m62420afp Renesas Electronics Corporation., m62420afp Datasheet - Page 6

• Manufacturer Part Number: m62420afp
• Description: 2ch Electronic Volume With Tone By Ic Bus System
• Manufacturer: Renesas Electronics Corporation.

M62420SP/ FP/ AFP
Function Explanation
(1) Equivaration Circuit of Tone Control
The resonance circuit is able to construct by using built-in amplifier for simulated inductor. (Shows the constant as
follow)
Rev.1.0, Sep.17.2003, page 6 of 16
ref
C1
C2
FIG2. The equivalent circuit used L.
L
FIG1.
(=1.8K )
C1
The circuit used simurated inductor.
R1
ref
(=136K )
R3
R2
R3
SIMAMP
Incide IC
FIG1 is equal to FIG2.
The following relation is concluded.
Center frequency
f0 = 1 / 2
Q =
( EX ) BASS band
L=C2 ER1 ER2
R1=1.8K , R2=136K
C1=0.47µF , C2=0.022µF
( C2 R2 ) / ( C1 R1 )
C1 C2 R1 R2 [Hz]
( f=100Hz )