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BH1415F audio ics wireless audio link ic BH1415F the BH1415F 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 cd changer, car tv, car navigation, wireless speakers, personal computer (sound board), game machine 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 data input (ce, ck, da) by serial input. z z z z absolute maximum ratings (ta = 25 c, in measurement circuit.) supply voltage power dissipation storage temperature data 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 ? 70 0.8v cc gnd max. 6.0 + 85 ? 10 15k 155 120 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 control terminal "h" level input voltage control terminal "l" level input voltage
BH1415F audio ics z z z z block diagram shift register mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter mute 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 audio muting data clock chip enable 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
BH1415F 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. 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 = 22.7k ? c
BH1415F audio ics equivalent circuit pin descriptions pin no. 9 10 11 rf oscillator terminal dc (v) 4 7 v cc 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 chip enable terminal the terminal to make high level in serial data input. the clock which takes data and synchronization in serial data input. clock input terminal data input terminal the input terminal of the serial data which is forwarded from the controller audio mute terminal 0.8v cc pin18 : mute on 0.2v cc pin18 : mute off pilot signal adjust terminal 8 19 6 or or or 1 2 v cc 5k
BH1415F 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 measurement circuit fig.1 fig.2 fig.2 fig.3 fig.3 fig.3 fig.3 fig.3 fig.3 fig.6 fig.7 fig.7 fig.7 fig.7 fig.8 fig.8 fig.4 fig.5 quiescent current channel separation sep 25 40 ? ? ? ? ?? ? ? ? ? ? ?? ? db db db dbv db 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 mute attenuation volume transmission output level thd c.b gv m p scr pre v in(lim) f c(lpf) v o(mute) v tx i ih i il v oh v ol i off1 i off2 ? 2 ? 30 ? 20 ? 10 ? 13 ? 48 ? 42 ? 2 ? 16 ? 1.0 ? 100 12 12 40 97 v cc - v cc - 1.0 0.1 0 0 15 50 15 100 0.15 0.15 0.3 + 2 + 2 18 60 18 103 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 v in = ? 20dbv,l + r l r,r l l + r l + r l + r l + r l + r l + r pin5 output level at 1db gain compression v o = ? 3db pin2,21open f tx = 100mhz 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
BH1415F audio ics z z z z measurement circuits quiescent current shift register mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter mute 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 muting data clock chip enable 27p 27p 10 0.01 0.01 100 a 7.6mhz +5v i q fig.1
BH1415F audio ics channel separation channel balance shift register mpx rf osc rf gnd pll v cc gnd v cc lpf lpf program counter mute 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 muting data clock chip enable 27p 27p 10 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 0.01
BH1415F audio ics total harmonic distortion input output gain pilot index of modulation sub carrier rejection ratio pre-emphasis time constant mute attenuation volume shift register mpx rf osc rf gnd pll v cc gnd 0.01 chip enable clock data 27p 27p 7.6mhz 0v 5v (mute on) v cc lpf lpf program counter ihf bpf spectrum analyzer 200hz~15khz 470p 150p 2200p 10 150p 2200p mute phase detector + ~ 4 1 2 1 50 1 19 1 2 v cc + + 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 + + + ? ? pre-emphasis and limiter 1234567891011 22 21 20 19 18 17 16 15 14 13 12 0 10k -60 -50 -40 -30 -20 -10 0 20k 30k 40k 50k scr frequency (hz) output response (db) fig.3
