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ordering number : en4619b 32096ha (ot)/d2593ts (ot) no. 4619-1/32 overview the la1867m is a high-performance multifunction (fm- if, noise canceller, mpx and mrc) single-chip tuner ic for use in car radios. high-quality tuners with superlative cost-performance characteristics can be constructed easily using this ic. functions fm-if noise canceller mpx mrc (multipath noise reduction circuit) features forms a high-performance fm tuner when combined with the sanyo la1193 fm front-end ic. multiple functions, mrc circuit, dual diversity, and rds handling high performance, high sensitivity and high stability (excellent temperature characteristics) high audio quality and noise reduction according to the reception conditions. miniaturization of the required external capacitors (electrolytic capacitors no longer required) easy adjustment (the sd, muting and snc circuits are separated.) package dimensions unit: mm 3148-qip44ma sanyo: qip44ma [LA1867NM] LA1867NM sanyo electric co.,ltd. semiconductor bussiness headquarters tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110-8534 japan car radio single-chip tuner system monolithic linear ic specifications maximum ratings at ta = 25? operating conditions at ta = 25? parameter symbol conditions rating unit maximum supply voltage v cc max pins 4 and 31 9.2 v allowable power dissipation pdmax 740 mv operating temperature topr ?0 to +85 ? storage temperature tstg ?0 to +150 ? parameter symbol conditions rating unit recommended supply voltage v cc pins 4 and 31 8.0 v v cc st/sd pins 29 and 44 5.0 v operating supply voltage range v cc op 7.0 to 9.0 v
operating characteristics a t t a = 25 c, v cc = 8.5 v (note tha t these measur ements ar e made using the ic-51-044-464 ic soc k et man uf actur ed b y y amaic hi electr ic w or ks, ltd .) note: * unless otherwise specified, with an ihf-bpf/t200 inserted in the pin 7 and 8 mpx output circuit. no. 4619- 2 /32 LA1867NM parameter symbol conditions rating unit min typ max [fm block] quiescent current i cco-fm no input (i 4 + i 31 ) 40 55 70 ma demodulator output v o-fm 10.7 mhz, 100 db , 1 khz, 175 260 350 mvrms 100% mod, pin 7 output channel balance c b 10.7 mhz,100 db , 1 khz, 100% mod, the ?.0 0 +1.0 db ratio of pin 7 to pin 8, referenced to pin 7. total harmonic distortion thd- fmmono 10.7 mhz, 100 db , 1 khz, 0.2 1.0 % 100% mod, pin 7 signal-to-noise ratio (if) s/n- fm if 10.7 mhz,100 db , 1 khz, 73 80 db 100% mod, pin 7 am suppression ration (if) amrif 10.7 mhz,100 db 1 khz, fm = 1 khz, 57 70 db pin 7 when the am modulation is 30% att-1 10.7 mhz, 100 db , 1 k hz, the pin 7 20 25 30 db attenuation when v 22 goes from 0 to 1 v muting attenuation att-2 10.7 mhz, 100 db , 1 k hz, the pin 7 28 33 38 db attenuation when v 22 goes from 0 to 2 v channel separation separation 10.7 mhz, 100 db , l + r = 90%, 30 40 db pilot = 10%, the pin 7 output ratio stereo on level st- on the pilot modulation level such that v 44 1.5 2.9 5.0 % becomes less than 0.5 v * stereo off level st- off the pilot modulation level such that v 44 0.8 1.9 % becomes greater than 3.5 v * total harmonic distortion thd- mainl 10.7 mhz, 100 db , l + r = 90%, 0.3 1.0 % pilot = 10%, pin 7 10.7 mhz, 100 db , pilot = 10% , pilot cancellation p can pin 7 signal/pilot-level leakage, 20 35 db din-audio filter snc output voltage v osub 10.7 mhz, 100 db , l ?r = 90%, 3 10 mvrms pilot = 10%, v 13 = 0.1 v, pin 7 snc output attenuation att snc 10.7 mhz, 100 db , l ?r = 90%, 2 6 10 db pilot = 10%, v 13 = 3 v to 0.6 v, pin 7 att hcc-1 10.7 mhz, 100 db , 10 khz, l + r = 90 %, 2 6 10 db pilot = 10%, v 14 = 3 v to 0.6 v, pin 7 hcc output attenuation att hcc-2 10.7 mhz,100 db , 10 khz, l + r = 90 %, 6 10 14 db pilot = 10%, v 14 = 3 v to 0.1 v, pin 7 10.7 mhz, 100db , 100% mod, if input input limiting voltage vi-lim such that the input reference output is 33 42 51 db down by ? db, when the soft muting function is operating muting sensitivity vi-mute the if unmodulated input level when 32 40 48 db v 23 is 2 v. sd sensitivity sd sen the unmodulated if input such that the sd 64 74 84 db pin voltage (v29) becomes 3.5 v or higher. if counter buffer output v ifbuff-fm 10.7 mhz, 100 db , unmodulated, 160 230 320 mvrms the pin 19 output am output v o-am the pin 7 output in am mode (ac 2 = 234 330 466 mvrms 300 mv rms, 1 khz, the pin 20 input) continued on next page.
