LTC1062(RevD) Ver la hoja de datos (PDF) - Linear Technology

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LTC1062
(Rev.:RevD)

5th Order Lowpass Filter

Linear Technology 

LTC1062

TYPICAL APPLICATIO S

AC Coupling an External CMOS Clock Powered

from a Single Positive Supply, V+

VIN

C

VOUT

1

FB

2

AGND

8

BOUT

7

OUT

LTC1062

V– 3 V–

4

V+ 6

5

V+ 0.01µF

V+

DIVIDER COSC

RATIO

0

100k

1062 TA03

Adding an External (R1, C1) to Eliminate the Clock Feedthrough and

to Improve the High Frequency Attenuation Floor

R

VIN

C

1

FB

2

AGND

8

BOUT

7

OUT

LTC1062

V– 3 V–

V+ 6

4

5

DIVIDER COSC

RATIO

–

R1

EXTERNAL

10R

BUFFER

+

C1

0.01C

V+

fCLK

1062 TA04

VOUT

Filtering AC Signals from High DC Voltages

R

25.8k

VIN

HIGH DC INPUT = 100V

V– = –5V

C

0.01µF

1

FB

2

AGND

8

BOUT

7

OUT

LTC1062

3 V–

V+ 6

4

5

DIVIDER COSC

RATIO

DC OUTPUT

C

0.01µF

12R

309.6k

CLK IN = fC • 100

V+ = 5V

1062 TA05

EXAMPLE:

fCLK = 100KHz, fC = 1kHz. THE FILTER ACCURATELY PASSES

THE HIGH DC INPUT AND ACTS AS 5TH ORDER LP FILTER

FOR THE AC SIGNALS RIDING ON THE DC

8

Passband Amplitude Response for the

High DC Accurate 5th Order Filter

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

–1.2 VS = ±5V

fCLK = 100kHz

–1.4

0.01

0.1

fIN/fC

1

1062 TA06

1062fd

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