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? e95119-te sony reserves the right to change products and specifications without prior notice. this information does not convey any license by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illustrating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits. absolute maximum ratings (ta = 25?) supply voltage v cc 5v operating temperature topr ?5 to +85 ? storage temperature tstg ?5 to +150 ? allowable power dissipation p d 500 mw operating conditions supply voltage v cc 2.7 to 3.6 v description the CXA1742Q is an analog cellular(amps) fm if ic which include an if filter. features include a ceramic filter function, which is normally mounted externally. quadrature detection discriminator function. this ic has almost all if functions and is ideal for reduction in set size because of few external parts required. channel filter conforming to the amps standard. wide operating voltage range (2.7 v to 3.6 v) and low current consumption (icc=10 ma (typ.) when vcc= 3 v). wide range and excellent temperature characteristics for the rssi (receiving signal strength indicator). applications ideally suited for cellular phones, particularly hand- held sets. structure bipolar silicon monolithic ic if amplifier for analog cellular communications 40 pin qfp (plastic) CXA1742Q
? CXA1742Q block diagram and pin configuration (top view) note) pins 21 and 25 are connected via the ic internal wiring. pins 12, 21 and pins 25, 34 are connected via ic internal resistors. when designing a pcb, ensure that all gnd pins of ic are connected to the gnd on pcb with its connection wiring distance minimized. 1 2 3 4 5 6 7 8 9 10 11 19 18 17 16 15 14 13 12 20 31 32 33 34 35 36 37 38 39 40 23 22 21 24 25 26 27 30 28 29 xtalin xtalout agcps vref rssips t2 rsdetps t1 gnd2 v cc 2 t3 mixadj2 mixps gnd v cc ifps ifin gnd mixin mixadj1 t4 t5 v cc 1 gnd1 t6 fadj1 sgnd bpfps1 fadj2 bpfps2 bias lim det rssi agc bpf1 bpf0 1/ 2 osc psn psn rf amp mixer sw nc bpfo audio rssi gadj(rssi) if2 limps limin
? CXA1742Q 1sw 2nc 3 bpfo 1.83v 4 limin open 5 base 6 audio 1.85v 50k gnd 31 34 1 vref 50k 20a 11 12 1k 6 33 34 147 3 b.p.f n.f.b network used at the gnd potential. not intemally connected. bpf output. connect to pins 4,5. input of bpf output. the dc bias is applied from pin3 when the output of bpf is connected to them. outputs an audio signal which is fm-detected. pin no. symbol pin voltage i/o equivalent circuit description dc ac resistance lim rssi 4 5 147
? CXA1742Q 7 rssi 1.1 v 8 gadj 0.2 v 9 if2 1.07 v 10 limps 1.82 v 11 12 147 7 11 12 10 rssi output. outputs a dc voltage in accordance with the signal input to the rf amplifier. adjusts the rssi amplifier gain. limiter operation monitor. not used normally. connects a limiter integrating capacitor. pin no. symbol pin voltage i/o equivalent circuit description dc ac resistance 147 7 8 147 147 11 12 9
? CXA1742Q 11 v cc 2 3.0 v 12 gnd2 0 v 13 t1 14 rsdetps 1.35 v 15 t2 16 rssips 1.83 v 17 vref 1.25 v 33 34 17 reference voltage used in the internal circuit power supply. supplies current to the lim, det, and rssi circuits. ground. ic operation check. connects an rssi detector integrating capacitor. ic operation check. connects an rssi integrating capacitor. monitor for the reference voltage used in the internal circuit. when connected to an external capacitor, this pin also functions to lower the reference voltage dynamic impedance. pin no. symbol pin voltage i/o equivalent circuit description dc ac resistance 11 12 147 14 11 12 16
