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ordering number : en4159b 11795th (ot) no. 4159-1/14 overview the LA1835 is an am, fm if and mpx single-chip tuner ic that supports electronic tuning. it was developed specifically for use in home stereo products and is optimal for products with auto-seek systems, since it combines sd and if counting in its auto-seek implementation. furthermore, since the fm detector and mpx vco circuits are adjustment free, adoption of the LA1835 can reduce the number of adjustment steps in the production line. functions am: rf amplifier, mixer, oscillator (with alc), if amplifier, detector, agc, oscillator buffer, tuning indicator (narrow-band sd), if buffer output, stereo if output fm if: if amplifier, quadrature detector, band muting, tuning indicator, if buffer output, s-meter mpx: pll stereo decoder, stereo indicator, forced mono, vco stop function, adjacent channel interference rejection function (114 khz), post- amplifier with muting function features significant reduction in the number of manufacturing adjustment steps fm detector: adjustment free (using a ceramic discriminator) mpx vco: adjustment free (using a ceramic resonator) tuning indicator output provided. (this pin can also be used as a narrow band stop signal and as a muting drive output.) adjustable fm stop sensitivity and bandwidth built-in am local oscillator buffer support for am low band cut control adjustable am stop sensitivity package dimensions unit: mm 3196-dip30sd sanyo: dip30sd [LA1835] LA1835 sanyo electric co.,ltd. semiconductor bussiness headquarters tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110-8534 japan home stereo single-chip tuner ic with electronic tuning support monolithic linear ic any and all sanyo 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? control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. consult with your sanyo representative nearest you before using any sanyo products described or contained herein in such applications. sanyo 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 products described or contained herein.
specifications maximum ratings at ta = 25 c operating conditions at ta = 25 c operating characteristics at ta = 25 c, v cc = 7.0 v, in the specified test circuit using the ic59-3004 socket (yamaichi electric co., ltd.) no. 4159- 2 /14 LA1835 parameter symbol conditions ratings unit recommended supply voltage v cc 7.0 v operating supply voltage v cc op 6.5 to 8.5 v parameter symbol conditions min typ max unit [fm characteristics (mono): fc = 10.7 mhz, fm = 1 khz] quiescent current i cco-fm no input 23 37 46 ma demodulator output v o-fm 100 db , 100% modulation, the pin 16 output 665 1000 1330 mvrms channel balance (monaural) c. b-momo 100 db , 100% modulation, pin 16 output/pin 17 output ?.5 0 +1.5 db total harmonic distortion thd- fm 100 db , 100% modulation, the pin 16 output 0.3 1.5 % signal-to-noise ratio s/n- fm 100 db , 100% modulation, the pin 16 output 67 74 db am suppression ratio amr 100 db , 30% am modulation, the pin 16 output 35 50 db input limiting voltage ?dbl.s 100 db , referenced to 100%, with the input down 3 db 27 35 db sd indicator sensitivity sd-on- fm 47 57 67 db sd indicator bandwidth sd- bw 100 db 120 190 280 khz if counter buffer output v if buff-fm 100 db , the pin 11 output 80 120 160 mvrms v sm-fm (1) 0 db , the pin 12 output 0 0.3 1.0 v s-meter output v sm-fm (2) 60 db , the pin 12 output 0.7 1.5 2.5 v v sm-fm (3) 100 db , the pin 12 output 2.5 4.0 5.0 v muting attenuation mute-att 100 db , 100% modulation, the pin 16 output 80 95 db [fm characteristics (stereo): fc = 10.7 mhz, fm = 1 khz, l + r = 90%, pilot = 10%, v in = 100 db ] separation-left sep-l left channel modulated; pin 17 output/pin 16 output 30 45 db separation-right sep-r right channel modulated; pin 16 output/pin 17 output 30 45 db stereo on level st-on the pilot modulation such that v7 < 0.7 v 1.8 3.6 6.0 % stereo off level st-off the pilot modulation such that v7 > 4.5 v 2.5 % total harmonic distortion (main) thd-main the pin 16 output 0.3 1.5 % channel balance (main) c. b-main pin 16 output/pin 17 output ?.5 0 +1.5 db capture range c. r. pilot = 10% 1.5 % adjacent channel rejection ratio b. rej fs = 113 khz, vs = 90%, pilot = 10%, the pin 16 output 40 db [am characteristics: fc = 1000 khz, fm = 1 khz] quiescent current i cco-am no input 21 29 42 ma detector output v o-am (1) 23 db , 30% modulation, the pin 16 output 25 45 90 mvrms v o-am (2) 80 db , 30% modulation, the pin 16 output 195 310 490 mvrms signal-to-noise ratio s/n- am (1) 23 db , 30% modulation, the pin 16 output 16 20 db s/n- am (2) 80 db , 30% modulation, the pin 16 output 48 54 db thd- am (1) 80 db , 30% modulation, the pin 16 output 0.3 1.0 % total harmonic distortion thd- am (2) 100 db , 30% modulation, the pin 16 output 0.4 1.2 % thd- am (3) 80 db , 80% modulation, the pin 16 output 1.0 4.0 % sd indicator sensitivity sd-on- am 20 30 40 db local oscillator buffer output v osc-am no input, the pin 30 output 110 160 mvrms low-band attenuation low-cut the output for fm = 100 hz referenced to fm = 1 khz 5.0 7.0 11.0 db if counter buffer output v if buff-am 80 db , unmodulated signal, the pin 11 output 140 200 280 mvrms stereo if output v stif-am 80 db , unmodulated signal, the pin 8 output 8.0 17.0 24.0 mvrms s-meter output v sm-am (1) 0 db , unmodulated signal 0 0 0.2 v v sm-am (2) 40 db , unmodulated signal 1.3 3.0 4.5 v parameter symbol conditions ratings unit maximum supply voltage v cc max 9.0 v allowable power dissipation pd max ta 70 c 550 ma operating temperature topr ?0 to +70 c storage temperature tstg ?0 to +125 c
sample application circuit no. 4159- 3 /14 LA1835
test circuit diagram note: since an ic socket is used, these values differ from those used when the ic is mounted on a printed circuit board. no. 4159- 4 /14 LA1835
pin functions no. 4159- 5 /14 LA1835 no. function voltage internal equivalent circuit note 1 2 3 4 5 6 7 8 9 fm if input am mixer output fm if input bypass reg am if input gnd tu-led st-led also functions as the am if output. fm detector vreg v cc vreg vreg vreg 0 v cc v cc 2.1 (fm) 2.7 (am) input impedance: ri = 330 recommended am ift coil: pcfaz-037 (toko co., ltd.) also used for the af noise filter. vreg = 3.6 v input impedance: ri = 2 k active low open collector outputs pin 8 is used for the am stereo if output. recommended ceramic discriminator: cda 10.7mg-48 (murata mfg. co., ltd.) continued on next page.
