Datasheet BA3836 Datasheet (ROHM)

Page 1
1
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
Features
1) Vocal fader functions (erase vocals from commer-
cially available music software) all on one chip.
2) Has internal secondary active LPF to enable a high-
degree 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) Key controller input and internal switches.
5) Internal microphone amplifier.
6) Low noise and low distortion.
7) Few external components.
Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits Unit Power supply voltage Power dissipation Operating temperature Storage temperature
V
CC Max.
Pd Topr Tstg
18
1000
1
– 40 ~ + 85
– 55 ~ + 125
V
mW
°C °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 Symbol UnitMax.Typ.Min.
Power supply voltage
V
CC 5.4 10—V
Page 2
2
Multimedia ICs BA3836
Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 10V, fIN = 1kHz, VIN = 150mV, RL = 100kΩ)
Parameter Symbol Min. Typ. Max. Unit
I
Q 1.6 2.6 3.3 mA
V
om 2.3 2.8 Vrms
G
VT 10 14 17 dB
G
VF 10 14 17 dB
G
VM 5 8 11 dB
CT 54 70 dB
MU 74 80 dB
SV 27 33 dB
THD 0.02 0.07 %
V
N 15 22 Vrms
R
IN 35 50 65 k
VthH 4.7 V
VthL 0.3 V
DCB 6 18 mVDCC 6 18 mV
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
Output switching DC differential
Control pin threshold (high)
Control pin threshold (low)
Conditions
Through mode THD = 1%, through mode Through mode f
IN = 50Hz, vocal fader mode
f
IN = 1kHz
f
IN = 1kHz
Vocal fader mode Through mode, BW: 400Hz to 30kHz Rg = 0, DIN AUDIO LIN, RIN, MICIN, FK
Pin 15 switching Pin 16 switching
Block diagram
SW2
LOGIC
SW1
+
+
SW3
R
L + R
L – R
L
–+
–+
+
–+
+
SW4
123456 7+8
16 15 14 13 12 11 10 9
CB AR
OUT LP LP LP RIN
VCC MIC LOUT FK TK LIN BIAS GND
Page 3
3
Multimedia ICs BA3836
Measurement circuit
C B A Rout LP LP LP RIN
Vcc MIC IN LOUT FK TK LIN BIAS GND
12 34 56 7 8
51k
51k
1µ
51k
1µ
0.22µ
0.047µ
10µ
22µ10µ
1µ
4.7V
0.3V
C7
C5
C4
C3
C6
10µ
C2
1µ
C1
RL
FK
MIC
10µ
51k
600
OSC
100k
MEASUREMENT
AUDIO
ANALYZER
V
1k
A
A
A
A
V
V
13
12
14 11
10
915
16
Fig.1
Page 4
4
Multimedia ICs BA3836
Circuit operation
Mode table (A: pin 14, B: pin 15, C: pin 16)
Mute Vocal fader Sound multiplexing Through Sound multiplexing Vocal fader Sound multiplexing L + R
A B C
0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1
LOUT ROUT TK MUTE
VF
L
L KC KC KC KC
MUTE
VF
L
R KC KC KC KC
MUTE
VF
L L R
VF
L
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.
Page 5
5
Multimedia ICs BA3836
1µ
10µ
10µ
0.047µ
0.22µ
1k
1µ
µ - COM
51k
1µ
51k
1µ
51k
POWER
AMP
MICROPHONE
MICROPHONE
Key-con
TAPE,CD
LD,etc.
12 3456
7
8
+
13
121411 10 91516
Fig.2
Operation notes (1) We guarantee the application circuit design, but rec­ommend 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.
Application example
DIP16
0.51Min.
0.3
± 0.1
916
81
6.5 ± 0.3
3.2
±
0.2
4.25
±
0.3
0.5 ± 0.1
19.4 ± 0.3
2.54
0° ~ 15°
7.62
External dimensions (Units: mm)
Loading...