orderin g numbe r : en5688c monolithic linear ic for home stereo ic with electronic tuning support single-chip ic LA1837 overview the LA1837 is a single-chip am/fm if and mpx ic that supports electronic tuning and was developed for use in home stereo systems. it is optimal for use in automatic station selection systems that use the sd and if counting techniques. features ? on-chip mpx vco (no external components required). ? adjacent channel interference rejectio n function (third and fifth order). ? supports both the sd and the if counting techniques. ? the am and fm sd sensitivities can be set independently. ? the am and fm output levels can be set independently. ? improved am practical sensitivity and high-input distortion characteristics. functions ? am : rf amplifier, mixer, oscillator, if amplifier, de tector agc, oscillator buffer, s-meter, narrowband sd, if buffer ? fm-if : if amplifier, quadrature detector, s-meter, scurve detector, if buffer output ? mpx : pll stereo decoder, stereo display, forced mono, vco stop, post amplifier, au dio muting, adjacent channel interference rejection function specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max 12 v allowable power dissipation pd max ta 70 c 550 mw operating temperature topr -20 to +70 c storage temperature tstg -40 to +125 c specifications of any and all sanyo semiconductor co.,l td. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer ' s products or equipment. to verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' sproductsor equipment. any and all sanyo semiconductor co.,ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, av equipment, communication device, office equipment, industrial equ ipment etc.). the products mentioned herein shall not be intended for use for any "special application" (medica l equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, t ransportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of re liability and can directly threaten human lives in case of failure or malfunction of the product or may cause har m to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for app lications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. if there is n o consultation or inquiry before the intended use, our customer shall be solely responsible for the use. 70109 sy / 62409 ms pc/82097ha(ot) no.5688-1/9
LA1837 no.5688-2/9 operating conditions at ta = 25 c parameter symbol conditions ratings unit recommended supply voltage v cc 9 v operating supply voltage range v cc op 7 to 11 v electrical characteristics at ta = 25c, v cc = 9v, in the specified test circuit ratings parameter symbol conditions min typ max unit fm mono characteristics fc = 10.7mhz, fm = 1khz, with the coil adjusted so that v afc - v reg = 0v current drain i cco-fm with no input 18 31 44 ma demodulation output v ofm 100db , 100% mod. the pin 16 output 730 1100 1460 mvrms channel balance c.b-mono 100db , 100% mod. the pin 16 output/pin 17 output -1.5 0 +1.5 db thd fm(1) 100db , 100% mod. the pin 16 output 0.3 1.3 % total harmonic distortion (mono) thd fm(2) 100db , 100% mod. the pin 16 output 1.0 5 % signal-to-noise ratio s/n fm 100db , 100% mod. the pin 16 output 72 80 db am rejection ratio amr 100db , 100% mod. the pin 16 output 45 65 db limiting input voltage -3dbl.s. 100db , 100% mod. referenced to the output. the input such that the output is down ?3 db. 26 32 38 db led sensitivity sd on-fm 51 60 69 db led bandwidth sd bw 100db 85 120 170 khz if count buffer output v ifbuff-fm 100db , the pin 13 output 80 120 160 mvrms v sm-fm(1) 0db , the pin 11 output 0 0.1 0.5 v s-meter output v sm-fm(2) 100db , the pin 11 output 3.6 4.3 5.0 v muting attenuation mute-att 100db , 100% mod. the pin 16 output 75 