continued from preceding page. bloc k functions 1. fm-if if-limiter amplifier s-meter outputs (three systems) quadrature detector af preamplifier afc output muting circuit (band mute, weak input mute, soft mute) control pins (sd, muting attenuation, soft mute on level) sd output if counter buffer output s-meter output shifter 2. noise canceller built-in high-pass filter built-in low-pass filter delay circuit noise agc pilot signal compensation circuit noise reduction setting pin noise canceller off in am mode function high-pass filter ?c?control pin no. 4619- 3 /32 LA1867NM parameter symbol conditions rating unit min typ max [fm block] v smfm-1 no input, pin 32 dc output, 0.0 0.1 0.3 v non-mod, sw-2 open v smfm-2 50 db , pin 32 dc output, 1.0 2.1 3.3 v signal meter output non-mod, sw-2 open v smfm-3 70 db , pin 32 dc output, 2.3 3.5 5.3 v non-mod, sw-2 open v smfm-4 100 db , pin 32 dc output, 4.7 6.0 6.7 v non-mod, sw-2 open muting bandwidth bw-mute 100 db , the bandwidth when v 23 = 2 v, 110 190 290 khz non-mod muting drive output v mute-100 100 db , pin 23 dc output, non-mod 0.00 0.03 0.20 v [n.c block] noise canceller input (pin 20), pg1 f = 1 khz, 1 s, with a 100 mv p-o pulse t gate 1 input, the time for v 40 to become 1 v 35 55 75 s or higher gate time f = 1 khz, 1 s, with a 100 mv p-o pulse t gate 2 input, with the mrc pin 15 input = 1 khz, 10 25 40 s 30 mv rms with a 1 khz signal such that the noise noise sensitivity s n canceller operation is on, the 1 s pulse 50 75 mvp-o input level, measure pin 20. [multipath suppression circuit] mrc input (ac1) mrc output v mrc v 18 = 2 v, 1 khz, 5 mv rms, the pin 1.75 1.85 1.95 v 12 voltage when there is a pin 15 input mrc operating level mrc-on v 18 = 2 v, the pin 15 input level such 15 30 mvrms that v12 becomes 1.75 v
3. mpx nonadjusting vco (912 khz) level-following type pilot cancelation circuit snc fm hcc stereo/mono display output built-in anti-birdie stereo decoder automatic stereo/mono switching 4. mrc dc level shifter circuit noise amplifier noise detection circuit time constant control circuit bloc k features 1. fm-if the development of a high performance s-meter circuit has simplified all types of control. high linearity s-meter circuit (6-stage detection type) high quality s-meter (superlative temperature characteristics) high quality design design that emphasizes temperature characteristics s-meter, sd sensitivity, ? db l.s., etc. improved active characteristics muting circuit time constant control (since the attack and recovery time can be set independently, the audio quality under multipath conditions can be improved.) three built-in s-meter circuits soft mute/h cc time constants sd time constants application design is eased since these can all be set independently. snc time constants 2. noise canceller noise canceller error prevention when a narrow band (150 khz) ceramic filter is used a new noise canceller system was developed. reduced noise canceller errors during overmodulated signal reception. reduced noise canceller errors under continuous noise conditions. miniaturization of the required external capacitors no. 4619- 4 /32 LA1867NM
3. mpx miniaturization of the required external components (nonadjusting 912 khz vco) improved basic performance pilot cancelation level (30 db typ.) no variation in mono output level due to separation adjustment (subcarrier output level adjustment type separation adjustment) a new snc curve was developed. built-in anti-birdie filters (114 khz and 190 khz) improved high region separation characteristics improved stereo signal-to-noise ratio 4. mrc controls the snc and hcc circuit control signals by detecting the field strength (s-meter) and multipath noise. no. 4619- 5 /32 LA1867NM
t est cir cuit no. 4619- 6 /32 LA1867NM
bloc k dia gram and p eripheral cir cuits no. 4619- 7 /32 LA1867NM
