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? e94245-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 CXA1741Q is an analog cellular(tacs/ ntacs) fm if ic which incorporates an if filter. features incorporates 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. the built-in filter permits mode changeover between tacs and ntacs. 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) CXA1741Q
? CXA1741Q block diagram and pin configuration (top view) 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 sw(tacs/ntacs) nc bpfo audio rssi gadj(rssi) if2 limps bias lim det rssi agc bpf1 bpf0 1/2 osc psn psn rf amp mixer 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.
? CXA1741Q 1sw0v tacs open ntacs high (3 v) 2nc 3 bpfo 1.8 v 4 5 6 audio 2.1 v 50k gnd 31 34 1 vref 50k 20a 11 12 1k 6 33 34 4 147 3 5 b.p.f n.f.b network lim rssi changeover switch for built-in filter. tacs for low; ntacs for high. not internally connected. bpf output monitor. not used normally. connected to the lim and rssi inputs in the ic. outputs an audio signal which is fm-detected. pin no. symbol pin voltage i/o equivalent circuit description dc ac resistance ( )
? CXA1741Q 7 rssi 1.2 v 8 gadj 0.2 v 9 if2 0.9 v 10 limps 1.8 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 (varies the resistance so as to obtain a linear rssi output). limiter operation monitor. not used normally. connects a limiter integrating capacitor. pin no. symbol pin voltage i/o equivalent circuit description dc ac resistance 8 7 147 147 147 11 12 9
? CXA1741Q 11 v cc 2 3.0 v 12 gnd2 0 v 13 t1 14 rsdetps 1.4 v 15 t2 16 rssips 1.8 v 17 vref 1.3 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
? CXA1741Q 18 agcps 0.2 v 19 xtalout 2.9 v 20 xtalin 2.9 v 21 gnd 0 v 22 ifin 1.3 v 23 ifps 1.3 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 input 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
? CXA1741Q 26 mixin 1.3 v 27 mixps 1.3 v 28 mix adj2 0.1 v 29 mix adj1 0.1 v 30 t3 31 t4 32 t5 33 v cc 1 3.0 v 34 gnd1 0 v 35 t6 36 fadj1 2.2 v 37 fadj2 1.5 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
? CXA1741Q 38 sgnd 1.8 v 39 bpfps1 1.1 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
? CXA1741Q 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, -30 dbm pin 11 fin = 45 mhz, -30 dbm pin 24 fin = 45 mhz, -30 dbm pin 33 0 v 3 v crystal osc. 89.9 mhz crystal osc. 89.9 mhz fin = 45 mhz, -50 dbm fin = 45 mhz, -20 dbm fin = 45 mhz, -20 dbm fin = 44.9 mhz, -30 dbm vin = -50 dbm, swept with fin = 45 mhz regarded as the center vin = -50 dbm, swept with fin = 45 mhz regarded as the center fo ?0 khz fin = 45 mhz, -30 dbm, fmod=1 khz, dev. = 5.6 khz, dev. = 5.6 khz, used lpf 20 khz fin = 45 mhz, -30 dbm, fmod = 1 khz, mod = 80% used lpf 20 khz 0.8 1.1 1.5 ma 2 2.9 3.8 ma 3.8 5.3 7 ma -14 -10 -7 ? 15 23 30 ? 0.4 0.6 ma 1.2 1.25 1.3 v 1.6 1.8 2 v 1 1.17 1.4 v 1 1.2 1.4 v 70 93 130 mv rms 100 162 220 mv rms 220 291 360 mv rms 80 89 100 mv rms 30 100 mv rms 26 30 khz 47 khz 56 db 150 194 250 mv rms -27 -20 db electrical characteristics 0dbm = 50 , 1mw v cc = 3v, ta = 25? f osc = 89.9 mhz wide bpf; tacs mode (pin 1=low)
?0 CXA1741Q item symbol conditions min. typ. max. unit audio output distortion rssi output voltage - 11 rssi output voltage - 12 rssi output voltage - 13 mixer 3rd inter-modulation bpf 6 db bandwidth bpf 40 db bandwidth bpf extraband attenuation fm detection level am detection level audio output distortion rssi output voltage - 21 rssi output voltage - 22 rssi output voltage - 23 others equivalent input resistance pin 22 equivalent input capacitance pin 22 bpf?o temperature characteristics tacs mode bpf?o temperature characteristics ntacs mode thd rssi 11 rssi 12 rssi 13 im 3 bw 6db bw 40db att 20k fm ndet amr n thd n rssi 21 rssi 22 rssi 23 r in c in fin = 45 mhz, -30 dbm, fmod = 1 khz, dev. = 8 khz, used lpf 20 khz no input fin = 45 mhz, -60 dbm fin = 45 mhz, -20 dbm f1 = 45.02 mhz, -30 dbm, f2 = 45.04 mhz, -30 dbm vin = -50 dbm, swept with fin = 45 mhz regarded as the center vin = -50 dbm, swept with fin = 45 mhz regarded as the center fo ?0 khz fin = 45 mhz, -30 dbm, fmod = 1 khz, dev. = 3 khz, used lpf 20 khz fin = 45 mhz, -30 dbm, fmod = 1 khz, mod = 80%, used lpf 20 khz fin = 45 mhz, -30 dbm, fmod = 1 khz, dev. = 3 khz, used lpf 20 khz no input f = 45 mhz, -60 dbm f = 45 mhz, -20 dbm f = 55 mhz f = 55 mhz ta = -30 to + 70? ta = -30 to + 70? 3.7 6 % 1 1.15 1.3 v 1.65 1.93 2.2 v 2.4 2.67 2.8 v 4.5 20 mv rms 13.5 16 khz 23 khz 62 db 99 mv rms 16 db 2.8 % 1.09 v 1.91 v 2.65 v 1.4 k 4.7 pf 1.5 khz 1.5 khz narrow bpf; ntacs mode (pin 1=high)
?1 CXA1741Q 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 89.9mhz 0.47 102 104 223 s4 104 s3 1k 104 103 s2 1k 47k 102 220k s1 104 1234 5 500 1.5
?2 CXA1741Q application circuit 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. this makes ic other than tacs/ntacs standard possible to use without changing pcb pattern. 23 1 2 4 3 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 7p 109.9mhz 0.33 10p oscillator circuit tacs ntacs 50k 50k vcc audio out rssi out 82p 47k 220k 94k 0.1 0.1 vcc 0.1 0.1 0.1 0.047 100p 45mhz in vcc 0.1 0.1 1.5 0.1 vcc 20k 51k 2.2 2.2 2.2 vcc 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.
