The “CC” in the TI part numbers stands for “ChipCon”, who TI acquired for these wireless products. The CC1100, one of their earliest parts, has a documented but unsupported debug mode which dumps raw quadrature samples out some of the I/O pins. Later parts do not mention such a feature in their documentation, but it’s not proven it was removed.
Author here, it’s totally possible to get IQ samples from the RX chain! Unfortunately, the design of the TX chain is in such a way that it does not work off of IQ DACs, and is more limited in what the silicon can generate.
