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| Multimedia ICs Vocal fader IC BA3836 Realizes karaoke functionality by enabling you to erase only the vocals from commercially available music software. *Applications radio cassette players, car stereos, Mini-components, karaoke sets *Features functions (erase vocals from commer1) Vocal fader 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. 4) 5) 6) 7) Key controller input and internal switches. Internal microphone amplifier. Low noise and low distortion. Few external components. *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Max. Pd Topr Tstg Limits 18 10001 - 40 ~ + 85 - 55 ~ + 125 Unit V mW C C 1 Reduced by 10mW for each increase in Ta of 1C over 25C when mounted. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol VCC Min. 5.4 Typ. -- Max. 10 Unit V 1 Multimedia ICs BA3836 *Block diagram C 16 B 15 A 14 ROUT 13 LP 12 LP 11 LP 10 RIN 9 LOGIC - + - + -+ SW3 R L+R + SW2 SW1 L-R L - + -+ SW4 +- +- 1 VCC 2 MIC 3 LOUT 4 FK 5 TK 6 LIN 7 BIAS 8 GND *Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 10V, fIN = 1kHz, VIN = 150mV, RL = 100k) Parameter Quiescent current Maximum output voltage L / R gain Low frequency gain Microphone gain Crosstalk Mute attenuation Vocal suppression rate Total harmonic distortion Noise level Input impedance Control pin threshold (high) Control pin threshold (low) Output switching DC differential Symbol IQ Vom GVT GVF GVM CT MU SV THD VN RIN VthH VthL DCB DCC Min. 1.6 2.3 10 10 5 54 74 27 -- -- 35 4.7 -- -- -- Typ. 2.6 2.8 14 14 8 70 80 33 0.02 15 50 -- -- 6 6 Max. 3.3 -- 17 17 11 -- -- -- 0.07 22 65 -- 0.3 18 18 Unit mA Vrms dB dB dB dB dB dB % Vrms k V V mV mV Conditions Through mode THD = 1%, through mode Through mode fIN = 50Hz, vocal fader mode -- fIN = 1kHz fIN = 1kHz Vocal fader mode Through mode, BW: 400Hz to 30kHz Rg = 0, DIN AUDIO LIN, RIN, MICIN, FK -- -- Pin 15 switching Pin 16 switching 2 Multimedia ICs BA3836 *Measurement circuit 4.7V A A 51k 1 A 51k 51k 0.3V 1 C7 0.22 C6 C5 10 0.047 1 16 C 15 B 14 A 13 Rout 12 LP 11 LP 10 LP 9 RIN Vcc 1 MIC IN 2 LOUT 3 FK 4 TK 5 LIN 6 BIAS 7 GND 8 A 1 C1 10 C2 10 C3 C4 22 V 1k 10 100k V V AUDIO ANALYZER MEASUREMENT FK L R MIC 600 OSC 51k Fig.1 3 Multimedia ICs BA3836 *Circuit operation 14, B: pin 15, C: pin 16) Mode table (A: pin A 0 0 0 0 1 1 1 1 B 0 0 1 1 0 0 1 1 C 0 1 0 1 0 1 0 1 LOUT MUTE VF L L KC KC KC KC ROUT MUTE VF L R KC KC KC KC TK MUTE VF L L R VF L L+R Mute Vocal fader Sound multiplexing Through Sound multiplexing Vocal fader Sound multiplexing L+R MODE 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 - COM 51k 1 51k 1 51k 1 0.22 10 0.047 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 TAPE,CD LD,etc. 1k 1 POWER AMP 10 Key-con MICROPHONE + MICROPHONE Fig.2 *Operation notes the application circuit design, but rec- *External dimensions (Units: mm) (1) We guarantee 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. 19.4 0.3 16 9 6.5 0.3 1 0.51Min. 3.2 0.2 4.25 0.3 8 7.62 0.3 0.1 2.54 0.5 0.1 0 ~ 15 DIP16 5 |
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