LMX2522 Datasheet, PDF (1/26 Pages) National Semiconductor (TI) – PLLatinum Frequency Synthesizer System with Integrated VCOs

LMX2522, LMX2532
www.ti.com
SNWS009B – MARCH 2003 – REVISED APRIL 2013
LMX2522/LMX2532 PLLatinum™ Frequency Synthesizer System with Integrated VCOs
Check for Samples: LMX2522, LMX2532
FEATURES
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•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
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 three-
wire 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.
APPLICATIONS
• Korean PCS CDMA Systems with GPS
• Korean Cellular CDMA Systems with GPS
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PLLatinum is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2013, Texas Instruments Incorporated