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1 e96y06a8z sony reserves the right to change products and specifications without prior notice. this information does not convey any licens e by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illustr ating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits. absolute maximum ratings ? supply voltage v cc 7.0 v ? operating temperature topr C20 to +75 c ? storage temperature tstg C65 to +150 c ? allowable power dissipation p d 417 mw operating condition supply voltage v cc 1.1 to 4.0 v description the CXA3179N is a low current consumption fm if amplifier which employs the newest bipolar process. it is suitable for m-ary fsk pagers using afc. features ? low current consumption : 1.1 ma (typ. at v cc =1.4 v) ? low voltage operation : v cc =1.1 to 4.0 v ? small package 24-pin ssop ? second mixer and oscillator ? needless of if decoupling capacitor ? reference power supply for operational amplifier and comparator ? bit rate filter with variable cut-off ? afc current output circuit ? rssi function ? if input, v cc standard ? maximum input frequency : 30 mhz applications ? m-ary fsk pagers ? double conversion pagers structure bipolar silicon monolithic ic block diagram and pin configuration if amplifier for m-ary fsk pagers (afc supported) 24 pin ssop (plastic) CXA3179N osc mix reg lva if_lim afc quad_det rssi filter gnd level comp 20 19 18 17 16 15 14 13 24 23 22 21 1 2 3 4 5 6 7 8 9 12 11 10 osc in osc out mix out v cc if in afc quad c1 c2 c3 fil sw th cont mix in gnd reg out reg cont lva out b.s. audio rssi nrz out afc c. afc off l.c. out
2 CXA3179N pin description pin symbol pin equivalent circuit description no. voltage 1 2 3 4 5 6 7 8 osc in osc out mix out v cc if in th cont afc quad 1.4 v 0.7 v 1.3 v 1.4 v 1.4 v connects the external parts of crystal oscillator circuit. a capacitor and crystal oscillator are connected to these pins and v cc . mixer output. connect a 455 khz ceramic filter between this pin and if in. power supply. if limiter amplifier input. determines the level comparator threshold value. threshold value can be adjusted by inserting the resistor between pin 6 and v cc . normally, short to v cc . afc current output. connects the phase shifter of fm detector circuit. v c c 3 0 0 1 5 k g n d 7 2 1 5 k 2 1 3 v c c g n d 1 . 5 k v c c 1 . 5 k g n d 1 . 5 k 5 2 0 k 2 0 k v c c g n d 6 2 5 k v c c g n d 7 7 2 8 v c c 2 2 k g n d 2 0 p 2 0 k
3 CXA3179N pin symbol pin equivalent circuit description no. voltage 9 10 11 12 13 14 15 19 20 16 c1 c2 c3 fil sw rssi afc off l.c. out nrz out lva out audio 0.2 v 0.1 v 0.2 v connects the capacitor that determines the lpf cut-off. switches the lpf cut-off. cut-off is decreased by setting this pin high. (applied voltage range : C0.5 v to +7.0 v) rssi circuit output. sets off the afc circuit current. the afc current is off by setting pin 18 low and pin 14 high. level comparator, nrz comparator and lva comparator outputs. they are open collectors. (applied voltage range : C0.5 v to +7.0 v) level comparator and nrz comparator inputs. the filter circuit output is connected. 7 2 2 0 k 1 4 0 k g n d 1 2 v c c g n d 1 3 7 k 7 k 7 0 k 7 2 2 0 k 1 0 0 k g n d 1 4 v c c g n d 1 0 1 1 9 3 5 k 5 0 k 7 2 g n d 1 5 1 9 2 0 v c c g n d 1 6 7 2 7 2
4 CXA3179N pin symbol pin equivalent circuit description no. voltage 17 18 21 22 23 24 b.s. afc c. reg cont reg out gnd mix in 1.0 v 1.4 v controls the battery saving. setting this pin low suspends the operation of ic. (applied voltage range : C0.5 v to +7.0 v) controls the time constant of the afc circuit. set this pin high to make the short time constant. (applied voltage range : C0.5 v to +7.0 v) output for internal constant-voltage source amplifier. connect the base of pnp transistor. (current capacity : 100 a) constant-voltage source output. controlled to maintain 1.0 v. ground mixer input. 2 0 k 1 0 0 k g n d 1 8 7 2 2 0 k 1 4 0 k g n d 1 7 2 1 v c c g n d 7 2 v c c g n d 7 8 k 1 k 2 2 k 2 2 v c c g n d 2 k 4 . 1 6 k 4 . 1 6 k 2 4
