Order this document by MC3357/D . . . includes Oscillator, Mixer, Limiting Amplifier, Quadrature Discriminator, Active Filter, Squelch, Scan Control, and Mute Switch. The MC3357 is designed for use in FM dual conversion communications equipment. • Low Drain Current (3.0 mA (Typical) @ VCC = 6.0 Vdc) SEMICONDUCTOR TECHNICAL DATA Recommend MC3372 for Replacement/Upgrade P SUFFIX PLASTIC PACKAGE CASE 648 D SUFFIX PLASTIC PACKAGE CASE 751B (SO–16) PIN CONNECTIONS Figure 1. Representative Block Diagram VCC 1 2 455 kHz Filter 3 Squelch Trigger With Hysteresis 10.245 MHz 4 10.7 MHz Input 15 Ground 14 Audio Mute 13 Scan Control 12 5 6 16 Limiter Amp Noise Detector RF 1 16 Input 2 15 Gnd Mixer Output 3 14 Mute VCC 4 13 Control Limiter Input 5 12 Input Decoupling 6 11 Output Limiter Output 7 10 Input Quad Input 8 Crystal Osc. Mixer • • Excellent Sensitivity: Input Limiting Voltage – (– 3.0 dB) = 5.0 µV (Typical) Low Number of External Parts Required Oscillator • LOW POWER FM IF Audio Scan Squelch Filter Filter Demodulator 9 Output 11 Active Filter Amp 7 + _ Z1 10 2.0 V Z2 8 Demodulator Quad Coil 9 Audio ORDERING INFORMATION Device MC3357D MC3357P Operating Temperature Range TA = – 30 to +70°C Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA Package SO–16 Plastic DIP Rev 5 1 MC3357 MAXIMUM RATINGS (TA = 25°C, unless otherwise noted) Rating Pin Symbol Value Unit Power Supply Voltage 4 12 Vdc Operating Supply Voltage Range 4 VCC(max) VCC 4 to 8 Vdc Detector Input Voltage 8 – 1.0 Vp–p Input Voltage (VCC 16 V16 V14 1.0 –0.5 to 5.0 VRMS Vpk q 6.0 Volts) Mute Function 14 Junction Temperature – Operating Ambient Temperature Range – Storage Temperature Range – TJ TA Tstg 150 °C – 30 to + 70 °C – 65 to + 150 °C ELECTRICAL CHARACTERISTICS (VCC = 6.0 Vdc, fo = 10.7 MHz, ∆f = ± 3.0 kHz, fmod = 1.0 kHz, TA = 25°C, unless otherwise noted.) Characteristic Pin Min Typ Max Unit Drain Current Squelch Off Drain Current Squelch On 4 – – 2.0 3.0 – 5.0 mA Input Limiting Voltage (– 3 dB Limiting) 16 – 5.0 10 µV Detector Output Voltage 9 – 3.0 – Vdc Detector Output Impedance – – 400 – Ω Recovered Audio Output Voltage (Vin = 10 mV) 9 200 350 – mVrms Filter Gain (10 kHz) (Vin = 5 mV) Filter Output Voltage – 40 46 – dB 11 1.8 2.0 2.5 Vdc Trigger Hysteresis – – 100 – mV Mute Function Low 14 – 15 50 Ω Mute Function High 14 1.0 10 – MΩ Scan Function Low (Mute Off) (V12 = 2 Vdc) 13 – 0 0.5 Vdc Scan Function High (Mute On) (V12 = Gnd) 13 5.0 – – Vdc Mixer Conversion Gain 3 – 20 – dB Mixer Input Resistance 16 – 3.3 – kΩ Mixer Input Capacitance 16 – 2.2 – pF 2 MOTOROLA ANALOG IC DEVICE DATA MC3357 VCC = 6.0 Vdc Figure 2. Test Circuit 0.1 µF 10.245 MHz 100 nF 1 50 pF 120 pF Input 10.7 MHz 16 51 2 15 3 14 4 13 5 12 6 11 2.0 k muRata CFU 455 D 10 k 455 kHz Filter 10 k 100 nF 2.0 k 2.0 Vdc 100 nF 47 k 7 10 8 9 Op Amp Output 390 k 1.0 k 1.0 µF + Filter In 10 pF 51 k 8.2 k Audio Out 0.01 µF 20 pF LP = 1.0 mH CP = 100 pF RP = 100 kΩ CIRCUIT DESCRIPTION The MC3357 is a low power FM IF circuit designed primarily for use in voice communication scanning receivers. The mixer–oscillator combination converts the input frequency (e.g., 10.7 MHz) down to 455 kHz, where, after external bandpass filtering, most of the amplification is done. The audio is recovered using a conventional quadrature FM detector. The absence of an input signal is indicated by the presence of noise above the desired audio frequencies. This “noise band” is monitored by an active filter and a detector. A squelch trigger circuit indicates the presence of a noise (or a tone) by an output which can be used to control scanning. At