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TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 1 of 20 nov. 2001 3901007111 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 either with phase-coincidence or pll demodulator ! low current consumption in active mode and very low standby current ! switchable lna gain for improved dynamic range ! afc feature allows wide carrier frequency acceptance range ! rssi allows signal strength indication and ask detection ! surface mount package lqfp44 ordering information part no. temperature range package TH7111 -40 c to 85 c lqfp44 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 for double conversion and 3.3 v to 5.5 v for single conversion ! 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
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 2 of 20 nov. 2001 3901007111 rev. 005 general description the TH7111 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 first if (if1) " second mixer (mix2) for down-conversion of the if1 to the second if (if2) " if amplifier (ifa) to amplify and limit the if2 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, ask detection and automatic-frequency control (afc) " bias circuitry for bandgap biasing and circuit shutdown with the TH7111 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 varactor to create an afc circuit). in pll demodulator configuration, the multiplier mix3 forms a phase comparator. in ask configurati- on, the rssi signal is feed to an ask detector, which is constituted by the operational amplifier. the second vco (vco2) can be used either as the vco of a pll demodulator or as the lo2 source of a second exter- nal pll in a multi-channel system. the following table briefly summarizes the various configurations. single-conversion configuration double-conversion configuration fm/fsk narrow-band rx with ceramic demodulation tank narrow-band rx with ceramic demodulation tank fm/fsk wide-band rx with lc demod. tank and afc wide-band rx with lc demod. tank and afc fm/fsk extended sensitivity rx with pll demodulator extended sensitivity rx with pll demodulator fm/fsk multi-channel rx with ceramic demodulation tank and external channel synthesizer ask rx with rssi-based demodulation rx with rssi-based demodulation ask rx with rssi-based demodulation and exter- nal channel synthesizer the preferred 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 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 a lc filter at the lna output. it is also possible to use the TH7111 in single-conversion configuration. this can be achieved by switching the lo2 input of mix2 from the on-chip pll synthesizer to the pin in_mix2 by means of an internal switch (done via pin sw_mix2). now mix2 operates as an amplifier for the if1 signal if an external pull-down re- sistor at pin in_mix2 is added. the same setting of mix2 can be used for multi-channel applications . in this situation in_mix2 must be driven by an external lo2 signal. this signal can be generated by the vco2, which is mainly a bipolar tran- sistor that can be configured as a varactor-tuned vco. furthermore, a second external pll for channel selection via lo2 tuning is required. this may be arranged by using a pll synthesizer chip that can be con- trolled through a 3-wire bus serial interface. the reference signal for the external pll synthesizer can be directly taken from the crystal-based reference oscillator ro.
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 3 of 20 nov. 2001 3901007111 rev. 005 block diagram fig. 1: TH7111 block diagram in_lna lna mix2 mix1 ifa gain_lna out_lna rssi out_ifa in_dem outp outn vco2 vco2_b vco2_e 23 24 mix3 25 vcc_bias 29 vcc_mix2 12 4 3 42 vee_vco1 43 2 vee_lnac 8 vee_mix1 5 vee_lna vcc_lna 41 vee_lna 40 in_mix1 6 cap_mix1 7 vcc_mix1 11 17 19 20 lo2 lo1 ro lf2 sw_mix2 in_mix2 lf1 35 vco1 switch div_16 div_2 ro pfd 39 33 22 21 38 32 31 vee_pll vcc_pll 36 37 1 44 enrx enro vref bias 30 vee_bias 34 vee_ro 18 if2 out_mix2 vee_if in_ifa 15 14 13 fbc1 16 oap oan 27 28 26 out_oa oa if1 if1p if1n 10 9 cp
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 4 of 20 nov. 2001 3901007111 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 TH7111 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.
