FM Radio Transmitter & Receiver Modules T5 / R5 Features • • • • • • Miniature SIL package Fully shielded Data rates up to 128kbits/sec Range up to 300 metres Single supply voltage Industry pin compatible T5-434 • Temp range -20°C to +55°C • No adjustable components • High shock resistance • Temperature compensated RF output Applications • Vehicle alarm systems • Remote gate controls • Garage door openers • Domestic and commercial security General Description The T5 and R5 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 T5 and R5 modules will suit one-to-one and multi-node wireless links in applications including building and car security, remote industrial process monitoring and computer networking. The ‘B’ derivative parts offer a cost reduced version. DS305-8 Nov ‘05 R5-434 • High sensitivity • Analogue / Digital Outputs • Signal strength output (RSSI) • On board AGC • Single conversion FM Super-Het • Double RF filtering (inc saw front end) The receiver is based on the classical superhet single conversion architecture utilising a PLL xtal referenced oscillator which yields a highly stable IF frequency (10.7 MHz). This hence allows use of high Q bandpass filters offering excellent adjacent channel rejection and hence high interference Immunity. Because of its small size and low power requirements, these modules are ideal for use in portable battery powered wireless applications. ©2005 REG No 277 4001, England. Page 1 FM Radio Transmitter & Receiver Modules T5 / R5 Connection Diagram T5 R5 1 2 3 4 5 1 2 Figure 1: Transmitter 3 4 5 6 7 Figure 2: Receiver Pin Descriptions: 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) 50Ω 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 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. Ordering Information: RF IN (pin 1) 50Ω 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. To reduce any noise on this output ass a Add a 56pF cap from this pin to GND. Part No T5-434-9-20 Description Tx 433.92MHz 9v 20Kbps Part No T5-434-5V Tx 433.92MHz 5v 128Kbps R5-434-5-20 Rx 433.92MHz 20Kbps T5-434-5-20B T5-434-3V T5-434-3-20B Tx 433.92MHz 5v 20Kbps ‘B part’ Tx 433.92MHz 3v 50Kbps Tx 433.92MHz 3v 20Kbps ‘B part’ R5-434-5-20B Rx 433.92MHz 20Kbps ‘B part’ R5-434-5-50 Rx 433.92MHz 5V 50Kbps R5-434-5-50B Rx 433.92MHz 5V 50Kbps ‘B part’ R5-434-5-128 Rx 433.92MHz 5V 128Kbps DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Description Page 2 FM Radio Transmitter & Receiver Modules T5 / R5 Absolute Maximum Ratings: Transmitter T5 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 Please note that the ‘B’ devices are supplied without can shield. DC LEVELS Supply voltage 3V Versions Supply voltage 5V Versions Current & RF POWER Standard T5 Devices Supply current @ VCC = 5V RF power T5’B’ Devices Supply current @ VCC = 3V Supply current @ VCC = 5V RF power @ VCC = 3V RF power @ VCC = 5V pin Min. typ. Max. units 3 3 2 4.5 3.0 5.0 4 5.5 Volts Volts 9 12 +12 mA dBm 1 1 8 9.5 +7 +10 mA mA dBm dBm 1 1 1 1 -50 -46 ±50 ±75 dBc dBc KHz KHz 1 1 10 KHz % ms 3 2 3 3 2 2 4 5.5 3 7 RF & Data 2nd harmonic Harmonics @ > 1GHz Initial frequency accuracy Overall frequency accuracy Modulation bandwidth @ -3dB Modulation distortion (THD) Power up time to full RF 6 8 1 Standard T5 Devices Data rate Standard Data pulse width 40 T5’B’ Devices Data rate Standard Data pulse width 500 128,000 bits/s µs 20,000 bits/s µs notes Notes 1. Measured into a 50Ω impedance 2. The limit for European spec EN300-220 is –36dBm DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 3 FM Radio Transmitter & Receiver Modules T5 / R5 Absolute Maximum Ratings: Receiver R5 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: Standard Receiver R5 DC LEVELS Supply voltage Supply current Supply ripple Data output high Data output low min. typ. Max. units 4.5 5.0 6 =>4.0 <=0.5 5.5 Volts mA mVp-p V V - 10 RF RF sensitivity IF Bandwidth Initial signal accuracy Max. RF input -105 230 ±25 20 dBm KHz KHz dBm E.M.C Spurious responses upto 1GHz LO leakage, conducted LO leakage, radiated Image Rejection <60 <60 <60 50 dB dBm dBm dBm notes 1 Dynamic Timings