LMX2331U

www.DataSheet4U.com LMX2330U/LMX2331U/LMX2332U PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications July 2002 LMX2330U/LMX2331U/LMX2332U PLLatinum™ Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications LMX2330U 2.5 GHz/600 MHz LMX2331U 2.0 GHz/600 MHz LMX2332U 1.2 GHz/600 MHz General Description The LMX233xU devices are high performance frequency synthesizers with integrated dual modulus prescalers. The LMX233xU devices are designed for use as RF and IF local oscillators for dual conversion radio transceivers. A 32/33 or a 64/65 prescale ratio can be selected for the 2.5 GHz LMX2330U RF synthesizer. A 64/65 or a 128/129 prescale ratio can be selected for both the LMX2331U and LMX2332U RF synthesizers. The IF circuitry contains an 8/9 or a 16/17 prescaler. Using a proprietary digital phase locked loop technique, the LMX233xU devices generate very stable, low noise control signals for RF and IF voltage controlled oscillators. Both the RF and IF synthesizers include a two-level programmable charge pump. The RF synthesizer has dedicated Fastlock circuitry. Serial data is transferred to the devices via a three-wire interface (Data, LE, Clock). Supply voltages from 2.7V to 5.5V are supported. The LMX233xU family features ultra low current consumption: LMX2330U (2.5 GHz) — 3.3 mA, LMX2331U (2.0 GHz) — 2.9 mA, LMX2332U (1.2 GHz) — 2.5 mA at 3.0V. The LMX233xU devices are available in 20-Pin TSSOP and 24-Pin CSP surface mount plast...