Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 Issue 2, 01 November 2004 TX2 & RX2 UHF FM Data Transmitter and Receiver Modules The TX2 and RX2 data link modules are a miniature PCB mounting UHF radio transmitter and receiver pair which enable the simple implementation of a data link at upto 160 kbit/s at distances upto 75 metres inbuilding and 300 metres open ground. Features: left: TX2 transmitter right:RX2 receiver CE certified by independent Notified Body Verified to comply with harmonised radio standard EN 300 220-3 by accredited Test Laboratory Verified to comply with harmonised EMC standard EN 301 489-3 by accredited Test Laboratory Data rates up to 160 kbps Usable range up to 300 m 433.92 MHz versions. Fully screened Available for operation at 433.92 MHz in Europe (including UK), both modules combine full screening with extensive internal filtering to ensure EMC compliance by minimising spurious radiations and susceptibilities. The TX2 and RX2 modules will suit one-to-one and multi-node wireless links in applications including car and building security, EPOS and inventory tracking, remote industrial process monitoring and computer networking. Because of their small size and low power requirements, both modules are ideal for use in portable, battery-powered applications such as hand-held terminals. Transmitter - TX2 2 stage SAW controlled, FM modulated at up to 160 kbps Operation from 2.2V to 6V +9dBm on 433.92MHz High efficiency, >15%, DC RF Improved frequency and deviation accuracy 2nd harmonic, < -60dBc Receiver - RX2 Double conversion FM superhet SAW front end filter, image rejection 50dB Supply 3.0V to 6.0V @ 13mA -96 dBm sensitivity @1ppm BER with 160kbps version -100 dBm sensitivity @ 1ppm BER with 40kbps-version -107 dBm sensitivity @ 1ppm BER with 14kbps-version LO leakage, < -60 dBm Radiometrix Ltd., TX2 & RX2 Data Sheet page 1 Functional description: The TX2 transmitter module is a two stage, SAW controlled FM transmitter operating between 2V and 6V and is available in 433.92MHz. The TX2 module is type approved to EN 300 220-3 for European use and delivers nominally +9dBm from a 5V supply at 12mA. The module measures 32 x 12 x 3.8 mm. The RX2 module is a double conversion FM superhet receiver capable of handling date rates of up to 160kbps. The SIL style RX2 receiver measures 48 x 17.5 x 4.5 mm. It will operate from a supply of 3-6V and draws 14mA when receiving. A fast-acting carrier detect and a power-up enable time of less than 1ms. This allows effective duty cycle power saving and a -107 dBm sensitivity. This combined with a SAW front-end filter results in an excellent RF performance and EMC conformance. TX2 transmitter: Vcc (3) RF out (2) 433 MHz band pass filter 100 kHz nd 2 order LPF buffer +10 dBm @ 5V 433.92MHz SAW-stabilised oscillator RF gnd (1) TXD (5) 100K 0 VOLT (4) Fig. 1: TX2 block diagram Pin description: RF GND (pin 1) RF ground pin, internally connected to the module screen and pin 4 (0V). This pin should be connected to the RF return path (e.g. coax braid, main PCB ground plane etc.) RF out (pin 2) 50Ω RF output to the antenna, it is DC isolated internally. (see antenna section for suggested antenna/feeds). Fig.2: physical dimensions Vcc (pin 3) +ve supply pin. The module will generate RF when the Vcc supply is present. Maximum ripple content 0.1VP-P. A 100nF de-coupling ceramic capacitor is suggested. 0V (pin 4) Supply ground connection, connected to pin 1 and screen. TXD (pin 5) This DC coupled modulation input will accept either serial digital data ( 0V to Vcc levels) or high level linear signals. Input impedance is 100kΩ. Radiometrix Ltd., TX2 & RX2 Data Sheet page 2 RX2 receiver: 418 MHz SAWcontrolled 1st Local oscillator RF in (1) 433 MHz band pass filter pre amplifier Vcc (5) nd 2 local oscillator 15.82 MHz 2µF CD (3) nd SAW band pass filter 2 mixer IF amlpifier AF 91 kHz demodulator st 1 mixer AF (6) buffer adaptive data slicer + Data out (7) - RF gnd (2) 0 VOLT (4) Fig. 3: RX2 block diagram Pin description RF in (pin 1) 50Ω RF input from the antenna, it is DC isolate internally. (see antenna section for suggested antenna/feeds). RF GND (pin 2) RF ground pin, internally connected to the module screen and pin 4 (0V). This pin should be connected to the RF return path (e.g. coax braid, main PCB ground plane etc.) Fig. 4: physical dimensions CD (pin 3) The Carrier Detect may be used to drive an external PNP transistor to obtain a logic level carrier detect signal, see test circuit. If not required it should be connected to pin 5 (Vcc). 