85 db fm stereo characteristics fc = 10.7mhz, 100db , fm = 1khz, l + r = 90%, pilot = 10% separation (left) sep l l mod. the pin 16 output/pin 17 output 30 45 db separation (right) sep r r mod. the pin 17 output/pin 16 output 30 45 db stereo on level st on the pilot modulation such that v7 is under 0.7v. 1.3 2.7 5 % stereo off level st off the pilot modulation such t hat v7 is over 4.5v. 1.5 % total harmonic distortion (main) thd-main l + r mod. the pin 16 output 0.3 1.3 % brej-3rd fs = 113khz, v s = 90%, pilot = 10%, the pin 16 output vs. the l-r mod. 1khz demodulated output 40 db adjacent channel interference rejection ratio brej-5th fs = 189khz, v s = 90%, pilot = 10%, the pin 16 output vs. the l-r mod. 1khz demodulated output 40 db am characteristics fc = 1000khz, fm = 1khz current drain i cco-am with no input 15 25 35 ma v oam(1) 23db , 30% mod. the pin 16 output 100 180 360 mvrms detector output v oam(2) 80db , 30% mod. the pin 16 output 200 320 500 mvrms s/n am(1) 23db , 30% mod. the pin 16 output 18 22 db signal-to-noise ratio s/n am(2) 80db , 30% mod. the pin 16 output 49 55 db thd am(1) 80db , 30% mod. the pin 16 output 0.4 1.2 % total harmonic distortion (mono) thd am(2) 80db , 80% mod. the pin 16 output 1.0 4.0 % led sensitivity sd on-am 17 27 37 db local oscillator buffer output v osc-am with no input. the pin 30 output 110 160 220 mvrms if counter buffer output v ifbuff-am 80db , no modulation. the pin 13 output 160 220 300 mvrms st-if output v stif-am 80db , no modulation. the pin 7 output 16 34 48 mvrms s-merer output v sm-am 0db , no modulation. 0 0 0.2 v
LA1837 package dimensions unit : mm (typ) 3196a pd max ? ta 0 300 400 500 550 200 100 600 --40 --20 80 20 40 60 0 100 ambient temperature, ta -- c allowable power dissipation, pd max -- mw sanyo : dip30sd(400mil) (1.04) 1.78 0.95 0.48 10.16 3.95 ma x (3.25) 0.51 min 3.0 0.25 11 5 30 16 8.6 27.0 block diagram tu-led fm ift osc buff fm sd band-w osc rf am agc vt 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 fm sd adj + + + + + l.p.f l.p.f + am-stereo l/r-input l l-out r-out r st + + fm am mute am/fm if-buff mono top view v cc + + + am v sm (sd-adj) fm v sm am narrow sd v cc gnd am-if st-led fm in (10.7mhz) buff alc reg am osc fm det sd comp fm s-meter am s-meter tuning drive stereo drive stereo sw am / fm if-buff s-curve am rf.amp am mix agc am if am if det decoder anti-birdie 3 rd 5 th p-det ? no.5688-3/9
LA1837 test circuit LA1837 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 1000pf 39pf 5.1k 50 osc buff (1.45mhz) 20pf osc t1 reg afc + 0.047 f 33 f am-in (1mhz) 0.047f 39mh 10 k 0.047f + + 3.3 f 22f 10 f 0.47f 1f 0.033 f 910pf 0.01f 10f 18k + 0.033 f l.p.f 3.3k + 10 f 1f 3.3k 5k mono am if-buff fm + l.p.f l-out r-out + stereo 5k 3k 5k ++ 10k 1f 0.047f 0.047f 0.047f 47f 0.047f 0.047f 100 f 4.7k 68k seek1000pf v cc 9.0v v dd normal + 51 am v sm fm v sm 100 1000pf () t3 68k + st am-st sd t2 450khz + fm in (10.7mhz) 300 75 top view pin functions pin no. pin function pin voltage (v) pin description equivalent circuit 1 fm if input vreg input impedance r i = 330 1 3 2 am mixer output v cc connect the mixer coil between this pin and v cc . 2 3 fm if input bypass vreg also functions as the mpx regulator filter. see pin 1. 4 am if input vreg input impedance r i = 2k 4 5 gnd 0v 6 7 tu-led st-led am-if output v cc v cc active low open collector output am stereo if output (pin 7) the current input must not exceed 150 a. 6 7 8 v cc v cc 9 fm detector v cc recommended detector coil : 600beas-9715z (the toko electric corporation) 9 10 am narrow band cf connection 1.3v recommended narrow band cf: bfu450 c4n (murata mfg. co., ltd.) if the narrow band sd is not used, bypass this circuit with a 50 resistor and a 0.047 f capacitor connected in series. 10 continued on next page. no.5688-4/9
