radiometrix ltd lmt0/LMR0 data sheet page 1 features ?? conforms to en 300 220-2 and en 301 489-3 ?? high performance double superhet. pll synthesizer with tcxo ?? 6 channels (standard). up to 16 parallel select or 32 serial select channels ?? quasi-dc (peak sampling) data recovery circuit (for enhanced performance on unbalanced datastreams) ?? data rates up to 4 kbps for standard module ?? usable range over 1km ?? fully screened. low profile ?? feature-rich interface (rssi, analogue and digital baseband) ?? re-programmable via uart interface ?? low power requirements applications ?? radio control (r/c) radio service under fcc part 95 subpart c ?? radio model control ?? telemetry and telecommand ?? wireless door entry systems ?? simple on/off switching ?? in-building environmental monitoring and control ?? security and fire alarms ?? vehicle/machinery controls technical summary ?? frequencies: 10mw 26.957-27. 283mhz non-specific short range devices (srd) 100mw 26.995, 27.045, 27.095, 27.145, 27. 195, 27.255mhz remote control any 0.5mhz wide sub-band in 26-28mhz ?? transmit power: +10dbm (10mw) @ 4.1v; +20dbm (100mw) version also available ?? receiver sensitivity: -115dbm (for 12 db sinad) ?? supply range: 4.1v ? 15v transmitter ?? 3.1v ? 15v receiver ?? current consumption: 40ma @ 10mw transmit; 100ma @ 100mw transmit 20ma receive ?? data bit rate: 4kbps max. evaluation platforms : nbek + lm series carrier the lmt0 transmitter and LMR0 receive r modules offer a 10khz channel spacin g multi channel, low power, and reliable h f data link. this makes the lmt0/LMR0 pai r ideally suited to those low powe r applications where existing wideban d modules have insufficient range, or wher e low cost multi-channel operation is needed without compromising on r f specification or regulatory requirement. 27mhz hf narrow band fm multi channel radio modules hartcran house, 231 kenton lane, harrow, middlesex, ha3 8rp, england tel: +44 (0) 20 8909 9595, fax: +44 (0) 20 8909 2233, www.radiometrix.com issue 4 , 5 a u g ust 2014 lmt0/LMR0 figure 1: lmt0 transmitter and LMR0 receiver
radiometrix ltd lmt0/LMR0 data sheet page 2 figure 2: lmt0 block diagram
radiometrix ltd lmt0/LMR0 data sheet page 3 figure 3: lmt0 footprint (top view) pin description ? lmt0 pin name function 1a vcc 4.1v ? 15v power supply 2a 0v ground 3a txe transmit enable (active low) 4a txd dc coupled input for cmos logic. r in =47k ? 5a no pin not present in lmt0 1b p0/pgm parallel channel select lsb serial frequency programming / configuration 1 2b p1 parallel channel select 3b p2 parallel channel select 4b p3 parallel channel select msb 5b no pin not present in lmt0 notes: 1. serial programming is by an inverted, cmos logic level, 2400 baud uart data stream applied to the pgm pin. 2. channel select inputs have pull-ups (50k ? ) to 4v internal rail. do not exceed 4v logic levels on this port. 3. channel select inputs are active low 4. txe has a 100k ? pull-up to vcc 5. all pins are on an 0.1" grid 6. the pins 5a/b are not present, but are included in f ootprint for compatibility with other units in this family
radiometrix ltd lmt0/LMR0 data sheet page 4 figure 4: LMR0 block diagram
radiometrix ltd lmt0/LMR0 data sheet page 5 figure 5: LMR0 footprint (top view) pin description ? LMR0 pin name function 1a vcc 3.1 ? 15v power supply 2a 0v ground 3a rxe receiver enable (active high) 4a rxd data out (open collector, no pull-up) 5a af out 600mv p-p audio. dc coupled, approx 0.8v bias. 1b p0/pgm parallel channel select lsb serial frequency programming / configuration 1 2b p1 parallel channel select 3b p2 parallel channel select 4b p3 parallel channel select msb 5b rssi dc level between 0.5v and 2.2v. 60db dynamic range notes: 1. serial programming is by an inverted, cmos l ogic level, 2400 baud uart data stream applied to the p0 pin. 2. channel select inputs have pull-ups (50k ? ) to 3v internal rail. do not exceed 3v logic levels on this port. 3. channel select inputs are active low 4. all pins are on an 0.1" grid 5. unit will operate (with marginally reduced specifications) from a 3.0v rail. this must be well regulated and without noise or ripple, as in this state the unit's internal regulator no longer operates, and provides no supply rejection. 6. a quasi-dc data extractor is provided, to better deal with mark - space errors in simple coder schemes 7. compared to a standard lmr, the af output has the opposite 'sense'. data output polarity is, however, the same.
