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1 e95517c8y 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 375 mw operating condition supply voltage v cc 1 1.1 to 4.0 v description the CXA1999N is a low current consumption fm if amplifier which employs the newest bipolar process. it is suitable for m-ary fsk pagers. features ? low current consumption: 1.16 ma (typ. at v cc = 1.4 v) ? low voltage operation: v cc = 1.1 to 4.0 v ? small package 20-pin ssop ? second mixer and oscillator ? needless of if decoupling capacitor ? reference power supply for operational amplifier and comparator ? if input, v cc standard applications ? m-ary fsk pagers ? double conversion pagers structure ? bipolar silicon monolithic ic if amplifier for m-ary fsk pagers 20 pin ssop (plastic) CXA1999N
2 CXA1999N 1 2 3 4 5 6 7 8 9 1 0 o s c i n o s c o u t m i x o u t v c c i f i n b . s . f s k r e f q u a d d e t o u t r s s i m i x i n 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 g n d r e g o u t r e g c o n t l v a o u t n r z o u t c h a r g e l . c . o u t l p f o u t l p f i n q u a d d e t q u i c k c h a r g e i f l i m m i x e r l o c a l o s c i l l a t o r r e g u l a t o r a l a r m n r z c o m p a r a t o r l e v e l c o m p a r a t o r block diagram and pin configuration
3 CXA1999N pin description pin no. symbol pin voltage equivalent circuit description 1 2 3 4 5 6 7 osc in osc out mix out v cc if in b.s. fsk ref 1.4 v 0.7 v 1.2 v 1.4 v 0.2 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. controls the battery saving. setting this pin low suspends the operation of ic. (applied voltage range: C0.5 v to +7.0 v) connects the capacitor that determines the low cut-off frequency for the entire system. 2 1 v c c 3 0 0 1 5 k 2 3 0 g n d 7 2 1 5 k 3 v c c g n d 1 . 5 k 5 v c c 1 . 5 k g n d 1 . 5 k 8 k 8 k 6 7 2 4 0 k 1 4 0 k g n d 7 v c c g n d 7 2
4 CXA1999N pin no. symbol pin voltage equivalent circuit description 8 9 10 11 12 quad det out rssi lpf in lpf out 1.4 v 0.2 v 0 v 0.2 v 0.2 v connects the phase shifter of fm detector circuit. fm detector output. rssi circuit output. operational amplifier input. level comparator and nrz comparator inputs. output for operational amplifier is connected. 8 v c c 2 2 k g n d 2 0 p 2 0 k 9 v c c g n d 5 0 p 5 5 k 7 2 1 0 v c c g n d 7 k 7 k 7 0 k 1 1 v c c g n d 7 2 1 2 v c c g n d 7 2 7 2
5 CXA1999N pin no. symbol pin voltage equivalent circuit description 13 15 16 14 17 18 19 20 l.c. out nrz out lva out charge reg cont reg out gnd mix in 0 v 1.0 v 1.4 v level comparator, nrz comparator and lva comparator outputs. they are open collectors. (applied voltage range: C0.5 v to +7.0 v) controls the on/off operation of the quick-charge circuit. set this pin high to execute the quick charge. (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. 1 4 2 0 k 1 0 0 k g n d 1 3 1 5 1 6 7 2 g n d 1 7 v c c g n d 7 2 1 8 v c c g n d 7 8 k 1 k 2 2 k 2 0 v c c g n d 2 k 4 . 1 6 k 4 . 1 6 k
