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chr2244-qdg rohs compliant ref. : dschr2244-qdg9030 - 30 jan 09 1/14 specifica tions subject to change without notice united monolithic semiconductors s.a.s. route dpartementale 128 - b.p.46 - 91401 orsay cede x france tel. : +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 33 03 09 5.8 ghz one antenna reflective transponder for tag gaas monolithic microwave ic description the chr2244 is a mmic transponder dedicated to short range communications at 5.8ghz. it includes all the rf functions for bi-directional transmissio n and cmos compatible interfaces. only one antenna is necessary. three modes are implemented: standby : ultra low current am detector, with a reduced bandwidth, providing a wake-up signal on sb_out output. this signal is a dc voltage. this output is active when and only when an am modulated rf signal is applied to the rf input. downlink : low current am detector, with optimized if bandwidth, providing the demodulated data at the cmos compatible data_out output. uplink : multiplier based on a passive reflective mixer. this circuit is manufactured on a mesfet process. it is supplied in plastic package (qfn-24) . main features 5.8ghz ism band operating frequency cmos compatible ultra low standby current integrated wake-up circuit high detection sensitivity for downlink reflective multiplier for uplink single bias voltage low cost & high performances plastic package lead-free, matt tin (green) solder plating det t/r mod wk_in data_out rf external components vcc sb_out transponder block diagram main characteristics tamb = +25c; vcc = 3.1v symbol parameter min typ max unit vcc_sb_i standby dc current ( without rf input signal) 8 14 a rf_sb_p rf_dl_p minimum power for standby mode minimum power for downlink mode -39 -39 -43 -43 dbm dbm bw_dl am demodulation frequency (downlink) 250 500 khz g_ul uplink multiplier gain (dsb) -6.5 -4 db bw_ul uplink if multiplier frequency band 0.1 10 m hz esd protections : electrostatic discharge sensitive device observe handling precautions !
chr2244-qdg 5.8 ghz one antenna reflective tag ref. : dschr2244-qdg9030 - 30 jan 09 2/14 specifica tions subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 electrical characteristics (full operating range) tamb = -30c to +80c symbol parameter test conditions min typ max unit fop operating rf frequency range (1) 5.725 5.8 5.87 5 ghz bw_rf rf bandwidth 50 mhz rl_rf (*) rf input return loss 50 w 12 7 db vcc bias voltage 2.7 3.1 3.6 v wk_in_imp (*) wk_in port impedance 6 10 k w pf t/r_imp (*) t/r input port impedance 100 10 k w pf t/r_t (*) transmit to receive recovery time 150 s r/t_t (*) receive to transmit recovery time 50 s (1) the centre frequency can be adjusted by a matc hing network located between the antenna and the rf component. (*) note : min & max values include technological spreads, s upply & temperature range effect. standby mode : t/r_v=0v , mod_v=0v , wk_in_v=0v symbol parameter test conditions min typ max unit sb_out_load standby output port load impedance 1 10 m w pf sb_out_v (*) standby output port dc voltage high level (1) low level vcc-1 0 vcc 1 v v rf_sb_bw amplitude modulation frequency of rf for wake-up 250 500 khz rf_sb_p (*) amplitude modulated rf input power for wake-up (2) -38 -43 dbm vcc_sb_i (*) standby dc current (3) 8 20 a (1) the sb_out voltage is high when the rf input si gnal is am modulated. (2) total transmitted power of the modulated signal (modulation index = 0.5) (3) without rf input signal (*) note : min & max values include technological spreads, s upply & temperature range effect.
