LTC1264CS Datasheet

IC型号：
LTC1264CS
PDF描述：
Linear Technology [High Speed, Quad Universal Filter Buildi...
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LTC1264

High Speed, Quad Universal

Filter Building Block

FEATURES

DESCRIPTIO

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

卤2.37V

卤8V

Power Supplies

Customized Version with Internal Resistors Available

Low Noise

Low Harmonic Distortion

The LTC

庐

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

鈮?/div>

5 and for T

< 85掳C, the maximum center

frequency is 160kHz. For Q

鈮?/div>

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.

APPLICATI

Digital Communications

Spread Spectrum Communications

Spectral Analysis

Loran Receivers

Instrumentation

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

TYPICAL APPLICATI

50k

10k

HPB/NB

50k

BPB

MAXIMUM POWER

CENTER

SUPPLY

160kHz

卤7.5V

120kHz

卤5V

60kHz

Single 5V

0.1碌F

LPB

AGND

LPA

50k

BPA

10k

HPA/NA

INV A

50k

INV B

Clock-Tunable 8th Order Bandpass Filter, f

CENTER

= f

CLK

/20

50k

INV C

10k

HPC/NC

50k

BPC

LPC

LTC1264

鈥?/div>

CLK

LPD

BPD

HPD/ND

10k

INV D

50k

1264 TA01

Gain vs Frequency

100kHz Bandpass, f

鈥?dB

Bandwidth = f

CENTER

/10

鈥?0

GAIN (dB)

鈥?0

CLK

0.1碌F

OUT

50k

鈥?0

10k

100k

FREQUENCY (Hz)

1264 TA02

型号

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