BD3870FS-E2 Rohm Semiconductor, BD3870FS-E2 Datasheet - Page 9

• Manufacturer Part Number: BD3870FS-E2
• Description: IC SOUND PROCESSOR SSOP-A24
• Manufacturer: Rohm Semiconductor
• Series: -r
• Type: Audio Processorr

Specifications of BD3870FS-E2

• Applications: Audio Systems
• Mounting Type: Surface Mount
• Package / Case: 24-SOP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

●Description of operations
BD3870FS,BD3871FS,BD3872FS,BD3873FS
© 2010 ROHM Co., Ltd. All rights reserved.
www.rohm.com
1) Bass filter
Using external components, center frequencies and Q factors of the bass characteristics are flexible
Standard values of R3, R4 (reference)
(R1=5.6kΩ, R2=390kΩ, C1=C2=0.1µF)
* The actual boost cut amount may deviate from the standard values in some degree.
Bass Boost Cut Amount
IN
10dB
12dB
14dB
0dB
2dB
4dB
6dB
8dB
C1
R3
Fig.5
R2
R1
+
-
R4
C2
Resistance (kΩ) * Typ.
77.64
58.90
44.02
32.20
22.82
15.36
9.44
4.78
R3
18.73
33.60
45.42
54.80
62.26
68.18
72.84
R4
0
9/15
f
0
Q
G(boost)


G
2 π
cut
R1
R2
R1R2R4C1C2
G



R1R2

C1
20log
20log
R3

R2
C2


R3

1
R4
R1
R1

R3
R1
R1

R2(R3


R2
R2
R4
R2



R2
R2
R2R3


R4


Fig.6
R3
R3
C1C2
R3
R2R3


F0

R3
R3
R4



R4
R4
R4


(Hz)


R4
R4



Technical Note
2010.10 - Rev.A
C2
C2
C1
C1






C2
C2
C1
C1
1
1
( dB)


1
1
G
G
(dB)
f