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PDF BA3570FS Data sheet ( Hoja de datos )
| Número de pieza | BA3570FS | |
| Descripción | ALS headphone driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Audio ICs
ALS headphone driver
BA3570F / BA3570FS
The BA3570F and BA3570FS are stereo headphone amplifiers with ALS (Auto Loudness System) which have been
designed for use as headphone drivers in audio equipment.
FApplications
Stereo headphones
FFeatures
1) The use of ALS (Auto Loudness System) makes it
possible to obtain a dynamic sound regardless of the
volume level.
2) Built-in power mute circuit.
3) Built-in bypass circuit.
FBlock diagram
554
1 page  
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
: GV(D) = 20log
: GV(MUTE) = 0
R14
R13
(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
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet BA3570FS.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| BA3570F | ALS headphone driver | ROHM Semiconductor |
| BA3570FS | ALS headphone driver | ROHM Semiconductor |
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