ADI ADF7241零IF 2.4GHz低功耗收发器解决方案

ADI 公司的ADF7241是高集成低功耗高性能的零IF 2.4GHz低功耗收发器，支持IEEE 802.15.4-2006 2.4 GHz PHY，并和FCC CFR47 Part 15, ETSI EN 300 440 (Equipment Class 2), ETSI EN 300 328 (FHSS, DR > 250 kbps)以及ARIB STD T-66标准兼容，250kbps的灵敏度为-95dBm，输出功率在-20dBm到+4.8dBm间编程，工作电压1.8V-3.6V，主要用在无线传感器网络，自动读表/智能表，工业无线控制，保健，无线音/视频，消费类电子和ZigBee。本文介绍了ADF7241主要特性，功能方框图，以及多种应用电路图。
Low Power IEEE 802.15.4 Zero-IF 2.4 GHz Transceiver IC
The ADF7241 is a highly integrated, low power, and high performance transceiver for operation in the global 2.4 GHz ISM band. It is designed with emphasis on flexibility, robustness, ease of use, and low current consumption. The IC supports the IEEE 802.15.4-2006 2.4 GHz PHY requirements in both packet and data streaming modes. With a minimum number of external components, it achieves compliance with the FCC CFR47 Part 15, ETSI EN 300 440 (Equipment Class 2), ETSI EN 300 328 (FHSS, DR > 250 kbps), and ARIB STD T-66 standards.
The ADF7241 complies with the IEEE 802.15.4-2006 2.4 GHz PHY requirements with a fixed data rate of 250 kbps and DSSS-OQPSK modulation. The transmitter path of the ADF7241 is based on a direct closed-loop VCO modulation scheme using a low noise fractional-N RF frequency synthesizer. The automatically calibrated VCO operates at twice the fundamental frequency to reduce spurious emissions and avoid PA pulling effects. The bandwidth of the RF frequency synthesizer is automatically optimized for transmit and receive operations to achieve best phase noise, modulation quality, and synthesizer settling time performance. The transmitter output power is programmable from −20 dBm to +4 dBm with automatic PA ramping to meet transient spurious specifications. An integrated biasing and control circuit is available in the IC to significantly simplify the interface to external PAs.
The receive path is based on a zero-IF architectu...