Order this document by MC3335/D . . . includes dual FM conversion with Oscillators, Mixers, Quadrature Discriminator, and Meter Drive/Carrier Detect Circuitry. The MC3335 also has a comparator circuit for FSK detection. • Complete Dual Conversion Circuitry • • • • • • • • • • Low Voltage: VCC = 2.0 to 6.0 Vdc LOW POWER DUAL CONVERSION FM RECEIVER Low Drain Current (Typical 3.6 mA with VCC = 3.0 Vdc) SEMICONDUCTOR TECHNICAL DATA Excellent Sensitivity: – 3.0 dB Input Limiting = 0.7 µV Externally Adjustable Carrier Detect Function Separate Data Shaping Output Circuitry Data Rate Up to 35000 Baud Detectable P SUFFIX PLASTIC PACKAGE CASE 738 60 dB RSSI Range Low Number of External Parts Required Manufactured in Motorola′s MOSAIC Process Technology MC13135 is Preferred for New Designs DW SUFFIX PLASTIC PACKAGE CASE 751D (SO–20L) PIN CONNECTIONS Simplified Application as a Fixed Receiver 0.01 RF Input 49.7 MHz 0.01 1 20 2 19 120 pF 50 pF 17 4 2nd Lo Emitter 2 19 1st Lo Tank 2nd Lo Base 3 18 1st Lo Tank Ceramic Filter 10.7 MHz VCC 17 1st Mixer Output VCC 5 16 2nd Mixer Input Limiter Input 6 Ceramic Filter 455 kHz 7 1.0 + 16 5 VCC 6 0.1 20 1st Mixer Input 2nd Mixer Output 4 18 3 10.245 MHz 0.41 µH 33 pF 1st Mixer Input 1 Limiter Decoupling 8 15 Limiter Limiter Decoupling 7 10 k 0.1 14 15 VEE LIMITER 14 Comparator Output 13 Comparator Input Meter Drive 9 12 Detector Output Carrier Detect 10 11 Quadrature Coil Data 0.1 8 13 9 12 10 11 0.1 200 k 10 k To Carrier Detect Indicator 0.001 Recovered Audio 39 K ORDERING INFORMATION Device Lp = 660 µH Cp = 180 pF MC3335DW MC3335P Operating Temperature Range TA = – 40 to +85°C Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA Package SO–20 Plastic DIP Rev 5 1 MC3335 MAXIMUM RATINGS (TA = 25°C, unless otherwise noted) Rating Pin Symbol Value Unit Power Supply Voltage 5 7.0 Vdc Operating Supply Voltage Range (Recommended) 5 VCC(max) VCC 2.0 to 6.0 Vdc 1,20 V1–20 1.0 Vrms Junction Temperature – °C – – 40 to + 85 °C Storage Temperature Range – TJ TA Tstg 150 Operating Ambient Temperature Range – 65 to + 150 °C Input Voltage (VCC > 5.0 Vdc) ELECTRICAL CHARACTERISTICS (VCC = 5.0 Vdc, fo = 49.7 MHz, Deviation = 3.0 kHz, TA = 25°C, test circuit of Figure 2, unless otherwise noted.) Characteristic Pin Min Typ Max Unit 5 – 4.5 7.0 mAdc Input for – 3.0 dB Limiting – – 0.7 2.0 µVrms Recovered Audio (RF Signal Level = 1.0 mV) 12 – 250 – mVrms Noise Output (RF Signal Level = 0 mV) 12 – 250 – mVrms Carrier Detect Threshold (below VCC) 9 – 0.64 – Vdc Meter Drive Slope 9 – 100 – µA/dB Input for 20 dB (S + N/N) – – 1.3 – µVrms First Mixer 3rd Order Intercept (Input) – – – 20 – dBm First Mixer Input Resistance (Rp) – – 690 – Ω First Mixer Input Capacitance (Cp) – – 7.2 – pF First Mixer Conversion Voltage Gain – – 18 – dB Second Mixer Conversion Voltage Gain – – 21 – dB Detector Output Resistance 12 – 1.4 – kΩ Drain Current Figure 1. Test Circuit 2.6 RF Input 49.7 MHz 0.1 VCC 1 20 2 19 3 18 4 17 5 VCC 16 6 15 7 14 8 13 9 12 20 k 56 pF 1.4 39 pF 10.245 MHz Ceramic Filter 455 kHz 39 MHz 300 Ceramic Filter 10.7 MHz 1.0 + 0.1 0.1 0.1 0.1 0.01 RA 7.5 k 200 k 10 68 k 11 10 k To Carrier Detect Indicator 2 Lp = 660 µH Cp = 180 pF MOTOROLA ANALOG IC DEVICE DATA MC3335 Figure 3. Drain Current, Recovered Audio versus Supply Figure 2. Imeter versus Input 11 10 8.0 VCC A 9 MC3335 700 ICC, Carr. Det. Low (RF in = 10 mV) 6.0 9.0 I CC (mA) 8.0 I 9 (µ A) 800 7.0 7.0 6.0 5.0 4.0 3.0 2.0 – 130 – 120 – 110 – 100 – 90 5.0 500 400 4.0 Recovered Audio 3.0 200 1.0 100 0 – 80 – 70 – 60 – 50 300 2.0 – 40 – 30 0 2.0 1.0 4.0 3.0 RF INPUT (dBm) 5.0 6.0 7.0 0 8.0 VCC (V) Figure 4. (S + N), N of 2nd Mixer Figure 5. (S + N)/N versus Input 20 10 20 10 S+N 0 S+N 0 – 10 – 10 (S + N)/N (dB) (S + N)/N (dB) 600 ICC, Carr. Det. High (RF in = 0 mV) V12 (mVrms) 12 – 20 – 30 – 40 – 50 – 60 – 20 – 30 N – 40 – 50 N – 60 – 70 12 7.5 k MC3335 0.01 – 70 – 80 – 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 – 50 – 80 – 130 – 120 – 110 – 100 – 90 – 40 – 30 RF INPUT (dBm) – 80 – 70 – 60 – 50 – 40 – 30 RF INPUT (dBm) Figure 6. 