Power up to stable data (With RF signal present) Signal to stable data (With power supply already on) 30 5 5 35 7 7 mS mS mS 20Kbps Part 50Kbps Part 128Kbps Part 0.5 2.5 1 1 mS mS mS 20Kbps Part 50Kbps Part 128Kbps Part 1 mS All Versions 6000 700 300 uS US uS 20Kbps Part 50Kbps Part 128Kbps Part Power up to valid RSSI (With RF signal present) Data Pulse Widths (SeeNote 2) 50 20 7 1. IF bandwidth available down to 27KHz 2. The data slicer is optimised for a 50:50 duty cycle, hence for reliable communications data should be encoded using a suitable scheme such as Manchester Encoding, though pulse width modulation up to 30:70/70:30 can also be utilised. DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 4 FM Radio Transmitter & Receiver Modules T5 / R5 Electrical Characteristics: Receiver R5 ‘B’ Parts Please note that the ‘B’ devices are supplied without can shield. min. typ. DC LEVELS Supply voltage 4.5 5.0 Supply current 6 Supply ripple Data output high =>4.0 Data output low <=0.5 Max. units 5.5 Volts mA mVp-p V V 10 RF RF sensitivity IF Bandwidth Initial signal accuracy Max. RF input -103 230 ±22 20 dBm KHz KHz dBm E.M.C Spurious responses upto 1GHz LO leakage, conducted LO leakage, radiated Image Rejection <60 <60 <60 60 dB dBm dBm dBm Dynamic Timings Power up to stable data (With RF signal present) 30 5 Signal to stable data (With power supply already on) 50 20 1 35 7 mS mS 20Kbps Part 64Kbps Part 2.5 1 mS mS 20Kbps Part 64Kbps Part 1 mS All Versions 6000 700 uS uS 20Kbps Part 50Kbps Part Power up to valid RSSI (With RF signal present) Data Pulse Widths (SeeNote 2) notes 3. IF bandwidth available down to 27KHz 4. The data slicer is optimised for a 50:50 duty cycle, hence for reliable communications data should be encoded using a suitable scheme such as Manchester Encoding, though pulse width modulation up to 30:70/70:30 can also be utilised. DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 5 FM Radio Transmitter & Receiver Modules T5 / R5 Antenna Design RSSI Values: 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 R5 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. The circuit diagram shows how a carrier detect can be obtained from the RSSI pin on the receiver module. 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 @ 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 RF Signal Strength / dBm RSSI / V RF Signal Strength / dBm -120 -110 -100 -90 -80 -70 RSSI / V 1.27 1.33 1.49 1.74 1.99 2.3 -60 -50 -40 2.56 2.63 2.63 Carrier Detect circuit The R5 RSSI output provides a DC output proportional to the RF input signal. In order to generate a Carrier Detect (as a logic level) The following circuit may be used. Helical Antenna 5V RF 10 K ohm 34mm @ 433MHz 17 turns equally spaced ∅ = 5mm (inside) RSSI OUT PIN 3 CD 39 K ohm Whip Antenna 62 K ohm RF 15.5cm @ 433MHz GND Figure 3: Antenna Configurations To Be Used With The T5 & R5 Modules DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 6 FM Radio Transmitter & Receiver Modules T5 / R5 Application Circuits The following circuits show a remote control system with ‘self learning feature’ for more information please see Datasheet DS600 Transmitter Circuit Vcc Sw 4 Sw 3 Sw 2 Transmit LED Sw 1 Pull Up Resistor 2K2 T5 3 4 5 1 2 1 2 3 4 S0 Vcc S1 LED RF600E S2 DO S3 GND 8 Serial Data Output 7 6 5 BC848 10K Receiver Circuit Vcc O/P 1 O/P 2 RF Receiver 12 18 1KΩ OP2 OP3 OP1 OP4 16 15 Status LED L Option Links LB N/C Vcc N/C 14 Vcc 13 M O/P 3 2 17 3 4 5 6 7 1 RF600D GND Sleep ECS LKIN ECLK SD1 EDAT LRN IN 12 11 10 O/P 4 Transmitter Low Battery 3 4 15KΩ 5 6 FM / IR 7 Fit One Resistor Only 8 9 22KΩ AM 22KΩ 1KΩ Learn Switch Data Input Serial Data Output DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 7 FM Radio Transmitter & Receiver Modules T5 / R5 Mechanical Dimensions 3.0 mm 31.5 mm 10.5 mm T5 20.32 mm 1 1.5mm 2 3 4 Pin spacings 2.54 mm Pin Dia 0.5mm All dimensions +/- 0.5mm 5 3.5mm Figure 6: Transmitter 48 mm 4.65mm 17.5mm R5 pin spacing 2.54mm 1 2 3 4 5 6 7 30.48mm 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. DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 8