Multimedia ICs Vocal fader IC BA3836 Realizes karaoke functionality by enabling you to erase only the vocals from commercially available music software. Applications •Mini-components, radio cassette players, car stereos, karaoke sets •1)Features Vocal fader functions (erase vocals from commer- 4) 5) 6) 7) cially available music software) all on one chip. 2) Has internal secondary active LPF to enable a highdegree of vocal cancellation (synchronous rejection ratio) while retaining the same feeling. 3) Three control pins for switching between 4 modes: through, vocal fader, sound multiplexing, and mute. Key controller input and internal switches. Internal microphone amplifier. Low noise and low distortion. Few external components. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Unit Power supply voltage VCC Max. 18 V Power dissipation 1000∗1 Pd mW Operating temperature Topr – 40 ~ + 85 °C Storage temperature Tstg – 55 ~ + 125 °C ∗1 Reduced by 10mW for each increase in Ta of 1°C over 25°C when mounted. •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol Min. Typ. Max. Unit VCC 5.4 — 10 V 1 Multimedia ICs BA3836 •Block diagram C B A ROUT LP LP LP RIN 16 15 14 13 12 11 10 9 – LOGIC – + – + + SW3 R L+R SW2 + – + SW1 L–R – + L + – SW4 + – 1 2 3 4 5 6 7 8 VCC MIC LOUT FK TK LIN BIAS GND •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC Parameter Symbol Min. Typ. Max. = 10V, fIN = 1kHz, VIN = 150mV, RL = 100kΩ) Unit Conditions IQ 1.6 2.6 3.3 mA Maximum output voltage Vom 2.3 2.8 — Vrms L / R gain GVT 10 14 17 dB Through mode Low frequency gain GVF 10 14 17 dB fIN = 50Hz, vocal fader mode Microphone gain GVM 5 8 11 dB Quiescent current Through mode THD = 1%, through mode — Crosstalk CT 54 70 — dB fIN = 1kHz Mute attenuation MU 74 80 — dB fIN = 1kHz Vocal suppression rate SV 27 33 — dB Vocal fader mode Total harmonic distortion THD — 0.02 0.07 % Through mode, BW: 400Hz to 30kHz Noise level VN — 15 22 Vrms Rg = 0, DIN AUDIO Input impedance RIN 35 50 65 kΩ LIN, RIN, MICIN, FK Control pin threshold (high) VthH 4.7 — — V — Control pin threshold (low) VthL — — 0.3 V — ∆DCB — 6 18 mV Pin 15 switching ∆DCC — 6 18 mV Pin 16 switching Output switching DC differential 2 Multimedia ICs BA3836 •Measurement circuit A 4.7V A 51k 1µ A 1µ 51k 1µ 51k C7 0.3V 0.047µ 0.22µ C5 C6 10µ 16 15 14 13 12 11 10 9 C B A Rout LP LP LP RIN Vcc MIC IN LOUT FK TK LIN BIAS GND 1 2 3 4 5 6 7 8 C1 A C2 1µ C4 C3 10µ 10µ 22µ V 10µ 1k 100k MEASUREMENT FK V V R MIC AUDIO ANALYZER L 600Ω 51k OSC Fig.1 3 Multimedia ICs BA3836 Circuit operation •Mode table (A: pin 14, B: pin 15, C: pin 16) A B C LOUT ROUT TK 0 0 0 MUTE MUTE MUTE 0 0 1 VF VF VF 0 1 0 L L L Sound multiplexing 0 1 1 L R L Through 1 0 0 KC KC R Sound multiplexing 1 0 1 KC KC VF Vocal fader 1 1 0 KC KC L 1 1 1 KC KC L+R MODE Mute Vocal fader Sound multiplexing L+R 0: 0V 1: 5V VF: Vocal fader output KC: Signal passed through key controller (1) Microphone output is not muted during muting (ABC = 000 or 100). (2) For the gain and relative phase, see block diagram. 1) L / R input and output in the through mode are synchronous with a gain of 14dB. 2) L / R input and TK output in the key controller mode are synchronous with a gain of 8dB. 3) L / R output and FK input in the key controller mode are synchronous with a gain of 6dB. 4) MIC input and L / R output are negative phase with a gain of 8dB. 4 Multimedia ICs BA3836 •Application example µ - COM 51k 1µ 51k 1µ 51k 1µ 10µ 0.047µ 0.22µ 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 TAPE,CD LD,etc. 10µ 1k 1µ POWER AMP Key-con MICROPHONE + MICROPHONE Fig.2 notes •(1)Operation •External dimensions (Units: mm) We guarantee the application circuit design, but rec- 19.4 ± 0.3 9 1 8 6.5 ± 0.3 16 0.51Min. 3.2 ± 0.2 4.25 ± 0.3 ommend that you thoroughly check its characteristics in actual use. If you change any of the external component values, check both the static and transient characteristics of the circuit, and allow sufficient margin in your selections to take into account variations in the components and ICs. (2) The vocal fader works by canceling out the synchronous component of the signal, leaving the low components in place. Consequently, the vocal fader may not be very effective with certain recordings. (3) In cases where output DC differential can cause noise when switching between modes, use a time constant for the timing of control pin switching, or take some other measure. (4) Operating supply voltage may vary according to ambient temperature. Using this IC outside the recommended supply voltage range may result in increased crosstalk or mute attenuation. 7.62 0.3 ± 0.1 2.54 0.5 ± 0.1 0° ~ 15° DIP16 5