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BH1414K multimedia ics wireless audio link ic BH1414K the BH1414K is a fm stereo transmitter ic that uses a simple configuration. this ic consists of a stereo modulator for generating stereo composite signals and a fm transmitter for broadcasting a fm signal on the air. a high s/n ratio and good timbre transmitter circuit can be composed with a few components. it is available for many applications due to the varieties of setting such as transmission output by serial data input. ! ! ! ! applications cd changer, car tv, car navigation, wireless speakers, personal computer (sound board), game machine ! ! ! ! features 1) it is possible to improve the timbre because it has the pre-emphasis circuit, limiter circuit, and the 19khz/38khz low- pass trap filter circuit. 2) built-in pilot-tone system fm stereo modulator circuit. 3) the transmission frequency is stable because it has a pll system for the fm transmitter circuit. 4) pll data input (ce, ck, da) by serial input. 5) it is possible for input level setting, monaural operation and output on/off control by serial input. 6) it is possible for the transmission output control. ! ! ! ! absolute maximum ratings (ta = 25 c) parameter symbol limits unit supply voltage power dissipation storage temperature range v cc1 v cc2 pd tstg + 9.0 + 10.0 500 ? 55~ + 125 v mw c ? reduced by 5mw for each increase in ta of 1 c over 25 c. ! ! ! ! recommended operating conditions (ta = 25 c) parameter symbol min. typ. max. unit operating supply voltage operating temperature range audio input level audio input frequency transmission frequency v cc topr v in-a f in-a f tx 4.5 ? 40 ? 20 75 ? ? ? ? ? 5.5 + 85 500 15k 110 v c mvrms hz mhz
BH1414K multimedia ics ! ! ! ! block diagram 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 gic4l gic3l gic2l gic1l l-ch input limiter level adjust r-ch input gic1r gic2r gic3r gic4r x'tal oscillator x'tal oscillator v cc 2 (pll) gnd2 (pll) gnd1 reference l-ch mpx input l-ch lpf output gic7l gic6l gic5l pll lpf out pll lpf in pll phase detector output pilot signal output mpx output v cc 1 r-ch mpx input r-ch lpf output gic7r gic6r gic5r audio muting chip enable clock data port rf output gnd3 (rf) rf adjust v cc 3 (rf) rf oscillator rf oscillator 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1
BH1414K multimedia ics ! ! ! ! pin descriptions pin name description equivalent circuit dc voltage (v) l-ch lpf time constant terminal it connects resistor and capacitor. it connects resistor and capacitor. r-ch lpf output and lpf time constant terminal r-ch lpf time constant terminal 1 2 3 4 42 43 44 15 l-ch lpf output and lpf time constant terminal 41 l-ch audio source input terminal r-ch audio source input terminal 5 7 limiter level adjust terminal 6 8 9 10 11 12 13 14 pin no. limiter 41 15 or 4 8 or 3 9 or 2 10 or 44 12 or 42 14 or 1 11 or 43 13 or 1.3k 1.3k 125 1.2k 1k 1k 330 1.2k 1k 1k + + + + ? ? ? ? 2 v cc 1 2 v cc 1 2 v cc 1 17 5 7 38 62k or it cuts dc with the capacitor and it inputs l-ch audio signal. it cuts dc with the capacitor and it inputs r-ch audio signal. it adjusts a limiter level by the resistance. 17 6 38 10k 10k 2 v cc 1 + ?
