M62421FP 查看數據表（PDF） - Renesas Electronics

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产品描述 (功能)

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M62421FP

Tone and Volume Controller with 2 Line Control

Renesas Electronics 

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)

Inside IC

R3

C1

R1

C2

( = 1.8 kΩ)

–

+

R2

( = 117 kΩ)

SIMAMP

ref

Figure 1 The circuit used simulated inductor

Center frequency:

f0 = 1 / 2π

C1 • C2 • R1 • R2 [Hz]

Q = (C2 • R2) / (C1 • R1)

Example: BASS band (f ≈ 100 Hz)

R1 = 1.8 kΩ, R2 =117 kΩ

C1 = 0.47 µ, C2 = 0.022 µ

ref

L

C1

R3

Figure 2 The equivalent circuit used L

Figure1 is equal to figure2.

The following relation is concluded.

L = C2 • ER1 • ER2

REJ03F0208-0201 Rev.2.01 Mar 31, 2008

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