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BA3853BFS Folha de dados(PDF) 9 Page - Rohm

Nome de Peças BA3853BFS
Descrição Electrónicos  Stereo sound controller IC
Download  11 Pages
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Fabricante Electrônico  ROHM [Rohm]
Página de início  http://www.rohm.com
Logo ROHM - Rohm

BA3853BFS Folha de dados(HTML) 9 Page - Rohm

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799
Audio ICs
BA3853BFS
FExternal components
(1)
Mute and loudness circuit components
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
Ω or less.
Set the circuit time constant as follows:
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
(2)
External filter circuits
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.
(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
±15dB (Typ.) for the frequency that you wish to boost or
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 (
*
t
CR12 /(R1
)R2)
)
V = Vreg (1
* EXP ( *
t
R1C2
))
fc1 =
1
2
πC1 20kΩ
1
2
πC1R1
=
fc2 =
1
2
πC2 10kΩ
1
2
πC2R2
=
fc3 =
1
2
πc3 100pF 20kΩ
1
2
πC3R3
=
= 80kHz


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