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BH1416F audio ics wireless audio link ic BH1416F the BH1416F is a fm stereo transmitter ic that transmits simple configuration. the ic consists of a stereo modulator for generating stereo composite signals and a fm transmitter for broadcasting a fm signal on the air. the stereo modulator generates a composite signal which consists of the main, sub, and pilot signal from a 38khz oscillator. the fm transmitter radiates fm wave on the air by modulating the carrier signal with a composite signal. z z z z applications wireless speakers, personal computer(sound board), game machine, cd changer, car tv, car navigation z z z z features 1) it is possible to improve the timbre because it has the pre-emphasis circuit, limiter circuit, and the low-pass filter circu it. 2) built-in pilot-tone system fm stereo modulator circuit. 3) the transmission frequency is stable because it has a pll system fm transmitter circuit. 4) pll controls data input in parallel (4bits, 14ch). z z z z absolute maximum ratings (ta = 25 c, in measurement circuit.) supply voltage power dissipation storage temperature date input voltage phase comparator output voltage ? derating : 4.5mw/ c for operation above ta = 25 c. parameter symbol limits unit v cc pd tstg v v v mw c + 7.0 ? 0.3~v cc + 0.3 ? 0.3~v cc + 0.3 ? 55~ + 125 conditions v in-d v out-p 450 pin8,12 pin15,16,17,18 pin7 ? z z z z recommended operating conditions (ta = 25 c) audio input level parameter symbol min. unit v cc v v v c 4.0 ? 40 ? conditions v in-a f in-a topr t pre f tx v ih v il 20 ? 76.8 88.0 0.8v cc gnd max. 6.0 + 85 ? 10 15k 155 78.0 89.2 v cc 0.2v cc typ. ? ? ? ? ? ? ? ? dbv hz sec mhz pin8,12 pin1,22 pin1,22 pin2,21 pin9,11 pin15,16,17,18 pin15,16,17,18 operating supply voltage operating temperature audio input frequency band pre-emphasis time constant set up range transmission frequency(200khz step) control terminal "h" level input voltage control terminal "l" level input voltage
BH1416F audio ics z z z z block diagram mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter 1234567891011 22 21 20 19 18 17 16 15 14 13 12 l-ch input pre-emphasis time constant lpf time constant pilot signal adjust d 3 d 2 d 1 d 0 x'tal oscillator x'tal oscillator pll v cc r-ch input pre-emphasis time constant lpf time constant filter composite signal output gnd pll phase detector output v cc rf oscillator rf gnd rf output
BH1416F audio ics z z z z pin descriptions pin no. 1 pin descriptions r ? ch audio source input terminal l ? ch audio source input terminal it cuts dc with the capacitor and it inputs r-ch audio signal. it cuts dc with the capacitor and it inputs l-ch audio signal. dc (v) 1 2 v cc 1 2 v cc 1 2 v cc 1 2 v cc 1 2 v cc 1 2 v cc 1 2 v cc 22 2,21 pre-emphasis time constant terminal it connects a capacitor for the time constant of pre-emphasis. =22.7k ? c equivalent circuit 8 6 8 6 8 6 4 22 1 or 21 2 or 20 3 or 43k 1k 100k 50k 50k 50p 22.7k 3,20 lpf time constant terminal this is 15khz lpf. it connects a 150pf capacitor. 100k 100k ? + 4 filter terminal it is a ripple filter for the reference voltage of the audio part. 5 6 7 8 composite signal output terminal it connects to the fm modulator. 8 5 6 8 7 6 gnd gnd ? ? pll phase detector output terminal it connects to the pll lpf circuit. ? power supply terminal v cc
BH1416F audio ics pin no. 9 10 11 pin descriptions rf oscillator terminal dc (v) 4 7 v cc equivalent circuit 8 9 10 12 13,14 15 16 17 18 19 12 18 17 16 15 6 rf gnd gnd ? ? ? ? this is the base terminal of the colpitts oscillator. it connects time constant of the oscillation. 25k 40k 30p 2p 18p 12 14 13 6 8 11 10 rf transmission output terminal it connects to the antenna through bpf. v cc ? 1.9 pll power supply terminal v cc x'tal oscillator terminal it connects a 7.6mhz crystal oscillator. 4k 1m parallel data set up terminal d 0 parallel data set up terminal d 1 parallel data set up terminal d 2 parallel data set up terminal d 3 pilot signal adjust terminal 8 19 6 or or or 1 2 v cc 5k