? CXA1742Q 18 agcps 0.233 v 19 xtalout 20 xtalin 2.96 v 21 gnd 0 v 22 ifin 1.25 v 23 ifps 1.25 v 24 v cc 3.0 v 25 gnd 0 v connects an agc integrating capacitor. connect a crystal oscillator to form a colpitts-type oscillator circuit. when an external oscillator is used, its signal must be connected to pin 20. ground. rf amplifier input. the relationship between ifin (pin 22) and ifps (pin 23) is designed so that the ic internal stray capacitance is small. therefore, if pins 22 and 23 are used for balance input, the common-mode rejection deteriorates. power supply. supplies current to the rf amp, mixer, osc, and 1/2 divider circuits. ground. pin no. symbol pin voltage i/o equivalent circuit description dc ac resistance 24 21 10k 19 15p 25 20 147 10k 33 15 34 vref 18 24 25 21 vref 23 22 1.5k 1.5k
? CXA1742Q 26 mixin 1.3 v 27 mixps 1.3 v 28 mix adj2 0.143 v 29 mix adj1 0.143 v 30 t3 31 t4 32 t5 33 v cc 1 3.0 v 34 gnd1 0 v 35 t6 36 fadj1 2.29 v 37 fadj2 1.55 v rf amp output monitor. connected to the mixer input in the ic. balance adjustment for mixers 1 and 2. ic operational check. power supply. supplies current to the psn, bpf, and bias circuits. ground. ic operational check. when the resistance value of an external resistor connected between pins 36 and 37 is varied, the center frequency of the bpf in the ic changes accordingly. pin no. symbol pin voltage i/o equivalent circuit description dc ac resistance 660 28 29 4k 4k 4k 4k 660 mixer 27 26 rf amp 37 36 147 147
? CXA1742Q 38 sgnd 1.83 v 39 bpfps1 1.17 v 40 bpfps2 1.2 v monitor for the pseud- ground voltage used in the internal circuits. when connected to an external capacitor, this pin also functions to lower the reference voltage dynamic impedance. monitor for the reference voltage used by the bpf. when connected to an external capacitor, these pins also function to lower the reference voltage dynamic impedance. pin no. symbol pin voltage i/o equivalent circuit description dc ac resistance 33 34 39 40 reference voltage used for b.p.f 33 34 38 b.p.f signal reference voltage
? CXA1742Q item symbol conditions min. typ. max. unit current consumption - 1 current consumption - 2 current consumption - 3 pin current pin 1 - low pin current pin 1 - high pin current pin 19 pin voltage - pin 17 pin voltage - pin 38 pin voltage - pin 39 pin voltage - pin 40 osc output swing pin 19 bpf output voltage - 1 bpf output voltage - 2 if1 output voltage mixer image rejection level bpf 6 db bandwidth bpf 40 db bandwidth bpf extraband attenuation fm detection level am rejection ratio i cc-11 i cc-24 i cc-33 i il i ih i 19 v 17 v 38 v 39 v 40 v osc v tg1 v tg2 v tif v imag bw 6db bw 40db att 40k fm det amr fin = 45 mhz, ?0 dbm pin 11 fin = 45 mhz, ?0 dbm pin 24 fin = 45 mhz, ?0 dbm pin 33 0 v 3 v crystal osc. 89.88 mhz crystal osc. 89.88 mhz fin = 45 mhz, ?0 dbm fin = 45 mhz, ?0 dbm fin = 45 mhz, ?0 dbm fin = 44.88 mhz, ?0 dbm vin = ?0 dbm, swept with fin = 45 mhz regarded as the center vin = ?0 dbm, swept with fin = 45 mhz regarded as the center fo ?0 khz fin = 45 mhz, 30 dbm, fmod=1 khz, dev. = 8 khz, used lpf 20 khz fin = 45 mhz, ?0 dbm, fmod = 1 khz, mod = 80% used lpf 20 khz 0.8 1.1 1.5 ma 2 2.8 3.7 ma 3.6 5.1 6.7 ma ?4 ?0 ? ? 15 22 30 ? 0.4 0.6 ma 1.2 1.25 1.3 v 1.7 1.83 1.95 v 1.05 1.17 1.3 v 1.07 1.2 1.33 v 70 93 130 mv rms 90 152 220 mv rms 200 260 mv rms 70 100 130 mv rms 30 100 mv rms 29 32 35 khz 47 khz 56 db 130 166 200 mv rms 23 30 db electrical characteristics 0dbm = 50 , 1mw v cc = 3v, ta = 25? f osc = 89.88 mhz amps mode (pin 1=low)
