Datasheet > LTC1064

LTC1064

更新时间： 2023-12-20 18:45:52

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	270K
描述
低噪声、快速、4 通道、通用型滤波器单元式部件

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LTC1064 数据手册

LTC1064

W U U

APPLICATIONS INFORMATION

Noise

Offset Nulling

All the noise performance mentioned excludes the clock

feedthrough. Noise measurements will degrade if the

already described grounding bypassing and buffering

techniques are not practiced. The graph Wideband Noise

vs Q in the Typical Performance Characteristics section is

a very good representation of the noise performance of

this device.

Lowpass filters may have too much DC offset for some

users. A servo circuit may be used to actively null the

offsets of the LTC1064 or any LTC switched-capacitor

filter.ThecircuitshowninFigure4willnulloffsetstobetter

than300µV. Thiscircuittakessecondstosettlebecauseof

the integrator pole frequency.

SEPARATE V POWER SUPPLY TRACE FOR BUFFER

R12

FROM

R11

FILTER OUTPUT

0.1µF

10k

1µF

R21

R31

R22

R32

10k

–

LT^®318

TRACE FOR FILTER

100k

LT1007

LT1056

OUT

TO FILTER

FIRST SUMMING

NODE

LT1012

LTC1064

0.1µF

POSITIVE

SUPPLY

0.1µF

–

0.1µF

1µF

0.1µF

NEGATIVE

SUPPLY

0.1µF

C1 = C2 = LOW LEAKAGE FILM

(I.E., POLYPROPYLENE)

R1 = R2 = METAL FILM 1%

1064 F04

1064 F03

Figure 3. Buffering the Output of a 4th Order Bandpass Realization

Figure 4. Servo Amplifier

ODES OF OPERATIO

PRIMARY MODES

Mode 1

In Mode 1, the ratio of the external clock frequency to the

center frequency of each 2nd order section is internally

fixed at 50:1 or 100:1. Figure 5 illustrates Mode 1 provid-

ing 2nd order notch, lowpass and bandpass outputs.

Mode 1 can be used to make high order Butterworth

lowpass filters; it can also be used to make low Q notches

and for cascading 2nd order bandpass functions tuned at

thesamecenterfrequencywithunitygain.Mode1isfaster

than Mode 3. Note that Mode 1 can only be implemented

with three of the four LTC1064 sections because Section

D has no externally available summing node. Section D,

however, can be internally connected in Mode 1 upon

special request.

–

∫

1/4 LTC1064

AGND

CLK

100(50)

; f = f ; H

= –

; H

= –

; H = –

ON1

; Q =

OLP

OBP

1064 F05

Figure 5. Mode 1: 2nd Order Filter Providing Notch,

Bandpass and Lowpass

1064fb

1...5 6 789 10 11...20

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