LA1837 continued from preceding page. pin no. pin function pin voltage (v) pin description equivalent circuit 11 fm-s-meter output 0v r l = 8k 11 12 am s-meter output am sd sensitivity adjustment 0v (am) the am sd sensitivity is adjusted with the value of the external resistor connected between this pin and ground. 12 28 13 am and fm if buffer output, output control switch (mute switch) 0v v13 0.5 v : reception state 1.4 v v13 2.2 v : if buffer output turned on v13 3.5 v : if buffer output and muting are turned on 13 14 phase comparator low-pass filter (fm/am switching) v cc -1.4 (fm) 0v (am) connecting this pin to ground through a resistor sets the ic to am mode. resistor value limits : 2.7k (when v cc = 7v) 3.9k (8v) 5.1k (9v) 6.2k (10v) 7.5k (11v) 14 15 pilot detector low-pass filter (forced mono) (vco stop) v cc -1.0 if a current of 50 a or greater flows from this pin, the system is forced to mono. connecting this pin to ground stops the vco. the resistor limit values are the same as for pin 14. 15 16 17 18 19 post amplifier input and output vreg vreg output impedance r o = 200 pin 16 : right output, pin 17 : left output inverting inputs pin 18 : right input, pin 19 : left input r nf = 33k 16 17 18 19 20 21 mox output 3.5v 3.5v output impedance r o = 3.3k pin 20 : right de-emphasis pin 21 : left de-emphasis 20 21 22 mpx input 2.9v input impedance r i = 20k 22 23 fm demodulator output 2.8v (fm) 2.8v (am) output impedance r o = 3.0k the separation can be modified by inserting a capacitor between this pin and ground. set v o sub/v o main to be about 0 db. 23 24 am detector output 0v (fm) 0.5v (am) output impedance r o = 3.3k the am frequency characteristics can be modified by adjusting the time constants of the circuits between this pin and pin 22, and between this pin and ground. 24 25 am agc 0v (fm) 0.5v (am) the built-in load resistor r = 11k . 25 continued on next page. no.5688-5/9
LA1837 continued from preceding page. pin no. pin function pin voltage (v) pin description equivalent circuit 26 afc vreg the fm sd bandwidth can be modified with the external resistor connected between this pin and pin 28. 26 27 am rf input vreg use this pin at the same potential as pin 28. 27 28 reg vreg vreg = 3.6v 28 29 osc vreg use an oscillator coil between this pin and pin 28. 29 30 oscillator buffer output, fm sd sensitivity adjustment 1.6v (fm) 1.3v (am) the fm sd sensitivity can be modified with the external resistor connected between this pin and ground. output impedance r o = 20 30 coil specifications (bottom view) ?am oscillator (for the dut) hw-50425 (mitsumi electric co., ltd.) 3-2 2t 4-6 9t 2-1 86t qo 80 l = 270 h ?ift yd-1073-1 (mitsumi electric co., ltd.) 1-2 58t 4-6 7t 2-3 94t fo = 450khz qo = 110 includes an internal 180pf capacitor. sfu450b included. ?fm detector 600beas-9715z (the toko electric corporation) 3-1 22t f = 10.7mhz qo = 40 includes an internal 82pf capacitor. 4 6 no.5688-6/9 2 3 1 yd-1073 sfu450 s b s 2 3 1 4 6 2 3 1 4 6 s
LA1837 12 30 0 5.0 10 10.60 10.62 10.64 10.66 10.68 10.70 10.72 10.74 10.76 10.78 2 10 20 30 40 357 0.1 23 57 1.0 22 357 10 10.80 0.01 3 2 3 5 7 0.1 2 3 5 7 2 3 5 7 1.0 --80 --70 --60 --50 --40 --30 --20 --10 0 overall fm characteristics --90 1.0 2.0 3.0 4.0 0.01 10 0 10 20 30 40 50 60 70 80 90 100 110 50 60 70 80 90 100 110 120 input -- db fm thd/v sm characteristics distortion vs. frequency characteristics 0 1 2 3 4 5 0 120 input -- db total harmonic distortion, thd -- % s-meter output, v sm -- v frequency, freq -- khz total harmonic distortion, thd -- % frequency fc -- mhz fm thd band characteristics v cc = 9v fc = 10.7mhz fm = 1khz, 75khzdev out v