LTC1068IG 데이터 시트보기 (PDF) - Linear Technology

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LTC1068IG

Clock-Tunable, Quad Second Order, Filter Building Blocks

Linear Technology 

LTC1068 Series

TYPICAL APPLICATIONS

LTC1068-50 8th Order Linear Phase Lowpass, fCUTOFF = fCLK/50

for Single Supply Low Power Applications. Maximum fCUTOFF is

20kHz with a 3.3V Supply and 40kHz with a 5V Supply

VIN

3.3V

1µF

RA1

56.2k

RB1

13.3k

R11

22.6k

R21 20.5k

R31 10k

R41 22.6k

1

INV B

2

HPB/NB

3

BPB

4

LPB

28

INV C

27

HPC/NC

26

BPC

25

LPC

5

SB

24

SC

6

LTC1068-50

NC

V–

23

7

AGND

22

NC

0.1µF

8 V+

9

NC

21

CLK

20

NC

R43 48.7k

R33 12.7k

R23 10.7k

10

SA

11

LPA

12

BPA

13

HPA/NA

19

SD

18

LPD

17

BPD

16

HPD/ND

14

INV A

15

INV D

RL3

26.7k

RB3 24.9k

RL2

9.09k

RH2

34k

R22 43.2k

R32 43.2k

R42 196k

R44 34.8k

R34 14.3k

R24 16.9k

500kHz

VOUT

1068 TA11

10

0

–10

–20

–30

–40

–50

–60

–70

–80

1

Gain and Group Delay

vs Frequency

150

140

GAIN

130

120

110

GROUP

DELAY

100

90

80

70

10

FREQUENCY (kHz)

60

100

1068 TA12

FilterCAD Custom Inputs for fC = 10kHz

2nd ORDER SECTION f0 (kHz)

Q

B

9.5241 0.5248

C

11.0472 1.1258

A

11.0441 1.3392

D

6.9687 0.6082

fN (kHz)

21.7724

QN

0.5248

1.5781

TYPE

AP

LPN

LPBP

LP

MODE

4a3

2n

2s

3

1068fc

20

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