0 Volt (pin 4) Supply ground connection, connected to pin 1 and screen. Vcc (pin 5) +ve supply pin. +3.0V to +6.0V @ <17mA . The supply must be clean < 2mVP-P ripple. A 10µF decoupling capacitor and 10Ω series resistor is recommended if a clean supply is not available. AF (pin 6) This is a buffered and filtered analogue output from the FM demodulator. It has a standing DC bias of 1.2V and 400mV P-P base band signal. It is useful as a test point or to drive linear decoders. Load impedance should be > 2kΩ and < 100pF. RXD (pin 7) This digital output from the internal data slicer is a squared version of the signal on pin 6 (AF). It may be used to drive external decoders. The data is true data, i.e. as fed to the transmitter. Load impedance should be > 1kΩ and < 1nF Radiometrix Ltd., TX2 & RX2 Data Sheet page 3 Survival Maximums: Operating temperature: Storage temperature: -10°C to +55°C -40°C to +100°C TX2, all variants Vcc (pin 3) Data input (pin 5) RF out (pin 2) -0.1V to +10.0V -0.1V to +10.0V ±50V @ < 10MHz , +20dBm @ > 10MHz RX2, all variants Vcc (pin 5) Data, CD & AF (pin 7,3,6) RF input (pin 1) -0.1V to +10.0V -0.1V to + Vcc V ±50V @ < 10MHz , +13dBm @ > 10MHz note: Operation of the TX2 above 6V may cause the module to exceed the licensed power level. E lectrical Performance: TX2 transmitter pin min. typ. max. units notes 3 3 2.2 4.0 3.0 5.0 4.0 6.0 V V -3V version -5V version TX2-433-3V supply current @ Vcc = 3V RF power @ Vcc = 3V 3 2 4 0 6 +4 10 +6 mA dBm 1 TX2-433-5V supply current @ Vcc = 5V RF power @ Vcc = 5V 3 2 7 +6 10 +9 14 +12 mA dBm 1 RF 2nd harmonic harmonics @ > 1GHz initial frequency accuracy overall frequency accuracy 2 2 - -30 -70 -65 -50 0 - -54 -40 +30 +70 dBc dBc kHz kHz - 20 DC DC - 25 5 - 30 20 100 10 100 kHz kHz kHz % µs DC LE VE LS supply voltage supply voltage CURRE NT & RF POWE R FM deviation (+/-) modulation bandwidth @ -3dB modulation bandwidth @ -3dB modulation distortion (THD) power up time to full RF note: - 1 1 2 1. Measured into a 50Ω load. 2. For 160kbps version Radiometrix Ltd., TX2 & RX2 Data Sheet page 4 E lectrical Performance: RX2 Receiver Unless otherwise noted: Figures apply to 5V versions unless noted otherwise Vcc = 5.0V, temperature 20°C unless noted otherwise pin min. typ. Max. units notes DC LE VE LS supply voltage, Vcc standard supply voltage, Vcc, 3V version supply current supply ripple data output high, 100µA source data output low, 100µA sink load capacitance on AF / Data 5 5 5 5 7 7 6,7 4.0 3.3 11 - 5.0 3.5 13 Vcc-0.6 0.4 - 6.0 4.0 17 2 100 V V mA mVP-P V V pF 1 RF RF sensitivity for 10dB (S+N)/N RF sensitivity for 10dB (S+N)/N RF sensitivity for 10dB (S+N)/N RF sensitivity for 1ppm BER RF sensitivity for 1ppm BER RF sensitivity for 1ppm BER CD threshold CD threshold CD threshold IF band width initial frequency accuracy 1,6 1,6 1,6 1,6 1,6 1,6 1,3 1,3 1,3 1 -107 -100 -100 -93 -97 -90 -30 -113 -107 -96 -107 -100 -90 -107 -100 -104 250 0 +30 dBm dBm dBm dBm dBm dBm dBm dBm dBm kHz kHz E .M.C. image rejection (2*FIF) spurious responses upto 1GHz LO leakage, conducted LO leakage, radiated 1 1 1 - - -50 -70 -65 -70 - dB dB dBm dBm AF BASE BAND baseband bandwidth @ -3dB baseband bandwidth @ -3dB baseband bandwidth @ -3dB AF level DC offset on AF distortion on recovered AF ultimate (S+N)/N ultimate (S+N)/N 6 6 6 6 6 6 6 6 0.006 0.060 0.250 0.8 35 - 450 1.2 0.5 45 28 7 20 91 1.6 1 - kHz kHz kHz mVP-P V % dB dB - - 1 20 5 3 0.6 0.7 - ms ms ms ms ms ms 14kbps version 40kbps version 160kbps version 14kbps