lc75421m Sanyo Semiconductor Corporation, lc75421m Datasheet - Page 19

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lc75421m

Manufacturer Part Number
lc75421m
Description
Electronic Volume Controller For Cars
Manufacturer
Sanyo Semiconductor Corporation
Datasheet

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• Calculation example 2
Simulation Results
Specification Mean frequency: f0 = 40 Hz
14 dB
12 dB
10 dB
Setting
We obtain R3 from G = 12 dB.
We obtain C2 from mean frequency f0 = 40 Hz.
8 dB
6 dB
4 dB
2 dB
C2
G
R3
f 0
+12 dB
2
(2 f0)
10
f = 100 Hz
20 LOG
11.73
10.29
G/20
R2
8.74
7.11
5.41
3.65
1.85
R3R2C1C2
Gain during maximum boost: G = 12 dB
Let us use R1 = 0 kΩ, R2 = 45.054 kΩ, C1 = 2.2 uF, and C1 >> C2.
2
–1
1
R2R3 C1
1
10
f = 1 kHz
3.98 – 1
4.27
4.07
3.78
3.38
2.82
2.09
1.15
45054
R2
R3
(2
R3
40)
15 K
2
45054 15000 (2.2 10
1
LC75421M
–6
)
0.01 F
No. 6866-19/24

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