ba3853bfs ROHM Co. Ltd., ba3853bfs Datasheet - Page 9

• Manufacturer Part Number: ba3853bfs
• Description: Stereo Sound Controller Ic
• Manufacturer: ROHM Co. Ltd.

FExternal components
(1)
Select the values for the mute and loudness on / off pin
components to suit the product that you are designing.
The value of the resistor should be 2.2M or less.
Set the circuit time constant as follows:
(2)
The filter circuits are built using passive components,
and the resistors for both the bass and treble filters are
on the chip. Construct the circuits shown below.
Filter cutoff frequencies
The circuits given above have the following frequency
characteristics.
Audio ICs
Mute and loudness circuit components
External filter circuits
When using a switch as illustrated in the circuit diagram,
set the values for C and R in the time-constant circuit as
follows:
(1) When the switch is on (rise)
(2) When the switch is off (fall)
V: pin 3 or pin 4 voltage
(1) Bass filter cutoff frequency
(2) Treble filter cutoff frequency
High-pass filter side
Low-pass filter side
The tone control circuit is designed to give a change of
cut at the peak and bottom of the frequency characteris-
tic. Design the filter with due consideration to the fre-
quency characteristics. The values for the filter given in
the application circuit have been selected to give suffi-
cient boost and cut at f = 100Hz and f = 10kHz.
V = Vreg EXP (*
V = Vreg (1 * EXP ( *
fc
fc
fc
15dB (Typ.) for the frequency that you wish to boost or
1
2
3
=
=
=
2 C
2 C
2 C
1
1
1
1
2
3
R
R
R
1
2
3
=
=
=
CR
2 c
2 C
2 C
1
2
3
1
2
/ (R
1
1
100pF 20k
t
20k
10k
R
1
1
)R
t
1
C
2
2
)
))
BA3853BFS
)
= 80kHz
799