LTC1062CN8(RevD) 查看數據表（PDF） - Linear Technology

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LTC1062CN8
(Rev.:RevD)

5th Order Lowpass Filter

Linear Technology 

LTC1062

5th Order Lowpass Filter

FEATURES

■ Lowpass Filter with No DC Error

■ Low Passband Noise

■ Operates DC to 20kHz

■ Operates On a Single 5V Supply or Up to ±8V

■ 5th Order Filter

■ Maximally Flat Response

■ Internal or External Clock

■ Cascadable for Faster Rolloff

■ Buffer Available

U

APPLICATIO S

■ 60Hz Lowpass Filters

■ Antialiasing Filter

■ Low Level Filtering

■ Rolling Off AC Signals from High DC Voltages

■ Digital Voltmeters

■ Scales

■ Strain Gauges

TYPICAL APPLICATIO

10Hz 5th Order Butterworth Lowpass Filter

25.8k

VIN

V– = –5V

1µF

1

FB

2

AGND

8

BOUT

7

OUT

DC ACCURATE

OUTPUT

BUFFERED

OUTPUT

LTC1062

3 V–

V+ 6

4

5

DIVIDER COSC

RATIO

COSC=

3900pF

V+ = 5V

1062 TA01

NOTE: TO ADJUST OSCILLATOR FREQUENCY,

USE A 6800pF CAPACITOR IN SERIES

WITH A 50k POT FROM PIN 5 TO GROUND

DESCRIPTIO

The LTC®1062 is a 5th order all pole maximally flat

lowpass filter with no DC error. Its unusual architecture

puts the filter outside the DC path so DC offset and low

frequency noise problems are eliminated. This makes the

LTC1062 very useful for lowpass filters where DC accuracy

is important.

The filter input and output are simultaneously taken across

an external resistor. The LTC1062 is coupled to the signal

through an external capacitor. This RC reacts with the

internal switched capacitor network to form a 5th order

rolloff at the output.

The filter cutoff frequency is set by an internal clock that

can be externally driven. The clock-to-cutoff frequency

ratio is typically 100:1, allowing the clock ripple to be

easily removed.

Two LTC1062s can be cascaded to form a 10th order quasi

max flat lowpass filter. The device can be operated with

single or dual supplies ranging from ±2.5V to ±9V.

The LTC1062 is manufactured using Linear Technology’s

enhanced LTCMOSTM silicon gate process.

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

LTCMOS is a trademark of Linear Technology Corporation.

Filter Amplitude Response and Noise

0

COSC = 3900pF

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

1

10

INPUT FREQUENCY (Hz)

50

40

30

20

10

0

100

1062 TA02

1062fd

1

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