92706 / o3105 ms ot b8-3807 no.8271-1/9 LA1837M overview the LA1837M is a single-chip am/fm tuner ic that provides am and fm if and multiplex decoding circuits for electronic tuning and was developed for use in home stereo systems. it provides both sd and if counting techniques for optimal implementation of automatic station selection. features ? on-chip mpx vco circuit (no external components required). ? adjacent channel interference rejection function (third order and fifth order). ? supports both the sd and if counting t echnique (built-in sd speedup function). ? the am and fm sd sensitivity can be set independently. ? the am and fm output levels can be set independently. ? improved basic fm reception performance. functions ? am: rf amplifier, mixer, oscillator, if amplifier, detector , agc, oscillator buffer, s-mete r, narrow band sd, if buffer ? fm if: if amplifier, quadrature detector, s-me ter, sd, s curve detection, if buffer output ? multiplex stereo decoding: pll stereo decoder, stereo indi cator, forced monaural, vco stop function, post amplifier, audio 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 *: mounting board: 114.3 76.1 1.6mm glass epoxy board ordering number : en8271 monolithic linear ic single-chip am/fm tuner ic for home stereo systems any and all sanyo semiconductor products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. consult with your sanyo semiconductor representative nearest you before using any sanyo semiconductor products described or contained herein in such applications. sanyo semiconductor assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all sanyo semiconductor products described or contained herein.
LA1837M no.8271-2/9 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 7.0 to 11.0 v electrical characteristics at ta = 25 c v cc = 9.0v, in the specified 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 no input 18 31 44 ma demodulator output v ofm 100db, 100% mod, pin 16 output 730 1100 1460 mvrms channel balance c.b-mono 100db, 100% mod, pin 16 output / pin 17 output -1.5 0 +1.5 db thd fm 1 100db, 100% mod, pin 16 output 0.3 1.3 % total harmonic distortion (mono) thd fm 2 100db, 200% mod, pin 16 output 1.0 5.0 % signal-to-noise ratio s/n fm 100db, 100% mod, pin 16 output 72 80 db am rejection ratio amr 100db, am 30% mod, pin 16 output 45 65 db input limiting voltage -3dbl.s referenced to 100db, 100% mod, the input for output is -3db down. 26 32 38 db led on sensitivity sd on-fm 51 60 69 db led on bandwidth sd bw 100db 85 120 170 khz if counter buffer output v ifbuff-fm 100db, pin 13 output 80 120 160 mvrms v sm fm 1 0db, pin 11 output 0 0.1 0.5 v s-meter output v sm fm 2 100db, pin 11 output 3.6 4.3 5.0 v muting attenuation mute alt 100db, 100% mod, the pin 16 output 75 85 db [fm stereo characterist ics] fc = 10.7mhz, 100db , fm = 1khz, l+r = 90%, pilot = 10% separation: l sepl lmod. pin 16 output / pin 17 output 30 45 db separation: r sepr rmod. pin 17 output / pin 16 output 30 45 db stereo on level st on the pilot mod such that v7 < 0.7v 1.3 2.7 5.0 % stereo off level st off the pilot mod such that v7 > 4.5v 1.5 % total harmonic distortion (main) thd main l+r mod. pin 16 output 0.3 1.3 % brej-3rd fs = 113khz, vs = 90%, pilot = 10% pin 16 output, versus l-r mod. 1khz demodulator output 40 db adjacent channel interference rejection ratio brej-5th fs = 189khz, vs = 90%, pilot = 10% pin 16 output, versus l-r mod. 1khz demodulator output 40 db [am characteristics] current drain ic co-am no input 15 25 35 ma v oam 1 23db, 30% mod, pin 16 output 100 180 360 mvrms output detector v oam 2 80db, 30% mod, pin 16 output 200 320 500 mvrms s/n am 1 23db, 30% mod, pin 16 output 18 22 db signal-to-noise ratio s/n am 2 80db, 30% mod, pin 16 output 49 55 db thd am 1 80db, 30% mod, pin 16 output 0.4 1.2 % total harmonic distortion thd am 2 80db, 80% mod, pin 16 output 1.0 4.0 % led-on sensitivity sd on-am 17 27 37 db oscillator buffer output v osc-am no input, pin 30 output 110 160 220 mvrms if counter buffer output v ifbuff-am 80db, non-mod, pin 13 output 160 220 300 mvrms st if output v stif-am 80db, non-mod, pin 7 output 16 34 48 mvrms s-meter output v sm-am 0db, non-mod 0 0 0.2 v
LA1837M no.8271-3/9 package dimensions unit : mm 3073c block diagram
