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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： | 11/26页 |
| 文件大小： | 578K |
| 代理商： | LC75397E |
External Capacitor Calculations
1. Bass circuit
The value of the external capacitor used by the LC75397E bass control can be calculated as shown in the example below.
Sample calculation: For a center frequency f0 of 39 Hz
Substitute the LC75397E internal resistors R1 and R2 shown below into the above formula.
This allows the value of the capacitor, C, to be calculated.
R1 = 1.3 k
R2 = 57.993 k
Assume C1 = C2 = C.
1
C = ——————
2
πf0 R1R2
1
C = ———————————
≠ 0.47 F
2
π × 39 × 1300 × 58000
Formula for calculating the gain:
R1 = 1.3 k
R2U = 1.476 k
R2L = 56.517 k
R1
R1 (R2U + R2L)
G = (—————)2 + (—————————————)2 = 3.16 = 10 dB
R1 + R2U
(R1 + R2U) R1 (R2U + R2L)
Formula for calculating Q:
R1 (R2U + R2L)
Q = ——————————————
≠ G
(R1 + R2U)
R1 (R2U + R2L)
No. 6108-19/26
LC75397E
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