5 CXA3179N item current consumption current consumption am rejection ratio nrz output saturation voltage nrz output leak current nrz hysteresis width vb output current vb output saturation voltage reg out voltage lva operating voltage lva output leak current lva output saturation voltage detector output voltage logic input voltage high level logic input voltage low level limiting sensitivity detector output level ratio deviation to level comparator window width level comparator output saturation voltage level comparator output leak current rssi output offset mixer input resistance mixer output resistance if limiter input resistance electrical characteristics (v cc =1.4 v, ta=25 c, f s =21.7 mhz, f mod =1.6 khz, f dev =4.8 khz, am mod =30 %) symbol i cc i ccs amrr v satnrz i lnrz v twnrz i out v satvb v reg v lva i llva v satlva v odet v thbsv v tlbsv v in (lim) v lcwr v satlc i llc v orssi r inlim r outmix r inlim conditions measurement circuit 1, v2=1.0 v measurement circuit 1, v2=0 v measurement circuit 2, 30 k lpf measurement circuit 4, vin=0.3 v measurement circuit 3, vin=0.1 v measurement circuit 3, vin=0.1 to 0.3 v measurement circuit 5 measurement circuit 5 output current 0 a measurement circuit 6, v1=1.4 to 1.0 v measurement circuit 6, v1=1.0 v measurement circuit 7 measurement circuit 2 measurement circuit 2, data filter fc=2.4 khz when pin 6 is shorted to v cc measurement circuit 9 measurement circuit 8 measurement circuit 10 typ. 1.1 6 10 1.00 1.05 63 C108 0 150 2.0 1.5 1.5 max. 1.35 10 0.4 5.0 20 0.4 1.05 1.10 2.0 0.4 80 0.35 +15 0.4 2.0 300 2.4 1.8 1.8 unit ma a db v a mv a v v v a v mvrms v v dbm % v a mv k k k min. 0.7 25 0 100 0.95 1.00 50 0.9 C15 1.6 1.2 1.2
6 CXA3179N electrical characteristics measurement circuit measurement circuit 2 measurement circuit 4 measurement circuit 6 measurement circuit 1 measurement circuit 3 measurement circuit 5 v c c v 1 1 . 4 v 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 a v 2 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1 v c c v 1 1 . 4 v v 2 1 v v 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 a 1 0 0 k 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1 v i n v c c v 1 1 . 4 v v 2 1 v g n d v 3 0 . 5 v g n d v 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 1 0 0 a 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1 2 2 p 1 5 p 1 8 . 2 k 1 2 0 0 p 1 2 0 0 p 1 2 0 0 p v c c v 1 1 . 4 v 1 0 0 0 p 1 0 p t o 1 2 0 p v i n 1 . 8 v 2 1 v v 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1 v c c v 1 1 . 4 v v 2 1 v v 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 5 0 a 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1 v i n v c c v 2 1 v v 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 a 1 0 0 k 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1 v 1 1 . 4 t o 1 . 0 v
7 CXA3179N measurement circuit 8 measurement circuit 10 measurement circuit 7 measurement circuit 9 v c c v 1 1 . 4 v v 2 1 v v 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 5 0 a 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1 v c c v 1 1 . 4 v v 2 1 v v 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 5 0 a 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1 v i n 0 . 1 v v c c v 1 1 . 4 v v 2 1 v v 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 a 1 0 0 k 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1 v i n 0 . 2 v v c c v 2 1 v v 1 1 . 4 v v 1 0 0 p 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 1 2 3 4 5 6 7 8 9 1 0 1 2 1 1
8 CXA3179N application circuit g n d o s c m i x r e g l v a i f _ l i m a f c q u a d _ d e t r s s i f i l t e r g n d r f s m a 1 0 p t o 1 2 0 p 1 . 8 h g n d 1 0 0 0 p g n d 1 0 p n p p 7 r e g s 4 1 0 0 k p 6 l v a g n d s 3 p 4 p 3 r s s i b s a u d i o v b _ r e g p 1 v c c d i s k 1 p 9 a f c c e r a f i l g n d 1 0 0 . 0 1 1 5 p x t a l 2 2 p l e v e l c o m p f i l s w c o m p o u t a f c o f f a f c c . n r z c o m p c 3 l 1 c 1 c 6 r 5 1 0 0 k p 5 n r z r 6 2 2 0 r 4 1 0 0 k r 8 l e v e l g n d s 2 g n d 1 0 0 0 p c 1 4 s 1 g n d c 1 3 g n d p 2 a u d i o 6 8 0 p c 1 2 c 1 1 g n d 6 . 8 k r 7 c 1 0 g n d 1 2 3 4 5 6 7 8 9 1 2 1 1 1 0 c 8 c 7 c 4 c 5 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 2 4 2 3 2 2 2 1 g n d c 6 0 . 0 1 g n d p 8 g n d g n d 1 1 0 0 p ( 1 0 0 p + 1 0 0 0 p ) 1 4 2 0 p ( 1 2 0 0 p + 2 2 0 p ) application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility fo r any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same .
