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| FM Radio Transmitter & Receiver Modules T5 / R5 Features * * * * * * MINIATURE SIL PACKAGE FULLY SHIELDED DATA RATES UP TO 128KBITS/S RANGE UPTO 300 METRES SINGLE SUPPLY VOLTAGE INDUSTRY PIN COMPATIBLE QFMT5-434 * TEMP RANGE -20C to +55C * * * NO ADJUSTABLE COMPONENTS GOOD SHOCK RESISTANCE TEMPERATURE COMPENSATED RF OUTPUT QFMR5-434 * HIGH SENSITIVTY * ANALLOUGE, DIGITAL OUTPUTS * SIGNAL STRENGTH OUTPUT (RSSI) * ON BOARD AGC * SINGLE CONVERSION FM SUPER-HET * DOUBLE RF FILTERING (INC. SAW FRONT END) Applications * VEHICLE ALARM SYSTEMS * REMOTE GATE CONTROLS * GARAGE DOOR OPENERS * DOMESTIC AND COMMERCIAL SECURITY General Description The QFMT5 and QFMR5 data link modules are miniature UHF radio modules, which enable the implementation of a simple telemetry link upto 300 metres, and at data rates of up to 128Kbit/s The QFMT5 and QFMR5 modules will suit one-toone and multi-node wireless links in applications including building and car security, remote industrial process monitoring and computer networking. Because of its small size and low power requirements, these modules are ideal for use in portable battery powered wireless applications. DS305_2 April 01 (c)2001 REG No 277 4001, England. Page 1 FM Radio Transmitter & Receiver Modules Connection Diagram T5 / R5 T5 Quasar R5 1 2 3 4 5 12 34567 Figure 1: Transmitter Figure 2: Receiver Pin Description: RF GND (pin 1) RF ground pin, internally connected to pin 4 (0V). This pin should ideally be connected to the nearest ground plane (e.g. coax braid, main PCB ground plane etc.) RF OUT (pin2) 50 RF antenna output. To achieve best results the antenna impedance must match that of the module. VCC (pin 3) +Ve supply pin (3.0 to 9.0 volts). The module will generate RF when VCC is present. It is strongly recommended that a 100nF capacitor decouples the supply rail as close as possible to this pin. GND (pin 4) Supply and data ground connection, connected to pin 1. Data IN (pin 5) This input has an impedance of 47K and should ideally be driven by a CMOS logic drive or compatible. The drive circuitry should be supplied with the same supply voltage as the Tx module. RF IN (pin 1) 50 RF input from antenna, connect using shortest possible route. This input is isolated from the internal circuit using the air gap of the front end SAW RF filter RF GND (pin 2) RF ground connection, preferable connected to a solid plane. RSSI (pin 3) The Received Signal Strength Indicator provides a DC output voltage proportional to the RF input signal. The amplitude of the RSSI voltage increases with increasing RF signal strength. GND (pin 4) Connect to power supply ground. VCC (pin 5) +Ve supply pin. Operation from a 5V supply able to source6mA at less than Vp-p ripple. AF (pin 6) Audio frequency output. DATA OUT (pin 7) CMOS compatible output. This may be used to drive external decoders. Part No QFMR5-434-15 QFMR5-434-50 QFMR5-434-128 Description Receiver 433.92MHz 15Kbps Data rate Receiver 433.92MHz 50Kbps Data rate Receiver 433.92MHz 128Kbps Data rate Ordering Information: Part No QFMT5-434-5V QFMT5-434-3V QFMT5-434-128 Description Transmitter 433.92MHz 5v Transmitter 433.92MHz 3v Transmitter 433.92MHz 5v 128Kbps Data rate DS305_2 April 01 (c)2001 REG No 277 4001, England. Page 2 FM Radio Transmitter & Receiver Modules T5 / R5 Absolute Maximum Ratings: Transmitter QFMT5 Operating temperature: Storage temperature: Supply Voltage (pin 3) Data input (pin 5) RF Out (pin 2) -20C to +55C -40C to +100C 10V 10V 50V @ < 10MHz , +20dBm @ > 10MHz Electrical Characteristics: Transmitter T5 pin DC LEVELS Supply voltage Current & RF POWER 433.92 MHz Supply current @ VCC = 5V RF power 3 Min. 4.5 typ. 5.0 Max. 5.5 units Volts notes 3 2 9 12 +12 mA dBm 1 1 RF & Data nd 2 harmonic Harmonics @ > 1GHz Initial frequency accuracy Overall frequency accuracy Modulation bandwidth @ -3dB Modulation distortion (THD) Power up time to full RF Data rate Data pulse width -50 -46 50 75 10 10 50000 40 dBc dBc KHz KHz KHz % s bits/s s 1 1 Note 1: measured into a 50 impedance DS305_2 April 01 (c)2001 REG No 277 4001, England. Page 3 FM Radio Transmitter & Receiver Modules Absolute Maximum