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 lowpass 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 Supply voltage Power dissipation Storage temperature range Symbol Limits VCC1 +9.0 VCC2 +10.0 Unit V Pd 500 mW Tstg −55~+125 °C ∗ Reduced by 5mW for each increase in Ta of 1°C over 25°C. !Recommended operating conditions (Ta = 25°C) Symbol Min. Typ. Max. Unit Operating supply voltage Parameter VCC 4.5 − 5.5 V Operating temperature range Topr −40 − +85 °C Audio input level VIN-A − − 500 mVrms Audio input frequency fIN-A 20 − 15k Hz Transmission frequency fTX 75 − 110 MHz BH1414K Multimedia ICs RF OUTPUT 29 28 27 26 RF OSCILLATOR PORT 30 RF OSCILLATOR DATA 31 VCC3 (RF) CLOCK 32 RF ADJUST CHIP ENABLE 33 GND3 (RF) AUDIO MUTING !Block diagram 25 24 23 VCC3 GND3 RF OSC RF X'tal OSCILLATOR 34 22 PLL LPF OUT + Program countor Shift register X'tal OSCILLATOR 35 1 4 VCC2 (PLL) 36 VCC2 1 19 REF Phase detector 21 PLL LPF IN 20 PLL PHASE DETECTOR OUTPUT 1 2 1 50 GND2 (PLL) 37 GND2 − 19 PILOT SIGNAL OUTPUT GND1 38 GND1 MUTE 18 MPX OUTPUT REF REFERENCE 39 VCC 2 VCC1 17 VCC1 L-ch MPX INPUT 40 L-ch LPF OUTPUT 41 MPX 19k/38kHz LPF 16 R-ch MPX INPUT LIMITER GIC7L 42 LIMITER EVR 19k/38kHz LPF 15 R-ch LPF OUTPUT 14 GIC7R EVR GIC6L 43 13 GIC6R + − − REF REF 1 2 3 4 5 6 7 8 9 10 11 GIC3L GIC2L GIC1L L-ch INPUT LIMITER LEVEL ADJUST R-ch INPUT GIC1R GIC2R GIC3R GIC4R 12 GIC5R GIC4L GIC5L 44 + BH1414K Multimedia ICs !Pin descriptions Pin No. Pin name 1 2 3 4 42 43 44 L-ch LPF time constant terminal Description Equivalent circuit 1.3k 1.3k DC voltage (V) 330 LIMITER 41 15 125 or It connects resistor and capacitor. 4 8 or 3 9 or 15 R-ch LPF output and LPF time constant terminal 2 10 or 1k 1k 1k − + 1k − + + − 1.2k R-ch LPF time constant terminal 1.2k 8 9 10 11 12 13 14 + − It connects resistor and capacitor. 1 VCC 2 1 11 or 44 12 or 43 13 41 L-ch LPF output and LPF time constant terminal or 42 14 or 17 5 L-ch audio source input terminal It cuts DC with the capacitor and it inputs L-ch audio signal. 5 7 7 1 VCC 2 62k or R-ch audio source input terminal It cuts DC with the capacitor and it inputs R-ch audio signal. 38 17 + 1 VCC 2 6 Limiter level adjust terminal − 10k 10k 6 38 It adjusts a limiter level by the resistance. 1 VCC 2 BH1414K Multimedia ICs Pin No. Pin name Description Equivalent circuit DC voltage (V) 17 16 R-ch MPX input terminal 20k 1 VCC 2 16 40 40 15k or L-ch MPX input terminal 1 VCC 2 38 17 Power supply 1 terminal VCC 17 MPX signal output terminal 18 It connects to the FM modulator. 1 VCC 2 −0.7 It connects to the FM modulator. 1 VCC 2 −0.7 10k 18 38 17 Pilot signal output terminal 19 10k 19 38 36 20 PLL phase detector output terminal It connects to the PLL LPF circuit. 20 − 37 17 21 PLL LPF input terminal 21 22 PLL LPF output terminal 38 1 VCC 2 22 − BH1414K Multimedia ICs Pin No. Pin name Description Equivalent circuit DC voltage (V) 25 5 VCC 9 20k 23 23 25k RF oscillator terminal 24 This is the colpitts oscillator. It connects time constant of the oscillation. 