lc75412e Sanyo Semiconductor Corporation, lc75412e Datasheet - Page 17

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lc75412e

Manufacturer Part Number
lc75412e
Description
Electronic Volume Controller For Car Audio Systems
Manufacturer
Sanyo Semiconductor Corporation
Datasheet

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F1/F3 Band Circuit
The equivalent circuit and the formula for calculating the external RC with a mean frequency of 1 kHz are shown below.
• F1/F3 band equivalent circuit block diagram
• Calculation example
Specification Mean frequency: f0 = 1 kHz
Gain during maximum boost: G
Let us use R1 = 0.665 kΩ, R2 = 58.704 kΩ, and C1 = C2 = C.
1. Calculate R3 with G
2. Calculate C with the center frequency f0 = 1 kHz
3. Calculate Q:
G
C
Q
R3 =
f =
+18 dB
0
=
=
2
2
(R1+R2)R3
f0
10
= 20 LOG
G/20
(R1+R2)R3C1C2
(R1+R2)R3
R2
1
1
– 1
1
+18 dB
– R1
10
= 18 dB:
1 +
=
R3(R1+R2)
(2R3+R1)
+18 dB
2
2R3+R1
2 = 3900
1000
R2
= 18 dB
C1
1
39359 3900
LC75412E, 75412W
1.789
R1
R3
R2
= 0.010 10
C2
–6
0.01 F
No. 7053-17/21

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