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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 el ectronics 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. 51111 sy 20110428-s00003/62409 ms 20090615-s00012 no.a1494-1/11 lv2285vb overview the lv2285vb is ic for fm transmitter. this ic is chiefl y composed of the following block. mpx block for stereo modulation, rfvco block for fm modulation, and pll block for rf output frequency. at the result, this ic achieves fm transmitter with low power consumption by 1chip. additionally, the auto sleep function is in stalled. this function automatically sw itches the standby and active according to the state of the audio input. it is possible to achiev e a more dynamic electric power reduction as a result. feature ? the function necessary for fm transmission has been integrated into 1chip. ? the best low current consumption operation for portable application ? the auto sleep function to reduce more dynamic current consumption ? general i 2 c i/f and, sanyo original audio control i/f is installed functions ? audio: stereo modulation using pilot tone system, audio attenuation ? rf: vco, programmable gain driver amplifier ? bus control: i 2 c i/f , audio control i/f ? pll: 70mhz to 110mhz 100khz step ? regulator: 2.8v ldo regulator, auto sleep function specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max pin 6 7.0 v maximum input voltage vin max vcc + 0.3 v minimum input voltage vin min -0.3 v allowable power dissipation pd max ta 85 c, mounted on a specified board.* 500 mw operating temperature topr -10 to 85 c storage temperature tstg -55 to 150 c * specified board: 114.3mm 76.1mm 1.6mm, glass epoxy board. bi-cmos ic fm transmitter ic with stereo modulation, auto sleep function orderin g numbe r : ena1494a
lv2285vb no.a1494-2/11 recommended operating conditions at ta = 25 c parameter symbol conditions ratings unit recommended supply voltage v cc pin 6 3.3 v operating supply voltage v cc op pin 6 2.8 to 5.5 v electrical characteristics at ta = 25 c, v cc = 3.3v, l/r input = 1khz, 425mvrms, i 2 c bits = initial ratings parameter symbol conditions min typ max unit circuit current i cc pin 6 (no signal) 8 10 ma standby current i stb pin 6 (no signal, i 2 c?en?=?0?) 40 60 a audio and mpx block minimum audio input v a min pin 1 and 24 input 30 mvrms maximum audio input v a max pin 1 and 24 input 900 mvrms audio input frequency faf pin 1 and 24 input 20 15k hz channel separation sep pin 7, composite output, l>r, r>l 20 40 db channel balance cb pin 7, composite output -2 0 +2 db total harmonic distortion thd pin 7, composite output 0.1 0.3 % pilot tone output level pmod i 2 c bits ?st?=?1?, ?pilot?=?1? 0.5 0.85 1.2 mvpp composite output level mpxout 2.9 3.8 4.6 mvrms audio mute mute i 2 c bit ?mute?=?1? 30 35 db att(1) att[2:0] = ?111? ? ?110? 2.3 db att(2) att[2:0] = ?110? ? ?101? 2.2 db att(3) att[2:0] = ?101? ? ?100? 2.8 db att(4) att[2:0] = ?100? ? ?011? 2.3 db att(5) att[2:0] = ?011? ? ?010? 4.3 db att(6) att[2:0] = ?010? ? ?001? 3.3 db audio attenuation step att(7) att[2:0] = ?001? ? ?000? 1.6 db crystal oscillator frequency(1) fxosc(1) pin 21 and pin22 76 khz audio control block audio control frequency f cont pin 2 and 23 input 7.5 khz audio control input v cont pin 2 and 23 input 1.2 vp-p auto sleep block turn-off time t off the time from no signal to turn-off. if the v cc voltage is supplied, lv2285vb maintains i 2 c data. ctc (pin 20) = 2.2 f 45 70 300 sec pll block i 2 c input ?high? voltage v h 0.8v cc v cc +0.3 v i 2 c input ?low? voltage v l -0.3 0.2v cc v rf input frequency fpll step = 100khz, see table 2 70 110 mhz crystal oscillator frequency fxosc(2) pin 16 16 - mhz external clock frequency fext ? external clock injection to pin 16 instead of 16mhz crystal oscillation. ? when the lsi is standby mode, external clock should be stop. 1 24mhz cp output current i cp cp voltage = 1.4v 30 a rf block rfoutput rf out f = 98mhz, rf[2:0] = ?011?, pin 12 output 109 112 115 db v rf output adjustment step rf step rf[2:0] = ?000? to ?111?, totally 8 steps. 0.3 0.9 1.4 db rf frequency f rf 100khz step 70 110 mhz i 2 c block input to pin 2/23 : audio control i/f -0.3 0.2v cc v i 2 c input switch i2csw * input to pin 17/18 : i 2 c i/f 0.8v cc v cc +0.3 v * use case ( i 2 c i/f ) : please set pin 19 = high.