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 5 of 20 nov. 2001 3901007111 rev. 005 pin definition and description pin no. name i/o type functional schematic description 1 vref analog output vref 1 60k reference voltage output, approx. 1.23v 4 out_lna analog output lna open-collector output, to be connected to external lc tank that resonates at rf 42 in_lna analog input lna input, approx. 26 ? single-ended 2 vee_lnac ground out_lna 4 5k vee_lnac 2 in_lna 42 ground of lna core (cascode) 3 gain_lna analog input gain_lna 3 400 ? lna gain control (cmos input with hysteresis) 5 vee_lna ground lna biasing ground 6 in_mix1 analog input in_mix1 6 500a 13 ? 13 ? mix1 input, approx. 33 ? single-ended 7 cap_mix1 analog i/o cap_mix1 7 330 ? 40a connection for mix1 blocking capacitor 8 vee_mix1 ground mix1 ground 9 if1p analog i/o open-collector output, to be connected to external lc tank that resonates at first if 10 if1n analog i/o 20p 20p 2x500a if1p 9 vee vcc vee if1n 10 open-collector output, to be connected to external lc tank that resonates at first if
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 6 of 20 nov. 2001 3901007111 rev. 005 pin no. name i/o type functional schematic description 11 vcc_mix1 supply mix1 positive supply 12 vcc_mix2 supply mix2 positive supply 13 out_mix2 analog output 130 ? 6.8k out_mix2 13 230a mix2 output, approx. 330 ? output impedance 14 vee_if ground ground of mix2, ifa and demod 15 in_ifa analog input ifa input, approx. 2.2k ? input impedance 16 fbc1 analog i/o to be connected to external ifa feedback capacitor 17 fbc2 analog i/o 2.2k 2.2k 200a in_ifa 15 vee vee vcc vee vcc 16 fbc1 fbc2 17 vee vcc to be connected to external ifa feedback capacitor 18 vcc_if supply positive supply for ifa, demod and vco2 19 out_ifa analog i/o out_ifa 19 40a ifa output and mix3 input (of demod) 20 in_dem analog input in_dem 20 47k demod input, to mix3 core 21 sw_mix2 digital input sw_mix2 21 400 ? input selection for lo2 input port of mix2
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 7 of 20 nov. 2001 3901007111 rev. 005 pin no. name i/o type functional schematic description 22 in_mix2 analog input in_mix2 22 840 ? 20a 840 ? external lo2 input port of mix2, approx. 1k ? single- ended 24 vco2_b analog input vco2 input, base of a bipolar transistor 23 vco2_e analog output 47k vco2_b vco2_e 24 vee vcc vcc 23 vee vcc vco2 output, emitter of a bipolar transistor 25 vcc_bias supply positive supply of general bias system and oa 26 out_oa analog output out_oa 26 50 ? oa output, 40ua current drive capability 27 oan analog input negative oa input, input voltage limited to approx. 0.7 v pp between pins oap and oan 28 oap analog input 20a 27 oan 50 ? 28 oap 50 ? positive oa input, input voltage limited to approx. 0.7 v pp between pins oap and oan 29 rssi analog output i (pi) rssi 29 50 ? 36k rssi output, for rssi and ask detection, approx. 36k ? output impedance 30 vee_bias ground ground for general bias system and oa
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 8 of 20 nov. 2001 3901007111 rev. 005 pin no. name i/o type functional schematic description 31 outp analog output fsk/fm positive output, output impedance of 100k ? to 300k ? 32 outn analog output outp outn 31 32 50 ? 20a 20a fsk/fm negative output, output impedance of 100k ? to 300k ? 33 vee_pll ground ground of dividers and pfd 34 vee_ro ground ro ground 35 ro analog input ro 35 30p 30p 50k ro input, colpitts type oscillator with internal feed- back capacitors 36 vcc_pll supply positive supply of ro, div, pfd and charge pump 37 enrx digital input mode control input (cmos input) 44 enro digital input enrx enro 37 44 1.5k mode control input (cmos input) 38 lf1 analog output lf1 38 200 ? charge pump output 39 lf2 analog input lf2 39 400 ? 4p vco1 control input 40 vee_vco1 ground ground of vco1 and charge pump 41 vee_lna ground ground of lna biasing 43 vcc_lna supply positive supply of lna biasing
