lc75421m Sanyo Semiconductor Corporation, lc75421m Datasheet - Page 16

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

Treble Band Circuit
• Calculation example 1
Simulation Results
Specification Set frequency: f = 10000 Hz
14 dB
12 dB
10 dB
Setting
8 dB
6 dB
4 dB
2 dB
The shelving characteristics can be obtained for the treble band.
The equivalent circuit and calculation formula during boost are indicated below.
G
C
20 LOG
2 10000
2 f
f = 10 kHz
13.95
11.98
(
10
10
Gain during maximum boost: G
Let us use R1 = 11.030 kΩ and R2 = 45.054 kΩ.
The above constants are inserted in the following formula.
8
6
4
2
G/20
10
R2
(
5.01–1
1
45054
– 1
1
1
f = 1 kHz
)
7.42
6.96
6.34
4.43
3.13
1.64
2
5.5
– R1
)
R1
2
– 11030
2
2
R2
(1 / C)
2
2
6800(pF)
C
+ 14 dB
R1
LC75421M
= 14 dB
R2
No. 6866-16/24