d0110 sy 20101118-s00005/n0410 sy/o 2710 sy 20101008-s00006 no.a1859-1/9 http://onsemi.com semiconductor components industries, llc, 2013 july, 2013 la72914v overview the la72914v is a fm modulation and demodulation ic for audio signals. and it is possible to use that for the data pulse or the control pulse, etc. functions ? alignment-free fm modulator and demodulator of 4.5mhz. ? alignment-free fm modulator and demodulator of 6.5mhz. ? alc/ fmagc, emphasis/ de-emphasis ? carrier frequency adjustment function, standby switch specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max 7.0 v allowable power dissipation pd max ta 70 c * 300 mw operating temperature topr -20 to +70 c storage temperature tstg -40 to +150 c when mounted on a 114.3mm 76.1mm 1.6mm, glass epoxy. recommended operating conditions at ta = 25 c parameter symbol conditions ratings unit recommended supply voltage v cc ta=25 c 5.0 v allowable operating voltage range v cc op ta = -20 to +70 c 4.7 to 5.5 v monolithic linear ic fm modulator and demodulator ic orderin g numbe r : ena1859b stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
la72914v no.a1859-2/9 electrical characteristics at ta = 25 c, v cc = 5v dc characteristic ratings parameter symbol conditions min typ max unit 2.4v regulator vreg measure the dc voltage at pin 2 2.2 2.4 2.6 v i cc 1 measure the current into pin 4 in normal mode. 26.0 33.0 40.0 ma current dissipation i cc 2 measure the current into pin 4 in stand-by mode. 2.0 2.5 3.0 ma control pin (6 pin) low level cnt6l low level of input pin (6pin) in 4.5mhz tx mode. 0 0.4 v control pin (6 pin) middle level cnt6m middle level of input pin (6pin) in stand-by mode. 2.0 3.0 v control pin (6 pin) high level cnt6h high level of input pin (6pin) in 6.5mhz tx mode. 4.5 5.0 v agc stop at pin 11 control voltage agcs voltage of input pin (pin 11) in agc stop 4.5 5.0 v tx off mode at pin 16 control voltage cnt16l voltage of input pin (pin 16) in tx off mode 0 0.4 v sound fm modulation block (tx) ratings parameter symbol conditions min typ max unit ffm1 output frequency of t1b in no sig nals. t6=0.6v, t14:o pen 4.455 4.500 4.545 mhz fm carrier output frequency ffm2 output frequency of t1b in no sig nals. t6=4.2v, t14:o pen 6.435 6.500 6.565 mhz vofm1 output level of t1b in no signals. load impedance = 1k t1-gnd. t6=0.6v 1.9 2.3 2.6 vp-p fm carrier output level vofm2 output level of t1b in no signals. load impedance = 1k t1-gnd. t6=4.2v 1.3 1.7 2.1 vp-p 2hd1 2 nd harmonics distortion of t1b in no signals. load impedance = 1k t1-gnd. t6=0.6v -30 -20 db fm carrier output second harmonics distortion 2hd2 2 nd harmonics distortion of t1b in no signals. load impedance = 1k t1-gnd. t6=4.2v -30 -20 db fm carrier output mute level vfmt output level of t1b in tx off mode. t6=0.6v (4.2v) -60 -50 db fm deviation dev fm deviation of t1a, t6=0.6v (4.2v), input at t16=1.0vp-p/1khz (sine) 20 25 30 khz emphasis characteristic femp t16=200mvp-p, 1khz (sine), m1=t1 output deviation. t16=200mvp-p, 