continued from preceding page. no. 4159- 6 /14 LA1835 no. function voltage internal equivalent circuit note 10 11 12 13 14 15 16 17 18 19 v cc am/fm if buffer output also functions as the output control switch (muting switch). s-meter output also functions as the am sd sensitivity adjustment. am narrow band ceramic filter connection phase comparator low- pass filter (fm/am switch) pilot detector low-pass filter (forced mono) (vco stop) post-amplifier left and right outputs post-amplifier left and right inputs v cc 0 0.3 (fm) 0 (am) 1.5 v cc ?1.4 (fm) 0 (am) v cc ?1.0 vreg vreg vreg vreg a voltage of 1.3 v or higher turns on the post- amplifier output muting. a voltage of 4.0 v or higher turns on the if buffer output. the recommended control voltage for turning muting on is 1.9 v. the am sd sensitivity can be adjusted with the resistor inserted between this pin and ground. since the fm sd sensitivity is affected by this resistor, the am sd sensitivity must be adjusted first. recommended narrow band ceramic filter: bfu450 c4n (murata mfg. co., ltd.) the LA1835 switches to am mode when this pin is connected to ground. if a current of 50 a or larger flows from this pin, the LA1835 switches to mono mode. the vco is stopped if this pin is connected to ground. output impedance: ro = 200 pin 16: left output pin 17: right output inverting inputs, ri = 3.3 k pin 18: left input pin 19: right input continued on next page.
continued from preceding page. no. 4159- 7 /14 LA1835 no. function voltage internal equivalent circuit note 20 21 22 23 24 25 26 27 mpx outputs left and right outputs mpx input mpx vco am/fm demodulator output am low cut amagc am rf input 3.5 3.5 2.9 3.5 (fm) 0 (am) 2.9 (fm) 3.0 (am) 2.9 (fm) 3.0 (am) 0 (fm) 0.5 (am) vreg output impedance ro = 3.3 k pin 20: left de-emphasis pin 21: right de-emphasis input impedance ri = 20 k increasing the value of the external capacitor connected between this pin and pin 24 improves the low frequency separation characteristics. however, the impulse noise associated with switching between am and fm also increases. recommended ceramic oscillator: csb456f15 (murata mfg. co., ltd.) output impedances fm: ro = 250 am: ro = 10 k the separation can be adjusted by changing the value of the external capacitor connected between this pin and ground. the low-band frequency characteristics of the af demodulator can be adjusted by changing the value of the external capacitor connected between this pin and ground. the am detector output can be attenuated by adding a resistor in series with the capacitor. the internal load resistance, r is 6.7 k . pin 27 must be used at the same voltage as pin 4, the regulator voltage. continued on next page.
continued from preceding page. no. 4159- 8 /14 LA1835 no. function voltage internal equivalent circuit note 28 29 30 afc osc oscillator buffer output also functions as the fm sd sensitivity adjustment. vreg vreg 1.6 (fm) 1.3 (am) the fm sd bandwidth can be adjusted by changing the value of the external resistor inserted between pin 28 and pin 4, the regulator voltage. the oscillator coil is connected between pin 29 and pin 4, the regulator voltage. the fm sd sensitivity can be adjusted by changing the value of the external resistor inserted between this pin and ground. the am sd sensitivity must be adjusted before the am fd sensitivity. output impedance ro = 200
no. 4159- 9 /14 LA1835
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no. 4159- 13 /14 LA1835
ps no. 4159- 14 /14 LA1835 this catalog provides information as of august, 1998. specifications and information herein are subject to change without notice. specifications of any and all sanyo 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? 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? products or equipment. sanyo electric 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 and all sanyo products described or contained herein fall under strategic products (including services) controlled under the foreign exchange and foreign trade control law of japan, such products must not be exported without obtaining export license from the ministry of international trade and industry 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 electric 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 ?elivery specification for the sanyo 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 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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