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 -20°C to +55°C • 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 Because of its small size and low power requirements, these modules are ideal for use in portable battery powered wireless applications. 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. DS305_2 April 01 2001 REG No 277 4001, England. Page 1 FM Radio Transmitter & Receiver Modules T5 / R5 Connection Diagram T5 Quasar R5 1 2 3 4 5 1 2 Figure 1: Transmitter 3 4 5 6 7 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 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 OUT (pin2) 50Ω RF antenna output. To achieve best results the antenna impedance must match that of the module. RF GND (pin 2) RF ground connection, preferable connected to a solid plane. 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 47KΩ 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. 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. Ordering Information: Part No QFMT5-434-5V Description Transmitter 433.92MHz 5v QFMT5-434-3V QFMT5-434-128 Transmitter 433.92MHz 3v Transmitter 433.92MHz 5v 128Kbps Data rate Part No QFMR5-434-15 QFMR5-434-50 QFMR5-434-128 DS305_2 April 01 2001 REG No 277 4001, England. Description Receiver 433.92MHz 15Kbps Data rate Receiver 433.92MHz 50Kbps Data rate Receiver 433.92MHz 128Kbps Data rate Page 2 FM Radio Transmitter & Receiver Modules T5 / R5 Absolute Maximum Ratings: Transmitter QFMT5 Operating temperature: Storage temperature: -20°C to +55°C -40°C to +100°C Supply Voltage (pin 3) Data input (pin 5) RF Out (pin 2) 10V 10V ±50V @ < 10MHz , +20dBm @ > 10MHz Electrical Characteristics: Transmitter T5 DC LEVELS Supply voltage pin Min. typ. Max. units notes 3 4.5 5.0 5.5 Volts 9 12 +12 mA dBm 1 1 -50 -46 ±50 ±75 dBc dBc KHz KHz 1 1 10 KHz % µs Current & RF POWER 433.92 MHz Supply current @ VCC = 5V RF power 3 2 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 10 50000 40 bits/s µs Note 1: measured into a 50Ω impedance DS305_2 April 01 2001 REG No 277 4001, England. Page 3 FM Radio Transmitter & Receiver Modules T5 / R5 Absolute Maximum Ratings: Receiver QFMR5 Operating temperature: Storage temperature: -10°C to +55°C -40°C to +100°C Supply Voltage (pin 5) RF Input (pin 1) 7V +20dBm Electrical Characteristics: Receiver R5 DC LEVELS Supply voltage Supply current Supply ripple Data output high Data output low Pin min. typ. Max. units 5 4.5 5.0 4.8 - 5.5 Volts mA mVp-p V V 4.0 10 0.5 RF RF sensitivity IF Bandwidth Initial signal accuracy Max. RF input -107 230 ±22 20 dBm KHz KHz dBm E.M.C Spurious responses upto 1GHz LO leakage, conducted LO leakage, radiated <60 <60 <60 dB dBm dBm tba mS Signal to stable data (With power suplly already on) tba mS Power up to valid RSSI (With RF signal present) tba mS Dynamic Timings Power up to stable data (With RF signal present) Mark : space ratio Bit rate DS305_2 April 01 50 100 2001 REG No 277 4001, England. 50000 notes % bps Page 4 FM Radio Transmitter & Receiver Modules T5 / R5 Antenna Design Application Circuit 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 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 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. 1 1 2 3 4 5 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 @ ¼ wavelength (15.5cm @ 433.92MHz). Further range may be achieved if the ¼ 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 6 7 8 9 DOUT A2 OSC1 A3 OSC2 A4 TE\ A5 AD11 A6 AD10 A7 AD9 VSS AD8 5 6 7 8 9 18 17 ROSC 16 15 14 13 12 11 10 +5V A0 VDD A1 VT A2 OSC1 A3 OSC2 A4 DIN A5 D11 A6 D10 A7 D9 VSS D8 18 1K5Ω 17 16 ROSC Quasar R5 1 2 3 4 5 6 7 15 14 13 12 11 10 DATA OUT 4 DATA OUT 3 DATA OUT 2 DATA OUT 1 HT12D 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. Whip Antenna RF 15.5cm @ 433MHz Figure 3: Antenna Configurations To Be Used With The QFMT5 & QFMR5 Modules DS305_2 April 01 5 ANTENNA 4 17 turns equally spaced ∅ = 5mm (inside) 4 +5V 3 34mm @ 433MHz VDD A1 3 Figure 4: QFMT5 Transmitter Application Circuit 2 RF A0 2 HT12E 1 Helical Antenna T5 RF Signal Strength / dBm -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 2001 REG No 277 4001, England. RSSI / V tba Page 5 FM Radio Transmitter & Receiver Modules T5 / R5 Mechanical Dimensions 3.0 mm 31.5 mm CE 10.5 mm T5 1.5mm 1 2 3 4 5 3.5mm 20.32 mm Pin spacings 2.54 mm Pin Dia 0.5mm All dimensions +/- 0.5mm Figure 6: Transmitter 4.65mm 49.05mm 17.5mm Quasar R5 pin spacing 2.54mm 1 2 31mm 3 4 5 6 7 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 Fax: +44 (0)1273 480 661 Email : [email protected] 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 2001 REG No 277 4001, England. Page 6