Freescale Semiconductor, Inc. Order this document by MC3356/D MC3356 Wideband FSK Receiver The MC3356 includes Oscillator, Mixer, Limiting IF Amplifier, Quadrature Detector, Audio Buffer, Squelch, Meter Drive, Squelch Status output, and Data Shaper comparator. The MC3356 is designed for use in digital data communciations equipment. • Data Rates up to 500 kilobaud Freescale Semiconductor, Inc... ARCHIVE INFORMATION • • Excellent Sensitivity: – 3 dB Limiting Sensitivity Excellent Sensitivity: 30 µVrms @ 100 MHz Highly Versatile, Full Function Device, yet Few External Parts are Required Down Converter Can be Used Independently — Similar to NE602 SEMICONDUCTOR TECHNICAL DATA P SUFFIX PLASTIC PACKAGE CASE 738 DW SUFFIX PLASTIC PACKAGE CASE 751D (SO–20L) Figure 1. Representative Block Diagram RF VCC PIN CONNECTIONS RF Ground 1 20 2 19 3 18 OSC 4 Mixer Data Shaping Comparator + 5 Ceramic Filter 6 7 – Ground Data Output VCC 16 15 Comparator – + Meter Current Limiter 17 RF Input 14 Squelch Status Hysteresis Buffer 8 13 9 12 10 11 Squelch Adjust (Meter) RF Ground 1 20 RF Input OSC Emitter 2 19 Ground OSC Collector 3 RF VCC 4 17 + Comparator Mixer Output 5 16 – Comparator IF VCC 6 15 Squelch Status Limiter Input 7 14 Squelch Control Limiter Bias 8 13 Buffered Output Limiter Bias 9 12 Demodulator Filter Quad Bias 10 11 Quad Input ORDERING INFORMATION Quadrature Detector Tank Device MC3356DW VCC 18 Data Output MC3356P Operating Temperature Range TA = – 40 to +85°C Motorola, Inc. 1996 MOTOROLA WIRELESS SEMICONDUCTOR For More Information On This Product, SOLUTIONS – RF AND IF DEVICE DATA Go to: www.freescale.com Package SO–20L Plastic DIP Rev 0 1 ARCHIVE INFORMATION • WIDEBAND FSK RECEIVER Freescale Semiconductor, Inc. MC3356 MAXIMUM RATINGS Rating Power Supply Voltage Symbol Value Unit VCC(max) 15 Vdc Operating Power Supply Voltage Range (Pins 6, 10) VCC 3.0 to 9.0 Vdc RF VCC 3.0 to 12.0 Vdc Junction Temperature TJ 150 °C Operating Ambient Temperature Range TA – 40 to + 85 °C Storage Temperature Range Tstg – 65 to + 150 °C Power Dissipation, Package Rating PD 1.25 W Operating RF Supply Voltage Range (Pin 4) ELECTRICAL CHARACTERISTICS (VCC = 5.0 Vdc, fo = 100 MHz, fosc = 110.7 MHz, ∆f = ±75 kHz, fmod = 1.0 kHz, 50 Ω source, Characteristics Min Typ Max Unit Drain Current Total, RF VCC and VCC – 20 25 mAdc Input for – 3 dB limiting – 30 – µVrms – 60 – µVrms 2.5 – – Mixer Input Resistance, 100 MHz – 260 – Ω Mixer Input Capacitance, 100 MHz – 5.0 – pF Mixer/Oscillator Frequency Range (Note 1) – 0.2 to 150 – MHz IF/Quadrature Detector Frequency Range (Note 1) – 0.2 to 50 – MHz AM Rejection (30% AM, RF Vin = 1.0 mVrms) – 50 – dB Demodulator Output, Pin 13 – 0.5 – Vrms Meter Drive – 7.0 – µA/dB Squelch Threshold – 0.8 – Vdc Input for 50 dB quieting ( S+N N ) Mixer Voltage Gain, Pin 20 to Pin 5 NOTE: 1. Not taken in Test Circuit of Figure 2; new component values required. Figure 2. Test Circuit Squelch Status Demod Out Data Output 100 MHz RF Input 3.0 k 0.1 0.01 0.01 390 k 20 RF Input L1 – 110.7 MHz, 0.4 µH L1 – 7T #22, 3/16 Form L1 – w/slug & can L2 – 10.7 MHz, 1.5 µH L2 – 20T #30, 3/16 Form L2 – w/slug & can T1 – muRata T1 – SFE10.7 MA5–Z or KYOCERA T1 – KBF10.7MN–MA 3.3 k 18 k 10 k 51 19 18 Ground Data Output 3.3 k 17 Comp(+) 16 15 Comp(–) 14 Squelch Status Squelch Control 470 pF 18 k 13 12 11 Demod Out Demod Filter Quad Input 150 pF L2 RF Gnd OSC EM. OSC COL. 1 2 3 RF VCC 4 Mixer Out Limiter Input VCC 6 5 Limiter Bias 7 8 0.01 5.6 pF Limiter Bias 9 Quad Bias 10 0.01 330 15 pF VCC L1 330 2 130 k 47 k 47 k T1 0.01 5 Vdc MOTOROLA WIRELESS SEMICONDUCTOR For More Information On This Product, Go to: www.freescale.comSOLUTIONS – RF AND IF DEVICE DATA ARCHIVE INFORMATION Freescale Semiconductor, Inc... ARCHIVE INFORMATION TA = 25°C, test circuit of Figure 2, unless otherwise noted.) Freescale Semiconductor, Inc. MC3356 Figure 3. Output Components of Signal, Noise, and