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EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 1 of 14 evb description rev. 011 june/07 features ! double-conversion superhet architecture for low high degree of image rejection ! fsk for digital data and fm reception for analog signal transmission ! fsk/fm demodulation with phase-coincidence demodulator ! low current consumption in acti ve mode and very low standby current ! switchable lna gain for improved dynamic range ! rssi allows signal strength indication and ask detection ordering information part no. EVB71112-868-fsk-c EVB71112-915-fsk-c EVB71112-868-ask-c EVB71112-915-ask-c application examples ! tire pressure monitoring systems (tpms) ! remote keyless entry (rke) ! wireless access control ! alarm and security systems ! garage door openers ! remote controls " home and building automation ! low-power telemetry systems evaluation board general description the th71112 fsk/fm/ask double-conversion superheterodyne receiver ic is designed for applications in the european 868 mhz industrial-scientific-medica l (ism) band, according to the en 300 220 telecommunications standard. it can also be used for any other system with carrier frequencies ranging from 750 mhz to 990 mhz (e.g. for applications to fcc part 15).
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 2 of 14 evb description rev. 011 june/07 document content 1 theory of op eration ................................................................................................... 3 1.1 general........................................................................................................................ ..... 3 1.2 evb technical data overview ......................................................................................... 3 1.3 block diagram .................................................................................................................. 4 1.4 mode configurations ........................................................................................................ 4 1.5 lna gain control ............................................................................................................ 4 1.6 frequency planning.......................................................................................................... 4 1.6.1 selected fr equency pl ans....................................................................................................... .... 5 1.6.2 maximum frequen cy cove rage................................................................................................... 5 2 application circuits ................................................................................................... 6 2.1 fsk application circuit..................................................................................................... 6 2.1.1 circuit diagram fo r fsk rec eption.............................................................................................. 6 2.1.2 board component va lues fo r fsk .............................................................................................. 7 2.1.3 component arrangement top si de for fsk re ception .............................................................. 8 2.2 ask application circuit..................................................................................................... 9 2.2.1 circuit diagram fo r ask rec eption ............................................................................................. 9 2.2.2 board component va lues fo r ask ............................................................................................ 10 2.2.3 component arrangement top side for ask re ception ............................................................ 11 3 evaluation boar d layouts ....................................................................................... 12 4 board va riants.......................................................................................................... 12 5 package descr iption ................................................................................................ 13 5.1 soldering information ..................................................................................................... 13 6 disclai mer ................................................................................................................. 14
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 3 of 14 evb description rev. 011 june/07 1 theory of operation 1.1 general with the th71112 receiver chip, various circuit configur ations can be arranged in order to meet a number of different customer requirements. for fm/fsk rec eption the if tank used in the phase coincidence demodulator can also be constituted by a ceramic di scriminator with a varactor diode to create an afc circuit. in ask configuration, the rssi signal is f ed to an ask detector, which is constituted by the operational amplifier. the superheterodyne configuration is double conversion where mix1 and mi x2 are driven by the internal local oscillator signals lo1 and lo2, respectively. this allows a high degree of image rejection, achieved in conjunction with an rf front-end filter. efficient rf front -end filtering is realized by using a saw, ceramic or helix filter in front of the lna and by adding an lc filter at the lna output. a single-conversion variant, called th71111, is also avail able. both receiver ics hav e the same die. at the th71111 the second mixer mix2 operates as an amplifier. the th71112 receiver ic consists of the following building blocks: # pll synthesizer (pll synth) for generation of the first and second local oscillator signals lo1 and lo2, parts of the pll synth are: the high-frequenc y vco1, the feedback dividers div_16 and div_2, a phase-frequency detector (pfd) with charge pump (cp) and a crystal-based