5.8 ghz one antenna reflective tag chr2244-qdg ref. :dschr2244-qdg9030 - 30 jan 09 3/14 specifica tions subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 downlink mode : t/r_v=0v , mod_v=0v , wk_in_v=vcc symbol parameter test conditions min typ max unit data_out_load downlink output port load impedance cmos compatible data_out_f amplitude demodulation frequency 250 5 00 khz data_out_dc (*) data_out signal duty cycle 40 50 60 % rf_dl_p (*) amplitude modulated rf input power (1) -38 -43 dbm wk_in_i (*) wk_in dc current 200 500 a (1) total transmitted power of the modulated signal (modulation index = 0.5) (*) note : min & max values include technological spreads, s upply & temperature range effect. uplink mode : t/r_v =vcc , wk_in_v =vcc symbol parameter test conditions min typ max unit mod_imp (*) modulated signal input port impedance 100 10 k w pf mod_v modulated signal input port voltage square wave (1) 0/vcc mod_f uplink if multiplier frequency 0.1 10 mhz g_ul (*) uplink multiplier gain (dsb) -7 -4 db wk_in_i (*) wk_in dc current 200 500 a (1) the shape of the modulated signal can be optimi zed if better linearity is needed. (*) note : min & max values include technological spreads, s upply & temperature range effect. absolute maximum ratings (1) tamb = -30c to +80c symbol parameter values unit vcc bias voltage 5 v wk_in_v wk_in input voltage 5 v t/r_v t/r input voltage 5 v mod_v mod input voltage 5 v rf_sb_p rf_dl_p maximum standby and downlink rf input power (2) +10 dbm top operating temperature range -30 to +80 c tstg storage temperature range -55 to +125 c (1) operation of this device above anyone of these parameters may cause permanent damage. (2) duration < 1s.
chr2244-qdg 5.8 ghz one antenna reflective tag ref. : dschr2244-qdg9030 - 30 jan 09 4/14 specifica tions subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 package outline (1) pin number pin name description 4, 5, 6, 8, 9, 10, 16, 18, 23, 24 non connected 1 rf rf port 2 t/r transmit / receive input port 3 mod modulation input port 7 sens stand-by sensitivity adjust port 11 vcc supply voltage 12 ga_sb stand-by amplifiers gain adjust port 13 sb_out stand-by output port 14 c4 external decoupling 15 data_out downlink output port 17 wk_in supply voltage input port for wake-up 19 ad wake-up threshold adjust port 20 ga_wk wake-up amplifiers gain adjust port (optional) 21 cg external decoupling 22 fd external decoupling 25 slug gnd ground (1) the package outline drawing included to this data-s heet is given for indication. refer to the application note an0017 available at http://www.ums-gaas.com for exact package dimensions.
5.8 ghz one antenna reflective tag chr2244-qdg ref. :dschr2244-qdg9030 - 30 jan 09 5/14 specifica tions subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 external components important notice all the components placed in the eval board area are optional. other components make up the nominal environment wh ere the specifications are guaranteed. design recommendations
chr2244-qdg 5.8 ghz one antenna reflective tag ref. : dschr2244-qdg9030 - 30 jan 09 6/14 specifica tions subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 all of the different inputs (tr, mod) and outputs (sb_out, data_out) should be properly isolated (separated enough or with a ground path between the m). as t/r port is the most sensitive one, a specific circuit (see on diagram) can be used for high level of isolation. device slug should be connected to rf ground plane through multiples vias (>=9). an external matching may be required to optimize r f performances on 50 w impedance, versus substrate height. a rf ground plane height of 0.008 (0.203mm) under the component (evaluation board) provides the highest rf performances thanks to low rf ground inductance and low pin to pin coupling. adjustment abilities pin number pin name component description 7 sens r3 standby sensitivity adjust port: a value lower than 2.2m w decreases standby chain sensitivity. 12 ga_sb r4 standby amplifiers gain adjust por : a value lower than 680k w increases standby chain sensitivity. 19 ad r5 downlink threshold adjust port: a value lower than 6.8m w decreases downlink chain sensitivity. 20 ga_wk r6 downlink amplifiers gain adjust port: a value lower than 220 k w increases downlink chain sensitivity. important notice : all this adjustments may cause non linear response of the performances versus resistors values. the sensitivity is C1x (minimum rf power for considered mode). indeed, a decrease of the sensitivity means an increase of the minimum rf power for consi dered mode.