Distortion Figure 4. Meter Current versus Signal Input 700 S+N+D fO = 100 MHz fm = 1.0 kHz ∆f = ± 75 kHz –10 –20 –30 N+D –40 N –50 ARCHIVE INFORMATION –60 0.01 Freescale Semiconductor, Inc... METER CURRENT, PIN 14 (µA) RELATIVE OUTPUT (dB) 0 0.1 1.0 10 600 500 400 300 200 100 0 0.010 0.1 INPUT (mVrms) 1.0 10 PIN 20 INPUT (mVrms) 100 1000 ARCHIVE INFORMATION 10 GENERAL DESCRIPTION This device is intended for single and double conversion VHF receiver systems, primarily for FSK data transmission up to 500 K baud (250 kHz). It contains an oscillator, mixer, limiting IF, quadrature detector, signal strength meter drive, and data shaping amplifier. The oscillator is a common base Colpitts type which can be crystal controlled, as shown in Figure 1, or L–C controlled as shown in the other figures. At higher VCC, it has been operated as high as 200 MHz. A mixer/oscillator voltage gain of 2 up to approximately 150 MHz, is readily achievable. The mixer functions well from an input signal of 10 µVrms, below which the squelch is unpredictable, up to about 10 mVrms, before any evidence of overload. Operation up to 1.0 Vrms input is permitted, but non–linearity of the meter output is incurred, and some oscillator pulling is suspected. The AM rejection above 10 mVrms is degraded. The limiting IF is a high frequency type, capable of being operated up to 50 MHz. It is expected to be used at 10.7 MHz in most cases, due to the availability of standard ceramic resonators. The quadrature detector is internally coupled to the IF, and a 5.0 pF quadrature capacitor is internally provided. The –3dB limiting sensitivity of the IF itself is approximately 50 µV (at Pin 7), and the IF can accept signals up to 1.0 Vrms without distortion or change of detector quiescent dc level. The IF is unusual in that each of the last 5 stages of the 6 state limiter contains a signal strength sensitive, current sinking device. These are parallel connected and buffered to produce a signal strength meter drive which is fairly linear for IF input signals of 10 µV to 100 mVrms (see Figure 4). A simple squelch arrangement is provided whereby the meter current flowing through the meter load resistance flips a comparator at about 0.8 Vdc above ground. The signal strength at which this occurs can be adjusted by changing the meter load resistor. The comparator (+) input and output are available to permit control of hysteresis. Good positive action can be obtained for IF input signals of above 30 µVrms. The 130 kΩ resistor shown in the test circuit provides a small amount of hysteresis. Its connection between the 3.3 k resistor to ground and the 3.0 k pot, permits adjustment of squelch level without changing the amount of hysteresis. The squelch is internally connected to both the quadrature detector and the data shaper. The quadrature detector output, when squelched, goes to a dc level approximately equal to the zero signal level unsquelched. The squelch causes the data shaper to produce a high (VCC) output. The data shaper is a complete ‘‘floating’’ comparator, with back to back diodes across its inputs. The output of the quadrature detector can be fed directly to either input of this amplifier to produce an output that is either at VCC or VEE, depending upon the received frequency. The impedance of the biasing can be varied to produce an amplifier which “follows” frequency detuning to some degree, to prevent data pulse width changes. When the data shaper is driven directly from the demodulator output, Pin 13, there may be distortion at Pin 13 due to the diodes, but this is not important in the data application. A useful note in relating high/low input frequency to logic state: low IF frequency corresponds to low demodulator output. If the oscillator is above the incoming RF frequency, then high RF frequency will produce a logic low (input to (+) input of Data Shaper as shown in Figures 1 