Content originally posted in LPCWare by Polux rsv on Wed Mar 28 06:08:14 MST 2012
add analog multiplexers before each LPC analog pin. For example, ADG408 is a 8to1 analog mux. If you put 8 ADG408, one for each AD pin, you could convert 64 channels in 8 burst conversions. You need 3 additional ouputs to drive the muxes. There are other analog multiplexers, CD4051, .... You should take care of power supplies and signals range. In other words, read the datasheets :D
Angelo