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1 e93313d8x 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. recommended operating conditions supply voltage v cc 2 to 9 v structure bipolar silicon monolithic ic description the cxa1538m/n/s is high performance one-chip bipolar ics designed for fm stereo/am radios. these include an fm/am front end, fm/am if amplifier, fm/am detection output and fm stereo demodulator output. features ? low current consumption (in fm mode i d =11.0 ma, in am mode 8.5 ma, v cc =6.0 v) ? built-in led drive circuit for tuning ? built-in led drive circuit for stereo indicator ? built-in muting circuit for the fm band ? few external parts absolute maximum ratings (ta=25 c) ? supply voltage v cc 14 v ? operating temperature topr C10 to +60 c ? storage temperature tstg C55 to +150 c ? junction temperature tjmax 125 c ? allowable power dissipation p d cxa1538m 500 mw cxa1538n 410 mw CXA1538S 1050 mw fm stereo/am radio cxa1538m CXA1538S 30 pin sop (plastic) 30 pin sdip (plastic) block diagram detune muting control tuning ind dc amp dc amp bu amp bu amp auto blend muting fm if/ discri am if/det am fe regulator multiplex regulator pd 1 pd 2 1/2 counter decode amp ripple filter st ind m/st sw pll lpf1 pilot det lpf2 pilot det lpf2 st ind vco check rch out lch out v cc ripple filter agc afc 1 agc afc 2 gnd tune ind fm if in am if in band select vco gnd pll lpf 2 mpx reg vco fm discri mute am osc afc fm osc reg fm rf am rf in fm rf in fe gnd fm/am fe out fm fe pd : phase detector bu : buffer fe : front end det : detector ind : indicator 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 cxa1538m/n/s cxa1538n 30 pin ssop (plastic)
2 cxa1538m/n/s pin description and equivalent circuit pin voltage (v) no. symbol v cc =3 v v cc =6 v equivalent circuit description fm am fm am 1 29 2 3 4 5 6 7 8 9 10 pll lpf1 pll lpf2 pilot det lpf1 pilot det lpf2 st ind vco check rch out lch out v cc ripple filter agc/afc1 agc/afc2 0.97 0.97 0.97 0.97 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 1.6 1.6 4.5 4.5 0.66 0.66 1.5 1.5 0.66 0.66 1.5 1.5 3.0 3.0 6.0 6.0 2.7 2.7 4.0 4.0 1.32 1.15 1.32 1.15 1.15 1.47 1.15 1.47 m p x r e g 2 6 k 2 6 k 1 2 9 2 3 m p x r e g 6 k v c o 4 5 6 1 7 k 1 7 k 1 4 0 k 3 3 k 8 2 2 k 5 0 k 3 . 2 5 k 2 5 k 9 1 0 lpf for pll lpfs c (1 f) for pilot det inserted between pins 2 and 3 stereo indicator drive circuit and output for vco check stereo rch output pin stereo lch output pin supply pin ripple filter afc pin in j band, determines time constant of agc in am (depending on external capacitor). afc pin in w band, determines time constant of agc in am (depending on external capacitor).
3 cxa1538m/n/s pin voltage (v) no. symbol v cc =3 v v cc =6 v equivalent circuit description fm am fm am 11 25 12 13 15 14 16 17 18 20 19 gnd mute tune ind fm if in band select am if in fm/am fe ouit fe gnd fm rf in fm rf am rf in 0 0 0 0 0.05 0.01 0.05 0.01 1.6 1.6 4.5 4.5 1.35 0 1.35 0 0 0 0 0 0.57 0.2 0.8 0.2 0 0 0 0 0.3 0 0.3 0 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1 1 2 5 1 2 3 3 c 3 k 1 3 1 5 1 k 2 k 1 4 a m b l o c k f m b l o c k 2 2 0 1 6 3 p 1 k 1 7 1 8 2 0 f e r e g g n d 1 9 gnd of fm/am if and det stage time constant for muting provided fm/am tuning indicator drive circuit fm if input pin fm/am band switching pin : am at gnd and fm at open am if input pin am/fm if output pin to connect with if filter gnd of fm/am front end fm rf amplifier circuit for fm rf input fm rf amplifier circuit to connect to rf tank circuit am rf input to connect to bar antenna
