Overview: FRACTIONAL-N RF/INTEGER-N IF DUAL PLL S1M8831A/33 INTRODUCTION
The S1M8831A/33 is a Fractional-N frequency synthesizer with integrated prescalers, designed for RF operation up to 1.2GHz/K-PCS and for IF operation up to 520MHz. The fractional-N synthesizer allows fast-locking, low phase noise phase-locked loops to be built easily, thus having rapid channel switching and reducing standby time for extended battery life. The S1M8831A/33 based on ∑ - ∆ fractional-N techniques solves the fractional spur problems in other fractional-N synthesizers based on charge pump pensation. The synthesizer also has an additional feature that the .. PCS/CDMA channel frequency in steps of 10kHz can be accurately programmed. 24-QFN-3.5×4.5 The S1M8831A/33 contains dual-modulus prescalers. The S1M8831A RF synthesizer adopts an 8/9 prescaler (16/17 for the S1M8833) and the IF synthesizer adopts an 8/9 prescaler. Phase detector gain is user-programmable for maximum flexibility to address IS-95 CDMA and IMT2000. Various program-controlled power down options as well as low supply voltage help the design of wireless cell phones having minimum power consumption. Using the Samsung's proprietary digital phase-locked-loop technique, the S1M8831A/33 has a linear phase detector characteristic and can be used for very stable, low noise PLLs. Supply voltage can range from 2.7V to 4.0V. The S1M8831A/33 is available in a 24-QFN package.
