BD3870FS ROHM Co. Ltd., BD3870FS Datasheet - Page 15

• Manufacturer Part Number: BD3870FS
• Description: Audio Sound Processor For Home Audio
• Manufacturer: ROHM Co. Ltd.

●Thermal derating characteristics
13. Input Selector and Input Gain
12. Switching noise
MUTE setting example
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 V b e t o 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.
5
INPUT SOURCE
×C.
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
50
15/16
Ta [ ℃ ]
Fig.26
SERIAL DATA
Fig.25
75
500～600ms
100
125