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LTC1264

High Speed, Quad Universal Filter Building Block

Linear Technology 

LTC1264

High Speed, Quad Universal

Filter Building Block

FEATURES

■ 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

U

APPLICATIO S

■ Digital Communications

■ Spread Spectrum Communications

■ Spectral Analysis

■ Loran Receivers

■ Instrumentation

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

All other trademarks are the property of their respective owners.

DESCRIPTIO

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.

TYPICAL APPLICATIO

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

50k

50k

IN

10k

50k

MAXIMUM POWER

fCENTER SUPPLY

160kHz ±7.5V

120kHz ±5V

60kHz Single 5V

0.1µF

INV B

INV C

HPB/NB HPC/NC

BPB

BPC

LPB

LPC

SB

SC

LTC1264

AGND

V–

V+

CLK

SA

SD

10k

50k

fCLK

0.1µF

LPA

LPD

50k

OUT

BPA

10k

BPD

50k

HPA/NA HPD/ND

10k

INV A

INV D

50k

50k

1264 TA01

Gain vs Frequency

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

10

0

–10

–20

–30

–40

–50

–60

–70

–80

10k

100k

FREQUENCY (Hz)

1M

1264 TA02

1264fb

1

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