the same time, an internal switch is operated which can be used to mute the audio. The oscillator is an internally–biased Colpitts type with the collector, base, and emitter connections at Pins 4, 1, and 2 respectively. A crystal can be used in place of the usual coil. The mixer is doubly–balanced to reduce spurious responses. The input impedance at Pin 16 is set by a 3.0 kΩ internal biasing resistor and has low capacitance, allowing the circuit to be preceded by a crystal filter. The collector output at Pin 3 must be dc connected to B +, below which it can swing 0.5 V. After suitable bandpass filtering (ceramic or LC), the signal goes to the input of a five–stage limiter at Pin 5. The output of the limiter at Pin 7 drives a multiplier, both internally directly, MOTOROLA ANALOG IC DEVICE DATA and externally through a quadrature coil, to detect the FM. The output at Pin 7 is also used to supply dc feedback to Pin 5. The other side of the first limiter stage is decoupled at Pin 6. The recovered audio is partially filtered, then buffered, giving an impedance of around 400 Ω at Pin 9. The signal still requires de–emphasis, volume control and further amplification before driving a loudspeaker. A simple inverting op amp is provided with an output at Pin 11 providing dc bias (externally) to the input at Pin 10 which is referred internally to 2.0 V. A filter can be made with external impedance elements to discriminate between frequencies. With an external AM detector, the filtered audio signal can be checked for the presence of noise above the normal audio band, or a tone signal. This information is applied to Pin 12. An external positive bias to Pin 12 sets up the squelch trigger circuit such that Pin 13 is low at an impedance level of around 60 kΩ , and the audio mute (Pin 14) is open circuit. If Pin 12 is pulled down to 0.7 V by the noise or tone detector, Pin 13 will rise to approximately 0.5 Vdc below supply where it can support a load current of around 500 µA and Pin 14 is internally short–circuited to ground. There is 100 mV of hysteresis at Pin 12 to prevent jitter. Audio muting is accomplished by connecting Pin 14 to a high–impedance ground–reference point in the audio path between Pin 9 and the audio amplifier. 3 4 5 100 k 16 2 15 k 100 k 31 30 29 28 27 8 10 k 30 k 33 32 10 k 9 6.2 k 34 30 k 3 4 10 k 35 5.0 k 3.0 k 10 k 10 k 10 33 k 36 5 30 k 10 k 10 k 37 11 33 k 38 10 k 15 k 15 k 30 k 10 k C1 20 k 39 14 10 k 33 k 40 20 k 15 3 10 k 41 10 33 k 42 17 10 k 50 k 10 k 21 43 16 Figure 3. Circuit Schematic 44 50 k 10 k 45 18 22 120 k 48 46 8 19 20 49 56 12 52 11 50 22 k 51 220 k 23 57 53 24 470 15 k 50 k C2 50 k 58 26 100 k 54 50 k 10 k 55 25 9 15 14 13 4 MC3357 MOTOROLA ANALOG IC DEVICE DATA MC3357 OUTLINE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 648–08 ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. –A– 16 9 1 8 B F C DIM A B C D F G H J K L M S L S –T– SEATING PLANE K H G D M J 16 PL 0.25 (0.010) M T A M MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01 D SUFFIX PLASTIC PACKAGE CASE 751B–05 (SO–16) ISSUE J –A– 16 9 –B– 1 P 0.25 (0.010) 8 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 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 8 PL M B S G R F X 45 _ K C –T– INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 SEATING PLANE D 16 PL 0.25 (0.010) M T B S A MOTOROLA ANALOG IC DEVICE DATA S M J DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019 5 MC3357 Motorola reserves the right to make changes without further notice to any products herein. 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