AD8361中文版功能说明

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1、AD8361是用于低频到2.5GHZ的功率检测器一：Features(特性)：Calibrated RMS Response（标准化的均方根响应）Excellent temperature stability（极好的温度稳定性）UP to 30db input range at 2.5GHZ（高达30DB的输入范围在2.5GHZ）700 mv RMS,10dbm re 50 maximum input（0.25dB linear response up to 2.5GHZ（正负0.25db线性响应）Single supply operation: 2.7v to 5.5v(单工作电压)Low

2、power:3.3mw at 3v supply(低功耗)Rapid power-down to less than 1UA(快速掉电到小于1UA)二：Applications(应用)1：Measurement of CDMA,W-CDMA,QAM,（CDMA,W-CDMA,QAM,的测量）2：other complex modulation waveforms（其他复杂的波形调整）3：RF transmitter or receiver power measurement（射频发射器或接收器的功率测量）三：PRODUCT DESCRIPTION(产品描述）The AD8361 is a me

3、an-responding power detector for use in high-frequency receiver and transmitter signal chains, up to 2.5GHz.（AD8361是一个平均响应的功率检测器当被用于高频接收器和发射器信号链，高达2.5GHZ）It is very easy to apply. It requires only a single supply between 2.7 V and 5.5 V, power supply decoupling capacitor（去耦电容） and an input coupling

4、capacitor（耦合电容） in most applications. The output is a linear-responding dc voltage with a conversion gain（转换增益） of 7.5 V/Vrms.（他应用方便，仅要求一个2.7V到5.5V的单电源，电源的去耦电容和输入的耦合电容，在大多数应用中，输出是一个线性响应直流电压，转换增益为：7.5V/Vrms.）An external lter capacitor（滤波电容） can be added to increase the averaging time constant.（一个外接的滤

5、波电容能有利于提高平均时间常数）CW(continuous wave ,连续波）The AD8361 is intended for true power measurement of simple and complex waveforms.（AD8361被用于简单的和复杂的波形的功率测量）The device is particularly useful for measuring high crest-factor(high peak-to-rms ratio) signals,such as CDMA,W-CDMA.（这个器件特别的被用于高波峰因数crest-factor信号的测量，例

6、如CDMA,W-CDMA）四：工作模式The AD8361 has three operating modes to accommodate(适应）a variety of analog-to-digital requirement:（有3中工作模式以适应各种各样的模数转换的需求）1. ground referenced mode, in witch the origin is 0;（接地参考模式下，无信号时输出为0v）2. Internal referenced mode,in witch the origin is 0.35v（在内部参考模式下，无信号时输出为0.35v）3. Supply

7、 referenced mode,in witch the origin is Vs/7.5v（在电源参考模式下，无信号时输出为Vs/7.5V）参考模式IREFSREFOUTPUTNO SIGNALOUTPUT接地参考模式接电源接地07.5Vin内部参考模式悬空接地0.35v7.5Vin+0.35V电源参考模式接电源接电源Vs/7.57.5Vin+Vs/7.5由上图Figure 35可知，RFIN的偏压（Bias voltage）范围为0V到0.8V，输出电压范围为0V到4.9V。五：输入耦合，匹配，驻波比In all modes,the device is powered by a sing

8、le supply of between 2.7v and 5.5v.the VPOS pin is decoupled using 100pF and 0.01uF capacitors.(在所有的模式下，此期间被提供1个2.7v-5.5v的单电源，VPOS脚被退耦用100pF和0.01uF的电容。）The quiescent current of 1.1mA in operating mode can be reduced to 1uA by pulling the PWDN pin up to VPOS.（在工作模式下，1.1mA的静态电流能够被降低到1uA，通过PWDN脚接电源脚VPO

9、S）A 75欧external shunt resistance combines with the ac-coupled input to give an overall broadband input impedance near 50欧。（1个75欧的外接分流电阻与ac耦合输入结合，来提供1个约为50欧的全部宽带输入阻抗）。Note that the coupling capacitor must be placed between the input and the shunt impedance.（请注意，耦合电容必须安置在输入脚和分流阻抗之间）The input coupling

10、capacitor combines with the internal input resistance to give a high-pass corner frequency given by the equation.（输入耦合电容与内部输入电阻相结合，由这个方程来提供1个高通角频率。）a number of options exist for input matching.（输入匹配存在多种选择）for operation at multiple frequency,a 75 shunt to ground,as shown in figure 39a,will provide th

11、e best overall match.（在多频操作下，ruth39a所示，1个75欧分流到地的电阻Rsh，将提供最好的整体匹配）for use at a single frequency, a resistive or a reactive match can be used.（单一频率使用时，一个电阻或1个失配都可以使用）by plotting the input impedance on a smith chart（测绘出输入阻抗在史密斯原图上）the best value for a resistive match can be calculated.（最佳匹配电阻值可以被计算出）t

12、he VSWR can be held below 1.5 at frequencies up to 1GHZ,even as the input impedance varies from part to part.at very high frequencies(1.9GHZ to 2.5GHZ),a shunt resistor will not be sufficient to reduce the VSWR below 1.5.（在非常搞的频率1.8GHZ到2.5GHZ，1个分流电阻将不足以降低驻波比到1.5下）where VSWR is critical,remove shunt

13、component and insert an inductor in series with the coupling capacitor as shown in figure 39b。（在驻波比是关键的情况下，移除分流电阻Rsh，并插入1个电感Lm和耦合电容串联Cc，如图39b所示）Table II gives recommended shunt resistor values for various frequencies and series inductor values for high frequencies.(表2给出建议的分流电阻值在多种频率下,和串联电感值在高频下)the

14、coupling capacitor,Cc, essentially acts as an ac-short and plays no intentional part in the matching.(耦合电容Cc本质上作为隔直通交用，在匹配中不是策划的部分）六：Pin function descriptions(管教功能描述）1. VPOS:supply voltage pin,operational range is 2.7v-5.5v;(电源脚，工作电压范围为2.7v-5.5v）2. IREF :output reference control pin, when this pin i

15、s left open,internal referenced mode is enabled.otherwise this pin should be tied to Vpos,dont ground this pin.（输出参考控制脚，当这个脚悬空时，工作模式为内部参考模式，其他两种模式下，此脚应接电源，不能接地）3. RFIN: signal input pin,must be driven from an ac-coupled source,the low frequency real input impedance is 225欧。（信号输入脚，此脚必须被交流耦合源（此脚要串联耦合电

16、容）驱动，低频实际输入阻抗为225欧。）4. PWDN: power-down pin,for the device to operate as a detector it needs a logical low input(less than 100mv).when a logical high(greater than Vs-0.5v) is applied,the device is turned off and the supply current goes to nearly 0,(休眠控制脚，此期间作为检测器工作是，此脚需要一个逻辑低电平输入（小于100MV），当一个逻辑高电平被提

17、供时，此期间将关掉，并且电源电流变为0）此脚一般情况是接地。5. COMM；device ground pin,(电源地）6. FLTR:By placing capacitor between this pin and VPOS,the corner frequency（角频率）of the modulation filter(调制滤波器） is lowered,(在此脚和电源脚之间加电容，调制滤波器的角频率被降低）7. VRMS:output pin,near rial to rial voltage output with limited current drive capabilities,expected load10k欧 to ground.(输出脚，接近轨到轨电压输出，电流驱动能力被限制，期望的对地负载为大于10K欧）8. SREF: supply reference control pin,when this pin is connected to VPOS,enable supply reference mode,otherwise it should be connected to ground.（电源参考控制脚，当此脚接电源时，工作模式为电源参考模式，其他2种模式下，此脚应接地）