LTC1563-3IGN datasheet(16/20 Pages) LINER

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LTC1563-2/LTC1563-3

156323fa

TYPICAL APPLICATIO S

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

1.0230

3.8500

5.3000

2.2000

2.8500

fO2

1.6910

0.8000

0.7200

1.2500

1.0500

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

INVA

LPA

AGND

V–

V+

LPB

INVB

VOUT

3.3V

VIN

1563 TA07

R31

17.8k

R32

20.5k

R22

28.7k

R21

32.4k

0.1

µF

LTC1563-2

0.1

µF

C12

560pF

C11

560pF

RA2 3.16k

RB2 25.5k

RA1 3.16k

RB1 29.4k

FREQUENCY (Hz)

10k

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

100k

1563 TA07a

LTC1563-3IGN 数据表(PDF) 16 Page - Linear Technology

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