5 VCC 9 −0.7 24 27 25 Power supply 3 terminal (RF) VCC 28 RF adjust terminal 10k 26 25 It connects resistor and capacitor. 3 VCC 4 −0.9 28 30k 26 RF transmission output terminal It connects LC. VCC 27 27 GND3 (RF) GND 29 29 − Port output terminal 37 30 Data input terminal 36 31 Clock input terminal 30 31 32 33 or 32 Chip enable terminal 33 Audio mute terminal or The input terminal of the serial data which is forwarded from the controller. The clock which takes data and synchronization in serial data input. − or The terminal to make high level in serial data input. 37 0.8VCC2 ≤ Pin33 : Mute OFF 0.2VCC2 ≥ Pin33 : Mute ON BH1414K Multimedia ICs Pin name Pin No. Equivalent circuit Description DC voltage (V) It connects a 7.6MHz crystal oscillator. − 36 4k 34 35 X'tal oscillator terminal 34 35 1M 37 36 Power supply 2 terminal (PLL) 37 GND2 (PLL) GND 38 GND1 GND VCC 17 39 Reference voltage terminal It is a ripple filter for the reference voltage. 38 39 1 VCC 2 BH1414K Multimedia ICs !Electrical characteristics (Unless otherwise noted, Ta = 25°C, VCC=5.0V, Signal source : fIN=400Hz) Parameter Min. Typ. Max. Unit IQ 15 21 29 mA Channel separation Sep 30 45 − dB VIN=125mVrms, L→R, R→L Fig.2 Total harmonic distortion THD − 0.1 0.3 % VIN=125mVrms, L+R Fig.3 Channel balance C.B −1.5 0 +1.5 dB VIN=125mVrms, L+R Fig.2 Input output gain 1 GV1 −4 −2 0 dB VIN=125mVrms, EVR=0dB, L+R Fig.3 Input output gain 2 GV2 +2 +4 +6 dB VIN=125mVrms, EVR=+6dB, L+R Fig.3 Input output gain 3 GV3 −10 −8 −6 dB VIN=125mVrms, EVR=−6dB, L+R Fig.3 Output distortion at 3% for input level Fig.4 Quiescent current Conditions Meaasurement circuit Symbol Fig.1 Limiter input level VIN(LIM) 205 260 325 mVrms LPF attenuation volume 1 VO(LPF)1 −2 0.5 +1.5 dB VIN=125mVrms, f=10kHz Fig.5 LPF attenuation volume 2 VO(LPF)2 − −37 −30 dB VIN=125mVrms, f=19kHz Fig.5 LPF attenuation volume 3 VO(LPF)3 − −49 −35 dB VIN=125mVrms, f=38kHz Fig.5 Fig.3 Signal to noise ratio S/N 55 68 − dB VIN=125mVrms, L+R Sub carrier rejection ratio SCR − −30 −20 dB VIN=125mVrms, L+R Fig.3 Pilot output level VOP 180 200 220 mVP-P Pin19 Fig.3 Mute attenuation volume VO(MUTE) − −68 −60 dB VIN=125mVrms, L+R Fig.6 Transmission output level VTX 84 87 90 dBµV fTX=100MHz Fig.7 Transmission frequency precision ∆fTX −3 0 +3 kHz fTX=100MHz Fig.7 "H" level input current IIH − − 1.0 µA Pin30, 31, 32, 33 VIN=5V Fig.8 "L" level input current IIL −1.0 − − µA Pin30, 31, 32, 33 VIN=0V Fig.8 − V Pin20 IOUT=−1.0mA Fig.8 "H" level output voltage VOH VCC−1.0 VCC−0.3 "L" level output voltage VOL − 0.3 1.0 V Pin20 IOUT=1.0mA Fig.8 "OFF" level leak current 1 IOFF1 − − 100 nA Pin20 VOUT=5V Fig.9 "OFF" level leak current 2 IOFF2 −100 − − nA Pin20 VOUT=GND Fig.9 "L" level output voltage VOL − 0.2 1.0 V Pin29 IOUT=3.0mA Fig.8 "OFF" level leak current IOFF − − 1.0 µA Pin29 VOUT=5V Fig.9 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 56 31 30 29 28 27 26 24 25 KV-1471E (TOKO) 34 1 19 Phase detector 620 0.1 20 1 2 1 50 37 GND2 120k 390p 20k 4.7 19 MUTE 38 GND1 18 20k REF VCC 2 39 VCC1 17 0.01 330 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − REF 0.01 1 2 3 0.01 4 620 REF 5 6 51k 44 + 0.01 − 7 12 8 9 620 10 0.01 Fig.1 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 0.01 + 22 +5V 47 82k 21 100k REF 4.7 1 4 36 VCC2 − 6.8k Program countor Shift register 35 0.47 22 + ∗27p IQ 10k 10k 82p 470p 23 RF OSC RF ∗27p 7.6MHz 8p 15p 33p VCC3 GND3 A FEM10C-3F6 (SUMIDA) 0.01 10k 10k 32 18p 1k PORT 33 4700p 200 150 270p FEM10C-3F6 DATA 68p CLOCK 33 100p CE 100 100 TXOUT 10k BH1414K Multimedia ICs Channel separation Channel balance 33 CE CLOCK PORT DATA 0.01 33 32 31 30 29 28 27 26 24 25 GND3 RF OSC RF ∗27p 7.6MHz 23 VCC3 34 22 + Program countor Shift register 35 ∗27p 1 4 1 19 REF Phase detector 21 Stereo signal demodulator 20 0.1 36 VCC2 − +5V 1 2 1 50 37 GND2 120k 390p 20k 4.7 L-ch V R-ch 19 Sep, C.B MUTE 38 GND1 18 10k REF VCC 2 VCC1 17 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − 6 8 51k 1 9 620 51k 620 7 10k 5 12 10 0.01 1 0.01 4 51k 3 10k 2 1000p 0.01 1 REF L-ch R-ch fIN=400Hz VIN=125mVrms Fig.2 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 REF 44 + 0.01 − 1000p 0.01 + 22 39 0.01 330 V BH1414K Multimedia ICs Total harmonic distortion Input output gain Signal to noise ratio Sub carrier rejection ratio Pilot output level CE CLOCK Output response(dB) 33 PORT DATA 0.01 0 −10 −20 −30 −40 −50 −60 SCR 0 33 32 31 30 29 28 27 26 24 25 GND3 34 22 + Program countor Shift register 35 ∗27p 1 4 1 19 REF Phase detector 21 VOP 20 1 2 1 50 37 GND2 Spectrum SCR analyzer − 0.1 36 VCC2 1HF BPF 200Hz~15kHz V V 1 10k 4.7 10k 19 MUTE 38 GND1 18 REF VCC 2 39 VCC1 17 0.01 330 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − 6 8 51k 1 9 620 51k 620 7 10k 5 12 10 0.01 1 0.01 4 51k 3 10k 2 1000p 0.01 1 REF fIN=400Hz VIN=125mVrms Fig.3 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 REF 44 + 0.01 − 1000p 0.01 + 22 +5V 10k 20k 30k 40k 50k Frequency (Hz) RF OSC RF ∗27p 7.6MHz 23 VCC3 THD, GV, S/N BH1414K Multimedia ICs Limiter input level 33 CE CLOCK PORT DATA 0.01 33 32 31 30 29 28 27 26 24 25 GND3 RF OSC RF ∗27p 7.6MHz 23 VCC3 34 22 + Program countor Shift register 35 ∗27p 1 4 36 VCC2 1 19 − REF Phase detector 21 IHF BPF 200Hz~15kHz 20 V 0.1 1 2 1 50 37 GND2 19 4.7 MUTE 38 GND1 10k 18 REF VCC 2 39 VCC1 17 0.01 330 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − 6 8 51k 1 9 620 51k 620 7 10k 5 12 10 0.01 1 0.01 4 51k 3 10k 2 1000p 0.01 1 REF fIN=400Hz Fig.4 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 REF 44 + 0.01 − 1000p 0.01 + 22 +5V VIN(LIM) THD=3% BH1414K Multimedia ICs LPF attenuation volume 33 CE CLOCK PORT DATA 0.01 33 32 31 30 29 28 27 26 24 25 GND3 RF OSC RF ∗27p 34 22 + Program countor Shift register 35 ∗27p 1 4 1 19 REF Phase detector 21 20 0.1 36 VCC2 − +5V V 1 2 1 50 37 GND2 4.7 MUTE 38 GND1 10k 18 REF VCC 2 39 VCC1 17 0.01 330 