LMX2305数据手册集成电路（IC）的时钟发生器PLL频率合成器规格书PDF

描述 Description

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.

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