5.8 ghz one antenna reflective tag chr2244-qdg ref. :dschr2244-qdg9030 - 30 jan 09 7/14 specifica tions subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 adjustment abilities characterization typical performance, tamb = +25c, vcc = 3.1v standby sensitivity the maximum value of r3 resistor is 2.2m w . it could be used in order to reduce the standby sensitivity. the r4 resistor should be used to set the standby sensitivity higher or lower. the following table gives the typical relation between r3, r4 and the standby sensitivity. r3 (m w ww w ) r4 (k w ww w ) sensitivity (db) >2.2 indifferently non guaranteed functionality 2.2 100 s + 1.5 db 2.2 220 s + 1 db 2.2 390 s + 0.5 db 2.2 (*) 680 (*) s (*) 2.2 1200 s - 0.5 db 2.2 3300 s - 1.5 db 2.2 6800 s - 3 db 2.2 no resistor s - 4 db 1.5 no resistor s - 5 db (*) s is the sensitivity of a given chip in the rec ommended environment. in the full operating range and the recommended env ironment, -|s| < -38 dbm in accordance with the electrical characteristics. downlink sensitivity r5 could be used in order to reduce the downlink se nsitivity or to set the compromise between sensitivity and unwanted data, when no rf signal, d ue to noise or parasitic coupling. the r6 resistor should be used to set the downlink sensiti vity higher or lower. the following table gives the typical relation between r5, r6 and the downlink se nsitivity. r5 (m w ww w ) r6 (k w ww w ) sensitivity (db) no resistor 10 s + 2 db no resistor 47 s + 1.5 db no resistor 220 s + 1 db no resistor no resistor s + 0.5 db 6.8 (*) no resistor (*) s (*) (1) 4.7 no resistor s - 1 db 3.3 no resistor s - 2 db 2.2 no resistor s - 3 db 1.5 no resistor s - 4 db 1 no resistor s - 5 db (*) s is the sensitivity of a given chip in the rec ommended environment. in the full operating range and the recommended env ironment, -|s| < -38 dbm in accordance with the electrical characteristics. (1) a higher sensitivity than in recommended config uration may cause significant density of unwanted data when rf is not modulated. these data are random because of the component nois e floor proximity, or can be sensitive to an environment perturbation.
chr2244-qdg 5.8 ghz one antenna reflective tag ref. : dschr2244-qdg9030 - 30 jan 09 8/14 specifica tions subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 frequency response characterization typical performance, tamb = +25c, vcc = 3.1v, reco mmended environment standby sensitivity versus am frequency : -12 -10,5 -9 -7,5 -6 -4,5 -3 -1,5 0 10 100 1000 10000 am frequency (khz) sensitivity (dbrel) downlink sensitivity versus am frequency : -12 -10,5 -9 -7,5 -6 -4,5 -3 -1,5 0 10 100 1000 10000 am frequency (khz) sensitivity (dbrel)
5.8 ghz one antenna reflective tag chr2244-qdg ref. :dschr2244-qdg9030 - 30 jan 09 9/14 specifica tions subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 evaluation board important notice / design recommendations device slug should be connected to rf ground plane through multiples vias (>=9). an external matching may be required to optimize rf performances on 50 w impedance, versus substrate height. a rf ground plane height of 0.008 (0.203mm) under the component (evaluation board) provides the highest rf performances thanks to low rf ground ind uctance and low pin to pin coupling.
chr2244-qdg 5.8 ghz one antenna reflective tag ref. : dschr2244-qdg9030 - 30 jan 09 10/14 specific ations subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 application information general transmission system the transmission system is described as following, the tag doesnt generate any frequency: fo f-am transmit mode receive mode receive mode transmit mode fo fm fo beacon tag downlink figure 1a uplink figure 1b beacon tag figure 1: transmission system operating principle two modes of communication are implemented from beacon to tag (figure 1a): the beacon is in tr ansmit mode while the tag is in the receive mode. the beacon sends an amplitude modulated (am) rf sig nal to the tag. in figure 1a, f-am is the amplitude modulation frequency and f0 is the carrie r. from tag to beacon (figure 1b): the beacon is in re ceive mode while the tag is in transmit mode. the beacon sends a continuous wave (cw) rf signal to th e tag, this signal is then mixed (at tag level) wit h the mod input signal (fm) thanks to a reflective mi xer. the reflected signal is sent back to the beaco n and is demodulated thanks to an homodyne receiver.
