LTC1059

1

1059fd

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Sinewave Oscillators

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Sweepable Bandpass/Notch Filters

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Full Audio Frequency Filters

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Tracking Filters

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All Filter Parameters

Guaranteed Over Temperature

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Wide Center Frequency Range (0.1Hz to 40kHz)

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Low Noise, Wide Dynamic Range

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Guaranteed Operation for ±2.37V and ±5V Supply

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Low Power Consumption

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Guaranteed Clock-to-Center Frequency Accuracy of

0.8%

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Guaranteed Low Offset Voltages Over Temperature

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Very Low Center Frequency and Q Tempco

■

■

Separate Highpass (or Notch or Allpass), Bandpass,

Lowpass Outputs

High Performance

Switched Capacitor Universal Filter

The LTC

mance, active filter building block and an uncommitted op

amp. The filter building block together with an external

clock and 2 to 5 resistors can produce various 2nd order

functions which are available at its three output pins. Two

out of three always provide lowpass and bandpass func-

tions while the third output pin can produce notch or

highpass or allpass. The center frequency of these func-

tions can be tuned from 0.1Hz to 40kHz and is dependent

on an external clock or an external clock and a resistor

ratio. The filter can handle input frequencies up to 100kHz.

The uncommitted op amp can be used to obtain additional

allpass and notch functions, for gain adjustment or for

cascading techniques.

Higher than 2nd order filter functions can be obtained by

cascading the LTC1059 with the LTC1060 dual universal

filter or the LTC1061 triple universal filter. Any classical

filter realization (such as Butterworth, Cauer, Bessel and

Chebyshev) can be formed.

The LTC1059 can be operated with single or dual supplies

ranging from ±2.37V to ±8V (or 4.74V to 16V single

supply).

The LTC1059 is manufactured by using Linear Technology’s

enhanced LTCMOS

Wide Range 2nd Order Bandpass/Notch Filter with Q = 10

1059 TA01a

1

2

3

4

5

6

7

14

13

12

11

10

9

8

–8V

8V

LTC1059

NOTCH OUT

BP OUT

50k

50k

7.15k

DC-200kHz

BP

N/AP/HP

INV1

S1

LSh

LP

INV2

AGND

50/100/HOLD

CLK

TYPICAL APPLICATIO

APPLICATIO S

FEATURES

DESCRIPTIO

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

LTCMOS trademark of Linear Technology Corporation.

Center Frequency and Q Error

IDEAL CENTER FREQUENCY (kHz)

0

10

20

25

45

1058 TA01b

515

30

35

40

1.2

1.0

0.8

0.6

0.4

0.2

0

30

25

20

15

10

5

0

CLOCK

CENTER FREQUENCY

35.35

1

=

CENTER

FREQUENCY

ERROR

Q ERROR