參數(shù)資料
型號: LTC1563-3
廠商: Linear Technology Corporation
英文描述: Active RC, 4th Order Lowpass Filter Family(有源RC 4階低通濾波器)
中文描述: 有源RC,四階低通濾波器系列(有源區(qū)局4階低通濾波器)
文件頁數(shù): 14/20頁
文件大?。?/td> 269K
代理商: LTC1563-3
14
LTC1563-2/LTC1563-3
Table 2. Resistor Values, Normalized to 256kHz Cutoff Frequency (f
C
), Figure 6. The Passband
Gain, of the 4th Order LTC1563-3 Lowpass Filter, Is Set to Unity. (Note 1)
TRANSITIONAL
GAUSSIAN TO 6dB
20kHz
175kHz
17.4k(256kHz/f
C
)
13.3k(256kHz/f
C
)
14.3k(256kHz/f
C
)
6.04k(256kHz/f
C
)
TRANSITIONAL
GAUSSIAN TO 12dB
21kHz
185kHz
15k(256kHz/f
C
)
11.8k(256kHz/f
C
)
10.5k(256kHz/f
C
)
6.19k(256kHz/f
C
)
BESSEL
25.6kHz
256kHz
10k(256kHz/f
C
)
10k(256kHz/f
C
)
10k(256kHz/f
C
)
10k(256kHz/f
C
)
LP Mode Max f
C
HS Mode Max f
C
R11 = R21 =
R31 =
R12 = R22 =
R32 =
Note 1:
The resistor values listed in this table provide good approximations of the listed transfer functions. For the
optimal resistor values, higher gain or other transfer functions, use FilterCAD Version 3.0 (or newer) or contact the
Linear Technology Filter Applications group for assistance.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LP
SA
NC
INVA
NC
LPA
AGND
V
V
+
LPB
NC
INVB
NC
SB
NC
EN
V
OUT
LTC1563-3
V
IN
1563 F04
R31
R32
R22
R21
R11
R12
Figure 6. 4th Order Filter Connections (Power Supply, Ground,
EN and LP Connections Not Shown for Clarity). Table 2 Shows
Resistor Values
FREQUENCY (Hz)
0.1
G
–20
–40
–60
–80
–90
10
0
10
1
1563 F04a
NORMALIZED TO f
C
= 1Hz
BESSEL
TRANSITIONAL
GAUSSIAN TO 12dB
TRANSITIONAL
GAUSSIAN TO 6dB
4th Order Filter Responses Using the LTC1563-3
Figure 6a. Frequency Response
Figure 6b. Step Response
Figure 6c. Step Response—Settling
TIME (s)
0
O
1.2
1.0
0.8
0.6
0.4
0.2
0
1.0
0.5
1.5
2.0
1563 F04b
2.5
3.0
BESSEL
TRANSITIONAL
GAUSSIAN TO 12dB
TRANSITIONAL
GAUSSIAN TO 6dB
NORMALIZED TO f
C
= 1Hz
TIME (s)
0
O
2.0
1563 F04c
0.5
1.0
1.5
1.05
1.00
0.95
BESSEL
TRANSITIONAL
GAUSSIAN TO 12dB
TRANSITIONAL
GAUSSIAN TO 6dB
NORMALIZED TO f
C
= 1Hz
APPLICATIO
S I
N
FOR
ATIO
U
W
U
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