Filter IC's

A

Areal Person

New Member

• Apr 3, 2008

• #1

Do they make general filter IC's ( low pass, high pass, band pass etc.) ?

I'm having problems with my discrete component filters.

What are some of the general filter IC's (If they make them) ?
Where can I get them ?

Thanks,
-Areal

 

crutschow

Well-Known Member

Most Helpful Member

• Apr 3, 2008

• #2

Need a little more info about frequency, bandwidth, signal level...

 

audioguru

Well-Known Member

Most Helpful Member

• Apr 3, 2008

• #3

Years ago, National Semi made some good switched-capacitor lowpass and multi-purpose filter ICs for audio. I was the only person buying them so they discontinued most of them.
Now Maxim-IC has many.

 

A

Areal Person

New Member

• Apr 3, 2008

• #4

General filtering IC's ( low pass, high pass, band pass etc.) ?

as long as there +0vdc


No one uses IC filters ? There all built using Discreet components ?

 

Last edited: Apr 3, 2008

audioguru

Well-Known Member

Most Helpful Member

• Apr 3, 2008

• #5

Areal Person said:

No one uses IC filters ? There all built using Discreet components ?

Click to expand...

I used the National Semi LMF40 switched-capacitor 4th order Butterworth lowpass filter ICs. Maxim-IC has similar ones today. It made a very accurate filter.

 

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k7elp60

Active Member

• Apr 3, 2008

• #6

The National Semiconductor LMF100CCN is still availible from Digikey

 

audioguru

Well-Known Member

Most Helpful Member

• Apr 3, 2008

• #7

The LMF100 is a universal switched-capacitor IC. It needs many extra parts to make a simple lowpass filter. I used one to make a notch filter.

 

A

Areal Person

New Member

• Apr 4, 2008

• #8

Looks like the LMF100 / LMF100CCN is what I need !

Thanks !