T7-434-075 RFSOLUTIONS | Alldatasheet

Document overview

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Technical content

Features

  • Miniature SIL Package
  • FM Narrow Band
  • Fully Shielded
  • Narrow Band Crystal Stabilised
  • Data Rates Up To 20 Kbits/S
  • En 300-220 Compliant
  • Data & AF Out
  • CD Implemented On Data Output
  • RSSI Output
  • Selective Ceramic IF Filters T7/R7 Modules
  • Wide Operating Voltage (2.2 - 10 Vdc).
  • Optimal Range 600 metres T7G/R7G Modules
  • 3 or 5 Volt Operating Voltage
  • 3 Channels available from Stock
  • Optimal Range 1,000 metres General Description The T7/R7 series are miniature narrow band transmitter and receiver UHF radio modules, which enable the implementation of a simple telemetry link at data rates up to 20Kbits/s. These narrow band UHF radio modules provide a very high RF performance for general purpose applications. The transmitter modules have a power output of up to 25mW. When combined with a very high receiver sensitivity these modules obtain a very high performance of range and reliability within the 433MHz band.

Applications

  • Telemetry Systems
  • Wireless Networking
  • Domestic And Commercia l Wireless Security Systems
  • Panic Attack Facility
  • Remote Control For Cranes Etc Available for operation between 433.075 and

434.725 MHz in 25KHz steps there are currently 3

different frequency channels available from stock. (others available to special order) The T7G and R7G genesis modules represent the latest generation of narrow band transmitters. They retain the same indu stry standard footprints and are fully compatible with the T7 and R7 modules to enable incorporation into both new and existing designs. The improved sensitivity of the R7G enables a range of up to 1Km when used with the T7G modules.

DS307-7 Oct 05 ©2004 REG No 277 4001, England. Page 2 FM 433MHz Narrow Band T7 / R7 T7G / R7G Frequency Channels T7 / R7 These modules are available at 4345.075MHz only. T7G / R7G These modules are available in 34 discrete frequency channels from 433.075 to 434.725 MHz in 50KHz steps. The table below shows the list of possible frequency channels. CH. FREQ/MHz CH. FREQ/MHz 1 433.075(2) 18 433.925(2) 2 433.125(2) 19 433.975(2) 3 433.175(2) 20 434.025(2) 4 433.225(2) 21 434.075 (1) 5 433.275(2) 22 434.125(2) 6 433.325(2) 23 434.175(2) 7 433.375(2) 24 434.225(1) 8 433.425(2) 25 434.275(2) 9 433.475(2) 26 434.325 (2) 10 433.525(2) 27 434.375(2) 11 433.575(2) 28 434.425(2) 12 433.625(2) 29 434.475(2) 13 433.675(2) 30 434.525 (1) 14 433.725(2) 31 434.575(2) 15 433.775(2) 32 434.625(2) 16 433.825(2) 33 434.675(2) 17 433.875(2) 34 434.725(2) (1) Stock Item (2) Future Development

DS307-7 Oct 05 ©2004 REG No 277 4001, England. Page 3 FM 433MHz Narrow Band T7 / R7 T7G / R7G Absolute Maximum Ratings: Transmitter (all voltage versions) T7 T7G Min. Max. Min. Max. Operating Temperature -25°C +55 °C -10 °C +55 °C Storage Temperature -40°C +100 °C -40 °C +100 °C Supply Voltage - 12V - 5.5V Data Input - 10V - 5.5V Electrical Characteristics: Transmitter T7 T7G DC Levels Supply (3V variants) - - - 2.2 3.0 4.0 Volts 3 Current & RF Power Supply current @ VCC = 5V 7 24 mA 3 1 RF output power @ VCC = 5V 3 25 mW 2 1 Supply current @ VCC = 3V - 22 mA 3 1 RF output power @ VCC = 3V - 13 mW 2 1 RF & Data (All Variants) 2nd harmonic -60 -40 dBm 2 Harmonics @ > 1GHz -60 -50 dBm 2 Initial frequency accuracy +/-25 +/-25 Hz Frequency accuracy over full temp range +/-30 ±27 KHz Modulation bandwidth @ -3dB 20 30 KHz 3 Power up time to full RF 5 5 ms Data rate 20 20 kbits/s Data pulse width 50 50 µs Notes 1. Measured into a 50 Ω impedance. 2. The limit for the European spec EN 300 220 is -36dBm 3. A +/-2.5KHz Deviation on the RF carrier is also available Part No Description T7-434-075 SIL Transmitter 434.075MHz T7G-434-075 SIL Transmitter 434.075MHz T7G-434-075-3V SIL Transmitter 434.075MHz, 3 Volt version T7G-434-225 SIL Transmitter 434.225MHz T7G-434-525 SIL Transmitter 434.525MHz T7G-434-525-3V SIL Transmitter 434.525MHz, 3 Volt version

DS307-7 Oct 05 ©2004 REG No 277 4001, England. Page 4 FM 433MHz Narrow Band T7 / R7 T7G / R7G Absolute Maximum Ratings: Receiver R7 R7G Min. Max. Min. Max. Operating Temperature -10°C +55 °C -10 °C +55 °C Storage Temperature -40°C +100 °C -40 °C +100 °C Supply Voltage - 7V - 5.5V RF Input - +20dBm (100mW) - +10dBm (10mW) Note: Receiver modules with operating temperatures from -40°C to +80°C are also available Electrical Characteristics: Receiver R7 R7G DC Levels Supply voltage 4.5 5 5.5 4.5 5 5.5 V Supply current 6 7 11 mA Supply ripple - - 10 10 mV P-P Data output high =>4.5 =>4.0 V Data output low <=0.5 <=0.5 V RF RF sensitivity -113 -117 dBm 2 IF Bandwidth +/-27 +/-27 KHz Initial frequency accuracy +/-100 +/-25 Hz Max R.F. input 20 10 dBm E.M.C. Spurious responses up to 1GHz <60 <60 dB LO leakage, conducted <60 <60 dBm LO leakage, radiated <60 <60 dBm Image rejection 63 35 dB DYNAMIC TIMING Power up to stable data (With RF signal present) 18 23 110 mS 1 Signal to stable data (With PSU already on) 2.5 5 1 mS 1 Power up to valid RSSI ( With RF signal Present ) 3 5 2.5 3.5 mS 1 Mark:space ratio 50 50 % Bit rate 100 20000 100 20000 Bps 3 Notes 1. Timings are to be confirmed. 2. For R7G: For 12dB SINAD from the AF output 3. Note 1Hz = 2 bps Part No Description R7-434-075 SIL Receiver 434.075MHz R7G-434-075 SIL Receiver 434.075MHz R7G-434-225 SIL Receiver 434.075MHz R7G-434-525 SIL Receiver 434.075MHz

DS307-7 Oct 05 ©2004 REG No 277 4001, England. Page 5 FM 433MHz Narrow Band T7 / R7 T7G / R7G Transmitter Connection Diagram 12 345 Figure 1: Narrow Band T7 / T7G Transmitters 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 (pin 2) 50 Ohm RF antenna output. To achieve best results, the antenna impedance must match that of the module. Vcc (pin 3) +Ve supply pin. The module will generate RF when Vcc is present. GND (pin 4) Supply and data ground connection, connected to pin 1. Data IN (pin 5) This input has an impedance of 47K Ohms 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. Receiver Connection Diagram Figure 2: Narrow Band R7 / R7G Receivers Pin Description: RF IN ( pin 1)

50 Ohm 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, pr eferably connected to a solid ground plane. RSSI / Carrier Detect (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. A simple transistor interface can yield a carrier detect logic output. GND (pin 4) Connect to power supply ground. VCC (pin 5) +Ve supply pin. Operation from a 5V supply able to source 10mA at less than 10mV p-p ripple. AF (pin 6) Audio frequency output ( max 40microA source ) DATA OUT (pin 7) CMOS compatible output. This may be used to drive external decoders. To reduce any noise on this output add a 56pF cap from this pin to GND. 12 34567

DS307-7 Oct 05 ©2004 REG No 277 4001, England. Page 7 FM 433MHz Narrow Band T7 / R7 T7G / R7G CE 31.5 mm 10.5 mm 3.0 mm 20.32 mm 12 345 Pin spacings 2.54 mm Pin Dia 0.5mm All dimensions +/- 0.5mm 1.5mm 3.5mm T7 / T7G R7 / R7G 12 34567 30.48mm pin spacing 2.54mm 17mm 48mm 4.65mm Pin spacings 2.54 mm Pin Dia 0.5mm pin 1 is 2.33mm from edge of module All dimensions +/- 0.5mm 8.30mm Reducing Power to 10mW If the T7G transmitter will be used with an efficient antenna in countries where only 10mW radiated power is allowed, then a simple resistive network on the output of the module will attenuate the power down to this level. When laying out this network, keep all tracks as short as possible, especially ground paths and use 50 ohm track impedances when connecting to and from this network. This impedance can be realised on 1.6mm FR4 pcb by using a track width of 2.5mm. RSSI Values The R7 / R7G receiver RSSI outputs provide a DC output proportional to the RF signal. The table below shows the typical RSSI value depending on the Signal strength. RF Signal Strength/dBm R7 (V) GR7 (V) -130 1.03 1.25 -120 1.06 1.32 -110 1.16 1.46 -100 1.34 1.69 -90 1.59 1.96 -80 1.78 2.2 -70 1.81 2.47 -60 1.81 2.5 -50 2.17 2.5 -40 2.45 - -30 2.52 - -20 2.52 - Notice that the region between –80 to –60 is with the receiver agc operating. If required, a receiver version with agc disabled can be provided as a factory Pre-set option. This would linear-rise the RSSI curve. Mechanical Dimensions 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 Information contained in this document is believed to be accurate , however no representation or warranty is given and no liabi lity is assumed by R.F. Solutions Ltd. With T7B TO ANTENNA 12 34 5 Circuit Diagram 22ohm 220 ohm 220 ohm