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Old 20th November 2002, 10:47 AM   #1
Optical is offline Optical  New Zealand
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Default Maxim high pass filters

I just found out about these!
has anyone tried them out? ive ordered some samples, im not sure that they have a spectacular noise figure or anything, but they look very useable..

Are there any competition I.C's to these around?
Would an 8th order sullen-key filter be better?

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1370
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Old 20th November 2002, 01:40 PM   #2
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As you increase the order of an analog filter the tolerances of the components required get tighter and tighter, that is, with a 12dB/8vo filter you can probably get away with 1%, with 24dB/8vo it's more like 0.1%. OTOH, there are other problems to consider with switched cap filters:

With switched cap filters you have to post-filter to remove the clocking noise. Maxim doesn't state this in their PDF.

Note the noise figure and distortion -- -70dB -- well at least you will be able to measure it.
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Old 20th November 2002, 02:35 PM   #3
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Default but they look very useable..

For what?

high distortion
high noise
Extremly! low power supply rejection.

These filter types are maginal for all but the lowest fidelity uses.
I have even had trouble with them in voice frequency low end telcom applications.

Not even worth trying,
Fred

Its Sallen-Key, not sullen-key, by the way. Sullen is what you will be after reading this post.

http://www.bartleby.com/61/68/S0876800.html

Sallen-Key
http://www.altavista.com/web/results...ls=1&avkw=qtrp
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Old 20th November 2002, 03:17 PM   #4
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Default TI has a big ap note

on Sallen-Key filters. It is well worth downloading.
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Old 20th November 2002, 10:24 PM   #5
Optical is offline Optical  New Zealand
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So i forgot how it was spelt... Sullen im not.
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Old 20th November 2002, 10:26 PM   #6
Optical is offline Optical  New Zealand
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Ive been checking out other manufacturers, seems LT make an ultralow noise model.. Ive got samples on the way, thanks for the input!
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