7

LTC1560-1

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.

Augmenting the LTC1560-1 for Improved Delay Flatness

Gain vs Frequency

1MHz Lowpass Filter Cascaded with a 30kHz 3rd Order Highpass Filter

FREQUENCY (kHz)

0.1

–60

–50

–40

–30

–20

–10

1

10

100

1000

10,000

1560-1 TA10

–70

–80

–90

–100

–110

0

10

–

+

–

+

–5V

5V

0.1

µF

0.1

µF

2.61k

560pF

560pF

560pF

3

1k

23.7k

2

4

8

1/2 LT1364

1

6

5

1/2 LT1364

7

0.1

µF

39pF

(OR – 5V)

0.01

µF

0.1

µF

0.01

µF

1560-1 TA09

560pF

GND

GND

1

4

3

2

8

5

6

7

SHDN

LTC1560-1

–

+

–

+

5V

2

6.49k

6.65k

49.9

Ω

22pF

0.1

µF

0.1

µF

22pF

9.75k

20k

40.2k

3

1/2 LT1364

1

6

5

4

8

5V

1/2 LT1364

–5V

7

0.1

µF

(OR – 5V)

0.01

µF

0.01

µF

0.1

µF

–5V

1560-1 TA05

GND

GND

1

4

3

2

8

5

6

7

SHDN

LTC1560-1

2-Level Eye Diagram of the Equalized Filter

2Mbps/s

1560-1 TA06