LMX2305TM Datasheet PDF - National

●Acquired by Texas Instruments on September 23rd, 2011.

●General Description

●The LMX2305 is a high performance frequency synthesizer with an integrated prescaler designed for RF operation up to 550 MHz. It is fabricated using National’s ABiC IV BiCMOS process.

●The LMX2305 contains a dual modulus prescaler which can select either a 64/65 or a 128/129 divide ratio at input frequencies of up to 550 MHz. LMX2305, which employs the digital phase lock loop technique, combined with a high quality reference oscillator and a loop filter, provides the tuning voltage for the voltage controlled oscillator to generate a very stable, low noise local oscillator signal.

●Features

●■ RF operation up to 550 MHz

●■ 2.65V to 5.5V operation

●■ Low current consumption: ICC e 4.0 mA (typ) at VCC e 2.75V

●■ Dual modulus prescaler: 64/65 or 128/129

●■ Internal balanced, low leakage charge pump

●■ Small-outline, plastic, surface mount TSSOP, 0.173× wide package

●Applications

●■ Analog Cellular telephone systems (AMPS, ETACS, NMT)

●■ Portable wireless communications (PCS/PCN, cordless)

●■ Wireless local area networks (WLANs)

●■ Other wireless communication systems

●■ Pagers