LMX2347

LMX2346/LMX2347 PLLatinum Frequency Synthesizer for RF Personal Communications November 2002 LMX2346/LMX2347 PLLatinum™ Frequency Synthesizer for RF Personal Communications LMX2346 2.0 GHz LMX2347 2.5 GHz General Description The LMX2346/7 are high performance frequency synthesizers 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’s 0.5µ ABiC V silicon BiCMOS process and is available in 16-pin TSSOP and 16-pin CSP packages. Features n n n n n n n 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 n Cellular DCS/PCS/3G infrastructure equipment n Wireless Local Area Networks (WLANs) n Other wireless communication systems Functional Block Diagram 20038406 PLLatinum™ is a trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation DS200384 www.national.com LMX2346/LMX2347 C...