?3 CXA1741Q 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 50 khz. when a crystal resonator or like external 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 50 khz signal, which is then fed to the limiter and rssi circuit. 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. sw (pin 1) can switch the ntacs and tacs modes. 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 crystal oscillator circuit ifin 45mhz in rssi out audio out audio output rssi output vcc tacs ntacs signal flow
?4 CXA1741Q 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 CXA1741Q oscillator. 19 20 vcc vcc 600mvp-p or more 19 20 vcc crystal c 2 c 1 l vcc (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. (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 50 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 CXA1741Q 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 vcc (approx. 0.5v) adjust for this curve. rssi 7 8 rssi
?6 CXA1741Q 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 affected 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 +8 khz and ? 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 this circuit must be adjusted for the crystal oscillation frequency. once the optimum value is obtained upon pcb conductive pattern determination, readjustment is unnecessary after sample changes.
?7 CXA1741Q 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". 55 50 45 60 52 54 56 58 60 62 64 66 68 70 72 total resistance value [k ] bpf?o [khz] sensitivity of adjust r vs fo 45 50 55 60 bpf?o [khz] 19 18 17 20 ntacs?w 20db [khz] pass band shift by the bpf?o adjustment 16 15 14 w
?8 CXA1741Q [db] 40 30 20 10 0 ?20 ?00 ?0 ?0 ?0 ?0 [dbm] tacs ntacs ?0 ?0 ?0 ?0 ?0 ?0 0 s ?20 ?00 ?0 ?0 ?0 ?0 [dbm] d n ?0 ?0 ?0 ?0 ?0 ?0 0 s ?20 ?00 ?0 ?0 ?0 ?0 [dbm] d n [db] [db] input level input level input level response response response cxa1741?tacs ccitt weighting f=45mhz fm modulation dev. 3khz audio 1khz ta=25? v cc =3.3v cxa1741?acs ccitt weighting f=45mhz fm modulation dev. 5.7khz audio 1khz ta=25? v cc =3.3v cxa1741?inad tacs f=45mhz, fm modulation dev. 5.7khz audio 1khz ccitt weighting ntacs f=45mhz, fm modulation dev. 3khz audio 1kh ccitt weighting ta=25? vcc=3.3v
?9 CXA1741Q 50 40 30 20 10 60 70 45mhz d f [khz] ?0 ?0 ?0 ?0 ?0 +10 +20 +30 +40 +50 d/u [db] ntacs tacs selectivity characteristics 0 ?0 ?0 ?0 ?0 50 40 30 20 10 60 70 80 +10 +20 +30 +40 tacs ntacs d/u [db] image rejection characteristics 44.9mhz d f [khz] 0 ? ? ? ? 10 8 6 4 2 12 14 +2 +4 +6 +8 tacs ntacs distortion [%] detuning characteristics 45mhz d f [khz] ?0 +10 tacs deviation 5.7khz audio 1khz ccitt weighting ntacs deviation 3khz audio 1khz ccitt weighting v cc =2.7v ta=25? v cc =2.7v ta=25? 20db sinad=?6dbm v cc =2.7v ta=25?
?0 CXA1741Q 2.5 2.0 1.5 1.0 0.5 0 ?00 ?0 0 tacs v cc =2.7v 3.0 [v] if input voltage rssi characteristics-1 rssi output voltage 70? 25? ?0? dbm signal input from pin 22 (if in) voltage measurement at pin 7 2.5 2.0 1.5 1.0 0.5 0 ?00 ?0 0 ntacs v cc =2.7v 3.0 [v] if input voltage rssi characteristics-2 rssi output voltage 70? 25? ?0? dbm ?0 2 distortion [db] modulation characteristics 4 6 8 10 ?0 ?0 ?0 deviation [khz] ntacs tacs ifin to audio out f=4.5mhz, ?0dbm audio=1khz ccitt weighting v cc =3.3v ta=25? ?00 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 0 ?0 ?0 0 if input [db] ?0 im3 10 audio frequency response 100 1k 10k 100k ?4 ? +2 frequency [hz] ntacs tacs 0db normalized at 1khz tacs deviation 5.7khz ntacs deviation 3khz ifin 45mhz, ?0dbm ta=25?, v cc =3.3v 0 ?2 ?0 ? ? ? i/o characteristics bpf output [dbv] response [db] ifin to bpf out f 0 =45mhz f 1 =45.02mhz f 2 =45.04mhz ta=25? v cc =3.3v
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 CXA1741Q ?1

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