1

LTC1061

1061fe

INPUT FREQUENCY GAIN (kHz)

–100

–80

–60

–40

–20

0

10

20

30

40

1061 TA02

50

2kHz

fCLK = 1MHz

0

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

78.7k

4.99k

23.7k

4.99k

165k

5.49k

49.9k

V– = –7.5V

165k

4.99k

1k

9.31k

165k

VIN < 100kHz

7.5V

T2 CLK IN < 1.2MHz

V+ = 7.5V

1061 TA01

LTC1061

VOUT

■ Three Filters in a Single Package

■

Up to 6th Order Filter Functions

■ Center Frequency Range up to 35kHz

■ fO × Q Product up to 1MHz

■

Guaranteed Center Frequency and Q Accuracy Over

Temperature

■

Guaranteed Low Offset Voltages Over Temperature

■

90dB Signal-to-Noise Ratio

■ Operation from Single 4.7V Supply, Up to

±8V

■

Guaranteed Filter Specifications with

±5V Supply and

±2.37V Supply

■ Low Power Consumption with Single 5V Supply

■ Clock Inputs T

2L and CMOS Compatible

■

Available in 20-Pin DIP and 20-Pin SO Wide Package

, LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS

TM

is a trademark of Linear Technology Corporation. All other trademarks are the property of

their respective owners.

TYPICAL APPLICATIO

The LTC

®1061 consists of three high performance, univer-

sal filter building blocks. Each filter building block together

with an external clock and 2 to 5 resistors can produce

various second order functions which are available at its

three output pins. Two out of three always provide low-

pass and bandpass functions while the third output pin

can produce highpass or notch or allpass. The center

frequency of these functions can be tuned with an external

clock or an external clock and a resistor ratio. For Q < 5, the

center frequency ranges from 0.1Hz to 35kHz. For Qs of 10

or above, the center frequency ranges from 0.1Hz to

28kHz.

The LTC1061 can be used with single or dual supplies

ranging from

±2.37V to ±8V (or 4.74V to 16V). When the

filter operates with supplies of

±5V and above, it can

handle input frequencies up to 100kHz.

The LTC1061 is compatible with the LTC1059 single

universal filter and the LTC1060 dual. Higher than 6th

order functions can be obtained by cascading the LTC1061

with the LTC1059 or LTC1060. Any classical filter realiza-

tion can be obtained.

APPLICATIO S

DESCRIPTIO

FEATURES

High Performance Triple

Universal Filter Building Block

Amplitude Response

■ High Order, Wide Frequency Range Bandpass,

Lowpass, Notch Filters

■

Low Power Consumption, Single 5V Supply,

Clock-Tunable Filters

■ Tracking Filters

■

Antialiasing Filters

6th Order, Clock-Tunable, 0.5dB Ripple Chebyshev BP Filter