LTC1064-1

6

10641fa

TYPICAL APPLICATIO S

Transitional Elliptic-Bessel Dual 5th Order Lowpass Filter

Transient Response to a 2V Step

Input VOUT1

0.1ms/DIV

1V/DIV

1V/DIV

0.1ms/DIV

LTC1064-1

1

2

3

4

5

6

7

14

13

12

11

10

9

8

V+

V–

fCLK = 200

× f–3dB

1064 TA06

0.1µF

0.1µF

VOUT1

VIN2

C

47.5k

–

+

LT1056

C

47.5k

C =

(µF)

5

f–3dB

OUTPUT1 WIDEBAND NOISE: 50µVRMS

OUTPUT2 WIDEBAND NOISE: 110µVRMS

R(h, I)

COMP2*

V–

fCLK

NC

VOUT

NC

INV C

VIN

AGND

V+

AGND

COMP1*

INV A

VOUT2

VIN1

Amplitude Response

fIN (kHz)

1

15

0

–15

–30

–45

–60

–75

–90

–105

10

100

1064 TA09

VOUT2

VOUT1

f–3dB = 5kHz

fCLK = 1MHz

Adding an Output Buffer-Filter to Eliminate Any Clock Feedthrough

Over a 10:1 Clock Range, for fCLK = 2kHz to 20kHz

LTC1064-1

1

2

3

4

5

6

7

14

13

12

11

10

9

8

V+

V–

1064 TA10

0.1µF

0.1µF

VOUT

–

+

LT1056

200pF

430pF

4.99k

4.99k

50Ω

10k

0.027µF

R(h, I)

COMP2*

V–

fCLK

NC

VOUT

NC

INV C

VIN

AGND

V+

AGND

COMP1*

INV A

VIN

Transient Response to a 2V Step

Input VOUT2