9 CXA3179N application notes 1) power supply the CXA3179N, with built-in regulator, is designed to permit stable operation at a wide range of supply voltage from 1.1 to 4.0 v. decouple the wiring to v cc (pin 4) as close to the pin as possible. 2) oscillator input oscillator input method a) using pins 1 and 2, input a self-excited oscillation signal through the composition of a colpitts type crystal oscillator circuit. b) directly input a local oscillation signal to pin 1. 3) mixer the mixer is of double-balance type. pin 24 is the input pin. input though a suitable matching circuit. the input impedance is 2.0 k . pin 3 serves as the output pin for the mixer, and a load resistance of 1.5 k is incorporated. 4) if filter the filter to be connected between this mixer output and the if limiter amplifier input should have the following specifications. i/o impedance : 1.5 k 10 % band width : changes according to applications. 5) if limiter amplifier the gain of this if limiter amplifier is approximately 100 db. take notice of the following points in making connection to the if limiter amplifier input pin (pin 5). a) wiring to the if limiter amplifier input (pin 5) should be as short as possible. b) as the if limiter amplifier output appears at quad (pin 8), wiring to the ceramic discriminator connected to quad should be as short as possible to reduce the interference with the mixer output and if limiter amplifier input. 1 2 3 v c c c e r a m i c f i l t e r 1 2 3 f r o m l o c a l s i g n a l c e r a m i c f i l t e r fig. 1 v c c 3 4 5 6 7 8 9 w i r e a s s h o r t a n d a p a r t a s p o s s i b l e a s s h o r t a s p o s s i b l e fig. 2
10 CXA3179N 6) quick charge in order to hasten the pin 7 rising time from when power is turned on, the CXA3179N features a quick charge circuit. the capacitance value connected to pin 7 should be chosen such that the voltage does not vary much due to discharge during battery saving. connect a signal for controlling the quick charge circuit to pin 18. setting this pin high enables the quick charge mode, and setting this pin low enables the steady-state reception mode. quick charge is used when the power supply is turned on. the battery saving must be set high at the time. connect pin 18 to gnd when quick charge is not being used. fig. 3 example when the pin 7 ref capacitance value is 1 f t1 in fig. 3 : 2-level data setting time after quick charge 0 ms t2 in fig. 3 : 4-level data setting time after quick charge 2 ms or less t3 in fig. 3 : 4-level data can be obtained t4 in fig. 3 : 2-level data can be obtained 5 m s 1 m s 1 m s a t 2 t 1 t 3 t 4 p o w e r s u p p l y t o t h e i c ( p i n 4 ) q u i c k c h a r g e ( p i n 1 8 ) b a t t e r y s a v i n g c o n t r o l ( p i n 1 7 )
11 CXA3179N 7) detector the detector is of quadrature type. to perform phase shift, connect a ceramic discriminator to pin 8. the phase shifting capacitor for the quadrature detector is incorporated. the fm (fsk) signal demodulated with the detector will be output to audio (pin 16) through the internal lpf. the audio output is the anti-phase output to the nrz out. the cdbm455c50 (murata mfg. co., ltd.) ceramic discriminator is recommended for the CXA3179N. for the 2-level system, the cdbm455c28 can also be used. fig. 4 the detector output level is changed according to the resistance value connected to pin 8. 8) filter buffer, level comparator and nrz comparator the lpf circuit is built in this ic. the lpf output is connected internally to the nrz comparator, level comparator and quick charge circuit. fig. 5 using the lpf, remove the noise from the demodulated signal and input the signal to the above three circuits. 6 . 5 k v c c 7 8 9 c e r a m i c d i s c r i m i n a t o r c d b m 4 5 5 c 5 0 l . c . 1 6 1 9 1 5 0 . 2 v l p f d e t 7
