[原创]Maxim MAX19791 50－4000MHz双路模拟电压可变衰减器解决方案

Maxim公司的MAX19791是50-4000MHz双路模拟电压可变衰减器(VVA).器件包括专利控制电路,为每个衰减器23dB衰减范围,其典型线性控制斜率8dB/V.两个衰减器共享共同的模拟控制,并级联以获得46dB总衰减和典型线性控制斜率16dB/V(5V工作).另外器件的4线SPI控制的10位DAC能用来控制两个衰减器.MAX19791是单片集成电路,采Maxim公司的SiGeBiCMOS工艺,工作电压5V或3.3V,紧凑的36引脚TQFN封装(6mm x 6mm x 0.8mm).器件具有高度线性,整个衰减范围内IIP3大于+37.4dBm,输入P1dB为+22.6dBm.主要用在WCDMA/LTE, TD-SCDMA/TD-LTE, WiMAX®, cdma2000M, GSM/EDGE和 MMDS,基站,VSAT/卫星调制解调器,微波点对点系统,温度补偿电路,自动控制电平(ALC),发送器增益控制,线性增益微调,接收器增益控制和通用测试设备.本文介绍了MAX19791主要特性,典型应用电路以及评估板MAX19791 EVK主要特性,电路图,材料清单和PCB设计图.

The MAX19791 dual general-purpose analog voltage variable attenuator (VVA) is designed to interface with 50I systems operating in the 50MHz to 4000MHz frequency range. The device includes a patented con­trol circuit that provides 23dB of attenuation range (per attenuator) with a typical linear control slope of 8dB/V.

Both attenuators share a common analog control and can be cascaded together to yield 46dB of total attenua­tion range with a typical combined linear control slope of 16dB/V (5V operation).

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