10

LTC1164-6

11646fa

S

APPLICATI

TYPICAL

8th Order Elliptic Lowpass Filter (fCLK/fC) = 100:1

8th Order Linear Phase Lowpass Filter (fCLK/fC) = 160:1

8th Order 20kHz Cutoff, Elliptic Filter Operating with a Single 5V Supply and Driving 1k, 1000pF Load

THD + Noise vs Frequency

Gain vs Frequency

FREQUENCY (kHz)

1

5

1164-6 TA05

–40

–45

–50

–55

–60

–65

–70

–75

–80

–85

–90

10

VS = SINGLE 5V

IS = 5mA, 16TH ORDER

ELLIPTIC LOWPASS

VIN = 0.5VRMS

fCLK = 540kHz

fC = 10kHz

FREQUENCY (kHz)

1

10

1164-6 TA04

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

30

VS = SINGLE 5V

IS = 5mA, 16TH ORDER

ELLIPTIC LOWPASS

fCLK = 540kHz

fCUTOFF = 10kHz

Single 5V, 16th Order Lowpass Filter fCUTOFF = 10kHz

1

2

3

4

5

6

7

14

13

12

11

10

9

8

VIN

5V

fCLK

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

VOUT

+

VS = SINGLE 5V, IS = 5mA TYP

16TH ORDER LOWPASS FILTER

FIXED fCUTOFF, fCLK = 540kHz

fCUTOFF = 10kHz

(fCLK/fC) = 54:1

1/2

πR1C1 = 1/2πR2C2 = 2fCUTOFF

1

2

3

4

5

6

7

14

13

12

11

10

9

8

LTC1164-6

VIN

VOUT

fCLK

= 1MHz

5V

NOTES:

1. TOTAL SUPPLY CURRENT IS = 4mA

(EXCLUDING OUTPUT LOAD CURRENT)

2. FLAT PASSBAND UP TO 18kHz,

f–3dB = 20kHz

3. THD + NOISE

≤ –70dB,

1VP-P ≤ VIN ≤ 3VP-P, fIN = 1kHz

1164-6 TA09

1k

–

+

510pF

LT1200

0.1

µF

5V

10k

6.65k

0.1

µF

10k

51.1k

5V

2

3

4

7

5V

1000pF

1k

1

2

3

4

5

6

7

14

13

12

11

10

9

8

LTC1164-6

VIN

VOUT

fCLK

1164-6 TA07

V –

0.1

µF

0.1

µF

V+

1

2

3

4

5

6

7

14

13

12

11

10

9

8

LTC1164-6

VIN

VOUT

fCLK

1164-6 TA08

V –

0.1

µF

0.1

µF

V+