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 9 of 20 nov. 2001 3901007111 rev. 005 technical data mode configurations enrx enro mode description 0 0 sby standby mode 0 1 ro only only reference oscillator active 1 0 on entire chip active 1 1 on entire chip active note: enrx and enro are pulled down internally second mixer input in_mix2v sw_mix2 mode external lo2 0 double conversion with external lo2 ext. pull-down res. (15 k ? ) 0 single conversion n/c 1 double conversion with internal lo2 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 for double conv. v cc, dc 2.5 5.5 v supply voltage for single conv. v cc, sc 3.3 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
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 10 of 20 nov. 2001 3901007111 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 868.3mhz, second if at 10.7 mhz parameter symbol condition min typ max unit start-up time ? fast mode fsk/fm t fast enrx from 0 to 1, enro = 1, valid data at output 0.4 ms start-up time ? slow mode fsk/fm t slow enrx from 0 to 1, enro = 0, valid data at output 0.9 ms start-up time ? ask t ask depends on ask de- tector time constant and start-up mode, valid data at output r3 ? c13 + t fast (or t slow ) 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
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 11 of 20 nov. 2001 3901007111 rev. 005 test circuits fsk reception fig. 2: test circuit for fsk reception out_mix2 vee vee vee lf1 enrx lqfp44 vcc ro vee lf2 vee vee vee gain_lna out_lna in_mix1 cap_mix1 fbc1 in_ifa fbc2 vcc vref vcc vcc in_lna out_ifa in_dem sw_mix2 in_mix2 vco2_e vco2_b vcc oan oap rssi vee vee outp outn out_oa if1n if1p enro vcc vcc vcc vcc vcc vcc r1 c3 xtal vcc sawfil c4 l1 l2 c5 c6 l3 c11 c12 c10 l5 l4 c9 lcfil cerfil c8 c15 c17 c16 c7 c1 c13 cp c14 cerres cb* vcc
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 12 of 20 nov. 2001 3901007111 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 330 pf 10% mix1 blocking capacitor c9 0603 22 pf 5% if1 tank capacitor c10 0805 33 nf 10% ifa feedback capacitor c11 0603 1 nf 10% ifa feedback capacitor c12 0603 1 nf 10% ifa feedback capacitor c13 0603 1.5 pf 5% demod phase-shift capacitor c14 0603 680 pf 10% demod coupling capacitor cp 0805 10 ? 12 pf 5% cerres parallel capacitor c15 0805 10 ? 47 pf 5% demodulator output low-pass capacitor, depending on data rate c16 0805 10 ? 47 pf 5% demodulator output low-pass capacitor, depending on data rate c17 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
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 13 of 20 nov. 2001 3901007111 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 out_mix2 vee vee vee lf1 enrx lqfp44 vcc ro vee lf2 vee vee vee gain_lna out_lna in_mix1 cap_mix1 fbc1 in_ifa fbc2 vcc vref vcc vcc in_lna out_ifa in_dem sw_mix2 in_mix2 vco2_e vco2_b vcc oan oap rssi vee vee outp outn out_oa if1n if1p enro vcc vcc vcc vcc vcc r1 c3 xtal vcc sawfil c4 l1 l2 c5 c6 l3 c11 c12 c10 l5 l4 c9 lcfil cerfil c8 vcc r4 r5 r3 c15 c17 c16 c19 c18 c7 c1 c13 c14 cerres cb* vcc cp vd
