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LTC1069-7

Linear Phase

8th Order Lowpass Filter

FEATURES

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8th Order, Linear Phase Filter in SO-8 Package

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Raised Cosine Amplitude Response

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– 43dB Attenuation at 2

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Wideband Noise: 140

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Operates from Single 5V Supply to

±5V Power Supplies

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Clock-Tunable to 200kHz with

±5V Supplies

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Clock-Tunable to 120kHz with Single 5V Supply

cutoff frequency of the LTC1069-7 is set by an external

clock and is equal to the clock frequency divided by 25.

The ratio of the internal sampling frequency to the cutoff

frequency is 50:1 that is, the input signal is sampled twice

per clock cycle to lower the risk of aliasing. The LTC1069-

7 can be operated from a single 5V supply up to dual

±5V

supplies.

The gain and phase response of the LTC1069-7 can be

used in digital communication systems where pulse shap-

ing and channel bandwidth limiting must be carried out.

Any system that requires an analog filter with linear phase

and sharper roll off than conventional Bessel filters can

use the LTC1069-7.

The LTC1069-7 has a wide dynamic range. With

±5V

signal-to-(noise + THD) ratio is

≥ 60dB. The wideband

noise of the LTC1069-7 is 140

LTC1069-X filters, the typical passband gain of the

LTC1069-7 is equal to –1V/V.

The LTC1069-7 is available in an SO-8 package.

Other filter responses with lower power/speed specifica-

tions can be obtained. Please contact LTC Marketing.

AGND

NC

NC

CLK

LTC1069-7

5V

0.47

µF

0.1

µF

1069-7 TA01

Frequency Response

Single 5V Supply, Linear Phase 100kHz Lowpass Filter

The LTC

phase, 8th order lowpass filter. The amplitude response

of the filter approximates a raised cosine filter with an

alpha of one. The gain at the cutoff frequency is – 3dB and

the attenuation at twice the cutoff frequency is 43dB. The

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Digital Communication Filter

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Antialiasing Filter with Linear Phase

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Smoothing Filters

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

FREQUENCY (kHz)

10

–70

–60

–50

–40

–30

10

100

1000

1069-7 TA02

–20

–10

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