The GC5318 is a high-density multi-channel communications signal processor integrated circuit that provides digital upconversion optimized for cellular base transceiver systems. The device supports both UMTS and CDMA2000 (CDMA) air interface cellular standards. The chip provides up to 24 CDMA digital upconverter (DUC) channels or 12 UMTS DUC channels. The GC5318 can also support a combination of CDMA and UMTS channels. The DUC channels operate simultaneously.