BH3852 ROHM [Rohm], BH3852 Datasheet - Page 8

• Manufacturer Part Number: BH3852
• Description: Sound control IC
• Manufacturer: ROHM [Rohm]

FOperation notes
(1)
As long as the operating power supply voltage range and
ambient temperature are kept within the specified range,
the basic circuits are guaranteed to function, but be sure
to check the constants as well as the element settings,
voltage settings, and temperature settings. Also, volume
curves sometimes depart from target values when there
is a combination of low temperature and reduced power.
(2)
(3)
618
Audio ICs
S The BPF is composed of a multifeedback active filter.
f
(theoretical equation)
o
can be varied according to the value of C.
Operating power supply voltage range
Primary amp
Bass filter
f
G =
(When R
f
O
O
=
=
5k
5.1 10
2
R
1
2
1
C
= 11.5k , R
* 6
1)
R
1
R
Q = 1.36 G = 8.5
2
1
C
C
C
2
1
2
1
= 85k , C
C
2
* 1
1
2
1
= C
2
= C)
Q
Note: Filter gain is calculated using the equation on the left. Total output gain is the
sum of the gain for each of the internal circuits.
R
2
R
C
1
1
C
2
S The input impedance is 47k .
S A buffer if R and C
S The gain can be set by R and the 20k .
Note: Set C
G
1
2
VC
= (R + 20k ) / R
gain) depending on the frequency band used.
(C
1)
C
2
2
(input coupling) and C
)
* 1
1
BH3852S / BH3852FS
are not present.
1
(used to set the