6 CXA1999N item current consumption current consumption am rejection ratio op amp. input bias current op amp. maximum output level 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 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 symbol i cc i ccs amrr i bias v o 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 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 3 30k lpf measurement circuit 2 measurement circuit 4 measurement circuit 6 vin = 0.3 v measurement circuit 5 vin = 0.1 v measurement circuit 5 vin = 0.1 to 0.3 v measurement circuit 7 measurement circuit 7 output current 0 a measurement circuit 8 v1 = 1.4 to 1.0 v measurement circuit 8 v1 = 1.0 v measurement circuit 9 measurement circuit 3 measurement circuit 3 measurement circuit 11 measurement circuit 10 measurement circuit 12 typ. 1.16 6 10 0.96 1.05 50 5 400 2.0 1.5 1.5 max. 1.5 20 100 0.4 5.0 20 0.4 1.04 1.10 5.0 0.4 68 0.35 14 0.4 5.0 550 2.4 1.8 1.8 unit ma a db na mvp-p v a mv a v v v a v mvrms v v db v a mv k k k min. 0.8 25 160 100 0.89 1.00 38 0.9 1.6 1.2 1.2 (v cc = 1.4 v, ta = 25 c, fs = 21.7 mhz, f mod = 1.6 khz, f dev = 4.8 khz, am mod = 30 %)
7 CXA1999N electrical characteristics measurement circuit 1 . 0 v v c c v 1 1 . 4 v 1 2 3 4 5 6 7 8 9 1 0 2 2 p v 2 1 5 p 1 4 . 7 k 1 . 8 0 . 2 v v 3 v i n 0 . 0 1 1 0 p t o 1 2 0 p 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 v 1 2 3 4 5 6 7 8 9 1 0 v 2 1 . 0 v v 1 v c c 1 . 4 v v i n 5 0 a 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 v 1 2 3 4 5 6 7 8 9 1 0 a v c c v 1 1 . 4 v g n d v 2 1 . 0 v g n d g n d g n d 0 . 2 v v 3 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 1 2 3 4 5 6 7 8 9 1 0 v 2 v c c v 1 1 . 4 v a 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 1 2 3 4 5 6 7 8 9 1 0 v 2 1 . 0 v v 1 v c c 1 0 0 k 1 . 4 v v i n a v 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 1 2 3 4 5 6 7 8 9 1 0 v 2 1 . 0 v v 1 1 . 4 v v c c 0 . 2 v v 3 v i n 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 v measurement circuit 1 measurement circuit 4 measurement circuit 5 measurement circuit 6 measurement circuit 2 measurement circuit 3
8 CXA1999N 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 v 1 v c c v 2 1 . 0 v 1 . 4 v 5 0 a v 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 v 1 v c c v 2 1 . 0 v 1 . 4 v v 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 v 1 v c c v 3 0 . 2 v a 1 0 0 k v 1 2 3 4 5 6 7 8 9 1 0 v 2 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 1 . 0 v v 1 v c c 1 . 4 v v 3 1 0 0 a 0 . 5 v g n d g n d v 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 v 1 v c c v 2 1 . 0 v 1 . 4 v 0 . 1 v v i n 5 0 a v 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 v 1 v c c v 2 1 . 0 v 1 . 4 v 1 0 0 k a 0 . 2 v v i n v measurement circuit 7 measurement circuit 10 measurement circuit 11 measurement circuit 12 measurement circuit 8 measurement circuit 9
9 CXA1999N 1 2 3 4 5 6 7 8 9 1 0 o s c i n o s c o u t m i x o u t v c c i f i n b . s f s k r e f q u a d d e t o u t r s s i m i x i n 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 g n d r e g o u t r e g c o n t a l m n r z o u t c h a r g e l . c . o u t l p f o u t l p f i n q u a d d e t q u i c k c h a r g e i f l i m v c c r s s i v c c c f w 4 5 5 d r e g o u t a l a r m n r z o u t c o m p o u t c d b m 4 5 5 c 2 8 1 . 8 0 . 0 1 1 0 1 1 0 0 k 1 0 0 k 1 0 0 k 3 9 k 3 9 k 5 6 0 p 2 2 0 0 p 1 2 0 0 p 3 9 k 1 0 0 p 4 . 7 k 1 5 p 2 2 p 1 0 p t o 1 2 0 p v c c 2 2 0 0 . 0 1 m i x e r l o c a l o s c i l l a t o r r e g u l a t o r a l a r m n r z c o m p a r a t o r l e v e l c o m p a r a t o r application circuit 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 .