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 14 of 20 nov. 2001 3901007111 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 330 pf 10% mix1 blocking capacitor c9 0603 22 pf 5% if1 tank capacitor c10 0805 33 nf 10% ifa feedback capacitor c11 0603 1 nf 10% ifa feedback capacitor c12 0603 1 nf 10% ifa feedback capacitor c13 0603 1.5 pf 5% demod phase-shift capacitor c14 0603 680 pf 10% demod coupling capacitor cp 0805 27 pf 5% ceramic resonator loading capacitor c15 0805 10 ? 47 pf 5% demodulator output low-pass capacitor, depending on data rate c16 0805 10 ? 47 pf 5% demodulator output low-pass capacitor, depending on data rate c17 0603 330 pf 10% rssi output low-pass capacitor c18 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 c19 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
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 15 of 20 nov. 2001 3901007111 rev. 005 fm reception fig. 4: test circuit for fm reception out_mix2 vee vee vee lf1 enrx lqfp44 vcc ro vee lf2 vee vee vee gain_lna out_lna in_mix1 cap_mix1 fbc1 in_ifa fbc2 vcc vref vcc vcc in_lna out_ifa in_dem sw_mix2 in_mix2 vco2_e vco2_b vcc oan oap rssi vee vee outp outn out_oa if1n if1p enro vcc vcc vcc vcc vcc r1 c3 xtal vcc sawfil c4 l1 l2 c5 c6 l3 c11 c12 c10 l5 l4 c9 lcfil cerfil c8 c7 c1 c13 cp c14 cerres vcc r3 r4 r5 r6 c15 c17 c16 cb* vcc
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 16 of 20 nov. 2001 3901007111 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 330 pf 10% mix1 blocking capacitor c9 0603 22 pf 5% if1 tank capacitor c10 0805 33 nf 10% ifa feedback capacitor c11 0603 1 nf 10% ifa feedback capacitor c12 0603 1 nf 10% ifa feedback capacitor c13 0603 1.5pf 5% demod phase-shift capacitor c14 0603 680 pf 10% demod coupling capacitor cp 0805 10 ?12 pf 5% cerres parallel capacitor c15 0805 100 pf 5% sallen-key low-pass filter capacitor, to set cut-off fre- quency c16 0805 100 pf 5% sallen-key low-pass filter capacitor, to set cut-off fre- quency c17 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
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 17 of 20 nov. 2001 3901007111 rev. 005 ask reception fig. 5: test circuit for ask reception out_mix2 vee vee vee lf1 enrx lqfp44 vcc ro vee lf2 vee vee vee gain_lna out_lna in_mix1 cap_mix1 fbc1 in_ifa fbc2 vcc vref vcc vcc in_lna out_ifa in_dem sw_mix2 in_mix2 vco2_e vco2_b vcc oan oap rssi vee vee outp outn out_oa if1n if1p enro vcc vcc vcc vcc vcc r1 c3 xtal vcc sawfil c4 l1 l2 c5 c6 l3 c11 c12 c10 l5 l4 c9 lcfil cerfil c8 c7 c1 c13 vcc r3 c14 r4 cb* vcc
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 18 of 20 nov. 2001 3901007111 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 0603 330 pf 10% mix1 blocking capacitor c9 0805 22 pf 5% if1 tank capacitor c10 0805 33 nf 10% ifa feedback capacitor c11 0603 1 nf 10% ifa feedback capacitor c12 0603 1 nf 10% ifa feedback capacitor c13 0805 1 nf to 10 nf 10% ask data slicer capacitor, depending on data rate c14 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
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 19 of 20 nov. 2001 3901007111 rev. 005 package dimensions fig. 6: lqfp44 (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 10.00 0.8 12.00 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 0.394 0.031 0.472 max 0.630 0.006 0.057 0.018 0.030 7 b e a1 a2 a d 1 12 22 23 33 44 34 11 d1 e1 e l
TH7111 868/915mhz fsk/fm/ask receiver TH7111 data sheet page 20 of 20 nov. 2001 3901007111 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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