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LTC1563-3IGN データシート(PDF) 14 Page - Linear Technology

部品番号 LTC1563-3IGN
部品情報  Active RC, 4th Order Lowpass Filter Family
PDF  20 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LTC1563-3IGN データシート(HTML) 14 Page - Linear Technology

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LTC1563-2/LTC1563-3
156323fa
Table 2. Resistor Values, Normalized to 256kHz Cutoff Frequency (fC), Figure 6. The Passband
Gain, of the 4th Order LTC1563-3 Lowpass Filter, Is Set to Unity. (Note 1)
TRANSITIONAL
TRANSITIONAL
BESSEL
GAUSSIAN TO 6dB
GAUSSIAN TO 12dB
LP Mode Max fC
25.6kHz
20kHz
21kHz
HS Mode Max fC
256kHz
175kHz
185kHz
R11 = R21 =
10k(256kHz/fC)
17.4k(256kHz/fC)
15k(256kHz/fC)
R31 =
10k(256kHz/fC)
13.3k(256kHz/fC)
11.8k(256kHz/fC)
R12 = R22 =
10k(256kHz/fC)
14.3k(256kHz/fC)
10.5k(256kHz/fC)
R32 =
10k(256kHz/fC)
6.04k(256kHz/fC)
6.19k(256kHz/fC)
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
VOUT
LTC1563-3
VIN
1563 F06
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
–20
–40
–60
–80
–90
10
0
10
1
1563 F06a
NORMALIZED TO fC = 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
1.2
1.0
0.8
0.6
0.4
0.2
0
1.0
0.5
1.5
2.0
1563 F06b
2.5
3.0
BESSEL
TRANSITIONAL
GAUSSIAN TO 12dB
TRANSITIONAL
GAUSSIAN TO 6dB
NORMALIZED TO fC = 1Hz
TIME (s)
0
2.0
1563 F06c
0.5
1.0
1.5
1.05
1.00
0.95
BESSEL
TRANSITIONAL
GAUSSIAN TO 12dB
TRANSITIONAL
GAUSSIAN TO 6dB
NORMALIZED TO fC = 1Hz
APPLICATIONS INFORMATION



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