RC Filter Prior to CF-6004

[Whelan]

I am designing a PGA and low-pass filter board to interface with the CF-6004 compact flash DAQ card.  I plan to use a 4 pole Sallen-Key filter in the design using 2 op amps.  I noticed that the CF-6004 has an amp ahead of the ADC.  I was thinking that I could use this to my advantage by adding an RC low-pass real pole filter after the 4 pole sallen-key to increase the filter roll-off.

Is there any problem with adding an RC filter (R=1.21k and C=330nF, or R=12.1k and C=33nF) ahead of the CF-6004?  Is there any resistance through the MUX?  What about parallel capacitance?  The unity gain amplifier is just a non-inverting voltage follower, right?

Thanks,

Matt

[Nicholas_B]

Hi Matt,

I've spoken to some folks in R&D about your questions and it sounds like they were already aware of them.  They are requesting that you continue through our email support system, so that we may send you certain files.  Please visit our Request Support page and enter your information for an email service request.  In your message, please include my name (Nicholas B) so that your service request email will be routed appropriately. 

Thank you!

Regards,

Nicholas B, National Instruments