reference oscillator (ro) # low-noise amplifier (lna) for hi gh-sensitivity rf signal reception # first mixer (mix1) for down-conversion of the rf signal to the first if (if1) # second mixer (mix2) for down-conversi on of the if1 to the second if (if2) # if amplifier (ifa) to amplify and lim it the if2 signal and for rssi generation # phase coincidence demodulator (demod) with thir d mixer (mix3) to demodulate the if signal # operational amplifier (oa) for dat a slicing, filtering and ask detection # bias circuitry for bandgap biasing and circuit shutdown 1.2 evb technical data overview ! input frequency range: 750 mhz to 990 mhz ! power supply range: 2.3 v to 5.5 v @ ask 2.7 v to 5.5 v @ fsk ! temperature range: -40 c to +85 c ! standby current: 50 na ! operating current: 7.5 ma @ low gain mode 9.2 ma @ high gain mode ! sensitivity: -109 dbm @ ask 1) -103 dbm @ fsk 2) ! range of first if1: 10 mhz to 80 mhz ! range of first if2: 400 khz to 22 mhz ! maximum input level: -10 dbm @ ask 0 dbm @ fsk ! image rejection: > 60 db (e.g. with 868.3 mhz saw front-end filter and at 10.7 mhz if2) ! spurious emission: < -70 dbm ! input frequency acceptance range: up to 100 khz ! rssi range: 70 db ! fm/fsk deviation range: 2.5 khz to 80 khz ! maximum analog modulation frequency: 15 khz 1) at 4 kbps nrz, ber = 3 ? 10 -3 , 180 khz if filter bw, incl. 3 db saw front-end-filter loss 2) at 4 kbps nrz, ber = 3 ? 10 -3 , 20 khz fsk deviation, 180 khz if filter bw, incl. 3 db saw front-end- filter loss for more detailed information, please refer to the latest th71112 data sheet revision
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 4 of 14 evb description rev. 011 june/07 1.3 block diagram fig. 1: th71112 block diagram 1.4 mode configurations enrx mode description 0 rx standby rx disabled 1 rx active rx enable note: enrx are pulled down internally 1.5 lna gain control v gain_lna mode description < 0.8 v high gain lna set to high gain > 1.4 v low gain lna set to low gain note: hysteresis between gain modes to ensure stability 1.6 frequency planning frequency planning is straightforward for single-conver sion applications because there is only one if that can be chosen, and then the only possible choice is low-si de or high-side injection of the lo signal (which is now the one and only lo signal in the receiver). the receiver?s double-conversion architecture requi res careful frequency planning. besides the desired rf input signal, there are a number of spurious signal s that may cause an undesired response at the output. among them are the image of the rf si gnal (that must be suppressed by t he rf front-end filter), spurious signals injected to the first if (if1) and their images wh ich could be mixed down to the same second if (if2) as the desired rf signal (they must be suppressed by t he lc filter at if1 and/or by low-crosstalk design). mix2 mix1 12 in_lna lna gain_lna out_lna 4 3 31 2 vee_lnac 8 vcc_mix 5 in_mix1 67 11 if2 out_mix2 vee_if 13 in_ifa fbc1 17 27 28 26 if1 if1p if1n 10 9 vcc_lna vee_lna lo2 lo1 25 vcc_bias vcc_pll 1 enrx bias 30 vee_bias vee_ro vco1 div16 div2 pfd ro 22 ro lf 29 cp 32 18 19 oap oan out_oa oa 20 14 15 16 out_ifa 23 24 outp outn in_dem mix3 ifa rssi 21 vee_mix
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 5 of 14 evb description rev. 011 june/07 by configuring the th71112 for double conversion and using its internal pll synthes izer with fixed feedback divider ratios of n1 = 16 (div_16) and n2 = 2 (div_2), four types of down-conver sion are possible: low-side injection of lo1 and lo2 ( low-low ), lo1 low-side and lo2 high-side ( low-high ), lo1 high-side and lo2 low-side ( high-low ) or lo1 and lo2 high-side ( high-high ). the following table summarizes some equations that are useful to calculate the crystal reference frequenc y (ref), the first if (if1) and the vco1 or first lo frequency (lo1), respectively, for a given rf and second if (if2). injection type high-high low-low high-low low-high ref (rf ? if2)/30 (rf ? if2)/34 (rf + if2)/30 (rf + if2)/34 lo1 32 ? ref 32 ? ref 32 ? ref 32 ? ref if1 lo1 ? rf rf ? lo1 lo1 ? rf rf ? lo1 lo2 2 ? ref 2 ? ref 2 ? ref 2 ? ref if2 lo2 ? if1 if1 ? lo2 if1 ? lo2 lo2 ? if1 1.6.1 selected frequency plans the following table depicts crystal, lo and image si gnals considering the examples of 868.3 mhz and 915 mhz rf reception at if2 = 10.7 mhz. the colu mns in bold depict the selected frequency plans to receive at 868.3 mhz and 915 mhz, respectively. signal type rf = 868.3 mhz rf = 868.3 mhz rf = 868.3 mhz rf = 868.3 mhz rf = 915 mhz rf = 915 mhz rf = 915 mhz rf = 915 mhz injection type high-high low-low high-low low-high high-high low-low high-low low-high ref / mhz 28.58667 25.22353 29.3 25.85294 30.14333 26.59706 30.85667 27.22647 lo1 / mhz 914.77333 807.15294 937.6 827.29412 964.58667 851.10588 987.41333 871.24706 if1 / mhz 46.47333 61.14706 69.3 41.00588 49.58667 63.89412 72.41333 43.75294 lo2 / mhz 57.17333 50.44706 58.6 51.70588 60.28667 53.19412 61.71333 54.45294 rf image/mhz 961.24667 746.00588 1006.9 786.28824 1014.17 787.21176 1059.83 827.49412 if1 image/mhz 67.87333 39.74706 47.9 62.40588 70.98667 42.49412 51.01333 65.15294 1.6.2 maximum frequency coverage parameter f min f max injection type high-low low-low rf / mhz 739.3 998.825 ref / mhz 25.0 29.0625 lo1 / mhz 800 930 if1 / mhz 60.7 68.825 lo2 / mhz 50.0 58.125 if2/ mhz 10.7 10.7 the selection of the reference crystal frequency is based on some assumptions. as for example: the first if and the image frequencies should not be in a radio band where strong interfering signals might occur (because they could represent parasitic receiving signals), the lo1 signal should be in the range of 800 mhz to 930 mhz (because this is the optimum frequency range of the vco1). furthermore the first if should be as high as possible to achieve highest rf image rejection.
