DS305-9 RFSOLUTIONS | Alldatasheet

Document overview

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Technical content

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. 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.

FM Radio Transmitter & Receiver Modules T5 / R5 DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 3 Absolute Maximum Ratings: Transmitter T5 Operating temperature: -20 °C to +55°C Storage temperature: -40 °C to +100°C Supply Voltage (pin 3) 10V Data input (pin 5) 10V RF Out (pin 2) ±50V @ < 10MHz , +20dBm @ > 10MHz Electrical Characteristics: Transmitter T5 Please note that the ‘B’ devices are supplied without can shield. pin Min. typ. Max. units notes DC LEVELS Supply voltage 3V Versions 3 2 3.0 4 Volts Supply voltage 5V Versions 3 4.5 5.0 5.5 Volts Current & RF POWER Standard T5 Devices Supply current @ VCC = 5V 3 12 mA 1 RF power 2 9 +12 dBm 1 T5’B’ Devices Supply current @ VCC = 3V 3 4 6 8 mA 1 Supply current @ VCC = 5V 3 5.5 8 9.5 mA 1 RF power @ VCC = 3V 2 3 +7 dBm 1 RF power @ VCC = 5V 2 7 +10 dBm 1 RF & Data 2nd harmonic -50 dBc 1 Harmonics @ > 1GHz -46 dBc 1 Initial frequency accuracy ±50 KHz Overall frequency accuracy ±75 KHz Modulation bandwidth @ -3dB 10 KHz Modulation distortion (THD) % Power up time to full RF 1 ms Standard T5 Devices Data rate Standard 128,000 bits/s Data pulse width 40 µs T5’B’ Devices Data rate Standard 20,000 bits/s Data pulse width 500 µs Notes 1. Measured into a 50Ω impedance 2. The limit for European spec EN300-220 is –36dBm

FM Radio Transmitter & Receiver Modules T5 / R5 DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 4 Absolute Maximum Ratings: Receiver R5 Operating temperature: -10 °C to +55°C Storage temperature: -40 °C to +100°C Supply Voltage (pin 5) 7V RF Input (pin 1) +20dBm Electrical Characteristics: Standard Receiver R5 min. typ. Max. units notes DC LEVELS Supply voltage 4.5 5.0 5.5 Volts Supply current 6 mA Supply ripple - - 10 mV p-p Data output high =>4.0 V Data output low <=0.5 V RF RF sensitivity -105 dBm IF Bandwidth 230 KHz 1 Initial signal accuracy ±25 KHz Max. RF input 20 dBm E.M.C Spurious responses upto 1GHz <60 dB LO leakage, conducted <60 dBm LO leakage, radiated <60 dBm Image Rejection 50 dBm Dynamic Timings 30 35 mS 20Kbps Part 5 7 mS 50Kbps Part Power up to stable data (With RF signal present) 5 7 mS 128Kbps Part 2.5 mS 20Kbps Part 1 mS 50Kbps Part Signal to stable data (With power supply already on) 0.5 1 mS 128Kbps Part Power up to valid RSSI (With RF signal present) 1 mS All Versions 50 6000 uS 20Kbps Part 20 700 US 50Kbps Part Data Pulse Widths (SeeNote 2) 7 300 uS 128Kbps Part 1. IF bandwidth available down to 27KHz 2. The data slicer is optimised for a 50:50 duty cy cle, 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.

FM Radio Transmitter & Receiver Modules T5 / R5 DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 5 Electrical Characteristics: Receiver R5 ‘B’ Parts Please note that the ‘B’ devices are supplied without can shield. min. typ. Max. units notes DC LEVELS Supply voltage 4.5 5.0 5.5 Volts Supply current 6 mA Supply ripple - - 10 mV p-p Data output high =>4.0 V Data output low <=0.5 V RF RF sensitivity -103 dBm IF Bandwidth 230 KHz 1 Initial signal accuracy ±22 KHz Max. RF input 20 dBm E.M.C Spurious responses upto 1GHz <60 dB LO leakage, conducted <60 dBm LO leakage, radiated <60 dBm Image Rejection 60 dBm Dynamic Timings 30 35 mS 20Kbps Part Power up to stable data (With RF signal present) 5 7 mS 64Kbps Part 2.5 mS 20Kbps Part Signal to stable data (With power supply already on) 1 mS 64Kbps Part Power up to valid RSSI (With RF signal present) 1 mS All Versions 50 6000 uS 20Kbps Part Data Pulse Widths (SeeNote 2) 20 700 uS 50Kbps Part 3. IF bandwidth available down to 27KHz 4. The data slicer is optimised for a 50:50 duty cy cle, 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.

FM Radio Transmitter & Receiver Modules T5 / R5 DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 6 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 meta l 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 Figure 3: Antenna Configurations To Be Used With The T5 & R5 Modules RSSI Values: 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. T he circuit diagram shows how a carrier detect can be obtained from the RSSI pin on the receiver module. RF Signal Strength / dBm RSSI / V RF Signal Strength / dBm RSSI / V -120 1.27 -110 1.33 -100 1.49 -90 1.74 -80 1.99 -70 2.3 -60 2.56 -50 2.63 -40 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. RF RF Helical Antenna Whip Antenna 34mm @ 433MHz 17 turns equally spaced ∅ = 5mm (inside) 15.5cm @ 433MHz CD GND

10 K ohm

39 K ohm

62 K ohm

FM Radio Transmitter & Receiver Modules T5 / R5 DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 7 Application Circuits The following circuits show a remote control system with ‘self learning feature’ for more information please see Datasheet DS600 Transmitter Circuit Receiver Circuit RF600E LED DO GND Vcc Sw 1 Serial Data Output Vcc Sw 2Sw 3Sw 4 Transmit LED 2K2 10K Pull Up Resistor BC848 1 2 3 4 5 RF600D N/C 118 OP3 OP4 GND ECS ECLK EDAT IN OP1 Vcc Sleep LKIN SD1 LRN OP2 LB Vcc 1KΩ 1KΩ Learn Switch Option Links Serial Data Output Vcc Data Input O/P 1 O/P 2 O/P 3 O/P 4 Transmitter Low Battery Status LED 22KΩFM / IR AM 22KΩ Fit One Re sistor Only L M 15KΩ N/C RF Receiver 1 2 3 4 5 6 7