5khz (sine), m2=t1 output deviation. femp=m2-m1 7 12 17 khz alc1 t16a=0.25vp-p, 1khz (sine), t3:open, t6=0.6v, t3 output level 0.45 0.5 0.55 vp-p alc2 t16a=0.6vp-p, 1khz (sine), t3:open, t6=0.6v, t3 output level 0.9 1.0 1.1 vp-p alc characteristic alc3 t16a=1.0vp-p, 1khz (sine), t3:open, t6=0.6v, t3 output level 0.95 1.05 1.15 vp-p fcnt1 no signal input. measure t1b frequency. t16:open, t6=0.6v (4.2v), t14=0.5v -0.22 mhz fm carrier ?fo? adjustment (reference) fcnt2 no signal input. measure t1b frequency. t16:open, t6=0.6v (4.2v), t14=4.5v +-.22 mhz sound fm demodulation block (rx) ratings parameter symbol conditions min typ max unit v out 1 input signal: car=4.5mhz, dev= 25khz, mod=1khz, level: 100mvp-p. t5a input. measure t9b signal level. (t9b-gnd: r out =10k ) t6=4.2v 0.6 0.9 1.3 vp-p sound demodulation level v out 2 input signal: car=6.5mhz, dev= 25khz, mod=1khz, level: 100mvp-p. t5a input. measure t9b signal level. (t9b-gnd: r out =10k ) t6=0.6v 0.7 1.0 1.4 vp-p sn1 input signal: car=4.5mhz, no-modulation. level: 100mvp-p. t5a input. t6=4.2v, (ihf-a) m1=t9b signal level. (t9b-gnd: r out =10k ) sn1=20log(v out 1/m1) 35 50 db s/n sn2 input signal: car=6.5mhz, no-modulation. level: 100mvp-p. t5a input. t6=0.6v, (ihf-a) m1=t9b signal level. (t9b-gnd: r out =10k ) sn1=20log(v out 2/m1) 35 50 db continued on next page
la72914v no.a1859-3/9 continued from preceding page. ratings parameter symbol conditions min typ max unit thd1 same condition v out 1. measure t9b signal. 0 0.3 1.0 % thd thd2 same condition v out 2. measure t9b signal. 0 0.3 1.0 % deem1 input signal: car=4.5mhz, dev= 25khz, mod=5khz, level: 100mvp-p. t5a input. t6=4.2v, m1=t9b signal level. deem=20log(m1/v out 1) -10 -7.5 -5 db de-emphasis characteristic deem2 input signal: car=6.5mhz, dev= 25khz, mod=5khz, level: 100mvp-p. t5a input. t6=0.6v, m1=t9b signal level. deem=20log(m2/v out 2) -10 -7.5 -5 db trp1 t11=4.5v, t6=4.2v, t5a= 4.5mhz, 100mvp-p. t12a=a1. t5a=6.5mhz. 100mvp-p. t12a=b1. trp1=20log(b1/a1) -20 -15 db trap-filter characteristic trp2 t11=4.5v, t6=0.6v, t5a= 4.5mhz, 100mvp-p. t12a=a1. t5a=6.5mhz. 100mvp-p. t12a=b1. trp2=20log(a1/b1) -20 -15 db agc1 t6=4.2v. t5a=4.5mhz, 300mvp-p. measure t12 signal level. 250 350 450 mvp-p agc2 t6=0.6v. t5a=6.5mhz, 300mvp-p. measure t12 signal level. 250 350 450 mvp-p agc3 t6=4.2v. t5a=4.5mhz, 30mvp-p. measure t12 signal level. 200 300 400 mvp-p fm agc characteristic agc4 t6=0.6v. t5a=6.5mhz, 30mvp-p. measure t12 signal level. 200 300 400 mvp-p agcstp1 t6=4.2v. t11=4.5v, t5a=4.5mhz, 100mvp-p. measure t12 signal level. 70 100 140 mvp-p fm agc stop characteristic agcstp2 t6=0.6v. t11=4.5v, t5a=6.5mhz, 100mvp-p. measure t12 signal level. 70 100 140 mvp-p fmin1 input signal: car=4.5mhz, dev= 25khz, mod=1khz, t6=4.2v. when t9b signal is ok, then measure t5a fm input level range. 30 100 300 mvp-p fm input sensitivity fmin2 input signal: car=6.5mhz, dev= 25khz, mod=1khz, t6=0.6v. when t9b signal is ok, then measure t5a fm input level range. 30 100 300 mvp-p package dimensions unit: mm (typ) 3178b sanyo : ssop16(225mil) 5.2 4.4 6.4 0.22 0.65 (0.33) 18 9 16 0.5 0.15 1.5max 0.1 (1.3)