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 6 of 14 evb description rev. 011 june/07 2 application circuits 2.1 fsk application circuit 2.1.1 circuit diagram for fsk reception circuit features ? tolerates input frequency variations ? well-suited for nrz, manchester and similar codes cerfil outp vee out_lna in_mix1 vee if1p if1n vcc gain_lna vee out_mix2 in_ifa fbc1 fbc2 vcc out_ifa lf vee in_lna vcc vee enrx vcc vcc vee oap oan out_oa rssi 32 31 30 29 28 27 26 25 17 18 19 20 21 22 23 24 9 10 11 12 13 14 15 16 8 1234567 ro vcc vcc c12 cerdis xtal out_oa gnd fsk output cb3 c11 c10 vcc c9 cb4 cb5 cb1 12 gnd vcc 1 2 cb6 rssi gnd 12 outp gnd 12 c15 c16 r4 r5 cb2 vcc c1 c_ro r2 gnd enrx vcc ro gnd 1 2 2 13 cb7 c7 cb8 c17 l4 l5 c8 th71112 c5 c4 l2 sawfil 1 3 4 6 l1 in_lna 50 c3 r1 l3
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 7 of 14 evb description rev. 011 june/07 2.1.2 board component values for fsk part size value @ 868.3 mhz value @ 915 mhz tolerance description c1 0805 22 pf 22 pf 5% crystal series capacitor c3 0603 1 nf 1 nf 10% loop filter capacitor c4 0603 4,7 pf nip 5% capacitor to match saw filter input c5 0603 2.7 pf nip 5% capacitor to match saw filter output c7 0603 1.0 pf 0.68 pf 5% mix1 input matching capacitor c8 0603 22 pf 22 pf 5% if1 tank capacitor c9 0603 33 nf 33 nf 10% ifa feedback capacitor c10 0603 1 nf 1 nf 10% ifa feedback capacitor c11 0603 1 nf 1 nf 10% ifa feedback capacitor c12 0805 10 pf 10 pf 5% demod phase-shift capacitor c15 0805 100 pf 100 pf 5% demodulator output low-pass capacitor, this value for data rates < 20 kbps nrz, for higher data rates decrease the value c16 0805 1.5 nf 1.5 nf 10% rssi output low-pass capacitor c17 0805 10 nf 10 nf 10% data slicer capacitor, this value for data rates > 0.8 kbps nrz, for lower data rates increase the value cb1 to cb5 cb7 to cb8 0603 330 pf 330 pf 10% de-coupling capacitor cb6 0805 33 nf 33 nf 10% de-coupling capacitor c_ro 0603 330 pf 330 pf 5% optional capacitor, to couple external ro signal r1 0805 10 k 10 k 5% loop filter resistor r2 0603 330 330 5% optional cerfil output matching resistor r4 0805 330 k 330 k 5% data slicer resistor r5 0805 220 k 220 k 5% loading resistor l1 0603 22 nh 0 5% l2 0603 22 nh 0 5% saw filter matching inductor from wrth-elektronik (we-ki series), or equivalent part l3 0603 10 nh 10 nh 5% lna output tank inductor from wrth-elek- tronik (we-ki series), or equivalent part l4 0603 100 nh 100 nh 5% l5 0603 100 nh 100 nh 5% if1 tank inductor from wrth-elektronik (we-ki series), or equivalent part smd 6x3.5 fundamental-mode crystal from telcona/horizon (hex22 series) or equivalent part xtal hc49 smd 25.22353 mhz @ rf = 868.3 mhz 26.59706 mhz @ rf = 915 mhz 25ppm cal. 30ppm temp. fundamental-mode crystal, c load = 10 pf to 15 pf, c 0, max = 7 pf, r 1, max = 50 l smd 3x3 safcc868msl0x00 (f 0 =868.3 mhz) b 3db = 2 mhz sawfil smd 3.8x3.8 safch915mal0n00 (f 0 = 915 mhz) b 3db = 40 mhz low-loss saw filter from murata or equivalent part cerfil smd 3.45x3.1 sfecf10m7ha00 b 3db = 180 khz ceramic filter from murata, or equivalent part cerdis smd 4.5x2 cdscb10m7ga135 ceramic discriminator from murata, or equivalent part
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 8 of 14 evb description rev. 011 june/07 2.1.3 component arrangement top side for fsk reception 1 11 1 1 1 board size is 42.7mm x 37.5mm evb711xx_4 melexis out_oa rssi outn outp ro enrx v cc in_lna cb6 l1 c4 l4 l5 cb7 cb8 l3 c7 c8 cb5 cb1 r1 c3 l2 cb2 c-ro c1 c15 r5 c16 r4 0 c17 cb3 cerdis 0 c12 cb4 c9 c10 c11 c5 th71112 8 1 16 17 24 25 32 9 r2 rf_input xtal