BH1416F audio ics z z z z electrical characteristics (unless otherwise noted, ta = 25 c, v cc = 5.0v signal source : f in = 400hz) parameter symbol i q 14 20 28 ma min. typ. max. unit conditions fig.1 fig.2 fig.2 fig.3 fig.3 fig.3 fig.3 fig.3 fig.6 fig.7 fig.7 fig.8 fig.8 fig.9 fig.9 fig.4 fig.5 quiescent current channel separation sep 25 40 ? ? ? ?? ? ? ? ? ? ?? ? db db db dbv db db v total harmonic distortion "off" level leak current1 "off" level leak current2 "h" level input current "h" level output voltage "l" level output voltage "l" level input current channel balance input output gain pilot modulation rate sub carrier rejection ratio pre-emphasis time constant limiter input level lpf cut off frequency transmission output level thd c.b gv m p scr pre v in(lim) f c(lpf) v tx i ih i il v oh v ol i off1 i off2 ? 2 ? 30 ? 20 ? 10 ? 13 ? 2 ? 16 ? 1.0 ? 100 12 12 40 98 v cc ? v cc ? 1.0 0.1 0 0 15 50 15 101 0.15 0.15 0.3 + 2 + 2 18 60 18 104 1.0 100 1.0 % % sec khz a a v v na na v in = ? 20dbv v in = ? 20dbv v in = ? 20dbv v in = ? 20dbv v in = ? 20dbv v in = ? 20dbv v in = ? 20dbv,l + r l r,r l l + r l + r l + r l + r l + r pin5 v o = ? 3db pin2,21 open f tx =89.2mhz pin15,16,17,18 v in =5v pin15,16,17,18 v in =0v pin7 i out = ? 1.0ma pin7 i out =1.0ma pin7 v out =5v pin7 v out =gnd output level at 1db gain compression measurement circuit
BH1416F audio ics z z z z measurement circuits quiescent current mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter 1234567891011 22 21 20 19 18 17 16 15 14 13 12 150p 2200p 150p 2200p d 2 d 2 d 1 d 0 27p 27p 10 0.01 0.01 100 a 7.6mhz +5v i q fig.1
BH1416F audio ics channel separation channel balance mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter 1234567891011 22 21 20 19 18 17 16 15 14 13 12 150p 2200p 150p 2200p d 3 d 2 d 1 d 0 27p 27p 10 0.01 10 10k 0.01 10 10 100 470p 7.6mhz +5v fig.2 stereo signal demodulator v ~ v ~ l-ch l-ch r-ch r-ch sep, c.b f in = 400hz v in = -20dbv
BH1416F audio ics total harmonic distortion input output gain pilot index of modulation sub carrier rejection ratio pre-emphasis time constant 0.01 d 0 d 1 d 2 d 3 27p 27p 7.6mhz ihf bpf spectrum analyzer 200hz~15khz 470p 150p 2200p 10 150p 2200p ~ + 10 r-ch l-ch scr thd, v o(mute) g v , m p pre f in =400hz v in = ? 20dbv 10 + + 10 0.01 100 +5v 10k + + 1234567891011 22 21 20 19 18 17 16 15 14 13 12 mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter 0 10k -60 -50 -40 -30 -20 -10 0 20k 30k 40k 50k scr frequency (hz) output response (db) fig.3
BH1416F audio ics limiter input level 470p 150p 2200p 10 150p 2200p ~ + 10 r-ch l-ch v in (lim0) f in =400hz 10 + + 10 0.01 100 +5v 10k + + 1234567891011 22 21 20 19 18 17 16 15 14 13 12 0.01 d 0 d 1 d 2 d 3 27p 27p 7.6mhz mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter v in(lim) input level (dbv) 1db output level (dbv) fig.4
BH1416F audio ics lpf cut off frequency 470p 150p 10 150p ~ + 10 r-ch l-ch f c (lpf) f in =400hz v in = ? 20dbv 10 + + 10 0.01 100 +5v 10k + + 1234567891011 22 21 20 19 18 17 16 15 14 13 12 0.01 d 0 d 1 d 2 d 3 27p 27p 7.6mhz mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter f c(lpf) frequency (hz) 3db output response (db) fig.5
BH1416F audio ics transmission output level zin=50 ? spectrum analyzer v tx f tx =89.2mhz 0.01 0.047 33 100 1000p 10p 22p 1000p 33p 20k 5.1k 10k 10k fem10c-3f6 kv-1471e 2sc2062s (rohm) (toko) (sumida) 100 10 +5v fig.6 + + 1234567891011 22 21 20 19 18 17 16 15 14 13 12 + 0.01 d 0 d 1 d 2 d 3 27p 27p 7.6mhz mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter
BH1416F audio ics ?h? level input current ?l? level input current 0.01 27p 27p 7.6mhz 0.01 100 +5v fig.7 + 1234567891011 22 21 20 19 18 17 16 15 14 13 12 mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter d 0 d 1 d 2 d 3 i ih, i il 0v, 5v a
BH1416F audio ics ?h? level output voltage ?l? level output voltage 0.01 1000p 100 50 sg f in =89.3mhz (v oh ) f in =89.1mhz (v ol ) +5v 1ma 1ma v oh v oh , v ol v ol fig.8 + 1234567891011 22 21 20 19 18 17 16 15 14 13 12 v ~ 0.01 d 0 d 1 d 2 d 3 27p 27p 7.6mhz mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter
BH1416F audio ics ?off ? level leak input current i off1, i off2 0.01 100 +5v 0v, 5v fig.9 + 1234567891011 22 21 20 19 18 17 16 15 14 13 12 a 0.01 d 0 d 1 d 2 d 3 27p 27p 7.6mhz mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter phase detector + 4 1 2 1 50 1 19 1 2 v cc + + ? ? pre-emphasis and limiter
BH1416F audio ics z z z z circuit operation parallel data control data frequency d 0 (pin15) d 1 (pin16) d 2 (pin17) d 3 (pin18) l h h h h h h h h h h h h h h h h h h h h h h h h h h h h h h h h l l l l l l l l l l l l l l l l l l l l l l l l 76.8mhz 77.0mhz 77.2mhz 77.4mhz 77.6mhz 77.8mhz 78.0mhz 88.0mhz 88.2mhz 88.4mhz 88.6mhz 88.8mhz 89.0mhz 89.2mhz l l l l l l l pll stops. phase comparator terminal supports high impedance. pll stops. phase comparator terminal supports high impedance. z z z z external dimensions (units : mm) sop22 1.8 0.1 0.11 0.4 0.1 0.15 0.1 0.3min. 7.8 0.3 5.4 0.2 22 1 12 11 0.15 1.27 13.6 0.2

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