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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： | 13/26页 |
| 文件大小： | 578K |
| 代理商： | LC75397E |
2. F1/F2 band circuits
This section presents the equivalent circuit and the formulas used to calculate the external resistor and capacitor values to
provide a center frequency of 148 Hz.
F1/F2 band equivalent circuit
Sample calculation
Specifications: Center frequency: f0 = 148 Hz
Gain at maximum boost: G+10dB = 10 dB
Assume R1 = 51.8 k
and C1 = C2 = C.
(1) Determine R2 from the specification that G+10dB = 10 dB.
R1
G+10dB = 20 × LOG10 1 + ——
2R2
R1
51800
R2 = ————————
= ——————— = 11979.7
≠ 12 k
2 (10G+10dB/20 – 1)
2
× (3.162 – 1)
(2) Determine C from the specification that the center frequency f0 = 148 Hz.
1
f0 = ————————
2
πf R1R2C1C2
11
C = —————— = ——————————— = 0.0431
× 10–6 ≠ 0.044 F
2
πf0 R1R2
2
π × 148
51800
× 12000
(3) Determine Q.
C C R1
1
51800
Q = ————— ————— = ———————— = 1.039
2C
R1R2CC
2 51800
× 12000
No. 6108-20/26
LC75397E
()
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