m62421fp Renesas Electronics Corporation., m62421fp Datasheet - Page 6

• Manufacturer Part Number: m62421fp
• Description: Tone And Volume Controller With 2 Line Control
• Manufacturer: Renesas Electronics Corporation.

M62421SP/FP
Function Explanation
Equivalent Circuit of Tone Control
The resonance circuit is able to construct by using built-in amplifier for simulated inductor. (Shows the constant as
follow)
Center frequency:
Example:
Figure1 is equal to figure2.
The following relation is concluded.
REJ03F0208-0201 Rev.2.01 Mar 31, 2008
Page 6 of 13
f0 = 1 / 2π
Q =
L = C2 • ER1 • ER2
BASS band (f ≈ 100 Hz)
R1 = 1.8 kΩ, R2 =117 kΩ
C1 = 0.47 µ, C2 = 0.022 µ
(C2 • R2) / (C1 • R1)
C1 • C2 • R1 • R2 [Hz]
C1
C2
ref
Figure 1 The circuit used simulated inductor
Figure 2 The equivalent circuit used L
L
( = 1.8 kΩ)
R1
ref
C1
( = 117 kΩ)
R3
R2
–
+
R3
Inside IC
SIMAMP