BH1414K multimedia ics pin name description equivalent circuit dc voltage (v) r-ch mpx input terminal l-ch mpx input terminal power supply 1 terminal 16 17 mpx signal output terminal 18 pilot signal output terminal 19 pll phase detector output terminal 20 pll lpf input terminal 21 pll lpf output terminal 22 40 pin no. 2 v cc 1 it connects to the fm modulator. 17 16 40 38 15k 20k or 2 v cc 1 17 18 38 10k 17 19 38 10k 36 20 37 v cc 2 v cc 1 ? 0.7 it connects to the fm modulator. it connects to the pll lpf circuit. 2 v cc 1 ? 0.7 ? ? 17 21 22 38 2 v cc 1
BH1414K multimedia ics pin name description equivalent circuit dc voltage (v) rf oscillator terminal power supply 3 terminal (rf) 23 25 rf adjust terminal 26 rf transmission output terminal 28 port output terminal 29 data input terminal 30 clock input terminal 31 chip enable terminal 32 audio mute terminal 33 24 pin no. 9 v cc 5 it connects resistor and capacitor. it connects lc. this is the colpitts oscillator. it connects time constant of the oscillation. 29 37 v cc v cc gnd3 (rf) 27 gnd 25 23 24 27 25k 20k 4 v cc 3 ? 0.9 9 v cc 5 ? 0.7 the input terminal of the serial data which is forwarded from the controller. the clock which takes data and synchronization in serial data input. the terminal to make high level in serial data input. 0.8v cc 2 pin33 : mute off 0.2v cc 2 pin33 : mute on ? ? 25 28 26 27 30k 10k 36 33 32 31 30 37 or or or
BH1414K multimedia ics pin name description equivalent circuit dc voltage (v) x'tal oscillator terminal power supply 2 terminal (pll) 34 35 36 gnd2 (pll) 37 gnd1 38 reference voltage terminal 39 pin no. it is a ripple filter for the reference voltage. it connects a 7.6mhz crystal oscillator. v cc gnd gnd 36 34 35 37 4k 1m ? 2 v cc 1 17 39 38
BH1414K multimedia ics ! ! ! ! electrical characteristics (unless otherwise noted, ta = 25 c, v cc =5.0v, signal source : f in =400hz) 15 30 ? ? 1.5 ? 4 + 2 ? 10 205 ? 2 ? ? 55 ? 180 ? 84 ? 3 ? ? 1.0 v cc ? 1.0 ? ? ? 100 ? ? 21 45 0.1 0 ? 2 + 4 ? 8 260 0.5 ? 37 ? 49 68 ? 30 200 ? 68 87 0 ? ? v cc ? 0.3 0.3 ? ? 0.2 ? 29 ? 0.3 + 1.5 0 + 6 ? 6 325 + 1.5 ? 30 ? 35 ? ? 20 220 ? 60 90 + 3 1.0 ? ? 1.0 100 ? 1.0 1.0 ma db % db db db db mvrms db db db db db mv p-p db db v khz a a v v na na v a v in = 125mvrms, l r, r l v in = 125mvrms, l + r v in = 125mvrms, l + r v in = 125mvrms, evr = 0db, l + r v in = 125mvrms, evr =+ 6db, l + r v in = 125mvrms, evr =? 6db, l + r output distortion at 3% for input level v in = 125mvrms, f = 10khz v in = 125mvrms, f = 19khz v in = 125mvrms, f = 38khz v in = 125mvrms, l + r v in = 125mvrms, l + r pin19 v in = 125mvrms, l + r f tx = 100mhz f tx = 100mhz pin30, 31, 32, 33 v in = 5v pin30, 31, 32, 33 v in = 0v pin20 i out =? 1.0ma pin20 i out = 1.0ma pin20 v out = 5v pin20 v out = gnd pin29 i out = 3.0ma pin29 v out = 5v fig.1 fig.2 fig.3 fig.2 fig.3 fig.3 fig.3 fig.4 fig.5 fig.5 fig.5 fig.3 fig.3 fig.3 fig.6 fig.7 fig.7 fig.8 fig.8 fig.8 fig.8 fig.9 fig.9 fig.8 fig.9 quiescent current channel separation total harmonic distortion channel balance input output gain 1 input output gain 2 input output gain 3 limiter input level lpf attenuation volume 1 lpf attenuation volume 2 lpf attenuation volume 3 signal to noise ratio sub carrier rejection ratio pilot output level mute attenuation volume transmission output level transmission frequency precision "h" level input current "l" level input current "h" level output voltage "l" level output voltage "off" level leak current 1 "off" level leak current 2 "l" level output voltage "off" level leak current i q sep thd c.b g v1 g v2 g v3 v in(lim) v o(lpf)1 v o(lpf)2 v o(lpf)3 s/n scr v op v o(mute) v tx ? f tx i ih i il v oh v ol i off1 i off2 v ol i off parameter symbol min. typ. max. unit conditions meaasurement circuit this product is not designed for protection against radioactive rays. the specification of transmission output level be based on the radio law in every country and the area.
