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TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 1 of 20 nov. 2001 3901071112 rev. 005 features ! double superhet architecture for high degree of image rejection ! fsk for digital data and fm reception for analog signal transmission ! fm/fsk demodulation with phase-coincidence demodulator ! low current consumption in active mode and very low standby current ! switchable lna gain for improved dynamic range ! rssi allows signal strength indication and ask detection ! surface mount package lqfp32 ordering information part no. temperature range package TH71112 -40 c to 85c lqfp32 application examples ! general digital and analog 868 mhz or 915 mhz ism band usage ! low-power telemetry ! alarm and security systems ! keyless car and central locking ! pagers technical data overview ! input frequency range: 800 mhz to 930 mhz ! power supply range: 2.5 v to 5.5 v ! temperature range: -40 c to +85 c ! operating current: 7.5 ma at low gain and 9.2 ma at high gain mode ! standby current: < 100 na ! sensitivity: -109 dbm 1) with 40 khz second if filter bw (incl. saw front-end filter loss) ! sensitivity: -102 dbm 2) with 150 khz second if filter bw (incl. saw front-end filter loss) ! range of first if: 10 mhz to 80 mhz ! range of second if: 455 khz to 21.4 mhz ! maximum input level: ?10 dbm at ask and 0 dbm at fsk ! image rejection: > 65 db (e.g. with saw front-end filter and at 10.7 mhz 2 nd if) ! spurious emission: < -70 dbm ! input frequency acceptance: 50 khz (with afc option) ! rssi range: 70 db ! frequency deviation range: 5 khz to 120 khz ! maximum data rate: 80 kbit/s nrz ! maximum analog modulation frequency: 15 khz 1) at 8 khz fsk deviation, ber = 3 ? 10 -3 and phase-coincidence demodulation 2) at 50 khz fsk deviation, ber = 3 ? 10 -3 and phase-coincidence demodulation
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 2 of 20 nov. 2001 3901071112 rev. 005 general description 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-frequency 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 high-sensitivity rf signal reception " first mixer (mix1) for down-conversion of the rf signal to the if1 " second mixer (mix2) for down-conversion of the if1 to the second if (if2) " if amplifier (ifa) to amplify and limit the if signal and for rssi generation " phase coincidence demodulator (demod) with third mixer (mix3) to demodulate the if signal " operational amplifier (oa) for data slicing, filtering and ask detection " bias circuitry for bandgap biasing and circuit shutdown with the TH71112 receiver chip, various circuit configurations can be arranged in order to meet a number of different customer requirements. for fm/fsk reception the if tank used in the phase coincidence demodu- lator can be constituted either by a ceramic resonator or an lc tank (optionally with a varactor diode to create an afc circuit). in ask configuration, the rssi signal is feed to an ask detector, which is constituted by the operational amplifier. demodulation type of receiver fm / fsk narrow-band rx with ceramic demodulation tank fm / fsk wide-band rx with lc demodulation tank ask rx with rssi-based demodulation the superheterodyne configuration is double conversion where mix1 and mix2 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 frontend filter. efficient rf frontend 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 available. both rxics have the same die. at the th71111 the second mixer mix2 operates as an amplifier.
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 3 of 20 nov. 2001 3901071112 rev. 005 block diagram fig. 1: TH71112 block diagram in_lna lna mix1 ifa gain_lna out_lna fpc2 rssi out_ifa in_dem outp outn mix3 21 9 3 2 31 1 vee_lnac 5 vee_mix 32 vcc_lna 30 vee_lna in_mix1 4 vcc_mix 8 13 15 16 lo1 lo2 ro lf 26 vco1 cp div_16 div_2 ro pfd 29 24 23 vcc_pll 27 bias 28 enrx 17 vcc_bias 22 vee_bias 25 vee_ro 14 if2 out_mix2 in_ifa 11 vee_if 10 fbc1 12 oap oan 19 20 18 out_oa oa if1 if1p if1n 7 6 mix2
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 4 of 20 nov. 2001 3901071112 rev. 005 frequency planning frequency planning is straightforward for single-conversion applications because there is only one if that might be chosen, and then the only possible choice is low-side or high-side injection of the lo1 signal (which is now the one and only lo signal in the receiver). the receiver?s double-conversion architecture requires careful frequency planning. besides the desired rf input signal, there are a number of spurious signals that may cause an undesired response at the output. among them are the image of the rf signal (that must be suppressed by the rf front-end filter), spurious signals injected to the first if (if1) and their images which could be mixed down to the same second if (if2) as the desired rf signal (they must be suppressed by the lc filter at if1 and/or by low-crosstalk design). by configuring the TH71112 for double conversion and using its internal pll synthesizer with fixed feedback divider ratios of n1 = 16 (div_16) and n2 = 2 (div_2), four types of down-conversion 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 frequency (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 the following table depicts generated, desired, possible images and some undesired signals considering the examples of 868.3 mhz and 915 mhz rf reception at if2 = 10.7 mhz. 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 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 915 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. the columns in bold depict the selected frequency plans to receive at 868.3 mhz and 915 mhz, respectively.