10 CXA1999N application note 1) power supply the CXA1999N, with built-in regulator, is designed to permit stable operation at 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 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 20 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) be sure to wire to the if limiter amplifier input (pin 5) is as short as possible. b) as the if limiter amplifier output appears at quad (pin 8), be sure to wire to the ceramic discriminator connected to quad is as short as possible and reduce the interference with the mixer output and if limiter amplifier input. 2 3 1 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 4 5 6 7 9 3 8 v c c s h o r t e s t p o s s i b l e w i r i n g s w h i c h m u s t b e a p a r t a s f a r 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
11 CXA1999N 6) quick charge in order to hasten the rising time from when power is turned on, the CXA1999N features a quick charge circuit. therefore, the quick charge circuit eliminates the need to insert a capacitor between the detector output and the lpf as is the case with conventional ics, but connects a capacitor to pin 7 to determine the average signal level during steady-state reception. the capacitance of the capacitor 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 14. 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 14 to gnd when quick charge is not being used. 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 demodulated fm (fsk) signal with the detector will be output to det out (pin 9) through the internal primary lpf. det out output impedance is 200 or less. the det out output is the anti-phase output to nrz out. the cdbm455c28 (murata mfg. co., ltd.) ceramic discriminator is recommended for the CXA1999N. fig. 3 7 9 8 4 . 7 k v c c d e t o u t p u t 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 2 8 h l h l a c t i v e b a t t e r y s a v i n g t i m i n g p o w e r s u p p l y ( p i n n u m b e r 4 ) q u i c k c h a r g e ( p i n n u m b e r 1 4 ) b a t t e r y s a v e ( p i n n u m b e r 6 )
12 CXA1999N 8) filter buffer, level comparator and nrz comparator an operational amplifier for lpf is built in this ic. it is connected internally to the nrz comparator, level comparator and quick charge circuit. using the operational amplifier of pins 11 and 12 to construct an lpf, remove noise from the demodulated signal and input the signal to the above three circuits. the level comparator and the nrz comparator shape 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. 9) reg cont controls the base bias of the external transistors. 10) lva out this pin goes high (open) when the supply voltage becomes low. since the output is an open collector, it can be used to directly drive 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 CXA1999N can be halted by setting this pin low. this pin can be connected directly to cmos device. the current consumption for battery saving is 20 a or less (at 1.4 v). 7 l . c . 1 1 1 4 1 5 1 2 1 3 0 . 2 v 1 3 4 v c c ( 1 5 ) v c c 1 . 4 v c m o s i 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 fig. 6 6 b . s . fig. 7
13 CXA1999N 12) m-ary (m = 2- or 4-level) fsk demodulation system polarity discrimination output and msb 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] msb 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 adjusted for the detector output level 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.
14 CXA1999N 13) principle of quick charge operation buf in fig. 8 is the detector buffer amplifier, and amp is an operational amplifier to construct an lpf. comp is the level comparator or the nrz comparator. the CXA1999N has a feedback loop from the comparator input to the input circuit of the detector output buffer. this equalizes the average value of the comparator input voltage to the reference voltage, with the quick charge circuit of chg being set in the feedback loop. switching the current of the quick charge circuit enables reduction of the rise time. in this block, chg is a comparator which compares input voltages and outputs a current based on this comparison. the current on chg is switched between high and low at pin 14. when the power is turned on, switch the current to high to increase the charge current at c in fig. 8 and shorten the time constant. during steady-state reception mode, switch the current to low, lengthening the charge time constant and allowing for stable