4 cxa1538m/n/s pin voltage (v) no. symbol v cc =3 v v cc =6 v equivalent circuit description fm am fm am 21 23 22 24 26 27 28 30 reg afc fm osc am osc fm discri vco mpx reg gnd 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 2.30 2.70 3.60 4.00 1.65 1.65 1.65 1.65 0 0 0 0 1 . 2 5 v r e g 2 1 2 3 r e g 2 2 r e g 2 4 2 6 1 k m p x r e g 2 7 2 8 3 0 regulator output variable capacitance for afc fm local oscillation circuit am local oscillation circuit phase shift circuit to connect to ceramic discriminator vco control pin for stereo demodulation regulator for mpx gnd of mpx block
5 cxa1538m/n/s item circuit current (1) circuit current (2) separation fm mute stereo indicator output fm front end voltage gain (1) fm detection (mono/stereo) output level l, r fm-if knee level fm-if distortion l, r (mono) fm-if distortion l, r (stereo) fm-if center frequency deviation fm meter current (1) m/st switching level by if input auto blend am front end voltage gain (2) am-if voltage gain (4) am detection output level (l, r) am meter current (2) am detection output distortion (l, r) symbol id 1 id 2 sep a 1 is gv 1 vd 1 vd 2 thd 1 ? f 1 ib 1 vi 1 vi 2 gv 2 gv 3 vd 3 ib 2 thd 2 sw condition 1 2 3 4 5 6 8 9 10 a a a b a b off a off a a b / b b on a a / off off a a / b b a a / b a b b a b a a / b a a test point i d i d v d v d is v a v d v in3 vd v f i b is v in3 v b v in4 v d i b v d output waveform and test method am no signal fm no signal separation when v in3 = 50 db v, 10.7 mhz, 1 khz, 22.5 khz dev input attenuation of noise level when v in3 =no signal, s 8 on/off v in3 =60 db v, 10.7 mhz cw pilot on v in1 =40 db v, 100 mhz cw v a =10.7 mhz cw v in3 =90 db v, 10.7 mhz 1 khz 22.5 khz dev v d =1 khz sine wave v in3 =90 db v, 10.7 mhz input level at C3 db of 1 khz 22.5 khz dev output v in3 =90 db v, 10.7 mhz 1 khz 75 khz dev v d =1 khz sine wave v in3 =90 db v, 10.7 mhz cw v in3 =60 db v, 10.7 mhz cw v in3 =10.7 mhz v in2 =60 db v, 1660 khz cw v b =455 khz cw v in4 level at output of 15.5 mvrms v in4 =85 db v 455 khz (1 khz 30 % mod) v d =1 khz sine wave v in4 =85 db v, 455 khz cw v in2 =95 db v, 1660 khz (1 khz 30 % mod) v d =1 khz sine wave electrical characteristics (ta=25 c, v cc =6 v) min. typ. max. unit 5.0 8.5 12.0 ma 7.0 11.0 15.0 ma 30 40 db 16 23 30 db 1.8 3.0 5.0 ma 28 35 42 db 35.0 77.5 138 mvrms 25 31 db v 0.1 2.0 % 0.1 2.0 % C50 0 +50 khz 1.8 3.5 7.0 ma m ? st 43 48 db v 38 st ? m 41 46 db v 35 1 10 41 db 19 24 28 db 15 21 29 db v 35.0 77.5 138 mvrms 1.3 3.0 7.0 ma 0.6 2.0 % v 1 to v 5 input short 0 db v=1 v
6 cxa1538m/n/s electrical characteristics test circuit g n d p l l l p f m p x r e g v c o f m d i s c r i m u t e a m o s c a f c f m o s c r e g f m r f a m r f i n f m r f i n f e g n d f m / a m f e o u t p l l l p f p i l o t d e t l p f 1 p i l o t d e t l p f 2 s t i n d v c o c h e c k r c h o u t l c h o u t v c c r i p p l e f i l t e r a g c / a f c 1 a g c / a f c 2 g n d t u n e i n d f m i f i n a m i f i n b a n d s e l e c t v f v o v m v h i d v d i b i s 0 . 0 1 0 . 0 1 0 . 0 1 0 . 4 7 4 . 7 4 . 7 1 3 3 1 0 0 0 . 0 1 s 4 s 3 a a b a a b a b b b s 5 2 k v i n 4 a m 4 5 5 k h z v i n 3 f m 1 0 . 7 m h z 7 . 5 k 7 . 5 k s 2 s 1 s 1 0 7 . 5 k 3 0 k 1 5 k h z l p f 1 9 k h z n o t c h f i l t e r 2 . 2 k 1 0 5 k s 9 1 0 0 c f 1 s 8 2 0 p 2 k 3 . 3 1 0 p 1 0 0 k 1 5 p 1 0 p 3 0 p 1 0 p 1 0 p 4 3 p 1 5 0 1 0 0 v i n 2 a m 1 6 6 0 k h z v i n 1 f m 1 0 0 m h z 2 5 1 8 p 2 2 0 0 p 1 0 p 0 . 0 1 f 2 k s 6 3 3 0 v a 3 0 p 0 . 0 1 1 5 0 h 1 v s 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 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0
