ADI ADF4150HV 4.4 GHz频率合成方案

ADI 公司的ADF4150HV是集成了高压(6V到30V)电荷泵的4.4 GHz分数N或整数N的频率合成器,RF带宽到4.4GHz,输出分频可以是1/2/3/6/8或16,合成器电源3.0V到3.6V,可编程输出功率电平,主要用在无线基础设备,微波点对点/点对多点无线电,VSAT无线电,测试设备,军用和雷达等.本文介绍ADF4150HV主要特性, 功能方框图, 超宽带PLL电路图和微波PLL电路图以及ADuC70XX, ADSP-21xx和ADF4150HV连接框图.

The ADF4150HV is a 4.4 GHz fractional-N or integer-N frequency synthesizer with an integrated high voltage charge pump. The synthesizer can be used to drive external wide band VCOs directly, removing the need for operational amplifiers to achieve higher tuning voltages. This simplifies design and reduces cost while improving phase noise, as active filter topologies tend to degrade phase noise when compared to passive filters.

The VCO frequency can be divided-by 1/2/4/8 or 16 to allow the user to generate RF output frequencies as low as 31.25 MHz. For applications that require isolation the RF output stage can be muted. The mute function is both pin and software controllable.

Control of all the on-chip registers is through a simple 3-wire interface. The charge pump operates off a supply ranging from 6V to 30V, while the rest of the device operates from 3.0 V to 3.6 V. The ADF4150HV can be powered down when not in use.
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