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BA3570FS 数据表(PDF) 6 Page - Rohm

部件名 BA3570FS
功能描述  ALS headphone driver
Download  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  ROHM [Rohm]
网页  http://www.rohm.com
标志 ROHM - Rohm

BA3570FS 数据表(HTML) 6 Page - Rohm

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R8+R9
fCH2 =
2
π S (R6R8+R8R10+R6R10) S C10
:
(Hz)
R13
GV(D) = 20log
R13+R14
(dB)
R9
GH1 = 20log
R8+R9
+9.5+15
(dB)
R9
GH2 = 20log
R6 //R8+R9
+9.5+15
(dB)
R18
GV(ATT2) = 20log
R17+R18
(dB)
R19+R20
GV(D) = 20log
R19
(dB)
GV (OFF) = GV (ATT2) +GV (D) +GV (MUTE) +GV (E) = 15
(dB)
15
*6
)60
559
Audio ICs
BA3570F / BA3570FS
HPF cutoff
frequency 2
Amp D gain :
Furthermore, as R14 = 2R13,
GV(D) = +9.5 (dB)
The total gain GH1 for the frequency band f
tfCH1 is
and the total gain GH2 for the frequency band fCH2
tf is
3) Combined frequency characteristics
As shown in Fig. 6, the ALS characteristics can be ob-
tained from the bass characteristics (Fig. 4) and the
treble characteristics (Fig. 6).
(2)
ALS OFF
The signal circuit when ALS is off is shown in Fig. 7.
The gain and cutoff frequency of each block is as follows:
ATT2 attenuation:
Amp D’ gain:
As R17 = R18 and R19 = R20, the total gain GV(OFF) when ALS
is off is
and it is flat as shown in Fig. 8.


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