LMX2502 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – PLLatinum™ Frequency Synthesizer System with Integrated VCO

LMX2502, LMX2512
www.ti.com
SNWS010C – MARCH 2003 – REVISED APRIL 2013
LMX2502/LMX2512 PLLatinum™ Frequency Synthesizer System with Integrated VCO
Check for Samples: LMX2502, LMX2512
FEATURES
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•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 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.
LMX2502 and LMX2512 are available in a 28-pin
WQFN package.
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2
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.
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