BA3853 Ver la hoja de datos (PDF) - ROHM Semiconductor
Número de pieza
componentes Descripción
Fabricante
BA3853 Datasheet PDF : 11 Pages
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Audio ICs
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 2.2MΩ or less.
Set the circuit time constant as follows:
BA3853BFS
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)
t
V = Vreg EXP (* CR12 / (R1)R2) )
(2) When the switch is off (fall)
t
V = Vreg (1 * EXP ( * R1C2 ))
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
1
1
fc1 = 2πC1R1 = 2πC1 20kΩ
(2) Treble filter cutoff frequency
High-pass filter side
1
1
fc2 = 2πC2R2 = 2πC2 10kΩ
Low-pass filter side
1
1
fc3 = 2πC3R3 = 2πc3 100pF 20kΩ
= 80kHz
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.
799
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