la72914v no.a1859-4/9 pin layout and measurement circuit block diagram and application circuit 1 2 3 4 5 6 7 8 v cc (5v) fm_in mode control (tx,rx/stby) 16 15 14 13 12 11 10 9 gnd de-emphasis filter top view fm_out vreg filter (2.4v) emphasis filter de-emphasis audio_in audio_out fm filter agc filter fmagc monitor vco_ctl alc filter audio_in /tx_ctl t1 t2 t3 t5 t7 t8 t9 t10 t11 t14 t15 t16 + + + + t1b fm_out gnd a t5a fm_in mode_ctl t6 de-emphasis t16a t12 t9b audio_in fmagc_out sign: highly accurate part use power supply (v cc ) 5v 1 2 4 5 6 7 v cc (5v) 8 16 15 14 13 12 11 10 9 : push-pull output vco auto tune fmagc-out monitor agc filter fm filter + bias 2.4v alc (1.0vp-p) 6db amp 10k lpf emphasis fm-amp driver fm- mod vco 4.5m/6.5m vreg 2.4v fmagc-det fmagc phase detector loop filter offset cancel vco 6.5m/4.5m mode & standby control t4r6/stby/t6r 6db-amp driver bias 2.4v trp 4.5m/6.5m de-emphasis 3 alc filter + audio-out (1vp-p) + tx control (high:tx-off /low:tx-on) fm-out (2vp-p) ripple filter emphasis filter 6800pf bpf 1000pf fm-in (0.1vp-p) state control t6r4:p-up stby:open t4r6:p-down de-emphasis filter
la72914v no.a1859-5/9 pin description pin no. pin name description equivalent circuit 1 fm out 4.5mhz or 6.5mhz fm carrier output. push-pull output pin. output level is 2.5vp-p (load resistance=1k ) 1 2 2.4v reg filter internal regulator filter pin. please connect 0.1 f (c1) 2 c1 4v v cc 3 emphasis filter emphasis filter pin. before fm modulation, make emphasis characteristic at audio signal. c1(6800pf) emphasis time constant must be matching de-emphasis time constant. (if you don?t need the emphasis, this pin is open.) 3 c1 4 v cc v cc pin. supply voltage is 5v dc. please connect de-coupling capacitor. (about 47 f) 5 fm in fm signal input. please use capacitor coupling. 5 c1 sig 2.4v 6 mode ctl mode control pin. control modulation frequency tx=4.5mhz: 0 to 0.4v stand-by: 2.0 to 3.0v tx=6.5mhz: 4.5v to v cc 6 continued on next page.
la72914v no.a1859-6/9 continued from preceding page. pin no. pin name description equivalent circuit 7 de-emphasis filter de-emphasis filter pin. de-emphasis time constant must be matching at emphasis time constant. recommend value is 6800pf to 0.01 f. connect cap. coupling to pin8. 7 c1 sig 8 rx audio in internal dc bias is 2.4v. please connect ca p. coupling. 8 c1 2.4v 9 audio out audio signal output pin. push-pull output pin. output level is 1.0vp-p at 1khz. (load resistance=10k ) 9 10 fm filter fm demodulator filter pin. please connect 1.0 f capacitor. (if you need rising of low frequency gain, then change more large capacitor in use.) 10 11 agc filter fm agc filter pin. please connect 0.1 f capacitor. if you need reduce agc-gain, then connect resistor (r1: 11pin-v cc ) if fm agc no need, please set pin11 voltage over 4.5v dc voltage. 11 c1 r1 agc-det continued on next page.
