switched cap charge pump

Recently I was using a transformer based (wall-wart) negative supply for the LT1264 switched-cap bandpass filter. Was working great. I am trying to use a charge pump IC (Microchip TC962) instead to supply the same negative 5v to the chip but am getting odd results and sometimes the chip seems "oddly changed". Are there any conceptual blunders with this approach to supplying the -5 in this fashion?

BTW, no smart ass answers appreciated.

Thx!

TC962 DS:https://www.electro-tech-online.com/custompdfs/2006/06/TC962.pdf

LT1264 DS:https://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1154,C1008,C1149,P1428,D3911

It is likely that the switching frequency of the inverter is interfering with the switching frequency of the filter. What is the center frequency of your filter?

Filter is bandpass (0.8 = Passband, Fc=40K).