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Frequency Synthesizer for RF Personal
Communications
LMX2346 2.0 GHz
LMX2347 2.5 GHz
General Description
The LMX2346/7 are high performance frequency synthesiz-
ers with an integrated 32/33 dual modulus prescaler. The
LMX2346 is designed for RF operation up to 2.0 GHz. The
LMX2347 is designed for RF operation up to 2.5 GHz. Using
a proprietary digital phase locked loop technique, the
LMX2346/7 generates very stable, low noise control signals
for UHF and VHF voltage controlled oscillators.
Serial data is transferred into the LMX2346/7 via a three-line
MICROWIRE interface (DATA, LE, CLOCK). Supply voltage
range is from 2.7V to 5.5V. The charge pump provides 4 mA
output current.
The LMX2346/7 are manufactured using National鈥檚 0.5碌
ABiC V silicon BiCMOS process and is available in 16-pin
TSSOP and 16-pin CSP packages.
Features
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RF operation up to 2.5 GHz
2.7V to 5.5V operation
Digital & Analog Lock Detect
32/33 Dual modulus prescaler
Excellent Phase Noise
Internal balanced, low leakage charge pump
Pin Compatible to LMX2323
Applications
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Cellular DCS/PCS/3G infrastructure equipment
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Wireless Local Area Networks (WLANs)
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Other wireless communication systems
Functional Block Diagram
20038406
PLLatinum
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is a trademark of National Semiconductor Corporation.
漏 2004 National Semiconductor Corporation
DS200384
www.national.com
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