7 cxa1538m/n/s application circuit note) this circuit is an application example and is not guaranteed for all applications. for c, r (c13, c14, r6, r7) marked * , refer to 2. mpx circuit of notes on usage. c 9 1 0 c f 3 r v 2 2 k r 3 1 0 k c 8 3 . 3 r 4 2 . 2 k c 1 1 4 . 7 c 1 0 0 . 4 7 g n d p l l l p f m p x r e g v c o f m d i s c r i m u t e a m o s c a f c f m o s c r e g f m r f p l l l p f p i l o t d e t l p f 1 p i l o t d e t l p f 2 s t i n d / v c o c h e c k r c h o u t l c h o u t v c c r i p p l e f i l t e r a g c / a f c 1 a g c / a f c 2 g n d t u n e i n d f m i f i n a m i f i n b a n d s e l e c t a m r f i n f m r f i n g n d f m / a m f e o u t c 1 2 1 r c h o u t l c h o u t * c 1 3 0 . 0 2 2 * c 1 4 0 . 0 2 2 c 1 5 1 0 0 c 1 6 3 3 c 1 7 1 c 1 8 4 . 7 r 1 0 3 3 0 r 1 1 0 0 k c 1 9 0 . 0 1 c 2 0 0 . 0 1 * r 6 3 . 3 k * r 7 3 . 3 k v c c = 3 v r 5 2 . 2 k r 8 2 . 2 k s 1 i f t c f 1 r 2 2 . 2 k b p f c 4 4 p f l 4 l 3 c 3 1 8 p c 2 2 . 0 p c 7 3 p c 1 7 p l 2 l 1 c 6 1 0 c 5 0 . 0 0 1 c f 2 b p f c f 1 c f 2 c f 3 i f t : f m b a n d p a s s f i l t e r : a m 4 5 5 k h z c f : f m 1 0 . 7 m h z c f : f m d i s c r i m i n a t o r : a m 4 5 5 k h z i f t r 9 1 0 0 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 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 c a p a c i t o r u n i t : f 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 .
8 cxa1538m/n/s i n p u t s i g n a l l e v e l ( d b v ) s e p a r a t i o n / r e s p o n s e ( d b ) d i s t o r t i o n t h d 1 ( % ) i n p u t s i g n a l l e v e l ( d b m ) r e s p o n s e ( d b ) d i s t o r t i o n t h d 2 ( % ) 0 1 0 2 0 3 0 4 0 5 0 6 0 0 1 0 2 0 3 0 4 0 5 0 6 0 5 4 3 2 1 5 4 3 2 1 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 f m i / o c h a r a c t e r i s t i c s a m i / o c h a r a c t e r i s t i c s s i g n a l ( s t e r e o ) s i g n a l ( m o n o ) v c c f r e o m o d e d e v 3 v 9 8 m h z 4 0 0 h z 2 2 . 5 k h z v c c f r e o m o d 3 v 1 0 0 0 k h z 4 0 0 h z , 3 0 % s e p a r a t i o n l ? r r ? l n o i s e ( s t e r e o ) ( w i t h l p f ) n o i s e ( m o n o ) d i s t o r t i o n ( m o n o ) s i g n a l d i s t o r t i o n n o i s e 7 3 7 4 7 5 7 6 7 7 7 8 7 9 4 5 4 0 v c o - f r e e - r u n n i n g f r e q u e n c y ( k h z ) v c o - f r e e - r u n n i n g f r e q u e n c y ( k h z ) s e p a r a t i o n ( d b ) 0 2 0 4 0 6 0 8 0 7 9 7 8 7 7 7 6 7 5 t a - a m b i e n t t e m p e r a r u r e ( c ) v i n 3 = 9 0 d b v 1 0 . 7 m h z f m o d = 1 k h z 2 2 . 5 k h z d e v p i l o t o n v i n 3 = 9 0 d b v 1 0 . 7 m h z c w
9 cxa1538m/n/s coil data am osc core diameter ? 0.06 mm 2 uew equivalent to l-5k7h5 r12-1684x, mitsumi electric co., ltd. or 7trs-8441 toko co., ltd. f (khz) 796 l ( h) 1 to 3 270 q o 1 to 3 125 1 to 3 107 4 to 6 29 s 1 2 3 4 5 6 f 5 m m f 6 m m 3 . 5 t number of widings (t) am bar antenna f (khz) 796 l ( h) 650 primary 91 t secondary 20 t p r i m a r y s e c o n d a r y fm rf am ift core diameter ? 0.07 mm uew equivalent to 21k7h5 r12-8558a, mitsumi electric co., ltd. or 7mc-7789n toko co., ltd. c o (pf) 1 to 3 180 q o 1 to 3 90 1 to 2 111 2 to 3 35 4 to 6 7 s 1 2 3 4 5 6 f 4 m m f 0 . 6 m m 3 . 5 t number of widings (t) fm discriminator core diameter ? 0.1 mm 2 uew equivalent to 119asc-12200z, toko co., ltd. c o (pf) 1 to 3 82 q o 1 to 3 95 1 to 3 111 1 2 3 4 5 6 number of widings (t) fm osc pfwe8 bpf (88 to 108 mhz) soshin electric co., ltd. cf1 sfu-455b murata mfg. co., ltd. or bfcfl-455 toko co., ltd. cf2 sfe10.7ma5 murata mfg. co., ltd. cf3 cda10.7mg1 murata mfg. co., ltd. vc pvc2lxt16l mitsumi electric co., ltd. vc (rear mount) hu22124n700 toko co., ltd. pvc2lxt16b mitsumi electric co., ltd.