12 CXA3179N 8) -1. lpf constant the composition of the data filter is ternary. the first-stage cut-off f c1 is 1 f c1 = 2 c 11 r the second-stage cut-off f c2 is 1 c 12 f c2 = 2 r c 12 c 13 , q = c 13 c 11 , c 12 , c 13 : external capacitance shown in the application circuit r : ic internal resistance the butterworse characteristic is for c 12 =c 13 =c 14 . r is approximately 55 k 20 % when pin 12 is low. the table below shows the example of constants to data rate. 8) -2. comparator output the level comparator and the nrz comparator shape the waveform of this input signal and output it as a square wave. the comparator output stage is for open collector. thus, if the cpu is of cmos type and the supply voltage is different, a direct interface as illustrated in the figure below can be implemented. fig. 6 capacitance (pf) 6800 1500 pin9 1100 p pin10 680 p pin11 1420 p pin9 1100 p pin10 680 p pin11 1420 fc (hz) 430 950 1900 1000 2000 1000 2000 data rate 512 bps (2 levels) 1200 bps (2 levels) 2400 bps (2 levels) 1600 bps (2 levels) 3200 bps (2 levels) 3200 bps (4 levels) 6400 bps (4 levels) h l h l h l h l pin 12 filter switch 1 9 4 ( 1 5 ) v c c 1 . 4 v c m o s i c v c c c m o s p o w e r s u p p l y c o m p a r a t o r o u t p u t
13 CXA3179N 8) -3. level comparator output the level comparator characteristics are as shown in the figure below. therefore, a high signal is output at the bit border even if the input signal is a 4.8 khz signal. this high output interval varies according to the frequency response of the bit rate filter, and widens as the cut-off frequency becomes lower. the decoder avoids this high interval when processing data. 9) reg cont controls the base bias of the external transistors. 10) lva out this pin goes high (open) when the supply voltage becomes lower. since the output is an open collector, it can be used to directly drive the cmos device. the setting voltage of the lva is 1.05 v (typ.), and it possesses a hysteresis with respect to the supply voltage. the hysteresis width is 50 mv (typ.). 11) b.s. operation of the CXA3179N can be halted by setting this pin low. this pin can be connected directly to the cmos device. the current consumption for battery saving is 10 a or less (at 1.4 v). fig. 7 h l 4 . 8 1 . 6 + 1 . 6 + 4 . 8 f 0 i n p u t s i g n a l o u t p u t i n p u t f r e q u e n c y d e v i a t i o n [ k h z ] l e v e l c o m p a r a t o r o u t p u t 1 7 b . s .
14 CXA3179N 12) m-ary (m=2- or 4-level) fsk demodulation system 12)-1. output waveform polarity discrimination output and level comparator output are used to demodulate the 4-level waveform shown below. [4-level fsk demodulating waveform] [nrz out] polarity discrimination output (when the input frequency is higher than the local frequency) [l.c. out] level comparator output the 4-level fsk demodulating data is divided into an nrz out and l.c. out shown above. here, the nrz out corresponds to a conventional nrz comparator output. the l.c. out is made comparing the demodulated waveform amplitude to the ic internal reference voltage levels. when the threshold value of l.c. out is not appropriate to the detector output, the resistance value on pin 8 should be varied for the detector output level adjustment or the resistor should be inserted between pin 6 and v cc for the level comparator threshold value adjustment. for the 2-level fsk demodulation, it corresponds to a conventional nrz comparator output. 0 1 0 0 1 0 1 1 0 1 1 0 0 0 + 4 . 8 k h z + 1 . 6 k h z 1 . 6 k h z 4 . 8 k h z 0 0 1 1 0 1 0 p o s n e g 1 0 0 1 1 0 0 1 . 6 k h z 4 . 8 k h z the polarity can be inverted by setting the local frequency higher than the input frequency. 6 r v c c
