ds2010_2 dec ?01 2001 reg no 277 4001, england. page 1 fm narrow band transceiver modules x20 10 / X2011 features operation on 434.075, 868.40 and 914.5 mhz X2011 version includes integrated pcb loop antenna (434 & 868 mhz versions) double rf filtering = high reliability rf link data rates to 20 kbps (wide-band 64 kbps version available to order) -112 dbm receiver sensitivity (434 version) cd and rssi outputs crystal stabilised accurate rf, hence narrower bw filter utilised results in over 300m range en 300 220-1, 300 683 & fcc compliant immune to tetra and high power radio amateur repeater stations applications epos terminals wireless networking domestic and commercial wireless security systems panic attack facility remote control for cranes etc general description the x2010 radio transceiver module was designed to provide reliable wireless operation at moderate data rates for use throughout the world. its unique features of narrower rf channel bandwidths and hence high interference rejection capability at saw module prices make the x2010 the ideal choice for next generation applications. available at several frequency options, these modules have been designed to provide a reliable wire free link within the presence of other interference at the same frequency, accounting for the increased traffic from other legal users of the radio spectrum the transmitter section uses a pll design that utilises a highly stable and accurate reference crystal oscillator. this results in a rf transmission tightly controlled in its frequency spread and over its operating temperature range. this is exploited in the receiver design. the receiver section uses a single conversion super- het design, again using pll technology. hence narrower bandwidth rf filters are utilised which result in superior rejection of interference as well as providing good receiver sensitivity and hence range
ds2010_2 dec ?01 2001 reg no 277 4001, england. page 2 fm narrow band transceiver modules x20 10 / X2011 absolute maximum ratings operating temperature: -25 c to +55 c storage temperature: -40 c to +100 c supply voltage (pin 3) 6v data input (pin 5) vcc + 0.3v rf input 0dbm electrical characteristics: performance data measured at 20 o c and +5 volt supply and rf = 434.075 mhz. pin min. typ. max. units notes dc levels supply voltage 17 4.5 5 5.5 v supply current (receiver enabled) 17 7 ma supply current (transmitter enabled) 17 8 ma leakage current with vcc connected 1 ua 1 data input/output high 12,14 0.7xvcc vcc v data input/output low 12,14 0 0.0xvcc v rf receiver sensitivity (12 db sinad on af output) 13 -112 dbm image rejection 50 db rf power out (transmitter) 1 mw fm deviation +/-10 khz initial frequency accuracy 100 hz overall frequency accuracy +/-10 khz max r.f. input to receiver 0 dbm e.m.c. spurious responses upto 1ghz <-36 db lo leakage, conducted <60 dbm lo leakage, radiated <60 dbm dynamic timing rx enable to valid rssi / cd 1 ms rx enable to stable receiver data out 6 ms tx enable to full rf out 5 ms max / min data pulse width 0.1 1 ms 3 data bit rate 1000 10,000 bps 2 notes 1. sleep mode, that is with tx and rx not enabled 2. 1 hz = 2 bps 3. 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, although pulse width modulation up to 70:30/30:70 can also be used.
ds2010_2 dec ?01 2001 reg no 277 4001, england. page 3 fm narrow band transceiver modules x20 10 / X2011 x2010 mechanical detail notes 1. recommended pcb hole diameter to accommodate the connecting pins = 1.2mm 2. pins are on a 2.54mm pitch 3. pins 4,5,6 and 7 are internally floating (unconnected) 30.4 mm 9.3 mm 5.0 mm 1.3 mm 2.8 mm 22.0 mm 33.0 mm pin 1 top view side view
ds2010_2 dec ?01 2001 reg no 277 4001, england. page 4 fm narrow band transceiver modules x20 10 / X2011 X2011 mechanical detail notes 1. recommended pcb hole diameter to accommodate the connecting pins = 1.2mm 4. pins are on a 2.54mm pitch 1 7 8 9 18 17 16 15 14 13 12 11 10 48 mm 23 mm 3 mm 33 mm loop antenna 30.4 mm 9.3 mm 5.0 mm 1.3 mm 2.8 mm side view
ds2010_2 dec ?01 2001 reg no 277 4001, england. page 5 fm narrow band transceiver modules x20 10 / X2011 pin functional description pin no. description details 1 & 3 rf ground ideally connected to antenna ground plane. 2 antenna nominal 50 ohm input/output impedance capacitively isolated from internal circuit. 4,5,6 nc not connected internally on x2010 module. 7 nc ground x2010 : this is unconnected X2011 : rf ground. 8 rssi receiver signal strength indicator. dc voltage proportional to the rf signal strength being received. 9,10,18 ground supply ground points. 11 cd carrier detect output, active low. 12 rxd receiver data output ( cmos logic out ) 13 af audio frequency output. 14 txd transmitter data input. 15 tx enable active low, applying vcc disables the transmitter. 16 rx enable active low, applying vcc places the receiver in sleep mode. 17 vcc supply voltage. state table tx (pin 15) rx (pin 16) mode 1 1 power down mode. supply current <1ua 1 0 receiver only enabled. data, af, cd and rssi outputs valid. 0 1 transmitter only enabled. tx data input valid. 0 0 tx and rx enabled. this mode is to be avoided as damage to the module will eventually occur. rssi output the rssi output provides a dc voltage that is proportional to the rf signal strength picked up on the antenna (pin 2) port of the module. the table below gives typical values of rssi for varying degrees of rf signal strength applied rf input ( dbm) rssi (v) -105 0.82 -100 0.88 -90 1.12 -80 1.43 -70 1.75 -60 2.06 -50 2.36 -40 2.57 -30 2.6 -20 2.6
ds2010_2 dec ?01 2001 reg no 277 4001, england. page 6 fm narrow band transceiver modules x20 10 / X2011 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 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 @ ? wavelength (15.5cm @ 433.92mhz). further range may be achieved if the ? 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 part numbers part number description x2010-434 narrow band transceiver 434.075mhz X2011-434 narrow band transceiver 434.075mhz integral antenna x2010-868 narrow band transceiver 868.4mhz X2011-868 narrow band transceiver 868.4mhz integral antenna x2010-915 narrow band transceiver 914.5mhz X2011-915 narrow band transceiver 914.5mhz integral antenna 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 : sales@rfsolutions.co.uk 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.
|
