LMX2434

The LMX2434 devices are high performance frequency syn-thesizers with integrated dual modulus prescalers. TheLMX243x devices are designed for use as RF and IF localoscillators for dual conversion radio transceivers.

A 32/33 or a 16/17 prescale ratio can be selected for the 5.0GHz LMX2434 RF synthesizer. An 8/9 or a 16/17 prescaleratio can be selected for both the LMX2430 and LMX2433RF synthesizers. The IF circuitry contains an 8/9 or a 16/17prescaler. Using a proprietary digital phase locked loop tech-nique, the LMX243x devices generate very stable, low noisecontrol signals for RF and IF voltage controlled oscillators.Both the RF and IF synthesizers include a two-level pro-grammable charge pump. Both the RF and IF synthesizershave dedicated Fastlock circuitry with integrated timeoutcounters. Furthermore, only a single word write is required topower up and tune the synthesizers to a new frequency.

Serial data is transferred to the devices via a three-wireinterface (DATA, LE, CLK). A low voltage logic interfaceallows direct connection to 1.8V devices. Supply voltagesfrom 2.25V to 2.75V are supported . The LMX243x familyfeatures low current consumption:LMX2430 (3.0 GHz/ 0.8 GHz)-2.8 mA/ 1.4 mA, LMX2433(3.6 GHz/ 1.7 GHz) -3.2 mA/ 2.0 mA, LMX2434 (5.0 GHz/2.5 GHz)-4.6 mA/ 2.4 mA at 2.50V.

The LMX2434 devices are available in 20-Pin TSSOP and20-Pin UTCSP surface mount plastic packages.