LA1837M no.8271-4/9 coil specifications pin function pin no. pin pin voltage equivalent circuit pin function 1 fm if input vreg input impedance r i = 330 2 am mixer output v cc connect the mixer coil between this pin and v cc . 3 fm if input bypass vreg see pin 1 also used for the multiplex regulator filter 4 am if input vreg input impedance r i = 2 k 5 gnd 0v 6 7 tu-led, st-led, am - if output v cc v cc active low open collector am stereo if output (pin 7) this pin must be set up with an influx current under 150a. 8 v cc 9 fm detector v cc recommended detector coil 600beas-9715z (the toko electric corporation) continued on next page. ? am oscillator (for the dut) hw-50425 ( mitsumi electric co. , ltd. ) ? fm-det 600beas-9715z (toko electric corporation) ? ift yd-1073-1 ( mitsumi electric co. , ltd. )
LA1837M no.8271-5/9 continued from preceding page. pin no. pin pin voltage equivalent circuit pin function 10 am narrow band ceramic filter connection 1.3v recommended narrow band ceramic filter bfu450c4n (murata mfg. co., ltd.) when the narrow band sd function is not used, bypass this circuit by connecting a 50 resistor and a 0.047f capacitor in series. 11 fm s-meter output 0v r l = 8k 12 am s-meter output, am sd sensitivity adjustment 0v (am) the am sd sensitivity can be adjusted with an external resistor between this pin and ground. 13 am/fm if buffer output, output control switch (muting switch) 0v v13 0.5v: reception state 1.4v v13 2.2v: if buffer output on v13 3.5v: if buffer output and muting on 14 phase comparator low-pass filter (fm/am switching) v cc -1.4 (fm) 0v (am) the ic switches to am mode when this pin is connected to ground through a resistor. resistor value limits: 2.7k (when v cc = 7v) 3.9k (8v) 5.1k (9v) 6.2k (10v) 7.5k (11v) 15 pilot detector low-pass filter (forced monaural) (vco stop) v cc -1.0 when a current of over 50a is sourced by this pin, the ic switches to forced monaural mode. the vco is stopped if this pin is connected to ground. the resistor value limits are the same as for pin 14. 16 17 18 19 post amplifier i/o verg verg output impedance r o = 200 pin 16: right output, pin 17: left output inverting input pins pin 18: right input, pin 19: left input r n f = 33k 20 21 multiplex output 3.5v 3.5v output impedance r o = 3.3k pin 20: right channel deemphasis pin 21: left channel deemphasis 22 multiplex input 2.9v input impedance r i = 20k 23 fm demodulated output 2.8v (fm) 2.8v (am) output impedance r o = 3.0k the separation can be adjusted with an external capacitor connected between this pin and ground. the vosub/vomain ratio is set to be approximately 0db. continued on next page.
LA1837M no.8271-6/9 continued from preceding page. pin no. pin pin voltage equivalent circuit pin function 24 am detector output 0v (fm) 0.5v (am) output impedance r o = 3.3k the am frequency characteristics can be adjusted with an rc circuit connected between pin 22 and ground. 25 am agc 0v (fm) 0.5v (am) internal load resistance r = 11k 26 afc vreg the fm sd bandwidth can be adjusted with an external resistor connected between this pin and pin 28. 27 am rf input vreg this pin must be held at the same potential as pin 28 28 reg vreg vreg = 3.6v 29 osc vreg connect the oscillator coil between this pin and pin 28. 30 oscillator buffer output, fm sd sensitivity adjustment 1.6v (fm) 1.3v (am) the fm sd sensitivity can be adjusted with an external resistor connected between this pin and ground. output impedance r o = 20
LA1837M no.8271-7/9
LA1837M no.8271-8/9
LA1837M ps no.8271-9/9 test circuit specifications of any and all sanyo semiconductor 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's products or equipment. sanyo semiconductor co., ltd. strives to supply high-quality high-reliability products. however, any and all semiconductor products fail with some probability. it is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. when designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. in the event that any or all sanyo semiconductor products (including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned 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 information storage or retrieval system, or otherwise, without the prior written permission of sanyo semiconductor co., ltd. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equipment, refer to the "delivery specification" for the sanyo semiconductor product that you intend to use. information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. sanyo semiconductor believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. this catalog provides information as of october , 2005. specifications and information herein are subjec t to change without notice.
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