DS_S1M8837 Datasheet, PDF (1/29 Pages) Samsung semiconductor – FRACTIONAL-N RF/INTEGER-N IF DUAL PLL

FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
S1M8836/37
INTRODUCTION
24-QFN-3.5×4.5
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.
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
(RF) 8/9/12/13
Fractional-N
 S1M8837
(RF) 16/17/20/21 Fractional-N
 S1M8836/37
(IF) 8/9
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 @ f_ref = 9.84MHz)
• Fast channel switching time: <500us
• Programmable charge pump output current: from 50µA to 800µA in 50µA steps
• Programmability via on-chip serial bus interface
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