About MAX4466 and MAX4468 datasheet schmatic question!

All of the products in this family are effectively Op-Amps which require negative feedback to function.  With op-amps you can use them in either inverting, or non-inverting configuration.  Connecting the incoming mic signal to IN+ will result in a non-inverting gain.  Connecting the incoming MIC signal to the IN- input will result in an inverting gain.  This should be easily researchable online. 

Both the MAX4466 and MAX4468 are minimum gain stable of 5V/V.  This allows greater maximum bandwidth, but you cannot use a gain lower than 5V/V.

The only difference is that the MAX4468 includes a MIC_BIAS and a Shutdown pin and the MAX4466 does not.

I plan to use the MAX4468 for the preamplification of the MIC. The MIC model is Knowles FG-23652-P16. Since the MIC has three input lines, could you please help me check if this circuit connection is correct? Also, I need to increase the default gain. Can I adjust the resistance values of R18 and R19 to achieve this?

The MIC connections look correct.  You will want to ensure the MIC bias voltage provided matches the microphones expected range.

Yes, you can adjust the gain with R18/R19 to achieve the gain you want.

The MIC connections look correct.  You will want to ensure the MIC bias voltage provided matches the microphones expected range.

Yes, you can adjust the gain with R18/R19 to achieve the gain you want.