15 CXA3179N 12)-2. 4-level signal and threshold value the demodulated signal is optimally matched to the nrz comparator threshold value by applying afc (see 13) afc). (operation point correction using a feedback loop filter) the comparator threshold value is fixed. the level comparator threshold value can be adjusted by varying the detector output level by changing the damping resistance of the discriminator. (ac gain adjustment) ac gain adjustment 12)-3. offset amount and threshold value immediately after power-on when the ref capacitor is not charged with the correction voltage, if the input frequency has an offset, some time is required to correct this offset. in addition, the times required to obtain 2-level and 4-level data differ according to the offset amount. a) 2-level signals in the case of 2-level signals, correct data is obtained when the offset amount is smaller than the detector output amplitude. this is 75 mv or less when the detector output level is 150 mvp-p which corresponds to within 4.8 khz when converted to a frequency by the s curve. thus, 2-level data is obtained without an operation point correction time lag when the frequency offset is within 4.8 khz. b) 4-level signals in the case of 4-level signals, correct data is obtained when the offset amount is less than 1/3 of the detector output amplitude (during 4.8 khz dev). this is 25 mv or less when the detector output level is 150 mvp-p which corresponds to 1.6 khz or less when converted to a frequency by the s curve. thus, 4- level data is obtained without an operation point correction time lag when the frequency offset is within 1.6 khz as shown above, 4-level signals have an allowable offset range 1/3 that of 2-level signals. when the offset exceeds this allowable range, time is required to determine the operation point and obtain correct data through feedback. also, even if the offset is within the allowable range, the output pulse duty changes until the offset is 0. l e v e l c o m p a r a t o r t h r e s h o l d v a l u e 1 n r z t h r e s h o l d v a l u e = d e m o d u l a t e d s i g n a l a v e r a g e v o l t a g e l e v e l c o m p a r a t o r t h r e s h o l d v a l u e 2 n r z t h r e s h o l d v a l u e o f f s e t l e v e l c o m p a r a t o r t h r e s h o l d v a l u e 1 n r z t h r e s h o l d v a l u e o f f s e t l e v e l c o m p a r a t o r t h r e s h o l d v a l u e 2
16 CXA3179N 13) afc the afc is of the current output type which outputs the frequency deviation in the form of the current and converts it to the voltage. the output current range is approximately 0.4 a for the slow mode and 70 a for the fast mode. the circuit to be connected with this pin should have the higher impedance. the operating range of the afc pin is between approximately 0.1 v to (v cc C0.2) v. use the buffer amplifier to expand the operating range. the pin 7 voltage v continues to change till the vin value reaches the vref value. when these values are equal, the pin 7 output current becomes 0 and the voltage is determined by the charge and time. therefore, the pin 7 voltage is undefined. the afc voltage varies, for example, as shown below by the vco characteristics. the afc voltage follows the vco characteristics because this voltage is independent of the slope of the s curve. in other words, the CXA3179N operates according to the vco characteristics when the vco characteristics have the linearity with respect to the voltage and the vco characteristics can be controlled within the range shown in the graph below. v r e f c v = i t / c l p f v r e f b u f r f 1 9 c o m p 1 6 a u d i o 1 s t m i x 1 s t o s c v c o 7 t o c x a 3 1 7 9 n e x t e r n a l p a r t s v i n ( s c u r v e v o l t a g e ) ( v c c 0 . 2 ) v 0 . 1 v f 0 a b c p i n 7 v o l t a g e i n p u t f r e q u e n c y