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 5 of 20 nov. 2001 3901071112 rev. 005 pin definition and description pin no. name i/o type functional schematic description 3 out_lna analog output lna open-collector output, to be connected to external lc tank that resonates at rf 31 in_lna analog input lna input, approx. 26 ? single-ended 1 vee_lnac ground out_lna 3 5k vee_lnac 1 in_lna 31 ground of lna core (cascode) 2 gain_lna analog input gain_lna 2 400 ? lna gain control (cmos input with hysteresis) 4 in_mix1 analog input in_mix1 4 500a 13 ? 13 ? mix1 input, approx. 33 ? single-ended 5 vee_mix ground lna biasing ground 6 if1p analog i/o open-collector output, to be connected to external lc tank that resonates at first if 7 if1n analog i/o 20p 20p 2x500a if1p 6 vee vcc vee if1n 7 open-collector output, to be connected to external lc tank that resonates at first if 8 vcc_mix supply mix1 and mix2 positive supply 9 out_mix2 analog output 130 ? 6.8k out_mix2 9 230a mix2 output, approx. 330 ? output impedance 10 vee_if ground ground for mix2, ifa and demod
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 6 of 20 nov. 2001 3901071112 rev. 005 pin no. name i/o type functional schematic description 11 in_ifa analog input ifa input, approx. 2.2k ? input impedance 12 fbc1 analog i/o to be connected to external ifa feedback capacitor 13 fbc2 analog i/o 2.2k 2.2k 200a in_ifa 11 vee vee vcc vee vcc 12 fbc1 fbc2 13 vee vcc to be connected to external ifa feedback capacitor 14 vcc_if supply positive supply for ifa, demod 15 out_ifa analog i/o out_ifa 15 40a ifa output and mix3 input (of demod) 16 in_dem analog input in_dem 16 47k demod input, to mix3 core 17 vcc_bias supply positive supply of general bias system and oa 18 out_oa analog output out_oa 18 50 ? oa output, 40ua current drive capability 19 oan analog input negative oa input, input voltage limited to approx. 0.7 v pp between pins oap and oan 20 oap analog input 20a 19 oan 50 ? 20 oap 50 ? negative oa input, input voltage limited to approx. 0.7 v pp between pins oap and oan
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 7 of 20 nov. 2001 3901071112 rev. 005 pin no. name i/o type functional schematic description 21 rssi analog output i (pi) rssi 21 50 ? 36k rssi output, for rssi and ask detection, approx. 36k ? output impedance 22 vee_bias ground ground for general bias system and oa 23 outp analog output fsk/fm positive output, output impedance of 100k ? to 300k ? 24 outn analog outp outn 23 24 50 ? 20a 20a fsk/fm negative output, output impedance of 100k ? to 300k ? 25 vee_ro ground ground of dividers, pfd and ro 26 ro analog input ro 26 30p 30p 50k ro input, colpitts type oscillator with internal feed- back capacitors 27 vcc_pll supply positive supply of ro, div, pfd and charge pump 28 enrx digital input enrx 28 1.5k mode control input (cmos input) 29 lf analog output lf 29 200 ? 400 ? 4p charge pump output and vco1 control input 30 vee_lna ground lna biasing ground 32 vcc_lna supply positive supply of lna biasing
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 8 of 20 nov. 2001 3901071112 rev. 005 technical data mode configurations enrx mode description 0 sby standby mode 1 on entire chip active note: enrx are pulled down internally lna gain control v gain_lna mode description < 0.8 v high gain lna set to high gain by voltage at gain_lna > 1.4 v low gain lna set to low gain by voltage at gain_lna note: hysteresis between gain modes to ensure stability absolute maximum ratings parameter symbol condition / note min max unit supply voltage v cc 0 7.0 v input