MaximMAX2991动力线通信模拟前端解决方案.docx

Maxim MAX2991动力线通信模拟前端解决方案 关键字：消费类电子,智能电表,工业控制,工厂自动化,HVAC Maxim 公司的MAX2991是动力线通信(PLC)模拟前端收发器,具有优异的性能和降低系统成本.MAX2991采用OFDM信号在动力线上进行传输,工作频率10kHz到490kHz,可编程滤波器和 CENELEC, FCC,ARIB标准兼容.单电源3.3V工作,主要用在自动读表(AMR),家庭自动化,HVAC,建筑物自动化,工厂自动化,照明控制,传感器控制和数据采集(SCADA),遥测和遥控.本文介绍了MAX2991主要特性,方框图,典型应用框图和MAX2990/MAX2991评估板主要特性以及智能电网解决方案相关框图.The MAX2991 power-line communication analog front-end (AFE) is a state-of-the-art integrated circuit that delivers high integration and superb performance, while reducing the total system cost. The MAX2991 is the first AFE specifically designed for OFDM (orthogonal frequency division multiplexing) modulated signal transmission over power lines. Operating in the 10kHz to 490kHz band, the programmable filters allow compliance with CENELEC, FCC, and ARIB standards using the same device.?The MAX2991 transceiver provides two main paths: transmit (Tx) path and receive (Rx) path. The transmit path injects an OFDM modulated signal into the AC or DC line. The transmit path is composed of a digital IIR filter, digital-to-analog converter (DAC), followed by a lowpass filter, and a preline driver. The receiver path is for the signal enhancement, filtering, and digitization of the received signal. The receiver is composed of a lowpass and a highpass filter, a two-stage automatic gain control (AGC), and an analog-to-digital converter (ADC). The integrated AGC maximizes the dynamic range of the signal up to 60dB, while the lowpass filter removes any out-of-band noise, and selects the desired frequency band. The ADC converts the enhanced and amplified input signal to a digital format. An integrated offset cancellation loop minimizes the DC offset.?The MAX2991, along with the MAX2990 PLC baseband modem, delivers the most cost-effective data communication solution over power-line networks in the market. The MAX2991 is specified over the -40NC to +85NC temperature range and is available in a 48-pin LQFP package.MAX2991主要特性:?Optimized to Operate with the