92706 / 91004 jo im no.7931-1/10 la1845nv the la1845nv is designed for use in mini systems and is a single-chip tuner ic that provides electronic tuning functions using sd/if-count technique. it incorporates a pilot canceler and an adjustment-free mux vco circuit, thus allows additional parts to be reduced. functions ? am : rf amplifier, mixer, oscillator, if amplifier, det ector, agc, sd, oscillator buffer, if buffer, stereo if output, agc time constant switch ? fm if : if amplifier, quadrature detector, s-meter, sd (signal detection), s-curve detection, if buffer output ? mpx : pll stereo decoder, stereo display, forced monaural, vco stop, audio muting, adjacent channel interference rejection function, pilot canceler features ? integrated mpx vco (ceramic resonators are no longer required.) ? built-in adjacent channel interference rejection function (114khz, 190khz) ? supports both sd and if-count techniques ? both fm sd sensitivity and bandwidth can be set ? pilot canceler built in. maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum power supply voltage v cc max 6v allowable power consumption pd max ta = 80c with board 114.3mm 76.1mm 1.6mm material : glass epoxy resin 360 mw operating temperature topr -20 to +80 c storage temperature tstg -40 to +125 c operating conditions at ta = 25 c parameter symbol conditions ratings unit recommended supply voltage v cc 5v operating supply voltage range v cc op ta = 80c 4.3 to 5.5 v ordering number : enn*7931 monolithic linear ic single-chip home stereo ic 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.
la1845nv no.7931-2/10 electrical characteristics ? operating characteristics at v cc = 8v, in the specified test circuit. fm mono characteristics at fc = 10.7mhz, vi = 100db , fm = 1khz, modulation = 75khz ratings parameter conditions min typ max unit current drain with no input signal 20 30 40 ma demodulator output 100db , 100% modulation, fm = 1khz 230 360 460 mvrms total harmonic distortion 100db , 100% modulation, fm = 1khz 0.35 1.5 % signal-to-noise ratio 100db , 100% modulation, fm = 1khz 73 80 db am rejection ratio 100db , am = 30% modulation, fm = 1khz 47 65 db 3db sensitivity 100db , 100% modulation, fm = 1khz output reference, -3db input 32 40 db sd sensitivity 0% modulation 38 47 56 db if counter buffer output 100db 200 275 400 mvrms mute attenuation 100db , 100% modulation, fm = 1khz 76 db fm stereo characteristics at fc = 10.7mhz, vi = 100db , l+r = 90%, pilot = 10%, fm = 1khz ratings parameter conditions min typ max unit separation l+r = 90%, pilot = 10%, fm = 1khz 30 42 db stereo on level pilot input 1.5 3.5 5.5 % total harmonic distortion pilot input 0.45 1.5 % adjacent channel rejection ratio 1 fs = 113khz, vs = 90%, pilot = 10% ; the left-right modulation, demodulated output 36 db adjacent channel rejection ratio 2 fs = 189khz, vs = 90%, pilot = 10% ; the left-right modulation, demodulated output 41 db carrier leak l+r = 90%, pilot = 10% reference, pilot = 10% output 38 44 db am characteristics at fc = 1000khz, vi = 80db , fm = 1khz, modulation = 30% ratings parameter conditions min typ max unit current drain with no input signal 13 27 39 ma detector output 1 23db , 30% modulation, fm = 1khz 40 80 160 mvrms detector output 2 80db , 30% modulation, fm = 1khz 90 160 230 mvrms signal-to-noise ratio 1 23db , 30% modulation, fm = 1khz 17 23 db signal-to-noise ratio 2 80db , 30% modulation, fm = 1khz 46 52 db total harmonic distortion 1 80db , 30% modulation, fm = 1khz 0.4 1.1 % total harmonic distortion 2 107db , 30% modulation, fm = 1khz 0.5 1.3 % sd sensitivity 0% modulation 11 20 29 db local oscillator buffer output with no input signal 100 140 200 mvrms if counter buffer output 23db 140 285 400 mvrms