version 40kbps version 160kbps version 14kbps version 40kbps version 160kbps version 2 2 14kbps version 40kbps version 160kbps version 160kbps version DYNAMIC TIMING Power up with signal present power up to valid CD, TPU-CD power up to stable data, TPU-DAT power up to stable data, TPU-DAT power up to stable data, TPU-DAT power up to stable AF, TPU-AF power up to valid CD, TPU-CD Radiometrix Ltd., TX2 & RX2 Data Sheet 14kbps version 40kbps version 160kbps version 160kbps version 160kbps version page 5 pin min. Signal applied with supply on signal to valid CD, TSIG-CD signal to stable data, TSIG-DAT signal to stable data, TSIG-DAT signal to stable data, TSIG-DAT signal to stable AF, TSIG-AF signal to valid CD, TSIG-CD - - time between data transitions time between data transitions time between data transitions mark:space ratio 7 7 7 - 0.07 0.025 0.00625 20 notes: 1. 2. 3. 4. typ. Max. units notes 0.5 15 3 0.75 0.1 0.2 - ms ms ms ms ms ms 14kbps version 40kbps version 160kbps version 160kbps version 160kbps version 50 15 1.5 0.5 80 ms ms ms % 4, 14kbps version 4, 40kbps version 4, 160kbps version 3 For 6dB (S+N)/N degradation on wanted -100dBm signal Receiver spurious responses are at FRF ± (n×15.92MHz), n=1,2,3 etc. Average over 30ms (14kbps), 3ms (40kbps), 1ms (160kbs) at maximum bit rate. Values for 50:50 mark to space (i.e. square wave) Module test circuits Fig.5: TX2 test circuit Fig.6: RX2 test circuit ∗ The PNP transistor (e.g. BC558B) enables a CMOS compatible Carrier Detect signal to be derived from pin 3. If no CD signal required pin 3 should be connected directly to pin 5 (Vcc). Radiometrix Ltd., TX2 & RX2 Data Sheet page 6 Module mounting considerations The modules may be mounted horizontally or vertically on an area of ground plane preferably close to the antenna to minimise feed length. The receiver and it’s antenna should be kept away from sources of interference (micro’s, SMPS etc.). The modules may be potted if required in a viscous compound which can not enter the screen can.. Warning: Do NOT wash the modules. They are not hermetically sealed. Fig. 7: module mounting options Antenna requirements Three types of integral antenna are recommended and approved for use with the module: 0.5 mm enameled copper wire close wound on 3.2 mm diameter former RF 433 MHz = 24 turns A. Helical antenna Feed point 15% to 25% of total loop length RF-GND track width = 1mm 2 C2 C3 C4 4 to 10 cm inside area C1 RF B. Loop antenna 16.4cm C. Whip antenna wire, rod, PCB-track or a combination of these three RF 433 MHz = 16.4 cm total from RF pin. Fig.8: Antenna Ultimate performance Easy of design set-up Size Immunity proximity effects Range open ground to similar antenna A helical ** ** *** ** 200m B loop * * ** *** 100m C whip *** *** * * 300m (for TX2-433-14-5V & RX2-433-14-5V) Antenna selection chart Radiometrix Ltd., TX2 & RX2 Data Sheet page 7 A) Helical Wire coil, connected directly to pin 2, open circuit at other end. This antenna is very efficient given it's small size (20mm x 4mm dia.). The helical is a high Q antenna, trim the wire length or expand the coil for optimum results. The helical de-tunes badly with proximity to other conductive objects. B) Loop A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed from pin 2 at a point 20% from the ground end. Loops have high immunity to proximity de-tuning. C) Whip This is a wire, rod, PCB track or combination connected directly to pin 2 of the module. Optimum total length is 15.5cm (1/4 wave @ 433MHz). Keep the open circuit (hot) end well away from metal components to prevent serious de-tuning. Whips are ground plane sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small and plastic cased The antenna choice and position directly controls the system range. Keep it clear of other metal in the system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is often not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an internal antenna must be used try to keep it away from other metal components, particularly large ones