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FEATURES

23? Small Size

– Small 5.0 mm x 5.0 mm x 0.75 mm 28-Pin

WQFN Package

? RF/GPS Synthesizer System

– Integrated RF VCO

– Integrated GPS 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 Frequencies

? Supports Various Reference Oscillator

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 with GPS

? Korean Cellular CDMA Systems with GPS

DESCRIPTION

LMX2522 and LMX2532 are highly integrated, high

performance, low power frequency synthesizer

systems optimized for Korean PCS (K-PCS) with

GPS and Korean Cellular (K-Cellular) with GPS,

CDMA (1xRTT, IS-95) mobile handsets. Using a

proprietary digital phase locked loop technique,

LMX2522 and LMX2532 generate very stable, low

noise local oscillator signals for up and down

conversion in wireless communications devices.

LMX2522 and LMX2532 include a RF voltage

controlled oscillator (VCO), a GPS 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 and GPS synthesizer system. LMX2522 supports

the Korean PCS band with GPS and LMX2532

supports the Korean Cellular band with GPS.

LMX2522 and LMX2532 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,

LMX2522 and LMX2532 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.

LMX2522 and LMX2532 are available in a 28-pin

WQFN package.