radiometrix ltd lmt0/LMR0 data sheet page 6 serial interface commands 2400 baud uart. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits. serial data is sent to the unit on one of the parallel channel select pins (p0). it is very important that the unit does not 'decode' switch bounce in ordinary operation as a command string, or spurious re-writing of the e2prom will result. for this reason the user must send the 16 character string enableserialmode (followed by a carriage return) to activate the serial command mode before sending any of the command strings listed below. command mode is disabled on power down, or on reception of a # character. to successfully program the unit, it must be enabled ('rxe high (rx) or txe low (tx)). the lmt0 / LMR0 modules are supplied in one of two possible software versions, depending on the frequency table setup. the usual load-out (used for the def ault 6 channel ?radio control? version) is the eight channel version described below. if a 32 channel unit has been ordered, then these radios will be supplied programmed with the standard lmt1 / lmr1 software, and are programmed using the commands detailed in those data sheets the 8 channel lm series software is a little unusual, in that it provides a unique r divider value for each channel, rather than storing a single value common to a ll. this in turn allows the use of comparison frequencies higher than the 5khz that would otherwise be necessary to set up the fcc specified frequencies (a comparison frequency below 10khz will result in unacceptably slow pll setting, and compromised switching speed) unfortunately, the mathematics necessa ry to generate the relevant n / r values is somewhat involved, and most users will be unlikely to need to reprogram the c hannel table. further information can be obtained from radiometrix, if needed. gochan a a serially select channel a, where a is ch0 to ch7 setpar channel selected by 4 bit parallel inputs (ch0 to ch7) setser channel selected by most recent gochan operation rvalue rrrr r register value used for single operation (only) single nnnnn set value of n for single channel operation. n value not stored in eeprom process entry / clear all buffers # disable command mode a = one digit channel number, from 0 to 7 nnnnn = synthesizer n register value (up to 65535) rrrr = synthesizer r register value (up to 16383) frequency table programming commands are as follows: ldtxn a nnnnn set value of n register for channel a (lmt0 only) ldtxr a nnnnn set value of r register for channel a (lmt0 only) ldrxn a nnnnn set value of n register for channel a (LMR0 only) ldrxr a nnnnn set value of n register for channel a (LMR0 only) notes : 1. a pause of at least 50ms must be allowed between command strings (eeprom programming time) 2. in 'single' mode the unit is inoperative afte r a power down until either another valid single command is received, or mode is changed by a gochan, setpar or setser command. 'single' mode is intended for frequency agile applications. 3. when calculating the pll operating frequency fc = f (ref) x n / r, please note that the lmt0 has a 10mhz reference, while the LMR0 uses 13mhz 4. unlike most other radiometrix receivers, the LMR0 design places the local oscillator 21.4mhz above the channel frequency. n value must be calculated accordingly
radiometrix ltd lmt0/LMR0 data sheet page 7 default transmitter and receiver n, r values frequency txn txr rxn rxr 26.995mhz 1069 396 2658 714 27.045mhz 1144 423 2303 618 27.095mhz 970 358 1854 497 27.145mhz 1816 669 2782 745 27.195mhz 1716 631 3996 1069 27.255mhz 834 306 2560 684 khz mhz txr f f vctcxo comp 932961 . 27 358 10 ? ? ? comparison frequency (f comp ) >10khz 970 932961 . 27 095 . 27 ? ? ? khz mhz f rf txn comp 48.495mhz (lo) = 27.095mhz (rf) + 21.4mhz (if) khz mhz rxr f f vctcxo comp 156942 . 26 497 13 ? ? ? 1854 156942 . 26 4 . 21 095 . 27 ? ? ? ? ? khz mhz mhz f if rf rxn comp
