1FEATURES
2• Small Size
– 5.0 mm X 5.0 mm X 0.75 mm 28-Pin WQFN
Package
• RF Synthesizer System
– Integrated RF VCO
– Integrated Loop Filter
– Low Spurious, Low Phase Noise Fractional-
N RF PLL Based on 11-Bit Delta Sigma
Modulator
– 10 kHz Frequency Resolution
• IF Synthesizer System
– Integer-N IF PLL
– Programmable Charge Pump Current
Levels
– Programmable Frequency
• Supports Various Reference Frequencies
– 19.20/19.68 MHz
• Fast Lock Time: 500 μs
• Low Current Consumption
– 17 mA at 2.8 V
• 2.7 V to 3.3 V Operation
• Digital Filtered Lock Detect Output
• Hardware and Software Power Down Control

APPLICATIONS
• Korean PCS CDMA Systems
• Korean Cellular CDMA Systems

DESCRIPTION
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 communications
devices.
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 band.
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 threewire
MICROWIRE interface (DATA, LE, CLK).
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.