?0 CXA1742Q item symbol conditions min. typ. max. unit audio output distortion rssi output voltage - 11 rssi output voltage - 12 rssi output voltage - 13 equivalent input resistance pin 22 equivalent input capacitance pin 22 bpf?o temperature characteristics amps mode thd rssi 11 rssi 12 rssi 13 r in c in fin = 45 mhz, ?0 dbm, fmod = 1 khz, dev. = 8 khz, used lpf 20 khz no input fin = 45 mhz, ?0 dbm fin = 45 mhz, ?0 dbm f = 45 mhz f = 45 mhz ta = ?0 to + 70? 3.2 5.5 % 1 1.1 1.25 v 1.65 1.88 2.1 v 2.4 2.62 2.8 v 1.4 k 4.7 pf 1.5 khz others
?1 CXA1742Q measurement circuit 56k vr10k 104 104 104 23 1 2 3 4 5 6 7 8 9 10 11 19 18 17 16 15 14 13 12 20 22 21 24 25 26 27 30 31 32 33 34 35 36 37 38 39 40 28 29 bias lim det rssi agc bpf1 bpf0 1/2 osc psn psn rf amp mixer vcc 3v 7 104 47 100 10 s6 s5 103 101 104 6 10p 102 6p 89.88mhz 0.47 102 104 223 s4 104 s3 1k 104 103 s2 1k 47k 102 220k s1 104 1234 5 500 1.5
?2 CXA1742Q application circuit application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. note) use a 0.1? capacitor for pin 14 decoupling. the ic malfunctions at a capacitance of 0.047? or lower. the oscillator circuit must be changed according to the crystal characteristics. when designing pcb pattern, make pcb pattern so that pins 3, 4, and 5 are connected correlatively. 23 1 2 3 4 5 6 7 8 9 10 11 19 18 17 16 15 14 13 12 20 22 21 24 25 26 27 30 31 32 33 34 35 36 37 38 39 40 28 29 bias lim det rssi agc bpf1 bpf0 1/2 osc psn psn rf amp mixer 10p 89.88mhz 0.47 6p audio out rssi out 82p 47k 220k 94k 0.1 0.1 vcc 0.1 0.1 0.1 0.1 100p 45mhz in vcc 0.1 0.1 1.5 0.1 vcc 20k 51k 2.2 2.2 2.2 vcc oscillator circuit
?3 CXA1742Q description of operation a 45 mhz if signal is input to pin 22. this input signal is amplified at the rf amp and then mixed with the local oscillation signals from the oscillator at the mixer to change the signal frequency to 60 khz. when a crystal or the other resonator circuit is connected to pins 19 and 20, the oscillator can be self-executed by composing a colpitts-type oscillation circuit. it can be also used with an external local oscillation signal applied to pin 20. the internal bpf eliminates any interference from the converted 60 khz signal, which is then output to pin 3. the resulting signal is fed to pins 4 and 5 to connect to the limiter and rssi circuits. the limiter eliminates an amplitude component from the signal. the resulting signal is then detected at the quadrature fm detector circuit, and pin 6 outputs an audio signal. the rssi circuit detects the rf amp input signal voltage and generates from pin 7 the dc voltage where the detected voltage value is logarithmically compressed. the resulting signal is fed to pins 4 and 5 to connect to the limiter and rssi circuits. xtalin 23 1 2 3 4 5 6 7 8 9 10 11 19 18 17 16 15 14 13 12 20 22 21 24 25 26 27 30 31 32 33 34 35 36 37 38 39 40 28 29 bias lim det rssi agc bpf1 bpf0 1/2 osc psn psn rf amp mixer xtalout ifin 45mhz in rssi out audio out signal flow audio output rssi output crystal oscillator circuit
?4 CXA1742Q 1) power supply power supply pins (pins 11, 24, and 33) must be decoupled with the shortest distance. 2) oscillator the figures below show how to use the CXA1742Q oscillator. 19 20 v cc v cc 102 sg c l 19 20 v cc crystal c 2 c 1 l v cc (a) inputting a local oscillation signal from an external circuit. the circuit current varies with the externally fed signal amplitude. the reason is that the agc circuit, which works to maintain the oscillation amplitude constant when a colpitts-type oscillator circuit is formed, also operates when an external local oscillation signal is input. tune the l and c to the pin 20 input signal frequency or the needed frequency. the tuning point is decided at the minimum of the pin 19 current. do not decide the point when the probe is connected to pin 19 because the tuned frequency is deviated by the stray capacitor of the probe. (b) configuring a colpitts-type oscillator circuit. the c1, c2, and l must be changed according to the crystal characteristics. the oscillation tr in the ic is internally subjected to agc so that the oscillation level at pin 19 is not likely to be affected by temperature or supply voltage fluctuations. 