S1M8837X01-G0T0

FRACTIONAL-N RF/INTEGER-N IF DUAL PLL S1M8836/37 INTRODUCTION The S1M8836/37 is a Fractional-N frequency synthesizer with integrated prescalers, designed for RF operation up to 1.0GHz/2.5GHz 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 S1M8836/37 based on Σ - ∆ fractional-N techniques solves the fractional spur problems in other fractional-N synthesizers based on charge pump compensation. 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 S1M8836/37 contains quadruple-modulus prescalers. The S1M8836 RF synthesizer adopts an 8/9/12/13 prescaler(16/17/20/21 for the S1M8837) 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 S1M8836/37 has a linear phase detector characteristic and can be used for very stable, low noise PLL's. Supply voltage can range from 2.7V to 4.0V. The S1M8836/37 is available in a 24-QFN package. FEATURES • • • • • High operating frequency dual synthesizer Operating voltage range : 2.7 to 4.0V Low current consumption(S1M8836: 5.5mA, S1M8837: 7.5mA) Selectable power saving mode (Icc = 1uA typical @3V) Quadruple-modulus prescaler and Fractional-N/Integer-N:  S1M8836  S1M8837  S1M8836/37 • • • • • • • • (RF) 8/9/12/13 (RF) 16/17/20/21 (IF) 8/9 Fractional-N Fractional-N Integer-N S1M8836: 250MHz to 1.0GHz(RF) / 45MHz to 520MHz(IF) S1M8837: 500MHz to 2.5GHz(RF) / 45MHz to 520MHz(IF) Excellent in-band phase noise ( – 85dBc/Hz @ PCS, – 90dBc/Hz @ CDMA) Improved fractional spurious performance ( < 80dBc ) Frequency resolution (= 10kHz/64 @ fref = 9.84MHz) Fast channel switching time: