LTC1569-6 datasheet, PDF - EEWORLD Datasheet

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LTC1569-6: DescriptionLinear Phase, DC Accurate, Low Power, 10th Order Lowpass Filter; File Size184KB，12 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC1569-6 Overview

Linear Phase, DC Accurate, Low Power, 10th Order Lowpass Filter

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Final Electrical Specifications

LTC1569-6

Linear Phase, DC Accurate,

Low Power, 10th Order Lowpass Filter

September 1999

FEATURES

One External R Sets Cutoff Frequency

Root Raised Cosine Response

3mA Supply Current with a Single 3V Supply

Up to 64kHz Cutoff on a Single 3V Supply

10th Order, Linear Phase Filter in an SO-8

DC Accurate, V

OS(MAX)

= 5mV

Low Power Modes

Differential or Single-Ended Inputs

80dB CMRR (DC)

82dB Signal-to-Noise Ratio, V

= 5V

Operates from 3V to

±5V

Supplies

tems.

Furthermore, its root raised cosine response offers

the optimum pulse shaping for PAM data communica-

tions.

The filter attenuation is 50dB at 1.5 • f

CUTOFF

, 60db

at 2 • f

CUTOFF

, and in excess of 80dB at 6 • f

CUTOFF

. DC-

accuracy-sensitive applications benefit from the 5mV

maximum DC offset.

APPLICATIO S

Data Communication Filters for 3V Operation

Linear Phase and Phase Matched Filters for I/Q

Signal Processing

Pin Programmable Cutoff Frequency Lowpass Filters

DESCRIPTIO

The LTC1569-6 sampled data filter does not require an

external clock yet its cutoff frequency can be set with a

single external resistor with a typical accuracy of 3.5% or

better.

The external resistor programs an internal oscilla-

tor whose frequency is divided by either 1, 4 or 16 prior to

being applied to the filter network. Pin 5 determines the

divider setting. Thus, up to three cutoff frequencies can be

obtained for each external resistor value. Using various

resistor values and divider settings, the cutoff frequency

can be programmed over a range of six octaves. Alterna-

tively, the cutoff frequency can be set with an external

clock and the clock-to-cutoff frequency ratio is 64:1. The

ratio of the internal sampling rate to the filter cutoff

frequency is 128:1.

The LTC1569-6 is fully tested for a cutoff frequency of

64kHz with a single 3V supply.

The LTC1569-6 features power saving modes and it is

available in an SO-8 surface mount package.

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

The LTC 1569-6 is a 10th order lowpass filter featuring

linear phase and a root raised cosine amplitude response.

The high selectivity of the LTC1569-6 combined with its

linear phase in the passband makes it suitable for filtering

both in data communications and data acquisition sys-

TYPICAL APPLICATIO

Single 3V Supply, 64kHz/16kHz/4kHz Lowpass Filter

3.48k

1µF

–

DIV/CLK

1/1

–

OUT

EXT

= 10k

1µF

1/16

1/4

GAIN (dB)

LTC1569-6

GND

EASY TO SET f

CUTOFF

1, 4 OR 16

64kHz (10k/R

EXT

)

1569-6 TA01

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

Frequency Response, f

CUTOFF

= 64kHz/16kHz/4kHz

–20

–40

–60

–80

100pF

–100

100

FREQUENCY (kHz)

1000

1569-6

TA01a

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