基于RF6525的ZigBee前端設計解決方案

RF6525是RFMD公司的2.4GHz 到2.5GHz頻段的ZigBee前端模塊(FEM),在發送(TX)通路集成功率放大器和諧波濾波器,接收通路(RX)集成了帶旁路模式的LNA.此外,在TX和RX還集成了多種開關,并提供平衡輸入和輸出信號.TX輸出功率22dBm,TX增益28dB,RX增益11.5dB,噪音為2.5dB. RF6525可用作基于ZigBee? 802.15.4系統的遙控和監視以及ISM頻段的其它應用.本文介紹RF6525主要特性,功能方框圖以及RF6525/EM357參考設計電路圖與材料清單.

The RF6525 integrates a complete solution in a single Front End Module (FEM) for ZigBee? applications in the 2.4GHz to 2.5GHz band. This FEM integrates the PA plus harmonic filter in the transmit path and the LNA with bypass mode in the receive side. It also integrates a diversity switch and provides balanced input and output signals for both the TX and RX paths respectively.

The RF6525 FEM is ideal for ZigBee? systems operating with a minimum output power of 20dBm and high efficiency requirements. On the receive path, the RX Chain provides 11.5dB of typical gain with only 7mA of current and excellent NF of 2.5dB. This FEM meets or exceeds the system requirements for ZigBee? applications operating in the 2.4GHz to 2.5GHz band.

RF6525主要特性:

TX Output Power: 22dBm

TX Gain: 28dB

RX Gain: 11.5dB

RX NF: 2.5dB

Integrated LNA With Bypass Mode

RF6525應用:

ZigBee? 802.15.4 Based Systems for Remote Monitoring and Control

Other Applications in the ISM Band

圖1.RF6525F功能方框圖

RF6525/EM35X參考設計

RFMD’s portfolio of single-chip integrated front end modules (FEMs) are developed for high-performance ZigBee^??Home Area Network(HAN) / Smart Energy applications in the 2.4 GHz to 2.5 GHz ISM band. The?RF6525, RF6515, and RF6535 are specifically designed to operate with the Ember EM300 Series System-on-Chips?(SoCs) - EM351 and EM357, EM250 SoC, and EM260 co-processor. The FEMs address the need for aggressive size?reduction in an IEEE 802.15.4 front end design and offer a reduced footprint and minimized component count.

The RF6525/EM35x reference design is a partnership between RFMD and Ember presenting a complete 2.4GHz IEEE 802.15.4-2003-compliant radio transceiver solution. Ember presents a fully integrated system-on-chip (SoC) with 32-bit ARM? Cortex?-M3 microprocessor, flash memory, and RAM memory, delivering unmatched performance and EmberZNet PRO network protocol stack to designers of ZigBee-based systems. RFMD presents a world class front end module (FEM) for efficient extended output power above 20dBm with harmonic filtering, diversity switch, and LNA option for "bypass mode".

This document briefly describes the RF6525/EM35x reference design and how it is set up and configured for Engineering Evaluation of the RF6525 FEM using Ember’s nodetest application firmware, pre-flashed on the EM357 SoC. Snapshots of Tx and Rx data are included.


圖2.采用USB接口和電源的RF6525/EM357參考設計外形圖

圖3.RF6525/EM357參考設計電路圖