1st Mixer 3rd Order Intermodulation Figure 7. Detector Output versus Frequency 4.0 20 10 0 3.0 – 10 – 30 – 40 V12 (Vdc) (dB) – 20 Desired Products 3rd Order Intermod. Products – 50 – 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 – 20 – 10 0 10 20 30 40 RELATIVE INPUT FREQUENCY (kHz) 3 MC3335 CIRCUIT DESCRIPTION The MC3335 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 diagram, 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. At higher VCC values (6.0 to 7.0 V), it has been run to 170 MHz. The second local oscillator is a common base Colpitts type which is typically run at 10.245 MHz under crystal control. 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. 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 is shown in Figure 5. The input level for 20 dB (S + N)/N is 1.3 µV using the two–pole post–detection filter as demonstrated. 4 Following the first mixer, a 10.7 MHz ceramic bandpass 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 5 (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 11 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 12. The circuit is a comparator which is designed to detect zero crossings of FSK modulation. Data rates of up to 35000 baud are detectable using the typical application. Hysteresis is available by connecting a high–valued resistor from Pin 13 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 of the limiting amplifier stages. Figure 2 shows the unloaded current at Pin 9 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 2 and pick a resistor such that: R9 = 0.64 Vdc / I9 Hysteresis is available by connecting a high–valued resistor RH between Pin 9 and 10. The formula is: Hysteresis = VCC/(RH x 10 – 7) dB MOTOROLA ANALOG IC DEVICE DATA MC3335 OUTLINE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 738–03 –A – 20 11 1 10 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION “L” TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIMENSION “B” DOES NOT INCLUDE MOLD FLASH. 5. 738–02 OBSOLETE, NEW STANDARD 738–03. B C –T L K – SEATING PLANE M E G N F J 20 PL 0.25 (0.010) D 20 PL 0.25 (0.010) M T A M M T B M DIM A B C D E F G J K L M N MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0° 15° 1.01 0.51 INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 0° 15° 0.020 0.040 DW SUFFIX PLASTIC PACKAGE CASE 751D–03 (SO–20L) NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. 751D–01, AND –02 OBSOLETE, NEW STANDARD 751D–03. –A – 20 11 1 10 –B – 0.25 (0.010) P M B M 10 PL G R X 45° C –T SEATING – PLANE M K D 20 PL 0.25 (0.010) M T B S A S MOTOROLA ANALOG IC DEVICE DATA F J DIM A B C D F G J K M P R MILLIMETERS MIN MAX 12.65 12.95 7.40 7.60 2.35 2.65 0.35 0.49 0.50 0.90 1.27 BSC 0.25 0.32 0.10 0.25 0° 7° 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.499 0.510 0.292 0.299 0.093 0.104 0.014 0.019 0.020 0.035 0.050 BSC 0.010 0.012 0.004 0.009 7° 0° 0.395 0.415 0.010 0.029 5 MC3335 Motorola reserves the right to make changes without further notice to any products herein. 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