BH1414K multimedia ics ! ! ! ! measuring circuits quiescent current 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 0.47 47 4.7 4.7 0.01 0.01 0.01 51k 620 0.01 620 0.01 0.01 0.01 22 6.8k 100k 10k 620 33p 0.01 270p 33 56 100 100 15p 82p 8p 10k 10k 10k 18p 4700p 68p 100p 1k 200 150 120k 20k 20k 10k 390p 4.7 470p 82k 0.01 0.01 4.7 0.1 7.6mhz ? 27p ? 27p 0.01 330 + 5v i q 0.01 a kv-1471e (toko) fem10c-3f6 (sumida) fem10c-3f6 port data clock txout ce fig.1 ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics channel separation channel balance 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 4.7 0.01 0.01 0.01 51k 51k 1000p 1000p 1 1 51k 10k 10k 620 0.01 620 0.01 0.01 0.01 22 0.01 33 120k 20k 10k 390p 4.7 0.01 0.01 4.7 0.1 7.6mhz ? 27p ? 27p 0.01 330 + 5v 0.01 port data clock ce fig.2 l-ch r-ch f in =400hz v in =125mvrms stereo signal demodulator sep, c.b v l-ch v r-ch ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics total harmonic distortion input output gain signal to noise ratio sub carrier rejection ratio pilot output level 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 4.7 0.01 0.01 0.01 51k 51k 1000p 1000p 1 1 51k 10k 10k 620 0.01 620 0.01 0.01 0.01 22 0.01 33 10k 4.7 10k 1 0.01 0.01 4.7 0.1 7.6mhz ? 27p ? 27p 0.01 330 + 5v 0.01 port data clock ce fig.3 f in =400hz v in =125mvrms 1hf bpf 200hz~15khz spectrum analyzer thd, g v , s/n scr v op v v 0 0 ? 10 ? 20 ? 30 ? 40 ? 50 ? 60 10k 20k 30k 40k 50k scr frequency (hz) output response(db) ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics limiter input level 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 4.7 0.01 0.01 0.01 51k 51k 1000p 1000p 1 1 51k 10k 10k 620 0.01 620 0.01 0.01 0.01 22 0.01 33 10k 4.7 0.01 0.01 4.7 0.1 7.6mhz ? 27p ? 27p 0.01 330 + 5v 0.01 port data clock ce fig.4 f in =400hz ihf bpf 200hz~15khz v in(lim) thd=3% v ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics lpf attenuation volume 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 4.7 0.01 0.01 0.01 51k 51k 1 1 51k 10k 10k 620 0.01 620 0.01 0.01 0.01 22 0.01 33 10k 4.7 0.01 0.01 4.7 0.1 7.6mhz ? 27p ? 27p 0.01 330 + 5v 0.01 port data clock ce fig.5 f in =400hz 10khz 19khz 38khz v in =125mvrms v o(lpf) v ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics mute attenuation volume 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 4.7 0.01 0.01 0.01 51k 51k 1000p 1000p 1 1 51k 10k 10k 620 0.01 620 0.01 0.01 0.01 22 0.01 33 10k 4.7 0.01 0.01 4.7 0.1 7.6mhz ? 27p ? 27p 0.01 330 + 5v 0.01 port data clock ce off on fig.6 f in =400hz v in =125mvrms ihf bpf 200hz~15khz v o(mute) v mute ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics transmission output level transmission frequency precision 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 0.47 47 4.7 0.01 0.01 0.01 51k 620 0.01 620 0.01 0.01 0.01 22 6.8k 100k 10k 620 33p 0.01 270p 33 56 100 100 15p 82p 8p 10k 10k 18p 4700p 68p 100p 1k 200 150 470p 82k 0.01 0.01 4.7 0.1 7.6mhz ? 27p ? 27p 0.01 330 + 5v 0.01 kv-1471e (toko) fem10c-3f6 (sumida) fem10c-3f6 port data clock txout ce fig.7 ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics ?h? level input current ?l? level input current ?h? level output voltage ?l? level output voltage 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 4.7 0.01 0.01 0.01 51k 620 0.01 620 0.01 0.01 0.01 22 0.01 33 0.01 0.01 4.7 0.1 7.6mhz ? 27p ? 27p 0.01 330 + 5v 0.01 port data clock ce mute fig.8 1ma 1ma v ol v oh v oh , v ol + 5v v 3ma v ol + 5v v a 0v, 5v i ih , i il ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics ?off? level leak current 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 4.7 0.01 0.01 0.01 51k 620 0.01 620 0.01 0.01 0.01 22 0.01 33 0.01 0.01 4.7 0.1 7.6mhz ? 