17 CXA3179N 14) sensitivity adjustment method the constants shown in the application circuit are for the standard external parts. however, adjustment may be necessary depending on the conditions of use, characteristics of external parts, and the rf system circuit and decoder connected to the if ic, etc. adjust the sensitivity according to the following procedures. a) mix in matching when using a matching circuit between the rf system circuit and mix in of the CXA3179N, adjust the trimmer to obtain the optimal sensitivity while monitoring the audio output. b) local input level the mixer circuit gain is dependent on the local signal input level to osc in. the input level to osc in should be set as high as possible within the range of C6 to +2 dbm as shown in the graph of local input level vs. mixer gain characteristics. however, care should be taken as raising the input level above +2 dbm will cause the sensitivity to drop. when creating the local signal using the internal oscillator circuit, the oscillation level varies according to the external capacitances attached to pins 1 and 2 and the characteristics of the used crystal. therefore, be sure to adjust the external capacitance values attached to pins 1 and 2 according to the crystal characteristics. c 1 and c 2 have the following range in the figure above. c 1 3 c 2 c 1 = c 2 to c 1 =5c 2 as for the ratio of c 1 to c 2 , the oscillation stabilizes as c 1 approaches equality with c 2 . the oscillation level decreases as the c 1 and c 2 values become larger, and increases as the c 1 and c 2 values become smaller. use a fet probe to confirm the local input level. c) lpf constant the data filter cut-off may need to be changed depending on the characteristics of the connected decoder. adjust the capacitance values of pins 9 to 12 while checking the incoming sensitivity including the decoder. if the capacitance values are too large, the detector output waveform will deviate at high data rates, causing the sensitivity to drop. conversely, if the capacitance values are too small, the lpf will be easily affected by noise, causing the sensitivity to drop. adjust capacitance values of pins 9 to 12 so that the capacitance value described in 8)-1. lpf constant becomes smaller. o s c 1 2 c 1 c 2 v c c
18 CXA3179N d) detector output level the nrz comparator and level comparator threshold values are fixed for the CXA3179N. in the case of 4- level signals, the relationship between the level comparator threshold value and the detector output level affects the sensitivity. the detector output level can be adjusted by the resistance attached to pin 8. increasing the resistance value also increases the output level, and vice versa. the pin 8 resistance value differs according to the ceramic discriminator attached to pin 8. when the discriminator is changed to a different type, the resistance value must be adjusted. adjust the resistance value while monitoring the level comparator output waveform or the sensitivity including the decoder. e) afc the CXA3179N uses afc to correct the if frequency deviation. when the if frequency deviation amount is large, correction takes time and may lower the sensitivity. adjust the oscillator frequency of the local oscillator so that the center frequency of the signal input to pin 5 (if in) is as close to 455 khz as possible. 15) CXA3179N standard board description ? outline this board contains the external parts shown in the application circuit in order to evaluate the CXA3179N operation ? features the following CXA3179N basic operations can be checked. 1) varying the data filter cut-off 2) battery saving and other mode switching 3) nrz output and level comparator output pins 4) afc pin pin 7 serves as the output pin for the afc. ? method of use 1) input the CXA3179N supply voltage v cc =1.4. this ic operates with a single power supply. 