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 on stereo systems, portable stereos and VCRs
Karaoke functions
•
Features IC with vocal fader, to erase vocals from
1) Single-chip
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.
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 16-
pin (BA3838F is available in SOP 16-pin only).
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Power
dissipation
DIP16
SOP16
Symbol
V
CC
Pd
Topr
Tstg
Limits
18
1000
∗
1
550
∗
2
– 40 ~ + 85
– 55 ~ + 125
Unit
V
mV
°C
°C
Operating temperature
Storage temperature
∗
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
Power supply voltage
∗
1
Power supply voltage
∗
1
Power supply voltage
∗
2
Symbol
V
CC
V
CC
V
CC
Min.
5.4
5.4
4.0
Typ.
—
—
—
Max.
10
13
15
Unit
V
V
V
Conditions
Ta = – 40°C ~ + 85°C
Ta = – 40°C ~ + 60°C
Ta = 25°C
∗
1 BA3837 and BA3837F
∗
2 BA3838F
1
Multimedia ICs
BA3837 / BA3837F / BA3838F
•
Pin descriptions
Pin No.
1
Pin name
V
CC
V
CC
1
V
CC
2
51k
Equivalent circuit
Function
2
2
MIC IN
Mixing input pin for microphone sound
V
CC
V
CC
20k
20k
3
LOUT
3
Lch output pin
V
CC
1
V
CC
2
51
k
4
4
FK
Input pin for key controller signals
BA3837 / BA3837F
V
CC
V
CC
5
5
TK
BA3838F
V
CC
V
CC
Output pin for key controller signals
5
400
3
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