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − REF 620 5 6 7 10k 0.01 4 12 8 9 620 10 0.01 51k 3 10k 2 1 1 51k 0.01 1 REF 51k 44 + 0.01 − fIN=400Hz→10kHz→19kHz→38kHz VIN=125mVrms Fig.5 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 0.01 + VO(LPF) 19 22 7.6MHz 23 VCC3 BH1414K Multimedia ICs Mute attenuation volume 33 CE CLOCK PORT DATA MUTE OFF 0.01 ON 33 32 31 30 29 28 27 26 24 25 GND3 RF OSC RF ∗27p 7.6MHz 23 VCC3 34 22 + Program countor Shift register 35 ∗27p 1 4 36 VCC2 1 19 − REF Phase detector 21 IHF BPF 200Hz~15kHz 20 V 0.1 1 2 1 50 37 GND2 19 4.7 MUTE 38 GND1 10k 18 REF VCC 2 39 VCC1 17 0.01 330 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − 6 1 51k 51k 620 7 8 10k 5 12 9 620 10 0.01 1 0.01 4 51k 3 10k 2 1000p 0.01 1 REF fIN=400Hz VIN=125mVrms Fig.6 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 REF 44 + 0.01 − 1000p 0.01 + 22 +5V VO(MUTE) BH1414K Multimedia ICs Transmission output level Transmission frequency precision 56 31 30 29 28 27 26 KV-1471E (TOKO) 10k 470p 23 VCC3 GND3 RF OSC RF ∗27p 34 1 4 1 19 REF Phase detector 47 82k 21 620 20 0.1 36 VCC2 − 100k Program countor Shift register 35 ∗27p 0.47 22 + 6.8k 7.6MHz 82p 15p 33p 24 25 8p FEM10C-3F6 (SUMIDA) 0.01 10k 10k 32 18p 1k PORT 33 4700p 200 150 270p FEM10C-3F6 DATA 68p CLOCK 33 100p CE 100 100 TXOUT 1 2 1 50 37 GND2 19 MUTE 38 GND1 18 REF VCC 2 39 VCC1 17 0.01 330 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − REF 0.01 1 2 3 0.01 4 620 REF 5 6 51k 44 + 0.01 − 7 12 8 9 620 10 0.01 Fig.7 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 0.01 + 22 +5V BH1414K Multimedia ICs “H” level input current “L” level input current “H” level output voltage “L” level output voltage 33 +5V 3mA A IIH, IIL VOL 33 V 32 31 0.01 PORT DATA CLOCK CE MUTE 0V, 5V 30 29 28 27 26 24 25 RF OSC RF ∗27p 7.6MHz 23 VCC3 GND3 34 22 + Program countor Shift register 35 ∗27p +5V − REF 21 1mA VOL 1 4 36 VCC2 1 19 Phase detector 20 V 0.1 1 2 1 50 37 GND2 VOH, VOL VOH 1mA 19 MUTE 38 GND1 18 REF VCC 2 39 VCC1 17 0.01 330 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − REF 0.01 1 2 3 0.01 4 620 REF 5 6 51k 44 + 0.01 − 7 12 8 9 620 10 0.01 Fig.8 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 0.01 + 22 +5V BH1414K Multimedia ICs “OFF” level leak current 33 CE CLOCK DATA 5V A 33 32 31 30 29 0.01 IOFF 28 27 26 24 25 RF OSC RF ∗27p 7.6MHz 23 VCC3 GND3 34 22 + Program countor Shift register 35 ∗27p − REF 21 IOFF1, IOFF2 1 4 1 19 Phase detector A 20 0.1 36 VCC2 0V, 5V 1 2 1 50 37 GND2 19 MUTE 38 GND1 18 REF VCC 2 39 VCC1 17 0.01 330 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − REF 0.01 1 2 3 0.01 4 620 REF 5 6 51k 44 + 0.01 − 7 12 8 9 620 10 0.01 Fig.9 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 0.01 + 22 +5V BH1414K Multimedia ICs !Circuit operations (1) Input of the serial data t1, t2, t3, t4 ≥ 1.5µsec t5 < 1.5µsec (X'tal : 7.6MHz) t1 t2 t4 t5 t3 CE CK DA D0 D1 D2 D3 D4 PD1 T0 T1 Internal data When the serial data input terminal (Pin 30, Pin 31, Pin 