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.
ADF4150HV主要特性:
Fractional-N synthesizer and integer-N synthesizer
High voltage charge pump: 6 V to 30 V
RF bandwidth to 4.4 GHz
Programmable divide-by-1/2/4/8 or 16 outputs
3.0 V to 3.6 V synthesizer power supply
Programmable dual-modulus prescaler of 4/5 or 8/9
Programmable output power level
Programmable charge pump currents
RF output mute function
3-wire serial interface
Analog and digital lock detect
ADF4150HV应用:
Wireless infrastructure
Microwave Point to Point/Multi-Point Radios
VSAT Radios
Test equipment
Military & Radar applications
Private/Land Mobile Radio
图1.ADF4150HV功能方框图
图2.采用ADF4150HV和VCO的超宽带PLL电路图
图3.采用ADF4150HV的16GHz 微波PLL电路图
图4. ADuC70XX和ADF4150HV连接框图
图5. ADSP-21xx和ADF4150HV连接框图
ADF4150HV.pdf (634.24 KB) 
ADI ADF4150HV 4.4 GHz频率合成方案: 201098223238859.gif