la72914v no.a1859-7/9 continued from preceding page. pin no. pin name description equivalent circuit 12 agc monitor fm agc monitor pin. 12 13 gnd gnd pin. 14 v co ctl modulation frequency fine control pin. adjustment frequency is, about 220khz at 0.5v to 4.5v dc. 14 c1 vr1 2.4v 15 alc ctl audio alc filter pin. please connect 0.47 f capacitor. 15 c1 16 tx audio in (tx-off_ctl) audio signal input pin. internal bias is 2.4v dc. please use capacitor coupling. if dc voltage set to under 0.4v dc, then modulator circuit stops. demodulation circuit is work. this is receiving only mode. (tx-off: 0 to 0.4v) 16 c1 2.4v signal processing outline [modulation block] ? audio signal is input from pin16. (internal bias is dc 2.4v.) go through amp (6db )/alc/lpf (10 khz) a nd emphasis circuit, then input fm-modulation block. after fm-modul ation block, go to output driver block then fm-audio signal output from pin1. ? alc: alc circuit work at pin1 6 input level over than 0.5vp-p. ? lpf: lpf gain is -3db at 10 khz and -6db/oct . keep over modulation from emphasis characteristic. ? emphasis circuit: the pin3 owns an emphasis characteris tic which connected capacitor. recommended value = 6800pf. ? fm modulation: carrier frequency is choos ing from pin6 voltage. when pin16 input level is 0.5vp-p, then fm deviation set to 25 khz. internal lpf reduc e harmonic spectrum. ? output driver: output ac voltage is about 2.0vp-p. (load resistance: 1k )
la72914v no.a1859-8/9 [de-modulation block] ? demodulate audio signal fro m modulated audio signal. ? fm-audio signal is input from pin5. go through 4.5m-trap-fi lter or 6.5mhz-trap-filter a nd agc go to demodulator. after demodulator go to de-emphasis ci rcuit. after de-emphasis circuit signal is output pin7. pin7 signal is charge to dc bias for coupling capacitor at pin8. audio signal fro m pin8 go to 6db amp then output from pi n9. (door-phone application, there are two fm carrier. in this case we recommend a dd bpf before pin5 fm-audio signal input.) ? 4.5m/6.5mhz-trap-filter: internal trap-filter is change for pin6 m ode control. (if modulator freq uency is 4.5mhz, then interna l trap-filter is 4.5mhz.) ? agc: after agc level is control about 0.3vp-p. afte r agc signal go to pin12 fm-monitor and de-modulator. ? de-emphasis circuit: the pin7 owns an de-emphasis characteristic which conn ected capacitor. recommended value = 10nf. ? output signal level: if input fm signal deviation is 25 khz, then output signal level is 1v p-p (typ) from pin9/ (load resistance: 10k at 1 khz.) characteristics frequency responce txin-rxout -15 -9 -6 -3 -12 3 0.01 0.1 10 1 100 0 400 800 200 600 10 100 1000 1500 1000 500 400 500 300 200 alc characteristics 0 2000 0 100 600 1200 fmagc characteristics 1 10000 2500 input level, [mvp-p] internal level of ic, [mvp-p] 1000 pin 16 6db pin 9 alc output level, [mvp-p] input level, [mvp-p] fo=4.5mhz (unmodulated signals) pin 12 output level, [db] frequency, [khz] 0
la72914v ps no.a1859-9/9 application example [above-mentioned recommendation bpf] made by murata mfg.: sfska4m50df0 0 (4.5mhz)/sfska6m50cf00 (6.5mhz) la72914v (pin6:high) mic tx 6.5mhz rx 4.5mhz bpf 4.5mhz lpf 6.5mhz wire la72914v (pin6:low) mic tx 4.5mhz rx 6.5mhz bpf 6.5mhz lpf 4.5mhz on semiconductor and the on logo are registered trademarks of semiconductor components industries, llc (scillc). scillc owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. a listing of scillc?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent-marking.pdf. scillc reserves the right to make changes without further notice to any products herein. scillc mak es no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability ar ising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequentia l or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s techn ical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorize d for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other appli cation in which the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of persona l injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture o fthe part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws a nd is not for resale in any manner.
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