QFP64E Просмотр технического описания (PDF) - SANYO -> Panasonic
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производитель
QFP64E Datasheet PDF : 10 Pages
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LC75281E
• Center frequency (fo)
Band
f1
f2
f3
f4
f5
f6
f7
f8
f9
f10
f11 External capacitor (µF)
Low
31.5
40
50
63
80
100
125
160
200
250
315
0.047
Low mid 160
200
250
315
400
500
630
800
1 k 1.25 k 1.6 k
0.0094
High mid 630
800
1 k 1.25 k 1.6 k
2k
2.5 k 3.15 k
4k
5 k 6.3 k
0.00235
High
1.6 k
2k
2.5 k 3.15 k
4k
5k
6.3 k
8k
10 k 12.5 k 16 k
0.0094
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.
Figure a
The value of the external capacitor C is determined by substituting the desired center frequency in the following formula.
1
Rb//Rf
Cf = 2π Rf fo max • Ra + (Rb//Rf)
fo max: Corresponds to 315 Hz in the low band row in the preceding table.
Equivalent Circuit for Cf calculation
• Gain: 13 positions in 2-dB steps
•Q
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q 0.404 0.667 1.41 2.15 2.87 4.32 5.76 8.65
OCT
3
2
1
2/3
1/2
1/3
1/4
1/6
No. 5913-6/10
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