Ratings: Receiver QFMR5 Operating temperature: Storage temperature: Supply Voltage (pin 5) RF Input (pin 1) -10C to +55C -40C to +100C 7V +20dBm T5 / R5 Electrical Characteristics: Receiver R5 Pin DC LEVELS Supply voltage Supply current Supply ripple Data output high Data output low RF RF sensitivity IF Bandwidth Initial signal accuracy Max. RF input E.M.C Spurious responses upto 1GHz LO leakage, conducted LO leakage, radiated Dynamic Timings Power up to stable data (With RF signal present) Signal to stable data (With power suplly already on) Power up to valid RSSI (With RF signal present) Mark : space ratio Bit rate 5 min. 4.5 4.0 typ. 5.0 4.8 Max. 5.5 10 0.5 units Volts mA mVp-p V V notes -107 230 22 20 dBm KHz KHz dBm <60 <60 <60 dB dBm dBm tba mS tba mS tba mS 50 100 50000 % bps DS305_2 April 01 (c)2001 REG No 277 4001, England. Page 4 FM Radio Transmitter & Receiver Modules Antenna Design The design and positioning of the antenna is as crucial as the module performance itself in achieving a good wireless system range. The following will assist the designer in maximising system performance. The antenna should be kept as far away from sources of electrical interference as physically possible. If necessary, additional power line decoupling capacitors should be placed close to the module. The antenna `hot end' should be kept clear of any objects, especially any metal as this can severely restrict the efficiency of the antenna to receive power. Any earth planes restricting the radiation path to the antenna will also have the same effect. Best range is achieved with either a straight piece of wire, rod or PCB track @ 1/4 wavelength (15.5cm @ 433.92MHz). Further range may be achieved if the 1/4 wave antenna is placed perpendicular in the middle of a solid earth plane measuring at least 16cm radius. In this case, the antenna should be connected to the module via some 50 ohm characteristic impedance coax T5 / R5 Application Circuit The application circuits show how the QFMT5 transmitter and the QFMR5 receiver can easily be integrated into a system to form a wireless link. ANTENNA +5V +5V T5 1 2 3 4 5 1 2 3 4 5 6 7 8 9 A0 A1 A2 A3 A4 A5 A6 A7 VSS HT12E VDD DOUT OSC1 OSC2 TE\ AD11 AD10 AD9 AD8 18 17 16 15 14 13 12 11 10 ROSC Figure 4: QFMT5 Transmitter Application Circuit ANTENNA +5V +5V 1 2 A0 A1 A2 A3 A4 A5 A6 A7 VSS HT12D VDD VT OSC1 OSC2 DIN D11 D10 D9 D8 18 17 16 15 14 13 12 11 10 DATA OUT 4 DATA OUT 3 DATA OUT 2 DATA OUT 1 ROSC 1K5 Quasar R5 12 34567 Helical Antenna RF 3 4 5 6 7 8 9 34mm @ 433MHz 17 turns equally spaced = 5mm (inside) Figure 5: QFMR5 Receiver Application Circuit RSSI Values: The QFMR5 RSSI output provides a DC output proportional to the RF input signal. The table below shows the typical RSSI value depending on the Rf signal strength. RF Signal Strength / dBm -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 RSSI / V tba Whip Antenna RF 15.5cm @ 433MHz Figure 3: Antenna Configurations To Be Used With The QFMT5 & QFMR5 Modules DS305_2 April 01 (c)2001 REG No 277 4001, England. Page 5 FM Radio Transmitter & Receiver Modules Mechanical Dimensions 3.0 mm 31.5 mm T5 / R5 CE 10.5 mm T5 1.5mm 1 2 20.32 mm 3 4 5 3.5mm Pin spacings 2.54 mm Pin Dia 0.5mm All dimensions +/- 0.5mm Figure 6: Transmitter 49.05mm 4.65mm 17.5mm Quasar R5 pin spacing 2.54mm 12 31mm 34567 Pin spacings 2.54 mm Pin Dia 0.5mm pin 1 is 2.33mm from edge of module All dimensions +/- 0.5mm Figure 7: Receiver Should you require further assistance please contact : R F Solutions Ltd., Unit 21, Cliffe Industrial Estate, South Street, Lewes, E. Sussex. BN8 6JL, England Tel: +44 (0)1273 898 000 Email : sales@rfsolutions.co.uk Fax: +44 (0)1273 480 661 http://www.rfsolutions.co.uk Information contained in this document is believed to be accurate , however no representation or warranty is given and no liability is assumed by R.F. Solutions Ltd. With respect to the accuracy of such information. Use of R.F.Solutions as critical components in life support systems is not authorised except with express written approval from R.F.Solutions Ltd. DS305_2 April 01 (c)2001 REG No 277 4001, England. Page 6 |
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