S1M8831A Datasheet | Samsung Semiconductor

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 10k Hz 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. Features - High operating frequency dual synthesizer - S1M8831A: 0.71 to 1.2GHz(RF)/ 45 to 520MHz(IF) - S1M8833: 1.6 to 1.65GHz(RF)/ 45 to 520MHz(IF) - - - - Operating voltage range: 2.7 to 4.0V Low current consumption (S1M8831A: 5.0m A, S1M8833: 7.0m A) Selectable power saving mode (ICC = 1u A typical @ 3V) Dual-modulus prescaler and Fractional-N/Integer-N: - S1M8831A - S1M8833 - S1M8831A/33 - - - - - (RF) 8/9 (RF) 16/17 (IF) 8/9 Fractional-N Fractional-N Integer-N Excellent in-band phase noise ( - 85d Bc/Hz @ PCS, -90d Bc/Hz @CDMA) Improved...