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 9 of 14 evb description rev. 011 june/07 2.2 ask application circuit 2.2.1 circuit diagram for ask reception vcc vcc xtal out_oa gnd a sk output cb3 12 vcc 1 2 cb6 rssi gnd 12 r4 cb2 vcc c1 gnd enrx vcc ro gnd 1 2 2 13 cb7 cb8 c16 c17 l4 l5 c8 cerfil outp vee out_lna in_mix1 vee if1p if1n vcc gain_lna vee out_mix2 in_ifa fbc1 fbc2 vcc out_ifa lf vee in_lna vcc vee enrx vcc vcc vee oap oan out_oa rssi 32 31 30 29 28 27 26 25 17 18 19 20 21 22 23 24 9 10 11 12 13 14 15 16 8 1234567 ro c11 c10 vcc c9 cb4 cb5 cb1 gnd r2 c7 th71112 c_ro c5 c4 l2 sawfil 1 3 4 6 l1 in_lna 50 c3 r1 l3
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 10 of 14 evb description rev. 011 june/07 2.2.2 board component values for ask part size value @ 868.3 mhz value @ 915 mhz tolerance description c1 0805 22 pf 22 pf 5% crystal series capacitor c3 0603 1 nf 1 nf 10% loop filter capacitor c4 0603 4,7 pf nip 5% capacitor to match saw filter input c5 0603 2.7 pf nip 5% capacitor to match saw filter output c7 0603 1.0 pf 0.68 pf 5% mix1 input matching capacitor c8 0603 22 pf 22 pf 5% if1 tank capacitor c9 0603 33 nf 33 nf 10% ifa feedback capacitor c10 0603 1 nf 1 nf 10% ifa feedback capacitor c11 0603 1 nf 1 nf 10% ifa feedback capacitor c16 0805 1.5 nf 1.5 nf 10% rssi output low-pass capacitor, this value for data rates < 10 kbps nrz, for higher data rates decrease the value c17 0805 10 nf 10 nf 10% data slicer capacitor, this value for data rates > 0.8 kbps nrz, for lower data rates increase the value cb1 to cb5 cb7 to cb8 0603 330 pf 330 pf 10% de-coupling capacitor cb6 0805 33 nf 33 nf 10% de-coupling capacitor c_ro 0603 330 pf 330 pf 5% optional capacitor, to couple external ro signal r1 0805 10 k 10 k 5% loop filter resistor r2 0603 330 330 5% optional cerfil output matching resistor r4 0805 330 k 330 k 5% data slicer resistor l1 0603 22 nh 0 5% l2 0603 22 nh 0 5% saw filter matching inductor from wrth-elektronik (we-ki series), or equivalent part l3 0603 10 nh 10 nh 5% lna output tank inductor from wrth-elek- tronik (we-ki series), or equivalent part l4 0603 100 nh 100 nh 5% l5 0603 100 nh 100 nh 5% if1 tank inductor from wrth-elektronik (we-ki series), or equivalent part smd 6x3.5 fundamental-mode crystal from telcona/horizon (hex22 series) or equivalent part xtal hc49 smd 25.22353 mhz @ rf = 868.3 mhz 26.59706 mhz @ rf = 915 mhz 25ppm cal. 30ppm temp. fundamental-mode crystal, c load = 10 pf to 15 pf, c 0, max = 7 pf, r 1, max = 50 l smd 3x3 safcc868msl0x00 (f 0 =868.3 mhz) b 3db = 2 mhz sawfil smd 3.8x3.8 safch915mal0n00 (f 0 = 915 mhz) b 3db = 40 mhz low-loss saw filters from murata or equivalent part cerfil smd 3.45x3.1 sfecf10m7ha00 b 3db = 180 khz ceramic filter from murata, or equivalent part
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 11 of 14 evb description rev. 011 june/07 2.2.3 component arrangement top side for ask reception 1 1 1 1 1 board size is 42.7mm x 37.5mm evb711xx_4 melexis out_oa rssi outn outp ro enrx v cc in_lna cb6 l1 c4 l4 l5 cb7 cb8 l3 c7 c8 cb5 cb1 r1 c3 l2 cb2 c-ro c1 c16 0 c17 cb3 cb4 c9 c10 c11 r4 c5 th71112 8 1 16 17 24 25 32 9 r2 rf_input xtal
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 12 of 14 evb description rev. 011 june/07 3 evaluation board layouts board layout data in gerber format is available, board size is 37.5mm x 42.7mm. 4 board variants type frequency/mhz modulation board execution EVB71112 ?315 ?fsk ?a antenna version ?433 ?ask ?c connector version ?868 ?fm ?915 note: available evb setups pcb top view pcb bottom view evb711xx_4 melexis out_oa rssi outn outp ro enrx vcc in_lna melexis