data retrieval. c c h g b u f a m p c o m p r e f e r e n c e v o l t a g e fig. 8 r 1 r 2 r 3 c 1 c 3 c 2 512 1200 2400 3200 (6400) * r 1 22 k 68 k 39 k 39 k r 2 22 k 68 k 39 k 39 k r 3 22 k 68 k 39 k 39 k c 1 0.015 f 2700 pf 1500 pf 1200 pf c 2 0.027 f 4700 pf 3300 pf 2200 pf c 3 6800 pf 820 pf 820 pf 560 pf fc (hz) 350 800 1.7 k 2.3 k bps parameter * for 4 levels note on operation : measures for the prevention of electrostatic breakdown should be taken to handle this ic. 14) s curve characteristics even if the if in input signal frequency is deviated, the feedback is applied to the det out operating point so as to match it to the comparator reference voltage by the quick charge operation shown in fig. 8. therefore, this feedback must be halted in order to evaluate the s curve characteristics. to execute the evaluation, measure the average voltage on pin 12 first and input this voltage to pin 7 from the external power supply. 1 5) example of data filter constants
15 CXA1999N 3 9 k 3 9 k 3 9 k 1 2 0 0 p 5 6 0 p 1 1 1 2 2 2 0 0 p d e t o u t l p f o u t f c : 2 . 3 k h z 0 1 0 2 0 3 0 4 0 5 0 1 2 0 1 1 0 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 1 0 0 0 8 0 0 6 0 0 4 0 0 2 0 0 0 s + n + d r s s i r f 2 1 . 7 m h z 4 . 8 k d e v . 1 . 6 k a u d i o l o n r f i n p u t l e v e l v s . a u d i o r e s p o n s e , r s s i c h a r a c t e r i s t i c s f o r 1 . 6 k h z s i n s i g n a l a u d i o r e s p o n s e ( d b ) * m a t c h i n g c i r c u i t i s u s e d 2 1 . 2 4 5 m h z 1 0 d b m v c c : 1 . 4 v 0 d b = 5 0 m v r m s d a t a f i l t e r 2 . 3 k h z r s s i o u t p u t v o l t a g e ( m v ) r f i n p u t l e v e l ( d b m ) example of representative characteristics filter constants of the graph above
16 CXA1999N 6 8 k 6 8 k 6 8 k 2 7 0 0 p 8 2 0 p 1 1 1 2 4 7 0 0 p d e t o u t f c : 8 0 0 h z 0 1 0 2 0 3 0 4 0 5 0 1 2 0 1 1 0 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 r f i n p u t l e v e l ( d b m ) 1 0 0 0 8 0 0 6 0 0 4 0 0 2 0 0 0 s + n + d r s s i r f l o 2 1 . 2 4 5 m h z 1 0 d b m 0 d b = 5 0 m v r m s d a t a f i l t e r 8 0 0 h z n 2 1 . 7 m h z 4 . 5 k h z d e v . 6 0 0 h z a u d i o r f i n p u t l e v e l v s . a u d i o r e s p o n s e , r s s i c h a r a c t e r i s t i c s f o r 6 0 0 h z s i n s i g n a l a u d i o r e s p o n s e ( d b ) * m a t c h i n g c i r c u i t i s u s e d r s s i o u t p u t v o l t a g e ( m v ) example of representative characteristics filter constants of the graph above
17 CXA1999N 0 . 9 1 . 0 1 . 1 1 . 2 1 . 3 1 . 4 0 . 8 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 s u p p l y v o l t a g e v s . c u r r e n t c o n s u m p t i o n c u r r e n t c o n s u m p t i o n ( m a ) s u p p l y v o l t a g e ( v ) 2 0 m i x e r g a i n ( d b ) 2 0 1 0 0 1 0 3 0 l o c a l i n p u t l e v e l ( d b m ) 2 0 1 0 0 0 . 2 c o m p a r a t o r o u t p u t v o l t a g e ( v ) 0 0 . 6 1 . 0 1 . 4 1 7 0 c o m p a r a t o r i n p u t v o l t a g e ( m v ) 2 0 0 2 2 0 2 5 0 2 7 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 l e v e l c o m p a r a t o r w i t h i f f i l t e r l o a d r f 2 1 . 7 m h z 6 0 d b m m a t c h i n g c i r c u i t p r o v i d e d l e v e l d i f f e r e n c e b e t w e e n p i n 2 0 a n d p i n 3
18 CXA1999N 3 0 d e t e c t o r o u t p u t l e v e l ( m v r m s ) 7 0 6 0 5 0 4 0 2 5 t e m p e r a t u r e ( c ) 2 5 5 0 0 d e t e c t o r o u t p u t l e v e l t e m p e r a t u r e 1 0 0 t h r e s h o l d l e v e l - 2 1 0 m v ( m v ) 5 0 0 5 0 1 0 0 2 5 0 2 5 5 0 7 5 l e v e l c o m p a r a t o r t e m p e r a t u r e v s . t h r e s h o l d l e v e l 0 . 2 c o m p a r a t o r o u t p u t v o l t a g e ( v ) 0 0 . 6 1 . 0 1 . 4 1 6 0 c o m p a r a t o r i n p u t v o l t a g e ( m v ) 1 8 0 2 0 0 2 2 0 2 4 0 n r z c o m p a r a t o r 2 6 0 2 8 0 7 5 : h ? l : l ? h t e m p e r a t u r e ( c )
2 0 p i n s s o p ( p l a s t i c ) 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 p a c k a g e s t r u c t u r e 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 0 . 1 g s s o p - 2 0 p - l 0 1 s s o p 0 2 0 - p - 0 0 4 4 p l a t i n g 0 . 1 0 . 1 0 . 5 0 . 2 0 t o 1 0 d e t a i l a 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 * 6 . 5 0 . 1 * 4 . 4 0 . 1 0 . 6 5 2 0 1 1 1 0 1 a 0 . 1 1 . 2 5 0 . 1 + 0 . 2 6 . 4 0 . 2 0 . 1 3 m b package outline unit : mm CXA1999N 19 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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