voltage v in - 0.3 v cc +0.3 v input rf level p imax no damage 10 dbm storage temperature t stg -40 +125 c human body model, mil std 833d method 3015.7, all pins except out_ifa -500 +500 v electrostatic discharge esd pin out_ifa -500 +250 v normal operating conditions parameter symbol condition min max unit supply voltage v cc 2.5 5.5 v operating temperature t a -40 +85 oc input frequency f i 800 930 mhz frequency deviation ? f at fm or fsk 5 120 khz fsk data rate r fsk nrz 40 kbit/s fm bandwidth f m 15 khz ask data rate r ask nrz 80 kbit/s
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 9 of 20 nov. 2001 3901071112 rev. 005 dc characteristics all parameters under normal operating conditions, unless otherwise stated; typical values at t a = 23 c and v cc = 3 v parameter symbol condition min typ max unit standby current i sby enrx=0 100 na total supply current at low gain i cc, low enrx=1, lna at low gain 6.0 7.5 9.0 ma total supply current at high gain i cc, high enrx=1, lna at high gain 7.5 9.2 11.0 ma opamp input offset voltage v offs -20 20 mv opamp input offset current i offs i oap ? i oan -50 50 na opamp input bias current i bias 0.5 * (i oap + i oan ) -100 100 na rssi voltage at low input level v rssi, low p i = -65 dbm, lna at low gain 0.5 1.0 1.5 v rssi voltage at high input level v rssi, high p i = -35 dbm, lna at low gain 1.25 1.9 2.45 v ac system characteristics all parameters under normal operating conditions, unless otherwise stated; all parameters based on test circuits for fsk (fig. 2), fm (fig. 4) and ask (fig. 5), respectively; typical values at t a = 23 c and v cc = 3 v, rf at 868.3 mhz, second if at 10.7mhz parameter symbol condition min typ max unit start-up time ? fsk/fm t fsk enrx from 0 to 1, valid data at output 0.9 ms start-up time ? ask t ask depends on ask detector time constant, valid data at output r3 ? c12 + t fsk ms input sensitivity ? fsk (narrow band) p min, n b if2 = 40khz ? f = 15khz (fsk/fm) ber 3 ? 10 -3 -109 dbm input sensitivity ? fsk (wide band) p min, w b if2 = 150khz ? f = 50khz (fsk/fm) ber 3 ? 10 -3 -102 dbm input sensitivity ? ask (narrow band) p mina, n b if2 = 40khz ber 3 ? 10 -3 -108 dbm input sensitivity ? ask (wide band) p mina, w b if2 = 150khz ber 3 ? 10 -3 -104 dbm maximum input signal ? fsk/fm p max, fm ber 3 ? 10 -3 lna at low gain 0dbm maximum input signal ? ask p max, ask ber 3 ? 10 -3 lna at low gain -10 dbm spurious emission p spur -70 dbm image rejection ? p imag 65 db blocking immunity ? p block ? f block > 2mhz, note 1 57 db vco gain k vco 250 mhz/v charge pump current i cp 60 a notes: 1. desired signal with fsk/fm or ask modulation, cw blocking signal
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 10 of 20 nov. 2001 3901071112 rev. 005 test circuits fsk reception fig. 2: test circuit for fsk reception c8 lcfil l5 l4 gain_lna out_lna out_mix2 vee fbc1 in_ifa fbc2 vcc out_ifa in_dem vcc out_oa oan oap rssi vee outp outn vcc vcc ro vee vcc vee in_mix1 vee if1n if1p vcc enrx lf vee vcc in_lna lqfp32 c12 cp c13 cerres c11 c7 c6 r1 c3 c1 xtal l3 vcc sawfil c4 l1 l2 c5 c10 c9 cerfil cb* vcc vcc c14 c16 c15
