LMX2305  Product Folder

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.

Serial data is transferred into the LMX2305 via a three line MICROWIRE™ interface (Data, Enable, Clock). Supply voltage can range from 2.65V to 5.5V. The LMX2305 features very low current consumption, typically 4.0 mA at 2.75V.

The LMX2305 is available in a TSSOP 20-pin surface mount plastic package.

• RF operation up to 550 MHz
• 2.65V to 5.5V operation
• Low current consumption: I_CC = 4.0 mA (typ) at V_CC = 2.75V
• Dual modulus prescaler: 64/65 or 128/129
• Internal balanced, low leakage charge pump
• Small-outline, plastic, surface mount TSSOP, 0.173[Foot][Minute][Prime] wide package

• Analog Cellular telephone systems (AMPS, ETACS, NMT)
• Portable wireless communications (PCS/PCN, cordless)
• Wireless local area networks (WLANs)
• Other wireless communication systems
• Pagers