ba3570fs ROHM Co. Ltd., ba3570fs Datasheet - Page 5

• Manufacturer Part Number: ba3570fs
• Description: Als Headphone Driver
• Manufacturer: ROHM Co. Ltd.

1) Bass signal transmission and gain vs. frequency
The gain and cutoff frequency of each block is as follows:
LPF1 cutoff frequency :
Amp A gain
ATT attenuation
Amp B gain
Amp B cutoff
frequency
LPF2 cutoff frequency :
Amp C gain
Amp D gain
Mute switch gain
558
Audio ICs
:
: G
:
:
: G
:
: G
f
G
G
f
G
CL1
CL2
f
CL3
V(ATT)
V(B)
V(D)
V(A)
V(C)
V(MUTE)
=
=
=
= 20log
= 20log
= 0
= 0
= 20log
2
2
= 0
2
S
(R3//R4)
S
S
R
R
1
1
12 S
1
7 S
R
R
10
7
C
R
C
R
EVR
)R
)EVR
S
11
R
12
14
13
C4
7
11
(Hz)
(Hz)
(dB)
(dB)
(dB)
(Hz)
(dB)
(dB)
(dB)
2) Treble signal transmission and gain vs.
Amp E gain
In this case, R
0.1 F), therefore f
characteristic is bass boost (*12 dB / OCT) as shown in
Fig. 4. Also, R
EVR MAX total gain G
both channels is
GLMAX = G
GLMAX =
GLMAX
The gain and cutoff frequency of each block is as follows:
HPF cutoff
frequency 1
frequency
= G
+G
:
V(A)
V(B)
V(MUTE)
f
14
CH1
3
+G
+6+15 (dB)
= R
= 2
=
V(B)
CL1
+G
S
4
R
+G
= 2
= f
13
2
V(E)
LMAX
, therefore G
BA3570F / BA3570FS
:
V(C)
CL2
G
S
S
R
(R
V(E)
12
+G
(= 32Hz), and the frequency
when signals are input from
6
1
+R
(= 100k ) and C
= 20log
V(D)
8
)
S
C
V(D)
10
R
= 6 (dB) and the
15
R
+R
15
(Hz)
16
4
(dB) z15dB
= C
12
(=