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 11 of 20 nov. 2001 3901071112 rev. 005 fsk test circuit component list to fig. 2 part size value / type tolerance description c1 0805 15 pf 10% crystal series capacitor c3 0805 1 nf 10% loop filter capacitor c4 0603 4.7 pf 5% capacitor to match to saw filter input c5 0603 2.7 pf 5% capacitor to match to saw filter output c6 0603 nip 5% lna output tank capacitor c7 0603 1.2 pf 5% mix1 input matching capacitor c8 0603 22 pf 5% if1 tank capacitor c9 0805 33 nf 10% ifa feedback capacitor c10 0603 1 nf 10% ifa feedback capacitor c11 0603 1 nf 10% ifa feedback capacitor c12 0603 1.5 pf 5% demod phase-shift capacitor c13 0603 680 pf 10% demod coupling capacitor cp 0805 10 - 12 pf 5% cerres parallel capacitor c14 0805 10 ? 47 pf 5% demodulator output low-pass capacitor, depending on data rate c15 0805 10 ? 47 pf 5% demodulator output low-pass capacitor, depending on data rate c16 0603 330 pf 10% rssi output low-pass capacitor r1 0805 10 k ? 10% loop filter resistor l1 0603 12 nh 5% inductor to match saw filter l2 0603 12 nh 5% inductor to match saw filter l3 0603 6.8 nh 5% lna output tank inductor l4 0805 100 nh 5% if1 tank inductor l5 0805 100 nh 5% if1 tank inductor xtal hc49- smd 25.22353 mhz @ rf = 868.3 mhz 25ppm calibra- tion 30ppm temp. fundamental-mode crystal, c load = 10 pf to 15pf, c 0, max = 7 pf, r m, max = 50 ? sawfil qcc8c b3570 @ rf = 868.3 mhz b 3db = 1.7 mhz low-loss saw filter from epcos leaded type sfe10.7mfp @ b if2 = 40 khz tbd cerfil smd type sfecv10.7mjs-a @ b if2 = 150 khz 40 khz ceramic filter from murata cerres smd type cdacv10.7mg18-a ceramic demodulator tank from murata nip ? not in place, may be used optionally
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 12 of 20 nov. 2001 3901071112 rev. 005 fsk circuit with afc and ceramic resonator tolerance compensation fig. 3: test circuit for fsk with afc and resonator compensation circuit feature ! improves input frequency acceptance range up to rf nom 50 khz ! eliminates calibration tolerances of ceramic resonator ! eliminates temperature tolerances of ceramic resonator ! non-inverted and inverted cmos-compatible outputs c8 lcfil l5 l4 gain_lna out_lna out_mix2 vee fbc1 in_ifa fbc2 vcc out_ifa in_dem vcc out_oa oan oap rssi vee outp outn vcc vcc ro vee vcc vee in_mix1 vee if1n if1p vcc enrx lf vee vcc in_lna lqfp32 c12 c13 cerres c11 c7 c6 r1 c3 c1 xtal l3 vcc sawfil c4 l1 l2 c5 c10 c9 cerfil cb* vcc vcc r3 cp vd r4 r5 c14 c16 c15 c18 c17
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 13 of 20 nov. 2001 3901071112 rev. 005 fsk test circuit with afc component list to fig. 3 part size value / type tolerance description c1 0805 15 pf 10% crystal series capacitor c3 0805 1 nf 10% loop filter capacitor c4 0603 4.7 pf 5% capacitor to match to saw filter input c5 0603 2.7 pf 5% capacitor to match to saw filter output c6 0603 nip 5% lna output tank capacitor c7 0603 1.2 pf 5% mix1 input matching capacitor c8 0603 22 pf 5% if1 tank capacitor c9 0805 33 nf 10% ifa feedback capacitor c10 0603 1 nf 10% ifa feedback capacitor c11 0603 1 nf 10% ifa feedback capacitor c12 0603 1.5 pf 5% demod phase-shift capacitor c13 0603 680 pf 10% demod coupling capacitor cp 0805 27 pf 5% ceramic resonator loading capacitor c14 0805 10 ? 47 pf 5% demodulator output low-pass capacitor, depending on data rate c15 0805 10 ? 47 pf 5% demodulator output low-pass capacitor, depending on data rate c16 0603 330 pf 10% rssi output low-pass capacitor c17 33 nf 10% integrator capacitor, fixed 33 nf integrator capacitor, @ 0.5 to 2 kbit/s nrz 10 nf integrator capacitor, @ 2 to 20 kbit/s nrz c18 0805 1 nf 10% integrator capacitor, @ 20 to 40 kbit/s nrz r1 0805 10 k ? 10% loop filter resistor r3 0805 100 k ? 10% varactor diode biasing resistor r4 0805 680 k ? 10% integrator resistor r5 0805 680 k ? 