3) mixers since the bpf in the ic has an fo value as low as 60 khz, the ic employs an image rejection type of mixer having an enhanced interference elimination capability. therefore, the two internal mixers must be accurately adjusted so that their gains are equal. normally, an adequate degree of image rejection is provided without using pins 28 and 29. however, when they are used for adjustment purposes, an increased degree of image rejection will result. 28 29 500 w
?5 CXA1742Q 4) bpf the passband frequency of the built-in filter should be adjusted. for adjustment method, adjust skirt characteristics of band-pass filter to be symmetric with respect to the center frequency. or observe the audio output at pin 7 and adjust the variable resistor between pins 36 and 37 so as to minimize the audio output distortion. 5) rssi (receiving signal strength indicator) rssi detects the input signal level. the ic generates a dc voltage output, which is nearly proportional to the logarithmic value of rf input level. the output level can be varied by adjusting gadj (pin 8) resistance value. adjust the resistance value so that saturation does not occur when the input level is high. 37 36 v 0 dbm input level v cc (approx. 0.5v) adjust for this curve. rssi 7 8 rssi
?6 CXA1742Q notes on operation 1. this ic must be handled with care because it is extremely susceptible to electrostatic surges. particularly, ifin (pin 22) is easily damaged by electrostatic surges. 2. when the 0.1? capacitor connected to pin 14 has a capacitance of 0.047? or less, the ic malfunctions. be sure that the employed capacitor has an excellent temperature characteristics. 3. when the capacitance value of the 0.1? capacitor connected to pin 38 is decreased, the ic characteristics begin to slightly deteriorate. further, a capacitance value increase would not improve the ic characteristics accordingly. 4. when the capacitance value of the 0.1? capacitor connected to pin 40 is decreased, the ic characteristics slightly deteriorate. 5. vcc1 (pin 33) supplies the power to the reference bias voltage generator circuit which is necessary for ic operations. if the same v cc power supply is not provided for vcc voltages to be applied to pins 11, 19, 24, and 33, ensure that the pin 33 vcc rises first. 6. be sure that nothing is connected to pins 13, 15, 30, 31, 32, and 35. 7. resistance between pins 36 and 37 the signal of 45 mhz, ?0 dbm is input from pin 22 (ifin) and the level of pin 3 (bpfout) is read. after that when this frequency is varied to +18 khz and ?8 khz respectively, resistance value between pins 36 and 37 is varied to be the same attenuation level. 8. inductance between pins 26 and 27 adjustment must be made so that a 45 mhz parallel resonance circuit is formed by the inductor between pins 26 and 27 and the ic stray capacitor. this adjustment assures that an increased mixer conversion gain is provided at a low input signal level. once the optimum value is obtained upon pcb conductive pattern determination, readjustment is unnecessary after sample changes. 9. pin 19 resonance circuit tune this circuit to the crystal oscillation frequency for normal use, tune to the external sg signal frequency when a signal is input from the external sg. once the optimum value is obtained upon pcb conductive pattern determination, readjustment is unnecessary after sample changes.
