Hi, Naman,
I am sorry for the delay.
Unfortunately, we have not the example for ads1248 based on LPC18xx, but I think you can refer to the spi example. The LPC18xx spi can be a master and access the ads1248.
This is LPCOpen software package, you can refer to the spi code in LPCOpen package.
LPCOpen Software for LPC18XX | NXP
Hope it can help you
BR
Xiangjun Rong