10 cxa1538m/n/s notes on usage 1. vco free run frequency adjustment method as this ic has built-in oscillation capacitance, the oscillation frequency can be controlled with an external resistor. 1) vco adjustment method pin 4 is the stereo indicator and vco check pin. therefore, in stereo mode (when stereo indicator drive tr q2 is switched on), pin 4 voltage lowers down, q1 is cut off and vco oscillation waveform can not be seen. in am mode as well, the oscillation waveform can not be seen as vco turns off. adjust the free run frequency at 76 khz 50 hz. in this ic, tuner and mpx sections are directly connected. therefore, free run frequency is not stable, being affected by noise except in reception mode. for free run adjustment, input signals from either rf or if. (input signal should be rf [tuning frequency] or fo of the discriminator using if (10.7 mhz) and input more than 60 db .) 2) how to deal with pin 4 after adjustment. with the use of a stereo indicator. when v cc is 3 v or more, insert a bypass resistance r to prevent led malfunction. without the use of a stereo indicator. turn pin 4 to open or connect to gnd. 3) control resistor of vco oscillation frequency for the vco control resistor of this ic, a carbon film resistor suffices. for easier adjustment of temperature characteristics and vco free run frequency, the following combination is recommended. 2 7 2 8 1 0 k 2 2 k c a p a c i t o r f o r d e c o u p l i n g q 1 q 2 3 3 k v c c a b o u t 1 8 0 m v p - p 4 2 . 2 k v c c = 3 v 4 o p e n 4 4 2 7 2 8 1 0 k 2 2 k 2 . 2 k r v c c > 3 v 4
11 cxa1538m/n/s 2. mpx circuit 1) mpx load resistance when power supply voltage is over 3 v, change the mpx load resistor r6, r7 from 3.3 k to 6.8 k . in this case, the output level is increased by about 6 db. 2) time constant of de-emphasis refer to the following table as the time constant is determined at c13, c14, r6 and r7. 3. afc circuit 1) this ic has a built-in variable capacitances. change to the following circuit when designing j band, because the standard circuit is for w band. 2) afc pull-in range is expanded by increasing the capacitance of standard circuit c7 3 pf. adjust the value of capacitance according to the set specification. 4. auto blend circuit this ic has a built-in auto blend circuit and a mono switch is not required as a rule. this circuit controls the separation in proportion to the signal level and reduces noise automatically for stereo reception below the mid electric field when the electric field strength reaches lower than about 40 db . when the electric field strength turns below 10 to 15 db , mono operation is automatically activated. to switch mono mode on externally, ground pin 3 with 33 k . 50 s 75 s 3.3 k 0.015 f 0.022 f 6.8 k 0.0082 f 0.012 f r6, r7 c13, c14 3 p f 1 1 4 . 7 1 5 0 k 9 1 0 2 2 2 3 3 3 k m o n o s w 2 3
