1
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
Absolute maximum ratings (Ta = 25C)
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.
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).
Parameter
Symbol
Limits
Unit
18
V
DIP16
Pd
mV
SOP16
Topr
C
Tstg
C
V
CC
1000
1
550
2
40 ~ + 85
55 ~ + 125
Power supply voltage
Power
dissipation
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 = 25C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
V
CC
5.4
--
10
V
V
CC
5.4
--
13
V
V
CC
4.0
--
15
V
Ta = 25
C
Ta = 40
C ~ + 85
C
Ta = 40
C ~ + 60
C
Conditions
Power supply voltage
1
Power supply voltage
1
Power supply voltage
2
2 BA3838F
1 BA3837 and BA3837F
3
Multimedia ICs
BA3837 / BA3837F / BA3838F
Pin descriptions
1
V
CC
2
MIC IN
3
LOUT
4
FK
5
TK
Pin No.
BA3837 / BA3837F
BA3838F
51k
20k
20k
51
k
400
5
5
4
3
2
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
1
2
V
CC
1
2
V
CC
V
CC
Pin name
Equivalent circuit
Function
Mixing input pin for microphone sound
Lch output pin
Input pin for key controller signals
Output pin for key controller signals
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