LTC1064 Просмотр технического описания (PDF) - Linear Technology

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LTC1064

Low Noise, Fast, Quad Universal Filter Building Block

Linear Technology 

LTC1064

TYPICAL APPLICATIO S

8th Order Clock-Sweepable Lowpass Elliptic Antialiasing Filter

RH1

RL1

RH2

RL2

1 INV B

INV C 24

R11

VIN

R22

2 HPB/NB HPC/NC 23

R21

R32

3 BPB

BPC 22

R31

R42

4 LPB

LPC 21

R41

5 SB

SC 20

6 AGND

V– 19

–7.5V

7.5V

7 V+ LTC1064 CLK 18 fCLK ≤ 2MHz

0.1µF

0.1µF

8 SA

50/100 17 –7.5V

R43

9 LPA

LPD 16

R44

R33

10 BPA

BPD 15

R34

R23

11 HPA/NA

HPD 14

R24

12 INV A

INV D 13

RL3

VOUT

RH3

RESISTOR VALUES:

R11 = 19.1k R21 = 10k

R22 = 10k

R23 = 11.3k

R24 = 15.4k

R31 = 13.7k

R32 = 23.7k

R33 = 84.5k

R34 = 15.2k

R41 = 15.4k

R42 = 10.2k

R43 = 10k

R44 = 42.7k

RL1 = 14k

RL2 = 26.7k

RL3 = 10k

RH1 = 30.9k

RH2 = 76.8k

RH3 = 60.2k

NOTE: FOR tCUTOFF >15kHz, ADD A 5pF CAPACITOR ACROSS R41 AND R43

1064 TA13

Amplitude Response

0

–15

–30

–45

–60

–75

–90

–105

0 10 20 30 40 50 60 70

FREQUENCY (kHz)

8TH ORDER CLOCK-SWEEPABLE LOWPASS

ELLIPTIC ANTIALIASING FILTER MAINTAINS,

FOR 0.1Hz ≤ fCUTOFF ≤ 20kHz, A ±0.1dB MAX

PASSBAND ERROR AND 72dB MIN STOPBAND

ATTENUATION AT 1.5 × fCUTOFF

TOTAL WIDEBAND NOISE = 150µVRMS,

THD = 70dB (0.03%) FOR VIN = 3VRMS,

fCLK/fCUTOFF = 100:1. THIS FILTER AVAILABLE

AS LTC1064-1 WITH INTERNAL THIN FILM

RESISTORS

1064 TA14

1064fb

14

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