32) and the mute control terminal (Pin 33) connect with the µ-com, in off the power of BH1414K and on the power of µ-com, because the current flows backward from the µ-com to BH1414K, insert limitation resistance between the serial data input terminal and the data output terminal of µ-com. But, when the data output by µ-com doesn’t always maintain at the “H” voltage, that matter may be left out of consideration. Power OFF 36 Power ON µCOM 30 R (31,32,33) 37 D8 D9 D10 VR2 VR3 D11 D7 VR1 D6 VR0 T1 T0 (7) TEST PD1 PD0 (6) PD-CTL VCO2 PO (5) PO-CTL (4) VCO-CTL VCO1 PL (3) PL-CTL (2) EVR-CTL D4 D5 (1) PR-CTL D3 D2 D1 DA D0 (2) Composition of the serial data BH1414K Multimedia ICs (3) Explanation of the serial data 0 1 0 0 1 1 1 1 1 0 D5 D6 D7 D8 D9 D10 LSB (2) EVR VR0~VR3 (3) MULTIPLEXER PL (4) VCO VCO1, VCO2 (5) PORT(Pin29) PO (6) PHASE DETECTOR PD0, PD1 (7) TEST MODE T 0 , T1 0 D11 1 D4 D0~D11 · 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 D11 With MSB and it sets D0 with LSB. Example In case of 99.7MHz oscillation 99.7MHz÷100kHz(fref)=997→3E5(HEX) 5 E 3 D3 PROGRAM COUNTER D2 (1) Contents D1 Control unit D0 No. MSB · It controls EVR. L-ch and R-ch are set at the same time. VR0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 VR1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 VR2 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 VR3 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 EVR GAIN −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 Stereo operation L+R+ (L−R) sin ωst+P sin ωs t 2 1 Monaural operation L+R, Pilot OFF · It controls the VCO operation. VCO1 VCO2 VCO 0 0 or 1 Enable 1 0 or 1 Disable · It controls open collector output. PO 0 Open collector output High impedance 1 Low (ON) · It controls change pump output by the phase comparator compulsorily. PD0 PD1 0 0 Charge pump output Usual operation 0 1 Compulsion by Low 1 0 Compulsion by High 1 1 High impedance · It is data for the LSI test. · Always Input "00". BH1414K Multimedia ICs !Application example 56 100 10k 33p 15p 1000p 68 PORT 10k 33p 33p FEM10C-3F6 1k 10k ON 200 OFF 4700p 10 300 1 6 100p 5 BC 1000p 68p GND 270p 100 TXOUT 32 31 30 29 28 27 26 24 25 470p 23 RF OSC RF ∗18p 34 1 4 1 19 Phase detector 100 20 1 2 1 50 37 GND2 120k 330p 20k 4.7 19 MUTE 38 GND1 18 20k REF VCC 2 39 VCC1 17 0.01 330 MPX 16 4.7 4.7 40 19k/38kHz LPF 41 LIMITER LIMITER 19k/38kHz LPF 15 0.01 0.01 0.01 0.01 42 EVR 14 EVR 13 43 − REF 3 4 5 1k 6 0.01 12 7 8 9 10 1k 10k 2 10k 0.01 1 REF 51k 44 + 0.01 − 0.01 (620) L-IN 1000p 1 51k 1 51k 1000p (620) GND R-IN Fig.10 ∗The constant of the capacitor must be determined by the agreement with a crystal maker. 11 0.01 0.01 + 22 GND 100 82k 21 0.1 36 VCC2 REF 4.7 VCC − 100k Program countor Shift register 35 ∗18p 0.47 22 + 6.8k 7.6MHz 15p VCC3 GND3 10k 33 10k BH1414K Multimedia ICs !External dimensions (Units : mm) 14.0±0.3 10.0±0.2 23 22 44 12 2.15±0.1 0.05 1 0.8 11 0.35±0.1 QFP44 1.2 14.0±0.3 10.0±0.2 33 34 0.15±0.1 0.15