LTC1069-7 데이터 시트보기 (PDF) - Linear Technology

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LTC1069-7

Linear Phase 8th Order Lowpass Filter

Linear Technology 

LTC1069-7

Linear Phase

8th Order Lowpass Filter

FEATURES

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

n Raised Cosine Amplitude Response

n – 43dB Attenuation at 2× fCUTOFF

n Wideband Noise: 140μVRMS

n Operates from Single 5V Supply to

±5V Power Supplies

n Clock-Tunable to 200kHz with ±5V Supplies

n Clock-Tunable to 120kHz with Single 5V Supply

APPLICATIONS

n Digital Communication Filter

n Antialiasing Filter with Linear Phase

n Smoothing Filters

DESCRIPTION

The LTC®1069-7 is a monolithic, clock-tunable, linear

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

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

shaping 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

supplies and an input range of 0.1VRMS to 2VRMS, the

signal-to-(noise + THD) ratio is ≥ 60dB. The wideband noise

of the LTC1069-7 is 140μVRMS. UnlikeotherLTC1069-Xfilters,

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 specifications

can be obtained. Please contact LTC Marketing.

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

TYPICAL APPLICATION

Single 5V Supply, Linear Phase 100kHz Lowpass Filter

0.47μF

5V

0.1μF

AGND

VOUT

V+

V–

LTC1069-7

NC

NC

VIN VIN

CLK

VOUT

fCLK = 2.5MHz

1069-7 TA01

10

0

–10

–20

– 30

– 40

–50

– 60

–70

10

Frequency Response

100

FREQUENCY (kHz)

1000

1069-7 TA02

10697fa

1

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