11

LTC1164-6

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

S

APPLICATI

TYPICAL

8th Order Low Power, Clock-Tunable Elliptic Filter with

Active RC Input Anti-Aliasing Filter and Output Smoothing Filter

1

2

3

4

5

6

7

14

13

12

11

10

9

8

5V

1164-6 TA03

LTC1164-6

1

µF

15k

10k

1

2

3

4

5

6

7

14

13

12

11

10

9

8

IC1

C1

0.01

µF

R1

789

Ω

5V

0.1

µF

1k

5V

0.1

µF

5V

IC2

LTC1164-6

R2

7.89k

C2

0.001

µF

+

16TH ORDER LOWPASS FILTER

1/2

Gain vs Frequency

FREQUENCY (kHz)

1

10

1164-6 TA04

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

30

ELLIPTIC LOWPASS

FREQUENCY (kHz)

1

5

1164-6 TA05

– 40

–45

– 50

–55

–60

–65

–70

–75

–80

–85

–90

10

IS = 5mA, 16TH ORDER

ELLIPTIC LOWPASS

THD + Noise vs Frequency

1

2

3

4

5

6

7

14

13

12

11

10

9

8

LTC1164-6

ATTENUATION AT 10kHz = –48dB

1164-6 TA10

0.1

µF

0.1

µF

–

+

1/2

LT1013

R3

5.62k

R2

76.8k

R1

1.15k

C3

0.001

µF

C2

0.022

µF

C1

0.1

µF

R2

97.6k

R1

16.9k

C2

0.001

µF

C1

0.0047

µF

ATTENUATION AT 10kHz = – 30dB

100Hz

10kHz

NOTES:

1. CLOCK-TUNABLE OVER ONE DECADE

OF CUTOFF FREQUENCY.

2. BOTH INPUT AND OUTPUT RC ACTIVE

FILTERS ARE 0.1dB CHEBYSHEV FILTERS

WITH 1kHz RIPPLE BANDWIDTH.

–

+

1/2

LT1013

Single 5V, 16th Order Lowpass Filter