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 13 of 14 evb description rev. 011 june/07 5 package description the device th71112 is rohs compliant. fig. 2: lqfp32 (low profile quad flat package) all dimension in mm, coplanarty < 0.1mm e1, d1 e, d a a1 a2 e b c l min 1.40 0.05 1.35 0.30 0.09 0.45 0 max 7.00 9.00 1.60 0.15 1.45 0.8 0.45 0.20 0.75 7 all dimension in inch, coplanarty < 0.004? min 0.055 0.002 0.053 0.012 0.0035 0.018 0 max 0.276 0.354 0.063 0.006 0.057 0.031 0.018 0.0079 0.030 7 5.1 soldering information ? the device th71112 is qualified for msl3 with soldering peak temperature 260 deg c according to jedec j-std-2. 1 32 25 17 24 8 9 16 d d1 e1 e b e a2 a a1 l c 0.25 (0.0098) 12 1 + 12 1 + .10 (.004)
EVB71112 868/915mhz receiver evaluation board description 39012 71112 01 page 14 of 14 evb description rev. 011 june/07 6 disclaimer 1) the information included in this documentation is subject to melexis intellectual and other property rights. reproduction of information is permissible only if the information will not be altered and is accom- panied by all associated conditions, limitations and notices. 2) any use of the documentation wit hout the prior written consent of me lexis other than the one set forth in clause 1 is an unfair and deceptive business practice. me lexis is not responsible or liable for such al- tered documentation. 3) the information furnished by melexis in this document ation is provided ?as is?. except as expressly war- ranted in any other applicable license agreement, melexi s disclaims all warranties either express, im- plied, statutory or otherwise incl uding but not limited to the merchantab ility, fitness for a particular pur- pose, title and non-infringement with regard to the content of this documentation. 4) notwithstanding the fact that me lexis endeavors to take care of t he concept and content of this docu- mentation, it may include technical or factual inaccu racies or typographical errors. melexis disclaims any responsibility in connection herewith. 5) melexis reserves the right to change the documentat ion, the specifications and prices at any time and without notice. therefore, prior to designing this product into a system, it is necessary to check with melexis for current information. 6) melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special in- cidental or consequential damages, of any kind, in connec tion with or arising out of the furnishing, per- formance or use of the information in this documentation. 7) the product described in this documentation is in tended for use in normal commercial applications. ap- plications requiring operation beyond ranges specified in this documentation, unusual environmental re- quirements, or high reliability applications, such as military, medical life-support or life-sustaining equip- ment are specifically not recommended without additi onal processing by melexis for each application. 8) any supply of products by melexis will be gov erned by the melexis terms of sale, published on www.melexis.com . ? melexis nv. all rights reserved. for the latest version of this document, go to our website at: www.melexis.com or for additional information contact melexis direct: europe, africa: americas: asia: phone: +32 1367 0495 phone: +1 603 223 2362 phone: +32 1367 0495 e-mail: sales_europe@melexis.com e-mail: sales_usa@melexis.com e-mail: sales_asia@melexis.com iso/ts 16949 and iso14001 certified

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