27p ? 27p 0.01 330 + 5v 0.01 data clock ce fig.9 a 5v i off a 0v, 5v i off1 , i off2 ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics ! ! ! ! circuit operations (1) input of the serial data d 0 d 1 d 2 d 3 d 4 t 1 t 0 pd 1 t 1 t 2 t 3 t 4 t 5 ce ck da internal data t 1 , t 2 , t 3 , t 4 1.5 sec t 5 < 1.5 sec (x'tal : 7.6mhz) when the serial data input terminal (pin 30, pin 31, pin 32) and the mute control terminal (pin 33) connect with the -com, in off the power of BH1414K and on the power of -com, because the current flows backward from the -com to BH1414K, insert limitation resistance between the serial data input terminal and the data output terminal of -com. but, when the data output by -com doesn?t always maintain at the ?h? voltage, that matter may be left out of consideration. power on power off r (31,32,33) 30 36 37 com (2) composition of the serial data d 0 d 1 d 2 d 3 d 4 d 5 d 6 d 7 d 8 d 9 d 10 d 11 vr 0 vr 1 vr 2 vr 3 pl vco 1 vco 2 po pd 0 pd 1 t 0 t 1 (1) pr-ctl (2) evr-ctl (3) pl-ctl (4) vco-ctl (5) po-ctl (6) pd-ctl (7) test da
BH1414K multimedia ics (3) explanation of the serial data it is the data which sets the program counter number of the dividing. this data can set a transmission frequency. it is a binary value. it sets d 11 with msb and it sets d 0 with lsb. it controls evr. l-ch and r-ch are set at the same time. example in case of 99.7mhz oscillation 99.7mhz 100khz(fref) = 997 3e5(hex) (1) (2) (3) (4) program counter d 0 ~d 11 evr vr 0 ~vr 3 multiplexer pl vco vco 1 , vco 2 no. control unit contents d 0 d 1 d 2 d 3 d 4 d 5 d 6 d 7 d 8 d 9 d 10 d 11 5 1 1 11111 000 00 e3 lsb msb vr 0 vr 1 vr 2 vr 3 evr gain 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 ? 6 ? 6 ? 5 ? 4 ? 3 ? 2 ? 1 0 0 +1 +2 +3 +4 +5 +6 +6 it changes a stereo and monaural operation. pl condition of the composite signal 0 1 stereo operation monaural operation l + r + (l ? r) sin s t + p sin t 2 s l + r, pilot off it controls the vco operation. vco 1 vco 2 vco 0 0 or 1 0 or 1 1 enable disable it controls open collector output. it controls change pump output by the phase comparator compulsorily. (5) (6) it is data for the lsi test. always input "00". (7) phase detector pd 0 , pd 1 test mode t 0 , t 1 port(pin29) po po open collector output 0 1 high impedance low (on) pd 0 pd 1 charge pump output 00 0 0 1 11 1 usual operation high impedance compulsion by low compulsion by high
BH1414K multimedia ics ! ! ! ! application example 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 12 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 shift register 4 1 2 1 19 1 50 1 2 v cc rf rf osc program countor phase detector mute mpx limiter limiter 19k/38khz lpf 19k/38khz lpf gnd3 v cc 3 +? ref +? evr evr + ? ref ref ref v cc 2 gnd2 gnd1 v cc 1 0.47 100 4.7 4.7 0.01 0.01 0.01 51k 10k 10k 51k 51k (620) 1k 1k 0.01 (620) 0.01 0.01 0.01 22 6.8k 100k 100 15p 1000p 1000p 270p 56 100 100 33p 68 33p 33p 10k 10k 10k 15p 4700p 68p 100p 1k 200 300 120k 20k 20k 10k 330p 4.7 470p 82k 10k 0.01 0.01 4.7 0.1 7.6mhz ? 18p ? 18p 0.01 330 v cc gnd 0.01 bc fem10c-3f6 5 6 1 10 port gnd on off txout fig.10 1000p 1 1 1000p l-in r-in gnd ? the constant of the capacitor must be determined by the agreement with a crystal maker.
BH1414K multimedia ics ! ! ! ! external dimensions (units : mm) qfp44 33 23 22 12 1 34 44 10.00.2 14.00.3 0.350.1 10.00.2 14.00.3 1.2 0.05 2.150.1 0.150.1 0.8 11 0.15

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