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.