BH1415F audio ics limiter input level shift register mpx rf osc rf gnd pll v cc gnd 0.01 chip enable clock data muting 27p 27p 7.6mhz v cc lpf lpf program counter 470p 150p 2200p 10 150p 2200p mute phase detector + ~ 4 1 2 1 50 1 19 1 2 v cc + + 10 r-ch l-ch v in (lim) f in =400hz 10 + + 10 0.01 100 +5v 10k + + + ? ? pre-emphasis and limiter 1234567891011 22 21 20 19 18 17 16 15 14 13 12 v in(lim) input level (dbv) 1db output level (dbv) fig.4
BH1415F audio ics lpf cut off frequency shift register mpx rf osc rf gnd pll v cc gnd 0.01 chip enable clock data muting 27p 27p 7.6mhz v cc lpf lpf program counter 470p 150p 10 150p mute phase detector + ~ 4 1 2 1 50 1 19 1 2 v cc + + 10 r-ch l-ch f c (lpf) f in =400hz v in = ? 20dbv 10 + + 10 0.01 100 +5v 10k + + + ? ? pre-emphasis and limiter 1234567891011 22 21 20 19 18 17 16 15 14 13 12 f c(lpf) frequency (hz) 3db output response (db) fig.5
BH1415F audio ics transmission output level shift register mpx rf zin=50 ? osc rf gnd pll v cc gnd 0.01 chip enable clock data muting 27p 27p 7.6mhz v cc lpf lpf program counter mute phase detector spectrum analyzer + 4 1 2 1 50 1 19 1 2 v cc + v tx f tx =100mhz 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 + + + ? ? pre-emphasis and limiter 1234567891011 22 21 20 19 18 17 16 15 14 13 12 +
BH1415F audio ics ?h? level input current ?l? level input current ?h? level output voltage ?l? level output voltage shift register mpx rf osc rf gnd pll v cc gnd 0.01 chip enable clock data muting 27p 27p 7.6mhz v cc lpf lpf program counter mute phase detector + 4 1 2 1 50 1 19 1 2 v cc + 0.01 100 +5v 1ma 1ma v oh v oh , v ol v ol fig.7 + + ? ? pre-emphasis and limiter 1234567891011 22 21 20 19 18 17 16 15 14 13 12 v i ih, i il 0v, 5v a
BH1415F audio ics ?off ? level leak input current shift register mpx rf osc rf gnd pll v cc gnd 0.01 chip enable clock data muting 27p 27p 7.6mhz v cc lpf lpf program counter mute phase detector + 4 1 2 1 50 1 19 1 2 v cc + i off1, i off2 0.01 100 +5v 0v, 5v fig.8 + + ? ? pre-emphasis and limiter 1234567891011 22 21 20 19 18 17 16 15 14 13 12 a
BH1415F audio ics z z z z circuit operations input of the serial data ce ck da d 0 d 1 d 2 d 3 d 4 t 0 t 1 pd 1 t 1 t 1 , t 2 , t 3 , t 4 1.5 sec t 5 < 1.5 sec (x'tal : 7.6mh z ) t 2 t 3 t 4 t 5 internal data composition of the serial data (1) pr-ctl (2) om-ctl (3) pd-ctl (4) test da d 0 d 1 d 2 d 3 d 4 d 5 d 6 d 7 d 8 d 9 d 10 pd 0 pd 1 t 0 t 1 mono explanation of the serial data lsb no. control unit / data contents it is the data which sets the program counter number of the dividing.this data can set a transmission frequency. example in case of 99.7mhz oscillation 99.7mh z 100kh z (fref) = 997 3e5(hex) it is a binary value. it sets d 10 with msb and it sets d 0 with lsb. d 0 ~ d 10 (1) program counter 5 11 1 11 1 0 0 00 1 e3 msb d 0 d 1 d 2 d 3 d 4 d 5 d 6 d 7 d 8 d 9 d 10
BH1415F audio ics no. control unit / data contents ? it changes a stereo and monaural operation. condition of the composite signal monaural operation l+r , pilot off stereo operation l+r+(l-r),sin s t+psin t mono mono 0 1 (2) (2) (3) multiplexer pd 0 , pd 1 phase detector t 0 , t 1 test mode ? it controls charge pump output by the phase comparator compulsorily. ? it is data for the lsi test. ? always in t 0 input "1". ? always in t 1 input "0". charge pump output usual operation compulsion by low compulsion by high high impedance pd 0 pd 1 00 0 0 11 1 1 s 2 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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