General Description：

The RDA3308 is a single-chip dual-band RF front end for SCDMA and MC-SCDMA wireless communication, supporting 400/1800MHz dual-band applications. Comparing to the previous RDA3300/01 chipset, RDA3308 integrates RF radio with baseband interface as well. RDA3308, RDA3314(400MHz PAM), RDA3319(1800MHz PAM) and RDAES01(SP2T Switch) builds up a complete RF radio solution, which directly interface with antenna and baseband processor. All sensitive components, such as RF VCO, loop filters, and tuning inductors and varactors, are completely integrated into RDA3308.
Receive Path
The receiver uses a digital low-IF architecture that avoids the difficulties associated with direct conversion while delivering lower solution cost and reduced complexity, and consists of three sections; the first section is the RF front-end, which amplifies the SCDMA signal, then, converts the chosen channel down to a low IF of 250 kHz. The second section is the IF section, which further amplifies the chosen channel and performs gain control to adjust the output level to the desired value. The IF gain range can vary over more than 110 dB. The third section is the receiver baseband interface section, which first converts the analog IF signals to digital IF signal, then digital decimation, IIR filtering, and digital PGA is perf