lv2285vb no.a1494-3/11 package dimensions unit : mm (typ) 3287 pin assignment 16 15 14 13 r-input r-cont 76k osc in 76k osc out tc i2csw sda scl 20 19 18 17 24 23 22 21 5 gnd 6 v cc 7 composite out 8 cp out 11 10 9 3 gnd 4 mpx+b 1 l-input 2 l-cont 12 rf+b vco gnd rf out xtal gnd pll+b gnd top view lv2285vb sanyo : ssop24(225mil) 6.4 6.5 0.5 4.4 (0.5) (1.3) 24 13 1 12 0.22 0.5 0.15 0.1 1.5max
lv2285vb no.a1494-4/11 block diagram and application circuit example 16 15 14 13 20 19 18 17 24 23 22 21 5 6 7 8 11 10 9 3 4 1 2 12 switch attenuation switch 2.8v regulator 1/2 1/2 x?tal osc auto sleep selector & shift register charge pump phase det r-counter x?tal osc vco p-counter (mute,st) (att[2:0]) (pilot) (p[10:0]) (rf[2:0]) 38khz 38khz + v cc + sda scl i2csw 16mhz 76khz r-input l-input
lv2285vb no.a1494-5/11 pin function pin no. pin name dc voltage (v) function equivalent circuit 1 l-input 0 left channel input. if audio source dc voltage is not 0v, ac coupling capacitance is required. pre-emphasis capacitance and resistance should be required. 6 4 1 5 24 1k 10k 2 l-cont 1.2 data input pin for audio control. external coupling capacitance is required. 6 2 5 23 50k 3 gnd 0 4 mpx+b 2.8 ldo regulator output. external decoupling capacitance is required. 6 4 5 5 gnd 0 6 v cc 3.3 7 composite out stereo modulated output. 6 7 5 4 5.1k 9.4k 8 cp out charge pump current output. 6 8 9 4 30 a 30 a 9 gnd 0 continued on next page.
lv2285vb no.a1494-6/11 continued from preceding page. pin no. pin name dc voltage (v) function equivalent circuit 10 vco 2.2 transistor base pin for colpitz oscillator. 6 10 9 11 11 rf+b 2.8 ldo regulator output for rf blocks. 6 11 5 12 rf out 2.8 collector ou tput. inductance should be connected between pin 11 and pin 12 for getting resonant frequency and making pin 12 dc bias 2.8v. 6 12 13 11 450 20 13 gnd 0 14 pll+b 2.8 ldo regulator output for digital blocks. 6 14 5 15 gnd 0 16 xtal 16mhz crystal is needed for pll reference frequency. if external clock is injected to pin 16. frequency should be from 1mhz to 24mhz and n(integer) 200khz. 6 16 15 14 17 scl i 2 c clock input. 6 17 15 cmos logic inpit 10k continued on next page.
lv2285vb no.a1494-7/11 continued from preceding page. pin no. pin name dc voltage (v) function equivalent circuit 18 sda i 2 c data input. 6 18 15 cmos logic inpit 19 i2csw the change switch of the i 2 c data input pin. when pin 19 = gnd case, audio control i/f is selected (pin 2/23). in one side, when pin 19 = v cc case, i 2 c i/f is selected (pin 17/18). 6 19 15 cmos logic inpit 10k 20 tc 2.8 connect capacitance. turn-off time is in proportion to this capacity value. 6 20 15 1k 1k 21 76k osc out 2.0 for stereo modulator pilot signal and sub carrier. 76khz crystal should be connected between pin 21 and pin 22. 14 20 15 1k 1k 21 1m 6 22 76k osc in 0.7 see pin 21. see pin 21. 23 r-cont 1.2 clock input for audio control. see pin 2 see pin 2. 24 r-input 0 see pin 1. see pin 1.
