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Features
RF operation up to 2.5 GHz
2.7V to 5.5V operation
Ultra Low Current Consumption
Low prescaler values
LMX2310/1/2U 32/33 or 16/17
LMX2313U 16/17 or 8/9
Excellent Phase Noise
Internal balanced, low leakage charge pump
Selectable Charge Pump Current Levels
Selectable Fastlock mode with Time-Out Counter
Low Voltage MICROWIRE interface (1.72V to VCC)
Digital and Analog Lock Detect
Small 20-pad Thin Chip Scale Package
Description The LMX2310/1/2/3U are high performance frequency synthesizers. The LMX2310/1/2U use a selectable, dual modulus 32/33 and
16/17 prescaler. The LMX2313U uses a selectable, dual modulus 16/17 and 8/9 prescaler. The device, when combined with a high
quality reference oscillator and a voltage controlled oscillator, generates very stable, low noise local oscillator signals
for up and down conversion in wireless communication devices.
Serial data is transferred into LMX2310/1/2/3U via a three-wire interface (Data, Enable, Clock) that can be directly interfaced
with low voltage baseband processors. Supply voltage can range from 2.7V to 5.5V. LMX2310U features very low current consumption,
typically 2.3 mA at 3.0V.
The LMX2310/1/2/3U are manufactured using National's 0.5µ ABiC V silicon BiCMOS process and is available in 20-pin CSP packages.
Applications
Cellular DCS, PCS, WCDMA telephone systems
Wireless Local Area Networks (WLAN)
Global Positioning Systems (GPS)
Other wireless communications systems
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