pin functions fm-if block no. 4619- 8 /32 LA1867NM continued on next page. pin function equivalent internal circuit note 18 s-meter output for mrc and snc 32 s-meter output for muting drive and hcc 30 s-meter output for sd 28 s-meter output shift control pin 20 noise canceller input 21 fm detector output 30 fm sd adj constant current drive type the slope can be changed by changing the value of the s-meter output resistance. the field strength can be shifted in the positive or negative direction with an external resistor on pin 28 without changing the s-meter slope. noise canceller input the input impedance is 50 k . fm detector output low impedance in fm mode pin 30 the comparison voltage is determined by the external resistor. pin 30 is the s-meter output, and sd turns on when it exceeds the internal supply voltage. unit (resistance: , capacitance:f)
continued from preceding page. no. 4619- 9 /32 LA1867NM continued on next page. pin function equivalent internal circuit note 37 fm if in 36 if bypass 23 mute drive output 22 mute input 33 fm mute on adj limited amplifier input select the capacitor grounding point carefully. the muting time constants from the external cr circuit are determined as follows. attack time t a = r 1 c 2 release time t r = r 2 c 2 noise convergence adjustment divide the v 23 voltage by r 2 when there is no input at the antenna input, and input that voltage to pin 22. noise convergence will be maximum when v 22 = 2 v. the variation range is 5 to 35 db, taking the 1 khz 22.5 khz dev output as the reference. a muting off function the muting is turned off when pin 22 is shorted to ground. the muting on level is adjusted by changing the external resistance r. unit (resistance: , capacitance:f)
continued from preceding page. no. 4619- 10 /32 LA1867NM pin function equivalent internal circuit note 24 afc 25 qd out 26 qd in 27 v ref 29 sd pin 30 sd sensitivity adjustment pin 19 if counter buffer seek/stop switch r 1 is the resistor that determines the band muting bandwidth. increasing r 1 reduces the bandwidth. decreasing r 1 increases the bandwidth. null voltage when tuned, the voltage between pins 24 and 27 will be 0 v. v 24 ?v 27 = 0 v the band muting is turned on when | v 24 ?v 27 | 3 0.7 v. the sd output for the pin 30 sd. r determines the sd sensitivity. pin 23 is coupled to the muting drive output. sd operates when the switch is off. this pin is used for both the if counter buffer (ac output) and the seek/stop switch (dc input). it is not coupled to the sd output. the if buffer is turned on and off by the pin 19 dc bias level. pin 19: high ? buffer on, low ? buffer off. unit (resistance: , capacitance:f)
mpx block no. 4619- 11 /32 LA1867NM continued on next page. pin function equivalent internal circuit note 5 pilot detector 14 h cc control input pin 13 snc control input pin the ic is forced to mono if a 1 m resistor is inserted between pin 5 and v cc . h cc is off in am mode. controls the sub output with an input of between 0 and 1 v. unit (resistance: , capacitance:f)
continued from preceding page. no. 4619- 12 /32 LA1867NM continued on next page. pin function equivalent internal circuit note 10 phase comp. 11 9 separator adjustment pin 6 vco the sub decoder input level is adjusted with a trimmer. (the output level in mono and main modes does not change.) the oscillator frequency is 912 khz. unit (resistance: , capacitance:f)
continued from preceding page. no. 4619- 13 /32 LA1867NM pin function equivalent internal circuit note 3 pilot cancellation signal output 17 gnd 7 mpx out (left) 8 mpx out (right) pin 3 is the pilot cancellation signal output. gnd unit (resistance: , capacitance:f)
mpx block applications nc block no. 4619- 14 /32 LA1867NM continued on next page. pin function equivalent internal circuit note 43 pilot input 1 hcc capacitor pin 43 is the pll circuit signal input. the hcc frequency characteristics are determined by the capacitor connected at this pin. pin function equivalent internal circuit note 2 pilot cancellation signal input the pilot signal level must be adjusted since it varies with manufacturing variations in the if output level and other parameters. unit (resistance: , capacitance:f)
continued from preceding page. nc block applications no. 4619- 15 /32 LA1867NM continued on next page. pin function equivalent internal circuit note time constant connection 40 for the monostable multivibrator 41 42 memory circuit pins 43 this time constant sets the gate time to 40 s. the noise rejection ratio increases with the gate time. however, caution is required since multipath and the distortion sensitivity for overmodulated signals are degraded. the memory circuit used when the noise canceller operates pin function equivalent internal circuit note 20 noise killer input the input impedance is about 50 k . unit (resistance: , capacitance:f)