sm dbm no.5688-7/9 output - - am out noise v cc = 9v fc = 10.7mhz fm = 1khz, 75khzdev thd v in = 100db fm = 1khz, 75khzdev sub % to tal harmonic distortion, thd - - main am mono st 0 5 10 15 20 25 30 35 40 45 50 --90 --80 --70 --60 --50 --40 --30 --20 --10 0 0.01 0.1 23 57 1.0 23 57 10 2 3 5 7 90 110 130 150 170 190 210 2 frequency, freq -- khz -- 6 -- 4 -- 2 0 2 4 6 0 10 20 30 40 50 60 70 80 90 10 20 30 2 12 14 46810 40 pilot -- mv 01 6 rsdadj -- k sd on -- db 70 230 frequency, fs -- khz vobat -- db separation vs. frequency characteristics adjacent channel interference rejection ratio capture range characteristics sd sensitivity adjustment characteristics separation, sep - - db capture range - - % if = 10.7mhz, 100db, 75khzdev v s = 90% pilot = 10% referenced to the l-r demodulated output. sep-r sep-l la1836 LA1837 c r + c r - fm am fm am
LA1837 28 26 24 22 c r 24 22 0.01f r 0 5.0 0 --20 0 20 40 60 80 100 120 2 02040 357 0.1 23 57 1.0 23 57 10 140 0.01 2 --35 --30 --25 --20 --15 --10 -- 5 100 200 300 400 500 600 sd sensitivity adjustment characteristics 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 --40 700 0 2 4 6 8 10 12 14 16 18 60 80 100 120 20 radj -- k no.5688-8/9 sd bw -- khz overall am characteristics am detector output frequency characteristics (1) --80 --70 --60 --50 --40 --30 --20 --10 0 --20 140 input -- db output -- dbm frequency, fm -- khz output voltage, v o -- dbv input -- db s-meter output, v sm -- v am thd / v sm characteristics v cc = 9v fc = 1mhz fm = 1khz, 30%mod s/n (80db) = 58db noise v cc = 9v, fc = 1mhz fm =1khz, 30%mod s/n (80db) = 58db % to tal harmonic distortion, thd - - v sm c = 0.022f c = 0.01f c = 0.047f thd = 80%mod thd = 30%mod out --40 --20 --25 --30 --35 --15 --10 -- 5 0 0.1 2 3 5 7 1.0 0.01 0.1 23 57 1.0 23 57 10 2 3 5 7 --20 0 20 40 60 80 2 frequency, fm -- khz 0 10 20 30 40 50 60 70 80 90 --40 --20 0 20 40 60 80 100 ambient temperature, ta -- c s/n -- db --40 100 ambient temperature, ta -- c total harmonic distortion, thd -- % output voltage, v o - - dbv am detector output frequency characteristics (2) distortion vs. ambient temperature characteristics separation vs. ambient temperature characteristics r = 10k r = 33k r = 18k thd sub thd mono thd st thd main s/n mono s/n stereo db sep-r separation, sep - - sep-l
LA1837 sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ra tings, operating condition ranges, or other parameters) listed in products specif ications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-qual ity high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. it is possible that these probabilistic failures or malfunction could give rise to acci dents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or e vents cannot occur. such measures include but are not limited to protective circuits and error prevention c ircuits for safe design, redundant design, and structural design. upon using the technical information or products descri bed herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable f or any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. information (including circuit diagr ams and circuit parameters) herein is for example only; it is not guaranteed for volume production. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equi pment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor c o.,ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities conc erned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any in formation storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. this catalog provides information as of july, 2009. specifications and informat ion herein are subject to change without notice. ps no.5688-9/9
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