and 2). APPLICATION NOTES The MC3356 is a high frequency/high gain receiver that requires following certain layout techniques in designing a stable circuit configuration. The objective is to minimize or eliminate, if possible, any unwanted feedback. MOTOROLA WIRELESS SEMICONDUCTOR For More Information On This Product, SOLUTIONS – RF AND IF DEVICE DATA Go to: www.freescale.com 3 Freescale Semiconductor, Inc. MC3356 Figure 5. Application with Fixed Bias on Data Shaper Car. Det. Out 5.0 V 0 V or 4.0 V 18 k 3.3 k 15 k 130 k RF In 1:2 10 k 0.01 3.0 k Freescale Semiconductor, Inc... ARCHIVE INFORMATION 390 k 20 19 18 RF Input Ground Data Output 470 pF 0.1 10 k 3.3 k 17 16 Comp(+) Comp(–) 15 Squelch Status 18 k 14 13 12 11 Squelch Control Demod Out Demod Filter Quad Input 150 pF MC3356 5.0 V RF Gnd OSC EM. 1 2 15 pF OSC COL. RF VCC 4 3 5.6 pF fO Mixer Out 5 0.01 4.0 V Limiter Bias 7 0.1 0.01 330 Limiter Bias 8 330 0.01 Bead + 5.0 to + 12 V Limiter Input VCC 6 9 Quad Bias 10 0.01 0.01 Bead 0.1 Cer. Fil. 10.7 MHz 180 82 APPLICATION NOTES (continued) Shielding, which includes the placement of input and output components, is important in minimizing electrostatic or electromagnetic coupling. The MC3356 has its pin connections such that the circuit designer can place the critical input and output circuits on opposite ends of the chip. Shielding is normally required for inductors in tuned circuits. The MC3356 has a separate VCC and ground for the RF and IF sections which allows good external circuit isolation by minimizing common ground paths. Note that the circuits of Figures 1 and 2 have RF, Oscillator, and IF circuits predominantly referenced to the plus supply rails. Figure 5, on the other hand, shows a suitable means of ground referencing. The two methods produce identical results when carefully executed. It is important to treat Pin 19 as a ground node for either approach. The RF input should be ‘‘grounded’’ to Pin 1 and then the input and the mixer/oscillator grounds (or RF VCC bypasses) should be connected by a low inductance path to Pin 19. IF and detector sections should also have their 4 ARCHIVE INFORMATION Data Out bypasses returned by a separate path to Pin 19. VCC and RF VCC can be decoupled to minimize feedback, although the configuration of Figure 2 shows a successful implementation on a common 5.0 V supply. Once again, the message is: define a supply node and a ground node and return each section to those nodes by separate, low impedance paths. The test circuit of Figure 2 has a 3 dB limiting level of 30 µV which can be lowered 6 db by a 1:2 untuned transformer at the input as shown in Figures 5 and 6. For applications that require additional sensitivity, an RF amplifier can be added, but with no greater than 20 db gain. This will give a 2.0 to 2.5 µV sensitivity and any additional gain will reduce receiver dynamic range without improving its sensitivity. Although the test circuit operates at 5.0 V, the mixer/oscillator optimum performance is at 8.0 V to 12 V. A minimum of 8.0 V is recommended in high frequency applications (above 150 MHz), or in PLL applications where the oscillator drives a prescaler. MOTOROLA WIRELESS SEMICONDUCTOR For More Information On This Product, Go to: www.freescale.comSOLUTIONS – RF AND IF DEVICE DATA Freescale Semiconductor, Inc. MC3356 Figure 6. Application with Self–Adjusting Bias on Data Shaper Data Out 5.0 V Car. Det. Out 0 V or 4.0 V 130 k 3.3 k 1 15 k 47 k RF In 47 k 10 k 0.01 3.3 k 1:2 470 k 20 19 18 RF Input Ground Data Output 470 pF 0.1 470 pF 17 Comp(+) 16 15 Comp(–) Squelch Status 18 k 0.1 14 Squelch Control 13 12 11 Demod Out Demod Filter Quad Input f = 10.7 1.5 µH ARCHIVE INFORMATION Freescale Semiconductor, Inc... ARCHIVE INFORMATION 150 pF APPLICATION NOTES (continued) Depending on the external circuit, inverted or noninverted data is available at Pin 18. Inverted data makes the higher frequency