?7 CXA1742Q example of representative characteristics the following characteristic curves are measured after ic adjustment. if the ic is not properly adjusted, the resulting characteristics are not close to the representative characteristics presented below. when making measurements, observe precautions 7, 8, and 9 under "notes on operation". s 40 35 30 25 20 15 10 5 0 ?20 ?00 ?0 ?0 ?0 ?0 (db) sinad input level (dbm) aa aa aa aa aa aa aa aaa aa aaa aaa aa aa aa aa aa aaaa aaaa aa (db) 0 ?0 ?0 ?0 ?0 ?0 ?0 response ?40 ?20 ?00 ?0 ?0 ?0 ?0 0 (dbm) d n input level CXA1742Q.sinad amps CXA1742Q. amps f=45mhz dev. 8khz audio 1khz cmessage weighting ta=25? v cc =3v f=45mhz dev. 8khz audio 1khz cmessage weighting ta=25? v cc =3v 70 60 50 40 30 20 10 0 ?0 (db) ?0 ?0 ?0 ?0 0 20 40 60 80 (khz) 80 70 60 50 40 30 20 ?0 ?0 ?0 0 20 40 60 80 (khz) (db) v cc =3 v ta=25? d/u d/u 45mhz d f 44.88mhz d f selectivity characteristics image rejection characteristics v cc =3v ta=25? 12db sinad=?6.1dbm (%) 7 6 5 4 3 2 ?5 ?0 ? 0 5 10 15 v cc =2.7v ta=25? distortion 5 4 3 2 1 0 0246810121416 (%) v cc =2.7v ta=25? (khz) distortion deviation 45mhz d f (khz) detuning characteristics modulation characteristics
?8 CXA1742Q band-pass filter characteristics the response characteristics of the band-pass filter (total value of bpf0 and bpf1) are shown below. supply voltage vcc = 3 v, operating temperature ta = 25? 0 ?00 ?0 ?0 ?0 ?0 0 ?0 ?0 ?0 ?0 agc operating range if input bpf output (dbm) (dbv) v cc =3 v in put:pin 22 f=45mhz measurement:pin 3 i/o characteristics 70c 25c ?0c (db) 0 ?0 ?0 ?0 ?0 20 40 60 80 100 (khz) gain g.delay 125 0 (s) (db) 10 0 ?0 ?0 ?0 ?0 40 50 60 70 80 250 125 0 (s) (khz) gain g.delay frequency frequency bpf characteristics-1 bpf characteristics-2 (v) 3 2.5 2 1.5 1 0.5 ?00 ?0 0 input voltage (dbm) rssi vo lt age v cc =3 v rssi characteristics 75c 25c ?0c (db) 0 ? ? ?2 ?6 01020 (khz) responce frequency audio output frequency characteristics v cc =3v, ta=25? input f=45mhz, ?0dbm dev=8khz
sony code eiaj code jedec code package material lead treatment lead material package weight epoxy resin solder / palladium copper / 42 alloy package structure plating 0.2g qfp-40p-l01 * qfp040-p-0707 40pin qfp (plastic) 9.0 0.4 + 0.4 0.3 ?0.1 0.65 1 10 11 20 21 30 31 40 1.5 ?0.15 + 0.35 0.127 ?0.05 + 0.1 (8.0) a a detail 0.1 ?0.1 + 0.15 + 0.15 7.0 ?0.1 0.5 0.2 0.1 m 0.12 package outline unit : mm CXA1742Q ?9

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