continued from preceding page. mrc block no. 4619- 16 /32 LA1867NM pin function equivalent internal circuit note 38 noise agc sensitivity 39 adjustment pins 35 hpf slope adjustment pin pin 38 is the noise sensitivity setting pin. first set the medium field (about 50 db ) level, and the set the weak field (about 20 to 30 db ) with pin 39 (agc adjustment). the slope of the high-pass filter can be adjusted by changing the value of the resistor (r) connected between pin 35 and ground. if this adjustment is not needed, pin 35 can be left open. pin function equivalent internal circuit note 18 if s-meter output and mrc dc input pin s-meter output block mrc dc input block continued on next page. unit (resistance: , capacitance:f)
continued from preceding page. mrc block applications no. 4619- 17 /32 LA1867NM pin function equivalent internal circuit note 12 mrc output pin pin function equivalent internal circuit note 34 mrc control voltage time constant 15 mrc ac input pin 34 mrc control voltage time constant 16 time constant setting pin constant in methods in which the s-meter ac components are detected directly, the noise amplifier gain is determined by r 2 and the 30 k internal resistance, as shown in figure 1. a certain degree of filtering characteristics can be provided with capacitor c 1 . in methods in which the s-meter high area components are detected, or the nc hdf noise output is detected, the noise amplifier gain is determined by r 2 and 30 k as shown in ffigure 2. here, the frequency characteristics are determined by c 1 . during discharge, the mrc detector time constant is determined by r s (1 k ) and c a . during charge, it is determined by i c and c a . attack time = c a r s (stereo ? mono) recovery time = c a r a (mono ? stereo) unit (resistance: , capacitance:f)
usa g e notes 1. am/fm switching: pin 31 (if v cc ) this pin is shared with the if v cc . when the fm if is operated, the ic automatically switches to fm mode. (note that the switching reference voltage is 3.3 v.) figure 1 2. fm sd and sd adjustment the fm sd and the if counter buffer operate with the elements shown below. the following conditions are required for fm sd operation. v 30 > v a : the s-meter voltage must be higher than the regulator voltage. v 23 < 0.7 v (v be ): the hall detector and band mute must not operate. v 29 = h: a high level must be applied to pin 29 through a 100 k resistance. the following condition is required for if buffer operation. v 19 = h: a high level must be applied to pin 19 through a 51 k resistance. no. 4619- 18 /32 LA1867NM pin v 31 mode 8 v fm open am
3. fm muting on: pin 33 (r33 = 100 k ) the ? db limiting sensitivity can be changed by varying r 33 . (currently, r33 is 25 k to set the ? db limiting sensitivity to 8 db .) 4. fm muting attenuation adjustment: pin 22 (r22 is a 30 or 50 k variable resistor) the pin 23 voltage is divided by the r 22 variable resistor and input to pin 22. the no-input noise convergence is determined by value of the pin 22 voltage. (the LA1867NM has a noise convergence design target of from 5 db to 30 db.) 5. muting time constant the LA1867NM allows the volume level to be changed gradually for field variations during weak field reception by setting the attack and recovery times for the soft mute function. 6. fm mute off function the muting function is turned off if pin 22 is forcibly connected to ground. no. 4619- 19 /32 LA1867NM attack time setting ta = r 23 * c 22 = 940 sec recovery time setting tr = c 22 * r 23 = 23500 sec unit (resistance: , capacitance: f)
