BD3870FS-E2 Rohm Semiconductor, BD3870FS-E2 Datasheet - Page 14

• 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

●Thermal Derating Curve
BD3870FS,BD3871FS,BD3872FS,BD3873FS
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12) Switching noise
13) Input Selector and Input Gain
For Surround and Loud Speaker Equalizer (BD3872FS only), external capacitor C is attached to the CAP pin as a measures
to control the switching noise. In the application circuit, a constant value as an example, is indicated by the CAP pin.
The time constant, which is used to charge/discharge the external capacitor C (varying between Vbe to 5Vbe (2.65V)) on
the CAP pin, controls the soft switching operation. The switching time constant T is stated as T=2.55×10
Vbe has a temperature characteristic and may affect the time constant T.
When setting/changing Input Selector or Input Gain, the soft switching operation does not function and therefore noise is
not controlled. For this reason, it is recommended to provide a mute circuit constructed of the external components for the
set design.
MUTE setting example
INPUT SOURCE
SERIAL DATA
MUTE
(L=ON, H=OFF)
1200
1000
800
600
400
200
0
0
SSOP-A32
SSOP-A24
40～60ms
When installed ROHM standard board
(70×70×1.6mm Glass epoxy board)
25
Ambient Temperature: Ta(℃)
50
Fig.25
Fig.26
14/15
SERIAL DATA
75
500～600ms
100
125
Technical Note
2010.10 - Rev.A
5
×C.