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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.