2) the CXA3179N uses a 21.245 mhz crystal. input the rf signal from the rf pin and use this ic in the condition where if=455 khz. 3) the afc pin voltage is undefined with the ic itself because the current output circuit is employed for the afc. for the evaluation, be sure to apply the bias to the afc pin externally or to make the afc loop. 4) set the mode switches. ? mode switch setting mode switches s1, s2, s3 and s4 are provided in four locations in the board. each basic operation can be confirmed by switching these mode switches while referring to the board layout. see the table in 15) control pins for the mode switching. ? device specification see these specifications for the ic specifications. the ics for this evaluation board are es specification. ? circuit diagram the circuit diagram is the same as the application circuit in these specifications.
19 CXA3179N 15) -1. standard board layout 15) -2. mode switch pattern 2 4 1 3 x t a l 1 1 2 c e r a f i l d i s k s 2 s 3 r f p n p v c c g n d 3 1 7 9 e v a l u a t i o n b o a r d s 4 s 1 l o w h i g h s 4 s l o w c h a r g e q u i c k c h a r g e a f c c . l h s 3 s l e e p i c o p e r a t i o n b . s . l h s 2 a f c o p e r a t i o n a f c o f f a f c - o f f l h s 1 f c : h i g h f c : l o w f i l s w
20 CXA3179N 15) -3. list of standard board parts resistor capacitor inductor active component crystal value part # remarks (manufacture) note 220 8.7 k 100 k r4 r7 r5 r6 r8 (river) e12 series 1/8w 1.8 h l1 el0405 (tdk products) e12 series 2.5 mm pitch (lead pitch) pnp 2sa1015 (toshiba corporation) 21.245 mhz xtal nr-18bn (nihon dempa kogyo co., ltd.) 6.8 p to 45 p 15 p 22 p 100 p 1000 p 1100 p 680 p 1420 p 0.01 1 10 c2 c5 c4 c14 c3 c11 c12 c13 c8 c9 c10 c6 c7 tz03p450fr169 (murata products) dd100 series temperature characteristics type b (murata products) 25 v 1 (shin-ei tushin kogyo co., ltd.) 25 v 10 (shin-ei tushin kogyo co., ltd.) trimmer capacitor ceramic capacitor e12 series (high dielectric constant type) electrolytic capacitor e6 series
21 CXA3179N ceramic filter ceramic discriminator switch connector pin s1, s2 s3, s4 ate1d-2m3-10 (fujisoku corporation) on-on (1 poles) rf hrm300-25 (hirose electric co., ltd.) sma connector 2 6 mac 8 test pin st-1-3 (mac eight) mac 8 test pin lc-2-g (mac eight) l=10 mm 0.8 f cerafil cfws455d (murata products) 455 khz 1.5 k disc cdbm455c50 (murata products) 455 khz
22 CXA3179N m i x e r i n p u t a u d i o r e s p o n s e a n d r s s i c h a r a c t e r i s t i c s a u d i o r e s p o n s e [ d b ] r s s i [ m v ] s / n s + n + d r f 2 1 . 7 m h z l o c a l 2 1 . 2 4 5 m h z 6 d b m a u d i o 1 . 6 k h z c w d e v . 4 . 8 k h z 0 d b = 6 3 . 1 m v r m s v c c = 1 . 4 v t = 2 5 c r s s i 0 1 0 2 0 3 0 4 0 5 0 6 0 1 2 0 1 1 0 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 8 0 0 6 0 0 4 0 0 2 0 0 0 1 . 4 1 . 3 1 . 2 1 . 1 1 . 0 0 . 9 1 . 0 2 . 0 3 . 0 4 . 0 f 1 + f 2 f o 2 0 3 0 4 0 5 0 6 0 7 0 8 0 6 0 5 0 4 0 3 0 2 0 1 0 0 m i x e r i n p u t l e v e l [ d b m ] c u r r e n t c o n s u m p t i o n c h a r a c t e r i s t i c s s u p p l y v o l t a g e [ v ] c u r r e n t c o n s u m p t i o n [ m a ] o u t p u t l e v e l [ d b m ] m i x e r i / o c h a r a c t e r i s t i c s a n d 3 r d i n t e r c e p t p o i n t m i x e r i n p u t l e v e l [ d b m ] t h e i / o l e v e l i s f o r t h e v a l u e s r e a d a t i / o p i n w i t h t h e s p e c t r u m a n a l y z e r f o = 2 1 . 7 m h z f l o = 2 1 . 2 4 5 m h z 6 d b m f 1 = 2 1 . 7 2 5 m h z f 2 = 2 1 . 7 5 0 m h z example of representative characteristics
23 CXA3179N 0 . 0 1 1 0 5 0 5 2 0 1 5 1 0 5 0 5 f r f 2 1 . 7 m h z 6 0 d b m f l o 2 1 . 2 4 5 m h z 1 5 0 0 1 0 2 0 3 0 4 0 5 0 6 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k 2 . 0 1 . 8 1 . 6 1 . 4 1 . 2 1 . 0 0 . 8 0 . 6 0 . 4 0 . 2 0 1 5 0 2 0 0 2 5 0 3 0 0 l o c a l i n p u t l e v e l v s . m i x e r g a i n c h a r a c t e r i s t i c s m i x e r g a i n [ d b ] l o c a l i n p u t l e v e l [ d b m ] v a r i a b l e c u t - o f f c h a r a c t e r i s t i c s o f a u d i o f i l t e r r e s p o n s e [ d b ] i n p u t f r e q u e n c y [ h z ] p i n 1 2 v o l t a g e l h l e v e l c o m p a r a t o r c h a r a c t e r i s t i c s c o m p a r a t o r o u t p u t v o l t a g e [ m v ] c o m p a r a t o r i n p u t v o l t a g e [ m v ]