in the FSK signal a “one” when the local oscillator is above the incoming RF. Figure 5 schematic shows the comparator with hysteresis. In this circuit the dc reference voltage at Pin 17 is about the same as the demodulated output voltage (Pin 13) when no signal is present. This type circuit is preferred for systems where the data rates can drop to zero. Some systems have a low frequency limit on the data rate, such as systems using the MC3850 ACIA that has a start or stop bit. This defines the low frequency limit that can appear in the data stream. Figure 5 circuit can then be changed to a circuit configuration as shown in Figure 6. In Figure 6 the reference voltage for the comparator is derived from the demodulator output through a low pass circuit where τ is much lower than the lowest frequency data rate. This and similar circuits will compensate for small tuning changes (or drift) in the quadrature detector. Squelch status (Pin 15) goes high (squelch off) when the input signal becomes greater than some preset level set by the resistance between Pin 14 and ground. Hysteresis is added to the circuit externally by the resistance from Pin 14 to Pin 15. MOTOROLA WIRELESS SEMICONDUCTOR For More Information On This Product, SOLUTIONS – RF AND IF DEVICE DATA Go to: www.freescale.com 5 6 19 8 9 7 6 1 20 2 3 4 13 1.0 k 2 14 135 59 5.0 k 1.0 k 1.0 k 58 15 1.0 k 5.0 k 1.0 k 3 1.0 k 135 5 9 60 1.0 k 330 6 57 17 1.0 k 5.0 k 1.0 k 16 4 61 19 1.0 k 10 8 56 135 20 1.0 k 20 pF 1.0 k 1.0 k 62 14 55 21 1.0 k 12 11 5.0 k 135 22 50 k 66 71 63 1.0 k 69 64 72 1.0 k 1.0 k 68 20 k 20 k 24 67 135 10 k 54 23 1.0 k 50 k 1.0 k 65 5.0 k 25 20 k 73 10 k 27 70 26 15 10 k 28 10 k 10 k 35 5.0 pF 11 75 10 k 31 1.0 k 76 29 500 32 53 1.0 k 33 135 81 77 2.0 k 10 k 34 17 85 84 30 10 83 ARCHIVE INFORMATION 135 18 1.0 k 330 7 5 Figure 7. Internal Schematic ARCHIVE INFORMATION Freescale Semiconductor, Inc... 87 86 36 37 41 42 40 89 38 78 2.0 k 43 44 91 52 34 45 46 13 12 82 51 39 92 135 225 48 90 50 1.0 k 79 2.0 k 16 93 80 94 18 49 47 2.5 k 2.0 k Freescale Semiconductor, Inc. MC3356 MOTOROLA WIRELESS SEMICONDUCTOR For More Information On This Product, Go to: www.freescale.comSOLUTIONS – RF AND IF DEVICE DATA Freescale Semiconductor, Inc. MC3356 OUTLINE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 738–03 –A – 11 1 10 B C –T K ARCHIVE INFORMATION – SEATING PLANE Freescale Semiconductor, Inc... L M E G N F J 20 PL 0.25 (0.010) D 20 PL 0.25 (0.010) M T A M T B M 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° 0.51 1.01 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 ARCHIVE INFORMATION 20 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. 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 F J S MOTOROLA WIRELESS SEMICONDUCTOR For More Information On This Product, SOLUTIONS – RF AND IF DEVICE DATA Go to: www.freescale.com DIM A B C D F G J K M P R MILLIMETERS MIN MAX 12.65 12.95 7.60 7.40 2.65 2.35 0.49 0.35 0.90 0.50 1.27 BSC 0.32 0.25 0.25 0.10 7° 0° 10.05 10.55 0.75 0.25 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 7 Motorola reserves the right to make changes without further notice to any products herein. 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How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1–303–675–2140 or 1–800–441–2447 Technical Information Center: 1–800–521–6274 ARCHIVE INFORMATION Freescale Semiconductor, Inc... ARCHIVE INFORMATION Freescale Semiconductor, Inc. MC3356 JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center, 3–20–1, Minami–Azabu. Minato–ku, Tokyo 106–8573 Japan. 81–3–3440–3569 ASIA / PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, 2, Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. 852–26668334 HOME PAGE: http://www.motorola.com/semiconductors/ 8 ◊ MC3356/D MOTOROLA WIRELESS SEMICONDUCTOR For More Information On This Product, Go to: www.freescale.comSOLUTIONS – RF AND IF DEVICE DATA