LTC1062(RevD) 查看數據表（PDF） - Linear Technology

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LTC1062
(Rev.:RevD)

5th Order Lowpass Filter

Linear Technology 

TYPICAL APPLICATIO S

LTC1062

7th Order 100Hz Lowpass Filter with Continuous Output Filtering, Output Buffering and Gain Adjustment

R3

R4

2.6k

R1

R2

VIN

1µF

C1

1

FB

2

AGND

8

BOUT

7

OUT

LTC1062

–5V 3 V–

V+ 6 5V

5V 4 DIVIDER COSC 5 10kHz

RATIO

CLK IN

5V

2

–

7

LTC1052

3+

4

C2

1

0.1µF

6

8

0.1µF

–5V

VOUT

1062 TA13

THE LTC1052 IS CONNECTED AS A 2ND ORDER SALLEN AND KEY LOWPASS FILTER WITH A CUTOFF

FREQUENCY EQUAL TO THE CUTOFF FREQUENCY OF THE LTC1062. THE ADDITIONAL FILTERING

ELIMINATES ANY 10kHz CLOCK FEEDTHROUGH PLUS DECREASES THE WIDEBAND NOISE OF THE FILTER

DC OUTPUT OFFSET (REFERRED TO A DC GAIN OF UNITY) = 5µV MAX

WIDEBAND NOISE (REFERRED TO A DC GAIN OF UNITY) = 60µVRMS

OUTPUT FILTER COMPONENT VALUES

DC GAIN R3 R4 R1 R2 C1

C2

1

∞ 0 14.3k 53.6k 0.1µF 0.033µF

10 3.57k 32.4k 46k 274k 0.01µF 0.02µF

Single 5V Supply 5th Order LP Filter

10µF

5V VIN

SOLID

TANTALUM 25k

25k

R

C

1

FB

2

AGND

8

BOUT

7

BUFFERED

OUTPUT

OUT

LTC1062

3 V–

V+ 6 5V

5V 4 DIVIDER COSC 5 CLK

RATIO

DC ACCURATE

C OUTPUT

12R

1062 TA14

FOR A 10Hz FILTER: R = 29.4k, C = 1µF, fCLK = 1kHz

THE

FILTER

IS

MAXIMALLY

FLAT

FOR

1

2πRC

=

fC

1.84

1062fd

11

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