8

LTC1062

1062fd

AC Coupling an External CMOS Clock Powered

FB

AGND

DIVIDER

RATIO

OUT

1

2

3

4

8

7

6

5

LTC1062

0.01µF

0

1062 TA03

C

100k

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

to Improve the High Frequency Attenuation Floor

FB

AGND

DIVIDER

RATIO

OUT

1

2

3

4

8

7

6

5

LTC1062

1062 TA04

C

C1

0.01C

R

R1

10R

–

+

EXTERNAL

BUFFER

Filtering AC Signals from High DC Voltages

FB

AGND

DIVIDER

RATIO

OUT

1

2

3

4

8

7

6

5

LTC1062

1062 TA05

C

0.01µF

C

0.01µF

12R

309.6k

R

25.8k

DC OUTPUT

EXAMPLE:

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

FOR THE AC SIGNALS RIDING ON THE DC

HIGH DC INPUT = 100V

0.01

–1.4

–1.0

–0.6

0.2

0.1

1

1062 TA06

–0.2

–1.2

–0.8

0

–0.4

Passband Amplitude Response for the

High DC Accurate 5th Order Filter

TYPICAL APPLICATIO S