参数资料
型号: LTC1563-3IGN#TRPBF
厂商: Linear Technology
文件页数: 8/20页
文件大小: 0K
描述: IC FILTER LP RC 4TH ORDER 16SSOP
标准包装: 2,500
滤波器类型: 巴特沃斯,低通开关电容器
频率 - 截止或中心: 256kHz
滤波器数: 1
滤波器阶数: 4th
电源电压: 2.7 V ~ 11 V,±2.7 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-SSOP
包装: 带卷 (TR)
16
LTC1563-2/LTC1563-3
156323fa
TYPICAL APPLICATIO S
U
100kHz, 6th Order Pseudo-Butterworth
Frequency Response
TEXTBOOK BUTTERWORTH
PSEUDO-BUTTERWORTH
fO1 = 100kHz
Q1 = 1.9319
fO1 = 100kHz Q1 = 1.9319
fO2 = 100kHz
Q2 = 0.7071
fO2 = 100kHz Q2 = 0.7358
fO3 = 100kHz
Q3 = 0.5176
fO3 = 100kHz Real Poles
fO4 = 100kHz Real Poles
The complex, 2nd order section of the textbook design
with the lowest Q is replaced with two real first order poles.
The Q of another section is slightly altered such that the
final filter’s response is indistinguisable from a textbook
Butterworth response.
The fO and Q values listed above can be entered in
FilterCAD’s Enhanced Design window as a custom re-
sponse filter. After entering the coefficients, FilterCAD will
produce a schematic of the circuit. The procedure is as
follows:
1. After starting FilterCAD, select the Enhanced Design
window.
2. Select the Custom Response and set the custom FC to
1Hz.
3. In the Coefficients table, go to the Type column and click
on the types listed and set the column with two LP types
and two LP1 types. This sets up a template of a 6th order
filter with two 2nd order lowpass sections and two 1st
order lowpass sections.
4. Enter the fO and Q coefficients as listed above. For a
Butterworth filter, use the same coefficients as the
example circuit above except set all of the fO to 1Hz.
5. Set the custom FC to the desired cutoff frequency. This
will automatically multiply all of the fO coefficients. You
have now finished the design of the filter and you can
click on the frequency response or step response
buttons to verify the filter’s response.
6. Click on the Implement button to go on to the filter
implementation stage.
7. In the Enhanced Implement window, click on the Active
RC button to choose the LTC1563-2 part. You are now
done with the filter’s implementation. Click on the
schematic button to view the resulting circuit.
Other Pseudo Filter Response Coefficients (All fO Are Normalized for a 1Hz Filter Cutoff)
BESSEL
0.1dB RIPPLE CHEBYSHEV
0.5dB RIPPLE CHEBYSHEV
TRANSITIONAL GAUSSIAN TO 12dB
TRANSITIONAL GAUSSIAN TO 6dB
fO1
1.9070
1.0600
1.0100
2.1000
1.5000
Q1
1.0230
3.8500
5.3000
2.2000
2.8500
fO2
1.6910
0.8000
0.7200
1.2500
1.0500
Q2
0.6110
1.0000
1.2000
0.8000
0.9000
fO3
1.6060
0.6000
0.5000
1.2500
0.9000
fO4
1.6060
1.0000
0.8000
1.2500
0.9000
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
3.3V
VIN
1563 TA07
R31
17.8k
R32
20.5k
R22
28.7k
R21
32.4k
0.1
F
LTC1563-2
0.1
F
C12
560pF
C11
560pF
RA2 3.16k
RB2 25.5k
RA1 3.16k
RB1 29.4k
FREQUENCY (Hz)
10k
GAIN
(dB)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
100k
1M
1563 TA07a
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