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参数资料
| 型号： | LC75397E |
| 元件分类： | 音频控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP64 |
| 封装： | QFP-64 |
| 文件页数： | 14/26页 |
| 文件大小： | 578K |
| 代理商： | LC75397E |
3. F3/F4 band circuits
The F3 band circuit supports peaking characteristics and the F4 band circuit supports shelving characteristics.
(1) Peaking characteristics (F3 band)
The external capacitor is used to construct a simulated inductor. This section presents the equivalent circuit and the
formulas for determining the desired center frequency.
(a) Simulated inductor equivalent circuit
(b) Sample calculation
Specifications: 1) Center frequency: f0 = 107 Hz
2) Q at maximum boost: Q+10dB = 0.8
(1) Determine the sharpness, Q0, of the simulated inductor itself.
Q0 = (R1 + R4) / R1 × Q+10dB ≈ 4.270
(2) Determine C1.
C1 = 1/2
πf0R1Q0 ≈ 0.536 (F)
(3) Determine C2.
C2 = Q0 / 2πf0R2 ≈ 0.021 (F)
(c) Reference values for C1 and C2
(2) Shelving characteristics (F4 band)
Gains of ±10 dB (in 2-dB steps) with respect to a target frequency can be achieved by using an external capacitor C3 with
a calculated according to the formula F shown below.
No. 6108-21/26
LC75397E
Z0: Impedance at resonance
(F3 band)
(F4 band)
Center frequency f0 (Hz)
C1 (F)
C2 (F)
107
0.536
0.021
340
0.169
6663P
1070
0.054
2117P
3400
0.017
666P
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