.0 kΩ 8 9 bias 21 23 bias 1 20 1.0 kΩ 1.0 kΩ 24 10 100 Ω 12 2 3 4 6 VCC bias Figure 13. Representative Schematic Diagram 17 400 Ω 16 13 bias 14 bias 18 VEE 400 Ω 15 11 1.4 kΩ 5 MC3362 7 MC3362 OUTLINE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 724–03 ISSUE D –A– 24 13 1 12 NOTES: 1. CHAMFERED CONTOUR OPTIONAL. 2. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 4. CONTROLLING DIMENSION: INCH. –B– L C –T– NOTE 1 K SEATING PLANE N E G M J F D 24 PL 0.25 (0.010) 24 PL 0.25 (0.010) M T A 13 –B– M M 12X M B M 12 24X D J 0.010 (0.25) M T A S B S F R C –T– SEATING PLANE M 22X INCHES MIN MAX 1.230 1.265 0.250 0.270 0.145 0.175 0.015 0.020 0.050 BSC 0.040 0.060 0.100 BSC 0.007 0.012 0.110 0.140 0.300 BSC 0_ 15_ 0.020 0.040 MILLIMETERS MIN MAX 31.25 32.13 6.35 6.85 3.69 4.44 0.38 0.51 1.27 BSC 1.02 1.52 2.54 BSC 0.18 0.30 2.80 3.55 7.62 BSC 0_ 15_ 0.51 1.01 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. P 0.010 (0.25) 1 T B DW SUFFIX PLASTIC PACKAGE CASE 751E–04 (SO-24L) ISSUE E –A– 24 M DIM A B C D E F G J K L M N X 45 _ DIM A B C D F G J K M P R MILLIMETERS MIN MAX 15.25 15.54 7.40 7.60 2.35 2.65 0.35 0.49 0.41 0.90 1.27 BSC 0.23 0.32 0.13 0.29 0_ 8_ 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.601 0.612 0.292 0.299 0.093 0.104 0.014 0.019 0.016 0.035 0.050 BSC 0.009 0.013 0.005 0.011 0_ 8_ 0.395 0.415 0.010 0.029 K G Motorola reserves the right to make changes without further notice to any products herein. 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