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WF521TA
伟烽恒-WFH
WF521TA内置 RF 发射电路和高性能的 MCU 编程电路，支持 ASK 调制方式，它所有的调谐都可在芯片内自动完成。片内集成了 PLL 和功率放大器等电路。WF4455 具有低功耗，宽工作电压，大输出功率等特点。芯片内集成了 PLL 和功率放大器，其中 PLL 为发射机提供载波信号，PLL 的工作频点较低（433M 和315M），采用的是环形振荡器提供的本振信号，环路中采用的固定的分频电路，并内置环路滤波器，整体的功耗控制在 1mA 以下。功率放大器将输入信号进行功率放大，采用漏极开路输出，外接扼流电感结构。应用时采用π型窄带匹配网络，提高谐波抑制，保证输出信号功率大于 10dBm。精简指令的 MCU 电路使用编程更加简单方便。
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