LMX2502 and LMX2512 are highly integrated, high performance, low power frequency
synthesizer systems optimized for Korean PCS and Korean Cellular CDMA (1xRTT, IS-95) mobile
handsets. Using a proprietary digital phase locked loop technique, LMX2502 and LMX2512 generate
very stable, low noise local oscillator signals for up and down conversion in wireless
LMX2502 and LMX2512 include a voltage controlled oscillator (VCO), a loop filter, and a
fractional-N RF PLL based on a delta sigma modulator. In concert these blocks form a closed loop RF
synthesizer system. LMX2502 supports the Korean PCS band and LMX2512 supports the Korean Cellular
LMX2502 and LMX2512 include an Integer-N IF PLL also. For more flexible loop filter
designs, the IF PLL includes a 4-level programmable charge pump. Together with an external VCO and
loop filter, LMX2502 and LMX2512 make a complete closed loop IF synthesizer system.
Serial data is transferred to the device via a three-wire MICROWIRE interface (DATA, LE,
Operating supply voltage ranges from 2.7 V to 3.3 V. LMX2502 and LMX2512 feature low
current consumption: 17 mA at 2.8 V.
LMX2502 and LMX2512 are available in a 28-pin WQFN package.
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