like transformers, batteries and PCB tracks/earth plane. The space around the antenna is as important as the antenna itself Duty Cycle requirements The duty cycle is defined as the ratio, expressed as a percentage, of the maximum transmitter “on” time on one or more carrier frequencies, relative to a one hour period. Where an acknowledgement message is required, the additional transmitter “on” time shall be included. There is a 10% duty cycle restriction on 433.050-434.790 MHz band in most of the EU member states. The TX2-433 is a RF module intended to be incorporated into a wide variety of applications and finished products, Radiometrix has no control over the end use of the TX2-433.The harmonised band 433.050 to 434.790 MHz as detailed in Annex 1 Band E of CEPT/ERC Recommendation 70-03 (which can be downloaded at http://www.ero.dk/scripts/docmanag98/dm.dll/QueryDoc?Cat=Recommendation) has list of countries where Duty Cycle restriction apply. Module users should, therefore, ensure that they comply with the stated Duty Cycle requirements of the version of CEPT/ERC Recommendation 70-03 in place at the time of incorporation of the TX2-433 into their product. It should be noted that the stated Duty Cycle must not be exceeded otherwise any approval granted for the TX2-433 will be invalidated. Radiometrix Ltd., TX2 & RX2 Data Sheet page 8 Variants and Ordering information The TX2 transmitter and RX2 receiver are manufactured in several variants Supply voltage 5V 3V ( 4V to 6V TX2 & RX2) ( 3.3V to 4V for RX2, 2.2V to 4V for TX2) RX data rate: Slower version, Faster version, Very fast version TX data rate 7kHz baseband BW, data rate up to 14kbps 20kHz baseband BW, data rate up to 40kbps 91kHz baseband BW, data rate up to 160kbps Faster version, 20kHz baseband BW, data rate up to 40kbps Very fast version, 100kHz baseband BW, data rate up to 160kbps The following are standard: TX2-433-40-5V: TX2-433-160-5V: 433.92 MHz , 5V TX , 10mW 433.92 MHz , 5V TX , 10mW RX2-433-14-5V: RX2-433-40-5V: RX2-433-160-5V 433.92 MHz , 5V RX , 14kbps 433.92 MHz , 5V RX , 40kbps 433.92 MHz , 5V RX , 160kbps 3V versions of the above are available and should be ordered with a -3V suffix on the part number. (e.g. RX2-433-14-3V is set-up for 3.3V to 4V operation) Radiometrix Ltd., TX2 & RX2 Data Sheet page 9 Radiometrix Ltd., TX2 & RX2 Data Sheet page 10 Radiometrix Ltd., TX2 & RX2 Data Sheet page 11 Radiometrix Ltd., TX2 & RX2 Data Sheet page 12 CE Certificate of TX2 and its variants Radiometrix Ltd., TX2 & RX2 Data Sheet page 13 CE Certificate of RX2 and its variants Radiometrix Ltd., TX2 & RX2 Data Sheet page 14 Radiometrix Ltd Hartcran House 231 Kenton Lane Harrow, Middlesex HA3 8RP ENGLAND Tel: +44 (0) 20 8909 9595 Fax: +44 (0) 20 8909 2233 [email protected] www.radiometrix.com Copyright notice This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in part must give clear acknowledgement to the copyright owner. Limitation of liability The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. This data sheet neither states nor implies warranty of any kind, including fitness for any particular application. These radio devices may be subject to radio interference and may not function as intended if interference is present. We do NOT recommend their use for life critical applications. The Intrastat commodity code for all our modules is: 8542 6000 R&TTE Directive After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of the R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance to the essential requirements specified in Article 3 of the Directive, as appropriate to the particular equipment. Further details are available on The Office of Communications (Ofcom) web site: http://www.ofcom.org.uk/radiocomms/ifi/licensing/licensing_policy_manual/ Information Requests Ofcom Riverside House 2a Southwark Bridge Road London SE1 9HA Tel: +44 (0)845 456 3000 or 020 7981 3040 Fax: +44 (0)20 7783 4033 [email protected] European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 [email protected] www.ero.dk