LTC1068-50CG View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC1068-50CG

Clock-Tunable, Quad Second Order, Filter Building Blocks

Linear Technology 

LTC1068 Series

TYPICAL APPLICATIONS

LTC1068-25 8th Order Order Bandpass, fCENTER = fCLK/32,

Passband –3dB at (0.965)(fCENTER) and (1.35)(fCENTER).

Maximum fCENTER = 80kHz with ±5V Supplies

RH1 118k

RB2 47.5k

R11 121k

VIN

R21 4.99k

R31 97.6k

R61

R51

8.87k 4.99k

5V

0.1µF

R63 6.49k

R53

4.99k

R33 124k

R23 4.99k

RL3

78.7K

1 INV B

2

HPB/NB

28

INV C

27

HPC/NC

3 BPB

4 LPB

BPC 26

LPC 25

5 SB

SC 24

6 NC LTC1068-25 V– 23

7

AGND

NC 22

8 V+

21

CLK

9 NC

10 SA

NC 20

19

SD

11 LPA

LPD 18

12 BPA

BPD 17

13

HPA/NA

14 INV A

16

HPD/ND

15

INV D

R22 4.99k

R32 130k

R52

4.99k R62 9.53k

0.1µF

R64 6.98k

R54

4.99k

R34 102k

R24 4.99k

–5V

320kHz

1068 TA23

VOUT

Gain vs Frequency

10

0

–10

–20

–30

–40

–50

–60

–70

7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5

FREQUENCY (kHz)

1068 TA24

FilterCAD Custom Inputs for fC = 10kHz

2nd ORDER SECTION f0 (kHz)

Q

TYPE

B

10.2398 15.6469 BP

C

10.3699 21.1060 BP

A

9.6241 18.6841

LP

D

9.7744 15.6092

LP

MODE

1b

1b

1b

1b

1068fc

26

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