mpx bloc k 1. hcc (high-cut control frequency characteristics (pin 1) during hcc control, the output signal frequency characteristics are determined by the capacitance of the external capacitor connected to pin 1. 2. pilot cancellation adjustment (pins 2 and 3) the pin 3 pilot cancellation waveform is a 19 khz signal that does not include a third upper harmonic component, as shown in the figure above. also, no capacitor is required between pin 3 and ground since this signal is in phase with the pilot signal. good pilot cancellation characteristics can be acquired in the left and right channels by adjusting the variable resistor, since the signal does not include a third upper harmonic component. 3. separation adjustment (pin 9) the separation is adjusted by varying the sub-decoder input level with the pin 9 variable resistor. only the sub-decoder level changes when the variable resistor is changed; the mono (main) output level does not change. also, the decoder high-band separation in the sub signal frequency band (23 to 53 khz) will not degraded if the external capacitor c? value is made sufficiently smaller than the variable resistor? impedance. no. 4619- 20 /32 LA1867NM
notes on using the application cir cuits 1. nc block the input impedance of the noise canceller input is about 50 k . carefully consider the low area frequency characteristics when determining the value of the coupling capacitor. note that when the value is 1 f in the application circuit, fc will be about 3 hz. pins 38 and 39 are used to set the noise detection sensitivity and the noise agc. the values of the external components can be determined more easily by first setting the medium field (antenna input levels of about 50 db ) with the noise sensitivity setting pin (pin 38), and then setting the weak field (antenna input levels of about 20 to 30 db ) with the agc adjustment pin (pin 39). care is required in determining these settings since while the agc operation improves as the noise detection sensitivity is increased, inversely, the weak field sensitivity decreases. if noise is detected again during gating, since the monostable multivibrator will be reset, the gate time will change with the magnitude of the noise. finally, set the gate time from the point noise is detected. when the circuit constants in the circuit connected to pin 40 are c = 0.001 f and r = 12 k , the gate time will be about 10 s. 2. mrc block the mrc (multipath rejection circuit) supports three techniques as shown in figures 2, 3 and 4. figure 2 shows the technique in which the s-meter ac component is detected directly. figure 3 shows the technique in which the nc hpf noise is detected, and figure 4 shows the technique in which multipath is detected using the s-meter high area components. figure 2 multipath circuit figure 3 application circuit using nc hpf noise detection no. 4619- 21 /32 LA1867NM
figure 4 application circuit using if s-meter high-area detection in the technique in which the s-meter ac component is detected directly the noise amplifier gain is determined by r 2 and the internal 30 k resistance as shown in figure 5. a certain degree of filtering characteristics can be provided with capacitor c 1 . figure 5 in the technique of figure 4, in which multipath is detected using the s-meter high area components, and in the technique of figure 3, in which the nc hpf noise is detected, the noise amplifier gain is determined by r 2 and the internal 30 k resistance as shown in figure 6. the frequency characteristics of the circuit are determined by the capacitor c 1 . figure 6 no. 4619- 22 /32 LA1867NM
the time constants with which the mrc controls the separation are determined by the internal 1 k resistance and c 2 on discharge, and the 7 a fixed current and c 2 on charge. coil specifications toko electric corporation coils 7kls m402aes-1298 sumida electric coils qu-7l sa-208 ceramic oscillators murata mfg. co., ltd. csb912jf104 no. 4619- 23 /32 LA1867NM figure 7 figure 8 6-4 4t 6-3 22 1/4t 3-1 65t c 91 pf q 30 4-3 18 1/4t 3-1 70 1/4t c 100 pf q 35
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no. 4619- 32 /32 LA1867NM this catalog provides information as of february, 1997. specifications and information herein are subject to change without notice. n no products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. n anyone purchasing any products described or contained herein for an above-mentioned use shall: accept full responsibility and indemnify and defend sanyo electric co., ltd., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on sanyo electric co., ltd., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. n information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. sanyo 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.

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