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 commer-
1) Vocal fader
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)
5)
6)
7)
Key controller input and internal switches.
Internal microphone amplifier.
Low noise and low distortion.
Few external components.
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
Max.
Pd
Topr
Tstg
Limits
18
1000
∗
1
– 40 ~ + 85
– 55 ~ + 125
Unit
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
Power supply voltage
Symbol
V
CC
Min.
5.4
Typ.
—
Max.
10
Unit
V
1
Multimedia ICs
BA3836
•
Block diagram
C
16
B
15
A
14
R
OUT
13
LP
12
LP
11
LP
10
R
IN
9
LOGIC
–
+
–
+
– +
SW3
R
L+R
+
SW2
SW1
L–R
L
–
+
– +
SW4
+ –
+ –
1
V
CC
2
MIC
3
L
OUT
4
FK
5
TK
6
L
IN
7
BIAS
8
GND
•
Electrical characteristics (unless otherwise noted, Ta = 25°C, V
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
I
Q
V
om
G
VT
G
VF
G
VM
CT
MU
SV
THD
V
N
R
IN
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
CC
= 10V, f
IN
= 1kHz, V
IN
= 150mV, R
L
= 100kΩ)
Unit
mA
Vrms
dB
dB
dB
dB
dB
dB
%
Vrms
kΩ
V
V
mV
mV
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
2
Multimedia ICs
BA3836
•
Measurement circuit
4.7V
A
A
51k
1µ
A
51k
51k
0.3V
1µ
C7
0.22µ
C6
C5
10µ
0.047µ
1µ
16
C
15
B
14
A
13
Rout
12
LP
11
LP
10
LP
9
R
IN
Vcc
1
MIC IN
2
L
OUT
3
FK
4
TK
5
L
IN
6
BIAS
7
GND
8
A
1µ
C1
10µ
C2
10µ
C3
C4
22µ
V
1k
10µ
100k
V
V
AUDIO
ANALYZER
MEASUREMENT
FK
L
R
MIC
600Ω
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
µ
- COM
51k
1µ
51k
1µ
51k
1µ
0.22µ
10µ
0.047µ
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TAPE,CD
LD,etc.
1k
1µ
POWER
AMP
10µ
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 compo-
nent values, check both the static and transient charac-
teristics of the circuit, and allow sufficient margin in your
selections to take into account variations in the compo-
nents and ICs.
(2) The vocal fader works by canceling out the synchro-
nous component of the signal, leaving the low compo-
nents 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 con-
stant 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 recom-
mended 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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