la1845nv no.7931-3/10 package dimensions unit : mm 3175b pin description pin no. pin function pin voltage equivalent circuit notes 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 reg 2.1 vreg = 2.1v 4 am if input vreg input impedance r i = 2k ? 5 gnd 0v 6 7 tu-led st-led/af-if output v cc active low open collector 8 fm detector v cc the 600beas-10471 (toko mfg. co., ltd.) is recommended for detector coil. 9 v cc continued on next page. 1 3 2 3 4 6 7
la1845nv no.7931-4/10 continued from preceding page. pin no. pin function pin voltage equivalent circuit notes 10 am/fm if counter output, output control switch, mute switch 0v v 10 0.5v : reception state 1.4v v 10 2.2v : muting on v 10 3.5v : if counter output and muting on 11 phase comparator low-pass filter (am/fm switching) v cc -1.0 the device operates in am mode when a current of over 200 a flows from pin. 12. 12 pilot detector low- pass filter (forced mono) (vco stop) v cc -1.0 the device is forced to monaural when a current of over 50 a flows from this pin. the vco is stopped when a current of over 200 a flows from this pin. the limit values for the resistor are the same as those for pin 11. 13 14 l outputs r outputs 3.2v output impedance r o = 3.3k ? 15 pilot canceler output vreg 16 decoder input vreg inverting input pin rnf = 20k ? 17 pll input vreg input impedance r i = 20k ? 18 fm demodulator output vreg+0.7 output impedance r o = 2.3k ? the channel separation can be adjusted with an external capacitor connected between this pin and ground. continued on next page. 13 ( ) 14 16 rnf 15 3 17 18 10 11 12
la1845nv no.7931-5/10 continued from preceding page. pin no. pin function pin voltage equivalent circuit notes 19 am detector output 0v (fm) 1.5v (am) output impedance r o = 3.3k ? 20 s meter, am agc 0.2v (fm) 0.9v (am) the resistance of the built-in resistor r is 13.9k ? . the sd response during seek operation is determined with the external capacitor connected to this pin. 21 am rf input vreg must be used at the same potential as pin 22. 22 afc vreg the fm sd bandwidth can be adjusted with the external resistor connected between this pin and pin 3 (vreg). 23 osc v cc connect the oscillator coil between this pin and pin 9 (v cc ). note : impedance of the secondary oscillator coil must be 5k ? or higher. 24 oscillator buffer output, fm sd sensitivity adjustment v cc -1.4 the fm sd sensitivity can be adjusted with an external resistor connected to this pin. output impedance r = 200 ? note : resistance of the external resistor connected to the pin 24 must be 3.3k ? or higher. 23 r 24 20 r 19 21 22
la1845nv no.7931-6/10 equivalent circuit block diagram
la1845nv no.7931-7/10 test circuit 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 la1845nv osc buff 1000pf 6.8k ? 5.6k ? 39pf 20pf am-in (1mhz) 39mh 3.3 f 50 ? 22 f 0.047 f 20k ? 10 f 20k ? 4.7 f 1000pf 0.1 f 65k ? a lpf lpf l out r out 0db 0.0047 f 0.015 f 50k ? 50k ? 0.01 f 0.047 f 300 ? 75 ? fm-in (10.7mhz) 33 f 0.047 f hw6215 v-sd v-st tu-led st-led 1000pf am if 10k ? detector coil discriminato r normal 20pf fm am seek v cc 5.0v mono 1 f 1 f 3k ? 0.47 f am/fm if-buff 1000pf hw50425 a 0.015 f 0.047 f 600beas-10471 top view
la1845nv no.7931-8/10
la1845nv no.7931-9/10
la1845nv no.7931-10/10 ps 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 i nformation as of september, 2004. specificati ons and information her ein are subject to change without notice.
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