10% integrator resistor l1 0603 12 nh 5% inductor to match saw filter l2 0603 12 nh 5% inductor to match saw filter l3 0603 6.8 nh 5% lna output tank inductor l4 0805 100 nh 5% if1 tank inductor l5 0805 100 nh 5% if1 tank inductor vd sod-323 bb535 varactor diode from infineon xtal hc49- smd 25.22353 mhz @ rf = 868.3 mhz 25ppm calibra- tion 30ppm temp. fundamental-mode crystal, c load = 10 pf to 15pf, c 0, max = 7 pf, r m, max = 50 ? sawfil qcc8c b3570 @ rf = 868.3 mhz b 3db = 1.7 mhz low-loss saw filter from epcos leaded type sfe10.7mfp @ b if2 = 40 khz tbd cerfil smd type sfecv10.7mjs-a @ b if2 = 150 khz 40 khz ceramic filter from murata cerres smd type cdacv10.7mg18-a ceramic demodulator tank from murata nip ? not in place, may be used optionally
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 14 of 20 nov. 2001 3901071112 rev. 005 fm reception fig. 4: test circuit for fm reception vcc r3 r4 r5 r6 c14 c16 c15 gain_lna out_lna out_mix2 vee fbc1 in_ifa fbc2 vcc out_ifa in_dem vcc out_oa oan oap rssi vee outp outn vcc vcc ro vee vcc vee in_mix1 vee if1n if1p vcc enrx lf vee vcc in_lna lqfp32 c12 cp c13 cerres c7 c6 r1 c3 c1 xtal l3 vcc sawfil c4 l1 l2 c5 c11 c10 c9 cerfil c8 lcfil l5 l4 cb* vcc
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 15 of 20 nov. 2001 3901071112 rev. 005 fm test circuit component list to fig. 4 part size value / type tolerance description c1 0805 15 pf 10% crystal series capacitor c3 0805 1 nf 10% loop filter capacitor c4 0603 4.7 pf 5% capacitor to match to saw filter input c5 0603 2.7 pf 5% capacitor to match to saw filter output c6 0603 nip 5% lna output tank capacitor c7 0603 1.2 pf 5% mix1 input matching capacitor c8 0603 22 pf 5% if1 tank capacitor c9 0805 33 nf 10% ifa feedback capacitor c10 0603 1 nf 10% ifa feedback capacitor c11 0603 1 nf 10% ifa feedback capacitor c12 0603 1.5 pf 5% demod phase-shift capacitor c13 0603 680 pf 10% demod coupling capacitor cp 0805 10 -12 pf 5% cerres parallel capacitor c14 0805 100 pf 5% sallen-key low-pass filter capacitor, to set cut-off fre- quency c15 0805 100 pf 5% sallen-key low-pass filter capacitor, to set cut-off fre- quency c16 0603 330 pf 10% rssi output low-pass capacitor r1 0805 10 k ? 10% loop filter resistor r3 0805 12 k ? 5% sallen-key filter resistor, to set desired filter characteristic r4 0805 6.8 k ? 5% sallen-key filter resistor, to set desired filter characteristic r5 0805 33 k ? 5% sallen-key filter resistor, to set cut-off frequency r6 0805 33 k ? 5% sallen-key filter resistor, to set cut-off frequency l1 0603 12 nh 5% inductor to match saw filter l2 0603 12 nh 5% inductor to match saw filter l3 0603 6.8 nh 5% lna output tank inductor l4 0603 100 nh 5% if1 tank inductor l5 0603 100 nh 5% if1 tank inductor xtal hc49- smd 25.22353 mhz @ rf = 868.3 mhz 25ppm calibra- tion 30ppm temp. fundamental-mode crystal, c load = 10 pf to 15pf, c 0, max = 7 pf, r m, max = 50 ? sawfil qcc8c b3570 @ rf = 868.3 mhz b 3db = 1.7 mhz low-loss saw filter from epcos leaded type sfe10.7mfp @ b if2 = 40 khz tbd cerfil smd type sfecv10.7mjs-a @ b if2 = 150 khz 40 khz ceramic filter from murata cerres smd type cdacv10.7mg18-a ceramic demodulator tank from murata nip ? not in place, may be used optionally
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 16 of 20 nov. 2001 3901071112 rev. 005 ask reception fig. 5: test circuit for ask reception c12 vcc r3 c13 gain_lna out_lna out_mix2 vee fbc1 in_ifa fbc2 vcc out_ifa in_dem vcc out_oa oan oap rssi vee outp outn vcc vcc ro vee vcc vee in_mix1 vee if1n if1p vcc enrx lf vee vcc in_lna lqfp32 c7 c6 r1 c3 c1 xtal l3 vcc sawfil c4 l1 l2 c5 c11 c10 c9 cerfil c8 lcfil l5 l4 cb* vcc
