LTC1264 datasheet(1/16 Pages) LINER

Part #	LTC1264

Description	High Speed, Quad Universal Filter Building Block

PDF	16 Pages

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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1

LTC1264

1264fb

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

High Speed, Quad Universal

Filter Building Block

■ High Speed, Up to 250kHz Center Frequency

■ Four Identical Filters in a 0.3" Wide Package

■ Clock-to-Center Frequency Ratio of 20:1

■ Double-Sampling, Improved Aliasing

■ Operates from

±2.37V to ±8V Power Supplies

■ Customized Version with Internal Resistors Available

■ Low Noise

■ Low Harmonic Distortion

■ Available in 24-Pin DIP and SO Wide Packages

The LTC

®1264 consists of four identical, high speed 2nd

order switched-capacitor filter building blocks designed

for center frequencies up to 250kHz. Each building block,

together with three to five resistors, can provide 2nd order

functions like lowpass, highpass, bandpass and notch.

The center frequency of each 2nd order section is tuned via

an external clock. The clock-to-center frequency ratio is

internally set to 20:1, but it can be modified via external

resistors.

The aliasing performance of the LTC1264 is improved by

double-sampling each 2nd order section. Input signal

frequencies can reach up to twice the clock frequency

before any alias products will be detectable.

For Q

≤ 5 and for TA < 85°C, the maximum center

frequency is 160kHz. For Q

≤ 2, the maximum center

frequency is 250kHz. Up to 8th order filters can be realized

by cascading all four 2nd order sections.

A customized monolithic version of the LTC1264 includ-

ing internal thin film resistors can be obtained.

■ Digital Communications

■

Spread Spectrum Communications

■ Spectral Analysis

■ Loran Receivers

■

Instrumentation

50k

10k

50k

10k

IN

1264 TA01

OUT

INV B

HPB/NB

BPB

LPB

SB

AGND

V+

SA

LPA

BPA

HPA/NA

INV A

INV C

HPC/NC

BPC

LPC

SC

V–

CLK

SD

LPD

BPD

HPD/ND

INV D

50k

10k

50k

10k

50k

LTC1264

MAXIMUM

fCENTER

160kHz

120kHz

60kHz

POWER

SUPPLY

±7.5V

±5V

Single 5V

0.1

µF

fCLK

0.1

µF

Clock-Tunable 8th Order Bandpass Filter, fCENTER = fCLK/20

FREQUENCY (Hz)

10k

10

0

–10

–20

–30

–40

–50

–60

–70

–80

100k

1M

1264 TA02

Gain vs Frequency

100kHz Bandpass, f–3dB Bandwidth = fCENTER/10

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

All other trademarks are the property of their respective owners.

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