Table 2. Resistor Values, Normalized to 256kHz Cutoff Frequency (fC
參數(shù)資料
型號: LTC1563-3IGN#TR
廠商: Linear Technology
文件頁數(shù): 6/20頁
文件大?。?/td> 0K
描述: IC FILTER LP RC 4TH ORDER 16SSOP
標準包裝: 2,500
濾波器類型: 巴特沃斯,低通開關電容器
頻率 - 截止或中心: 256kHz
濾波器數(shù): 1
濾波器階數(shù): 4th
電源電壓: 2.7 V ~ 11 V,±2.7 V ~ 5.5 V
安裝類型: 表面貼裝
封裝/外殼: 16-SSOP(0.154",3.90mm 寬)
供應商設備封裝: 16-SSOP
包裝: 帶卷 (TR)
14
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
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
GAIN
(dB)
–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
OUTPUT
VOLTAGE
(V)
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
OUTPUT
VOLTAGE
(V)
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
WU
U
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