24 CXA3179N 3 0 0 2 5 0 2 1 0 2 0 0 1 5 0 1 0 0 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 1 . 6 1 . 4 1 . 2 1 . 0 0 . 8 0 . 6 0 . 4 0 . 2 0 1 6 0 1 8 0 2 0 0 2 2 0 2 4 0 2 6 0 1 . 2 1 . 0 0 . 8 0 . 6 0 . 4 0 . 2 0 1 . 0 0 1 . 0 5 1 . 1 0 1 . 1 5 l e v e l c o m p a r a t o r t h r e s h o l d v a l u e c o n t r o l c h a r a c t e r i s t i c s ( o u t p u t l o w ? h i g h s w i t c h i n g l e v e l ) l e v e l c o m p a r a t o r t h r e s h o l d v a l u e [ m v ] p i n 6 c u r r e n t [ a ] t y p i c a l v a l u e w h e n p i n 6 i s s h o r t e d t o v c c r e p r e s e n t a t i v e e x a m p l e u s i n g t y p i c a l s a m p l e n r z c o m p a r a t o r c h a r a c t e r i s t i c s c o m p a r a t o r o u t p u t v o l t a g e [ v ] c o m p a r a t o r i n p u t v o l t a g e [ m v ] l v a c h a r a c t e r i s t i c s l v a c o m p a r a t o r o u t p u t v o l t a g e [ v ] s u p p l y v o l t a g e [ v ]
25 CXA3179N 2 0 c 0 c 2 5 c 5 0 c 7 5 c : : : : : : h l : l h 8 0 0 7 0 0 6 0 0 5 0 0 4 0 0 3 0 0 2 0 0 1 0 0 1 2 0 1 1 0 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 5 0 0 5 0 1 0 0 2 0 0 2 5 5 0 7 5 r s s i o u t p u t v o l t a g e t e m p e r a t u r e c h a r a c t e r i s t i c s r s s i o u t p u t v o l t a g e c h a r a c t e r i s t i c s [ m v ] r f i n p u t l e v e l [ d b m ] d e t e c t o r o u t p u t l e v e l a n d l e v e l c o m p a r a t o r t h r e s h o l d v a l u e t e m p e r a t u r e c h a r a c t e r i s t i c s d e t e c t o r o u t p u t l e v e l a n d l e v e l c o m p a r a t o r t h r e s h o l d v a l u e [ m v ] t e m p e r a t u r e [ c ] 4 . 8 k h z d e v . d e t e c t o r o u t p u t l e v e l l e v e l c o m p a r a t o r t h r e s h o l d v a l u e f o r p o s i t i v e s i d e 1 . 6 k h z d e v . d e t e c t o r o u t p u t l e v e l l e v e l c o m p a r a t o r t h r e s h o l d v a l u e f o r n e g a t i v e s i d e
26 CXA3179N 8 0 6 0 4 0 2 0 0 4 4 7 4 5 0 4 5 5 4 6 0 4 6 3 2 0 4 0 6 0 8 0 0 . 7 0 . 5 0 . 3 0 0 . 3 0 . 5 0 . 7 f a s t s l o w a f c o f f 3 4 0 3 2 0 3 0 0 2 8 0 2 6 0 4 4 7 4 5 0 4 5 5 4 6 0 4 6 3 2 4 0 2 2 0 2 0 0 1 2 0 1 8 0 1 6 0 1 4 0 1 0 0 a f c o u t p u t c u r r e n t c h a r a c t e r i s t i c s i f i n p u t f r e q u e n c y [ k h z ] f a s t c u r r e n t [ a ] s l o w c u r r e n t [ a ] a u d i o o u t p u t d c v o l t a g e [ m v ] s c u r v e c h a r a c t e r i s t i c s i f i n p u t f r e q u e n c y [ k h z ]
s o n y c o d e e i a j c o d e j e d e c c o d e s s o p - 2 4 p - l 0 1 s s o p 0 2 4 - p - 0 0 5 6 p a c k a g e m a t e r i a l l e a d t r e a t m e n t l e a d m a t e r i a l p a c k a g e m a s s e p o x y r e s i n s o l d e r / p a l l a d i u m 4 2 / c o p p e r a l l o y p a c k a g e s t r u c t u r e p l a t i n g 0 . 1 g 2 4 p i n s s o p ( p l a s t i c ) 0 . 1 0 . 1 0 t o 1 0 0 . 5 0 . 2 d e t a i l a * 5 . 6 0 . 1 2 4 * 7 . 8 0 . 1 1 3 0 . 6 5 1 2 1 7 . 6 0 . 2 0 . 1 1 . 2 5 0 . 1 + 0 . 2 a 0 . 1 3 m n o t e : d i m e n s i o n * d o e s n o t i n c l u d e m o l d p r o t r u s i o n . b = 0 . 2 2 0 . 0 5 + 0 . 1 0 . 1 5 0 . 0 2 + 0 . 0 5 ( 0 . 2 2 ) ( 0 . 1 5 ) 0 . 1 5 0 . 0 1 d e t a i l b : s o l d e r d e t a i l b : p a l l a d i u m + 0 . 0 3 b = 0 . 2 2 0 . 0 3 b b package outline unit : mm CXA3179N 27 n o t e : p a l l a d i u m p l a t i n g t h i s p r o d u c t u s e s s - p d p p f ( s o n y s p e c . - p a l l a d i u m p r e - p l a t e d l e a d f r a m e ) .

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