參數(shù)資料
型號(hào): LC75281E
廠商: SANYO SEMICONDUCTOR CO LTD
元件分類: 音頻控制
英文描述: 2 CHANNEL(S), EQUALIZER CIRCUIT, PQFP64
封裝: QFP-64
文件頁數(shù): 7/10頁
文件大?。?/td> 85K
代理商: LC75281E
LC75281E
No.5913-6/10
(1) Center frequency (f0)
(Example 1)
Band
f1
f2
f3
f4
f5
f6
f7
f8
f9
f10
f11
External
capacitor (
μF)
Low
3.15
40
50
63
80
100
125
160
200
250
315
0.047
Low Mid
160
200
250
315
400
500
630
800
1k
1.25k
1.6k
0.0094
High Mid
630
800
1k
1.25k
1.6k
2k
2.5k
3.15k
4k
5k
6.3k
0.00235
High
1.6k
2k
2.5k
3.15k
4k
5k
6.3k
8k
10k
12.5k
16k
0.00094
External Capacitor Calculations
Figure a shows the LC75281E internal f0 control circuit. The center frequency f0 can be set to one of 11 frequencies in
1/3 octave steps by switching the resistors in the figure.
The value of an external capacitor is determined by substituting the desired center frequency in the following formula.
Cf =
f0 max: Corresponds to 315Hz in the low band row in the preceding table.
371
Ω
RON=3k
Ω
1249
Ω
1265
Ω
Cf
7k
Ω
1247
Ω
1262
Ω
972
Ω
792
Ω
666
Ω
494
Ω
366
Ω
1015
Ω
301
Ω
Figure a
Rb//Rf
Ra + (Rb//Rf)
1
2
π Rf f0 max
Cf
Ra
Rf
Equivalent Circuit for Cf calculation
Rb
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