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 17 of 20 nov. 2001 3901071112 rev. 005 ask test circuit component list to fig. 5 part size value / type tolerance description c1 0805 15 pf 10% crystal series capacitor c3 0805 1 nf 10% loop filter capacitor c4 0603 4.7 pf 5% capacitor to match to saw filter input c5 0603 2.7 pf 5% capacitor to match to saw filter output c6 0603 nip 5% lna output tank capacitor c7 0603 1.2 pf 5% mix1 input matching capacitor c8 0805 22 pf 5% if1 tank capacitor c9 0805 33 nf 10% ifa feedback capacitor c10 0603 1 nf 10% ifa feedback capacitor c11 0603 1 nf 10% ifa feedback capacitor c12 0805 1 nf to 10 nf 10% ask data slicer capacitor, depending on data rate c13 0603 330 pf 10% rssi output low-pass capacitor r1 0805 10 k ? 10% loop filter resistor r3 0603 100 k ? 5% ask data slicer resistor, depending on data rate l1 0603 12 nh 5% inductor to match saw filter l2 0603 12 nh 5% inductor to match saw filter l3 0603 6.8 nh 5% lna output tank inductor l4 0603 100 nh 5% if1 tank inductor l5 0603 100 nh 5% if1 tank inductor xtal hc49- smd 25.22353 mhz @ rf = 868.3 mhz 25ppm calibra- tion 30ppm temp. fundamental-mode crystal, c load = 10 pf to 15pf, c 0, max = 7 pf, r m, max = 50 ? sawfil qcc8c b3570 @ rf = 868.3 mhz b 3db = 1.7 mhz low-loss saw filter from epcos leaded type sfe10.7mfp @ b if2 = 40 khz tbd cerfil smd type sfecv10.7mjs-a @ b if2 = 150 khz 40 khz ceramic filter from murata nip ? not in place, may be used optionally
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 18 of 20 nov. 2001 3901071112 rev. 005 package dimensions fig. 6: lqfp32 (low quad flat package) all dimension in mm, coplanarty < 0.1mm e1, d1 a a1 a2 e b l e, d min 0.05 1.35 0.30 0.45 0 7.00 0.8 9.00 max 1.60 0.15 1.45 0.45 0.75 7 all dimension in inch, coplanarty < 0.004? min 0.002 0.053 0.012 0.018 0 0.276 0.031 0.354 max 0.630 0.006 0.057 0.018 0.030 7 a1 a2 a b e 1 32 25 17 24 8 9 16 d d1 e1 e l
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 19 of 20 nov. 2001 3901071112 rev. 005 your notes
TH71112 868/915mhz fsk/fm/ask receiver TH71112 data sheet page 20 of 20 nov. 2001 3901071112 rev. 005 your notes important notice devices sold by melexis are covered by the warranty and patent indemnification provisions appearing in its term of sale. melexi s makes no warranty, ex- press, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the describ ed devices from patent infringe- ment. melexis reserves the right to change specifications and prices at any time and without notice. therefore, prior to design ing this product into a system, it is necessary to check with melexis for current information. this product is intended for use in normal commercial applications. applications requiring ex- tended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life- support or life-sustaining equip- ment are specifically not recommended without additional processing by melexis for each application. the information furnished by melexis is believed to be correct and accurate. however, melexis shall not be liable to recipient or any third party for any dam- ages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or ind irect, special incidental or conse- quential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data he rein. no obligation or liability to recipient or any third party shall arise or flow out of melexis? rendering of technical or other services. ? 2000 melexis gmbh. 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 and japan: all other locations: phone: +32 1361 1631 phone: +1 603 223 2362 e-mail: sales_europe@melexis.com e-mail: sales_usa@melexis.com qs9000, vda6.1 and iso14001 certified

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