BH3868BFS-E2 Rohm Semiconductor, BH3868BFS-E2 Datasheet - Page 19

• Manufacturer Part Number: BH3868BFS-E2
• Description: IC AUD SOUND PROCESS SSOP-A32 TR
• Manufacturer: Rohm Semiconductor
• Type: Volume Controlr

Specifications of BH3868BFS-E2

• Applications: Automotive Audio
• Mounting Type: Surface Mount
• Package / Case: 32-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Audio ICs
(2) Setting of Attack Time and Release Time
In this IC, the Attack Time and Release Time can be set in the boost side and cut side of AGC separately.
The Attack Time and Recovery Time shall be set by a resistor in IC and external capacitor and resistor. The internal
resistance is R
If the constant of capacitor C
voltage. Moreover, the distortion rate also changes and becomes worse.
If the constant of capacitor C
increases, the suppression is reduced.
! ! ! ! SURROUND
(1) Setting of Frequency Characteristic
This IC has an output terminal (4pin) for the surround signal. The surround characteristic can be varied by adding an
appropriate filter to this terminal. An example of characteristic that low-pass filter has been set is shown below :
An amplifier to define the sound effect.
C
1µ
1
Attack Time
Recovery Time
R1
+
=430Ω and R
LS1
Detector circuit of suppression
+
−
430
2
1Meg
R
R
R1
L1
2
1
R2
of LS2 decreases, an amplification starting point is shifted in a direction of smaller input
of LS1C
: R
: R
=20KΩ (Typ).
R1
L1
10k
R
0.0047µ
× C
1
× C
4.7k
1
1
1
decreases, the distortion rate becomes worse. If the resistance value of R
SOUT
4
R
C
2
A
A
2
1
+
−
f
2
Frequency [Hz]
1µ
C
2
Attack Time
Recovery Time
+
Detector circuit of amplification
LS2
20k
3
1Meg
R
R
R2
L2
f
1
: R
: R
R2
L2
× C
× C
f
f
A
A
1
2
2
1
2
BH3868BFS
2
=
=
=
= 1
2πC(R
2πCR
R
1
1
R
+ R
2
2
1
1
2
+ R
2
)
19/27
L1