5.8 ghz one antenna reflective tag chr2244-qdg ref. :dschr2244-qdg9030 - 30 jan 09 11/14 specific ations subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 tag operating modes within this transmission system, the chr2244 operat es in three basic modes depending on the wk_in and t/r input signal levels. they are described her eafter: 1 - the standby mode (figures 2a; 2b and 2c) is a very low power consum ption state. in this mode an amplitude modulated rf signal is necessary to pr oduce a dc voltage at the sb_out output which may be used to wake-up the chr2244 by applying vcc to the wk_in input. figure 2a: standby mode the received am modulated rf spectrum is the follow ing (figure 2b), versus the modulation index (m). this plot is done for the minimum am modulated rf i nput power ( -40 dbm ) and only for an ideal spectrum with only 2 rows ( 5.7995 and 5.8005 ghz ) i.e. the 5.8 ghz carrier am modulated with a 500 khz signal. 7db 9db 12db 5.8005ghz 5.7995ghz 5.8ghz m=0.5 5.8ghz 5.8ghz -40dbm m=0.7 m=0.9 5.8005ghz 5.7995ghz 5.8005ghz 5.7995ghz figure 2b: am modulated rf spectrum if 500khz rf 5,8ghz modulator attenuator chr2244 +v oscilloscope sb_out figure 2c: standby test bench diagram det t/r 0v or hi mod 0v or hi wk_in 0v or hi data_out rf in am modulated sb_out to controller data from controller rf-in am modulated t/r 0v wk_in 0v sb_out vcc
chr2244-qdg 5.8 ghz one antenna reflective tag ref. : dschr2244-qdg9030 - 30 jan 09 12/14 specific ations subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 2 - when the wk_in is set to vcc (tr remaining at 0v), the chr2244 switches to the downlink mode (figure 3a), allowing an optimized bandwidth for th e demodulation. the received data is demodulated and accessible at the data_out output. figure 3a: downlink mode the received am modulated rf spectrum is as in stan dby mode. if 500khz rf 5,8ghz modulator attenuator chr2244 +v +wk_in oscilloscope dat a_out sb_out figure 3b: downlink test bench diagram vcc det t/r 0v mod 0v wk_in vcc data_out to controller rf in am modulated sb_out data from co ntroller t/r 0v wk_in 3v data_out rf-in am modulated
5.8 ghz one antenna reflective tag chr2244-qdg ref. :dschr2244-qdg9030 - 30 jan 09 13/14 specific ations subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 3 - in the uplink mode (figure 4a), the received cw carrier (f0) is multip lied with the modulation signal (fm) coming from mod input. in fact, if etsi cen tc278 recommendation is applied, the modulation is around the sub-carrier fm. the result ing reflected signal is a transposition of fm aroun d the carrier f0 (f0 fm) . figure 4a: uplink mode rf 5,8ghz attenuator spec trum analyser chr2244 +v t/ r mod if 500khz wk_in figure 4b: uplink test bench diagram det t/r vcc modulated 2mhz sub- carrier wk_in vcc data_out vcc sb_out rf in 5.8ghz cw data from controller rf out product of 5.8ghz x modulated sub-carrier rf-in t/r 3v wk_in 3v rf_out spectrum modulated sub-carrier around carrier carrier
chr2244-qdg 5.8 ghz one antenna reflective tag ref. : dschr2244-qdg9030 - 30 jan 09 14/14 specific ations subject to change without notice route dpartementale 128 , b.p.46 - 91401 orsay ce dex - france tel.: +33 (0)1 69 33 03 08 - fax : +33 (0)1 69 3 3 03 09 4 - i/o configuration summary t/r wk_in rf_in sb_out data_out mod standby 0v or high impedance 0v or high impedance am signal >vcc-1v cw or no signal <1v downlink 0v vcc cmos uplink vcc vcc input : cw output : fm around the carrier modulation signal (fm) am: amplitude modulated cw: continuous wave ordering information qfn 4x4 rohs compliant package : chr2244-qdg/xy stick: xy = 20 tape & reel: xy = 21 information furnished is believed to be accurate an d reliable. however united monolithic semiconductors s.a.s. assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by impli cation or otherwise under any patent or patent rights of united monolithic semiconductors s.a.s. . specifications mentioned in this publication are subject to change without notice. this publication supersedes and re places all information previously supplied. united monolithic semiconductors s.a.s. products are not authorized for use as critical components in life support devices or s ystems without express written approval from united monolithic semiconductors s.a.s.

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