Multimedia ICs
Vocal fader IC
BA3837 / BA3837F / BA3838F
The BA3837, BA3837F and BA3838F are ICs with an internal secondary active LPF for vocal cancellation functions and mixing amplifier functions with high degrees of vocal cancellation. Three control pins are used to switch between modes: the key controller input mode, through mode, vocal fader mode, sound multiplexing mode and mute mode. By offering these functions on a single chip, these ICs can significantly reduce the number of external components.
•Applications
Karaoke functions on stereo systems, portable stereos and VCRs
•Features
1)Single-chip IC with vocal fader, to erase vocals from commercially available recordings.
2)Internal secondary active LPF for high degrees of vocal cancellation (high synchronization rejection).
3)Three control pins for switching between 4 modes: through, vocal fader, sound multiplexing and mute.
•Absolute maximum ratings (Ta = 25°C)
4)Key controller input and internal switches.
5)Low noise and low distortion.
6)Internal microphone mixing amplifier.
7)Available in two packages: DIP 16-pin and SOP 16pin (BA3838F is available in SOP 16-pin only).
Parameter |
Symbol |
Limits |
Unit |
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Power supply voltage |
VCC |
18 |
V |
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Power |
DIP16 |
Pd |
1000 1 |
mV |
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dissipation |
SOP16 |
550 2 |
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Operating temperature |
Topr |
– 40 ~ + 85 |
°C |
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Storage temperature |
Tstg |
– 55 ~ + 125 |
°C |
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1 Reduced by 10 mW for each increase in Ta of 1°C over 25°C.
2 Reduced by 5.5mW for each increase in Ta of 1°C over 25°C.
•Recommended operating conditions (Ta = 25°C)
Parameter |
Symbol |
Min. |
Typ. |
Max. |
Unit |
Conditions |
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Power supply voltage 1 |
VCC |
5.4 |
— |
10 |
V |
Ta = – 40°C ~ + 85°C |
Power supply voltage 1 |
VCC |
5.4 |
— |
13 |
V |
Ta = – 40°C ~ + 60°C |
Power supply voltage 2 |
VCC |
4.0 |
— |
15 |
V |
Ta = 25°C |
1 BA3837 and BA3837F
2 BA3838F
1
Multimedia ICs |
BA3837 / BA3837F / BA3838F |
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•Block diagram
C |
B |
A |
ROUT |
LP |
LP |
LP |
RIN |
16 |
15 |
14 |
13 |
12 |
11 |
10 |
9 |
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– |
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– + |
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LOGIC |
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– + |
+ |
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R |
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L + R |
+ |
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SW2 |
SW1 |
– |
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– + |
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L – R + |
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L |
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+ – |
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+ – |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
VCC |
MIC |
LOUT |
FK |
TK |
LIN |
BIAS |
GND |
2
Multimedia ICs |
BA3837 / BA3837F / BA3838F |
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•Pin descriptions |
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Pin No. |
Pin name |
Equivalent circuit |
Function |
1 |
VCC |
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VCC |
1 VCC |
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2 |
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51k |
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2 |
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Mixing input pin for microphone sound |
2 |
MIC IN |
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VCC |
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VCC |
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20k |
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3 |
20k |
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3 |
LOUT |
Lch output pin |
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VCC |
1 |
VCC |
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2 |
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51k |
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4 |
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4 |
FK |
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Input pin for key controller signals |
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BA3837 / BA3837F |
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VCC |
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VCC |
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5 |
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5 |
TK |
BA3838F |
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Output pin for key controller signals |
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VCC |
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VCC |
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5
400
3
Multimedia ICs |
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BA3837 / BA3837F / BA3838F |
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Pin No. |
Pin name |
Equivalent circuit |
Function |
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VCC |
1 |
VCC |
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2 |
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51k |
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6 |
LIN |
6 |
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L signal input pin |
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VCC |
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VCC |
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51k |
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7 |
BIAS |
7 |
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Signal bias circuit pin |
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51k |
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8 |
GND |
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VCC |
1 |
VCC |
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2 |
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51k |
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9 |
RIN |
9 |
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R signal input pin |
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VCC |
11 |
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10.4k |
10.4k |
10 |
LPF1 |
10 |
LPF time constant pin |
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VCC |
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10.4k |
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11 |
10.4k |
11 |
LPF2 |
LPF time constant pin |
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10 |
4
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