lv2285vb no.a1494-8/11 i 2 c bus definition table 1 : i 2 c register map bit name byte msb *1 lsb ack ad7 ad6 ad5 ad4 ad3 ad2 ad1 r/w address byte 1 1 1 0 1 0 0 0 0 a p10 p9 p8 p7 p6 p5 p4 p3 control byte 1 2 0 1 1 1 1 0 1 0 a p2 p1 p0 res2 st pilot en mute control byte 2 3 1 0 0 0 1 1 0 0 a res1 res0 rf2 rf1 rf0 att2 att1 att0 control byte 3 4 *2 *2 0 1 1 0 1 0 a r6 r5 r4 r3 r2 r1 r0 test control byte 4 5 1 0 1 0 0 0 0 0 a *1 : msb is transmitted first. *2 : don?t care table 2 : i 2 c register map description bit name initial description ad[7:0] address bit 1101 000 lv2285vb i 2 c 7bit address r/w read / write 0 write mode only a acknowledge p[10:0] programmable counter 0111 1010 100 11bit programmable counter. rf frequency=(p10 2 10 + p9 2 9 + ... p1 2 1 + p0) 100khz res2 reserved bit 0 st mono / stereo 1 (stereo) stereo modulation control. ?st?=?0? monaural mode, ?st?=?1? : stereo mode. pilot pilot tone output 1 pilot signal control. ?pilot?=?0? : no pilot, ?pilot?=?1? : with pilot en enable 0 (standby) internal ldo control. ?en?=?1? : active, ?en?=?0? : standby mute mute 0 audio mute control. ?mute?=?1? : enable, ?mute?=?0? : disable res[1:0] reserved bits 00 rf[2:0] rf output adjustment 011 rf output level control. rf[2:0]=?111? : maximum, rf[2:0]=?000? : minimum att[2:0] audio attenuator 010 this attenuator is used to adjust fm modulation level.?111? is minimum (0db).?000? is maximum (19db). see audio and mpx block specification. r[6:0] reference counter 1010 000 7bit reference coun ter. reference frequency should be set 100khz. {crystal oscillator frequency(pin 16)}/{(r6 2 6 + r5 2 5 ? +r1 2 1 + r0) 2} = 100khz test reserved bit 0
lv2285vb no.a1494-9/11 i 2 c bus operation lv2285vb (slave) sda scl w s master slave s start condition f stop condition a acknowledge a a a 6543 address byte 210 76543210 lsb lsb msb msb msb first lsb control byte 1 76543210 msb control byte 4 f serial i/f bus controller (master) time chart sda scl tbuf thd ; sta tsu ; dat tsu ; sto stop condition start condition thd ; dat thigh tf tlow tr table 3 : timing specification ratings parameter symbol min typ max unit scl clock frequency fscl 100 khz bus free time between a stop and start condition tbuf 4.7 s hold time start condition thd;sta 4.0 s low period of the scl clock tlow 4.7 s high period of the scl clock thigh 4.0 s data hold time thd;dat 0.0 s data set-up time tsu;dat 250 s rise time of both sda and scl signals tr 1000 ns fall time of both sda and scl signals tf 300 ns set-up time for stop condition tsu;sto 4.0 s i 2 c bus ac characteristics: temp = 25 c, v cc = 3.3v note: i 2 c bus is registered trademark of the philips co..
lv2285vb no.a1494-10/11 usage note stereo modulation in generally, how to generate stereo modulating signals explain below figure 1. lv2285vb generate composite signal like below figure 2. and it is possible to control sub signals at register [st]. pilot signal is controlled at register [pilot] 38khz [st] rch (24pin) lch (1pin) 19khz [pilot] att [2:0] main (l+r) sub (l ? r) pilot 0 151923 53 38 composite output (pin 7) composite output (pin 7) frequency [khz] figure 1 figure 2 table 1 audio input signal level v.s att[2:0] setting large attenuation 000 l , r input level = 780mvrms 001 l , r input level = 640mvrms 010 l , r input level = 425mvrms 011 l , r input level = 260mvrms 100 l , r input level = 190mvrms 101 l , r input level = 140mvrms 110 l , r input level = 110mvrms small attenuation 111 l , r input level = 80mvrms fm modulation the lv2285vb have best performance of fm modulation at 75khzdev. fm modulation level changes in proportion to composite output level (pin 7) in lv2285vb composed of recommended parts, table 1 is shown relationship that set att [2:0] value against audio input signal level. please refer to table 1 to obtain better audio quality.
lv2285vb ps no.a1494-11/11 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 probabi lity. 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. ac test circuit 16 15 14 13 20 19 18 17 24 23 22 21 5 6 7 8 11 10 9 3 4 1 2 12 lv2285vb + + + stereo dec la3450 l-out r-out comp-out sw3 ab va rf out sw2 a b l-input + + a b sg input r-input 76khz a sda scl v cc sw6 sw4 sw5 16mhz i 2 c switch v cen external clock input sw1 v cc this catalog provides information as of may, 2011. specifications and inform ation herein are subject to change without notice.

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