BA3570F Ver la hoja de datos (PDF) - ROHM Semiconductor
Número de pieza
componentes Descripción
Fabricante
BA3570F Datasheet PDF : 10 Pages
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Audio ICs
1) Bass signal transmission and gain vs. frequency
BA3570F / BA3570FS
2) Treble signal transmission and gain vs.
frequency
The gain and cutoff frequency of each block is as follows:
1
LPF1 cutoff frequency : fCL1=
2π S (R3//R4) S C4
(Hz)
Amp A gain
: GV(A) = 0
(dB)
ATT attenuation
Amp B gain
Amp B cutoff
frequency
: GV(ATT) = 20log
: GV(B) = 20log
EVR
R10)EVR
R7)R11
R7
(dB)
(dB)
: fCL3 =
1
2π S R7 S C11
(Hz)
LPF2 cutoff frequency : fCL2 =
1
2π S R12 S C12
Amp C gain
: GV(C) = 0
(Hz)
(dB)
Amp D gain
Mute switch gain
R14
: GV(D) = 20log
R13
: GV(MUTE) = 0
(dB)
(dB)
Amp E gain
R15+R16
: GV(E) = 20log
(dB) z15dB
R15
In this case, R3 = R4 = 2SR12 (= 100kΩ) and C4 = C12 (=
0.1µF), therefore fCL1 = fCL2 (= 32Hz), and the frequency
characteristic is bass boost (*12 dB / OCT) as shown in
Fig. 4. Also, R14 = 2SR13, therefore GV(D) = 6 (dB) and the
EVR MAX total gain GLMAX when signals are input from
both channels is
GLMAX = GV(A)+GV(B)+GV(C)+GV(D)
GLMAX = +GV(MUTE)+GV(E)
GLMAX = GV(B)+6+15 (dB)
The gain and cutoff frequency of each block is as follows:
HPF cutoff : fCH1 =
1
frequency 1
2π S (R6+R8) S C10
(Hz)
558
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