radiometrix ltd lmt0/LMR0 data sheet page 8 condensed specifications frequency 26.995, 27.045, 27.095, 27.145, 27.195, 27.255mhz (standard) any 0.5mhz wide sub-band in 26-28mhz (general) frequency stability lmt0 LMR0 1.0khz 0.5khz channel spacing 10khz number of channels 6 channels (standard) 16 channels controlled by parallel port or 32 via serial 4v level uart interface operating temperature -20 oc to + 70 oc (storage -30 oc to +70 oc) spurious radiations compliant wi th etsi en 300 220-2 and en 301 489-3 meets fcc part 95 transmitter output power +10dbm (10mw) 1db nominal [factory fixed rf power variants] +20dbm (100mw) 1db nominal peak deviation 1.2khz tx on switching time 30ms from txe transition modulation type fsk (f3d) tx modulation bandwidth dc ? 4khz (cmos compatible) adjacent channel tx power <-37dbm tx spurious <-40dbm (<-54dbm in forbidden bands) no rf output in standby supply voltage 4.1v ? 15v current 40ma for 10mw transmission 100ma for 100mw transmission <5 ? a standby (txe high or floating) inputs data (cmos/ttl compatible) size 33 x 23 x 9mm interface user 10 (8) pin 0.1" pitch dual row (5+5) header rf 2pin 0.1? pitch recommended pcb hole size 1.2mm receiver sensitivity -115dbm for 12db sinad image, spurii <-60db blocking better than 90db lo re-radiation -70dbm supply voltage 3.1v ? 15v current 20ma receive <1 ? a standby (rxe low) outputs rssi, audio, data (quas i dc data recovery circuit) size 46 x 23 x 9 mm interface user 10 pin 0.1" pitch dual row (5+5) header rf 2pin 0.1? pitch recommended pcb hole size 1.2mm
radiometrix ltd lmt0/LMR0 data sheet page 9 rx received signal strength indicator (rssi) the LMR0 has wide range rssi that measures the st rength of an incoming signal over a range of 60db or more. this allows assessment of link quality and availabl e margin and is useful when performing range tests. the output on pin 5b of the module has a standing dc bias of up to 0.5v with no signal, rising to 2.2v at maximum indication (rf input levels of -40dbm and above). ? vmin-max is typically 2v and is largely independent of standing bias variations. output impedance is 40k ? . pin 5b can drive a 100 ? a meter directly, for simple monitoring. 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 rf level (dbm) rssi output (v) figure 6: typical rssi level with respec t to received rf level at LMR0 antenna pin ordering information: part no. description channel frequencies (mhz) rf power (mw) channel spacing (khz) data rate kbps LMR0-27-4 receiver lmt0-27-4 transmitter ch0: 26.995, ch1: 27.045mhz, ch2: 27.095, ch3: 27.145mhz, ch4: 27.195, ch5: 27.255mhz 10 10 4 lmt0-27-4-100mw transmitter ch0: 26.995, ch1: 27.045mhz, ch2: 27.095, ch3: 27.145mhz, ch4: 27.195, ch5: 27.255mhz 100 10 4 note: 25mw, 100mw version is intended for use in usa, au stralia, nz and only for model control in europe
radiometrix ltd hartcran house 231 kenton lane harrow, middlesex ha3 8rp england tel: +44 (0) 20 8909 9595 fax: +44 (0) 20 8909 2233 sales@radiometrix.com www.radiometrix.com copyright notice this product data sheet is the orig inal work and copyrighted property of radiometrix ltd. reproduction in whole or in part must give clear a cknowledgement to the copyright owner. limitation of liability the information furnished by radiometrix ltd is be lieved 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 lt d does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infri ngements of patents or other rights of third parties which may result from the us e 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 fini shed product on the market under the provisions of the r&tte directive. equipment within the scope of the r&tte di rective 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/ 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 information.requests@ofcom.org.uk european radiocommunications office (ero) peblingehus nansensgade 19 dk 1366 copenhagen tel. +45 33896300 fax +45 33896330 ero@ero.dk www.ero.dk
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