LTC1068-50CG 查看數據表（PDF） - Linear Technology

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LTC1068-50CG

Clock-Tunable, Quad Second Order, Filter Building Blocks

Linear Technology 

LTC1068 Series

APPLICATIONS INFORMATION

A Surface Mount Printed Circuit Layout

A very compact surface mount printed circuit layout can

be designed with 0603 size surface mount resistors,

capacitors and a 28-pin SSOP of the LTC1068 product

family. An example of a printed circuit layout is shown

in the following figures for an 8th order elliptic bandpass

filter. The total board area of this 8th order filter is 1" by

0.8". No attempt was made to design the smallest possible

printed circuit layout.

70kHz Elliptic Bandpass Filtter, fCENTER = fCLK/25 (Maximum fCENTER is 80kHz, VS = ±5V)

R21 4.99k

R11 29.4k

VIN

R31 24.9k

R41 20.5k

R51

4.99k

R61 11.3k

5V

C1

0.1µF

R43 43.2k

R33 59k

R23 4.99k

RL3

45.3K

RH1 28k

1 INV B

2

HPB/NB

28

INV C

27

HPC/NC

3 BPB

4 LPB

BPC 26

LPC 25

5 SB

U1

SC 24

6 NC LTC1068-25 V– 23

7

AGND

NC 22

8 V+

21

CLK

9 NC

10 SA

20

NC

19

SD

11 LPA

LPD 18

12 BPA

13 HPA/NA

14 INV A

BPD 17

16

HPD/ND

15

INV D

RH3 15.4k

RL2 23.2k

RH2 11.3k

R22 4.99k

R32 107k

R52

4.99k R62 56.2k

C2

0.1µF

R64 10k

R54

4.99k

R44 17.4k

R34 63.4k

R24 7.5k

1068 TA04

–5V

1.75MHz

VOUT

FilterCAD Custom Inputs for fC = 70kHz

2nd ORDER SECTION f0 (kHz)

Q

fN (kHz) TYPE MODE

B

67.7624 5.7236 58.3011 HPN 2b

C

67.0851 20.5500 81.6810 LPN 1bn

A

73.9324 15.1339 81.0295 LPN

2n

D

73.3547 16.3491

BP

2b

Gain vs Frequency

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

20 30 40 50 60 70 80 90 100

FREQUENCY (kHz)

1068 TA05

1068fc

17

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