12 cxa1538m/n/s 5. fm discriminator for fm detection, the quadrature detection system is adopted. as a phase shifter, a ceramic resonator (cf 3 discriminator) applies to achieve adjustment-free detection. though the sensitivity and selectability will be slightly affected, the discriminator can be replaced by a coil as shown below. combining cf2 (fmif) and cf3 (pm discriminator) poses problems with the distortion factor when deviation with the if band central frequency fo occurs. to this effect, use pairs of the same rank as indicated in the chart. 6. fm muting circuit this ic has a built-in soft muting circuit. as shown in the following i/o characteristics diagram, 23 db (typ.) muting is applied and noise level reduced during weak electric field and out of tune instances. 7. notes on patterns 1) positions of fm ant and osc coils locate those at right angles to each others to avoid inductance m through coupling. further, insert a pin 21 pattern between patterns of pins 22, 20 and coils. 2) tuning circuit as the capacitances c1 to c4, l2 and l3 are the constants on the standard circuit board, check the constants when a new circuit board is used. 3) grounding pins pin 17 is a grounding pin for am, fm and fe ; pin 11 for if ; and pin 30 for mpx. use as thick as possible a pattern since the grounding between ant in, bpf and pin 17 significantly stability, nf and characteristics affects. 4) ground bypass capacitors c5 (0.001 f) and c6 (10 f) connected to pin 21 as close as possible to pin 17. a red b blue c orange d black e white f o of cf2 and cf3 10.70 mhz 10.67 mhz 10.73 mhz 10.64 mhz 10.76 mhz 2 2 p f d i s c r i c o i l 2 6 c o n v e n t i o n a l i c i c w i t h b u i l t - i n s o f t m u t e s + n n i n p u t l e v e l ( d b ) r e s p o n s e ( d b ) 3 2 3 a n t i n 1 6 1 8 b p f 1 7
13 cxa1538m/n/s cxa1538m CXA1538S
package outline unit : mm cxa1538m cxa1538n cxa1538m/n/s 14 0 . 4 5 0 . 1 1 1 . 2 7 1 5 7 . 6 0 . 1 + 0 . 3 1 0 . 3 0 . 4 1 6 3 0 1 8 . 8 0 . 1 + 0 . 4 0 . 2 m 0 . 1 0 . 2 0 . 0 5 + 0 . 1 0 . 5 0 . 2 0 . 1 0 . 0 5 a ( 9 . 3 ) 2 . 3 0 . 1 5 + 0 . 4 3 0 p i n 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 s o p - 3 0 p - l 0 3 s o p 0 3 0 - p - 0 3 7 5 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 l a t i n g 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 0 . 7 g 0 t o 1 0 + 0 . 2 d e t a i l a 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 3 0 p i n s s o p ( p l a s t i c ) * 9 . 7 0 . 1 * 5 . 6 0 . 1 0 . 6 5 0 . 2 2 0 . 0 5 3 0 1 1 5 1 6 1 . 2 5 + 0 . 2 0 . 1 7 . 6 0 . 2 0 . 1 5 + 0 . 0 5 0 . 0 2 0 . 1 0 . 1 0 . 5 0 . 2 0 t o 1 0 a d e t a i l a s s o p - 3 0 p - l 0 1 s s o p 0 3 0 - p - 0 0 5 6 0 . 1 g 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 . p l a t i n g 0 . 1 0 0 . 1 3 m + 0 . 1 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 ) .
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 3 0 p i n s d i p ( p l a s t i c ) 2 6 . 9 0 . 1 + 0 . 4 1 5 1 6 3 0 1 . 7 7 8 1 0 . 1 6 8 . 5 0 . 1 + 0 . 3 0 . 2 5 0 . 0 5 + 0 . 1 0 t o 1 5 0 . 5 0 . 1 0 . 9 0 . 1 5 3 . 0 m i n 0 . 5 m i n 3 . 7 0 . 1 + 0 . 4 s d i p - 3 0 p - 0 1 s d i p 0 3 0 - p - 0 4 0 0 1 p a c k a g e s t r u c t u r e m o l d i n g c o m p o u n d 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 p l a t i n g c o p p e r a l l o y 1 . 8 g s o l d e r / p a l l a d i u m 1 . a l l m a t s u r f a c e t y p e . t w o k i n d s o f p a c k a g e s u r f a c e : 2 . a l l m i r r o r s u r f a c e t y p e . CXA1538S cxa1538m/n/s 15 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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