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 MAX2990 PLC Baseband

Integrated Band Select Filter, AGC, and 10-Bit ADC for Rx Path

Integrated Wave-Shaping Filter, Programmable Predriver Gain, and 10-Bit DAC for Tx Path

Variable Sampling Rate Up to 1.2Msps

Built-In 60dB Dynamic Range AGC and DC Offset Cancellation

Programmable Filters Operate in the CENELEC, FCC, and ARIB Frequency Bands

Single 3.3V Power Supply

70mA Typical Supply Current (Half-Duplex Mode)

Extended Operating Temperature Range

MAX2991应用:

Automatic Meter Reading

Home Automation

Heating Ventilation and Air Conditioning (HVAC)

Building Automation

Industrial Automation

Lighting Control

Sensor Control and Data Acquisition (SCADA)

Remote Monitoring and Control

Security Systems/Keyless Entry

Smart Grid

图1。MAX2991功能方框图

 图2。MAX2991典型应用电路框图

图3。MAX2990和MAX2991方框图

MAX2990/MAX2991评估板

The MAX2990 evaluation kit is a highly integrated chipset including the MAX2990 baseband (BB) and MAX2991 analog front end (AFE). This system transfers data over 120V or 240V AC powerlines, DC, or cold wire. The MAX2990 baseband uses an orthogonal frequency division multiplexing modulation (OFDM) technique that can be configured to operate in the 10kHz to 490kHz frequency band.

The MAX2990 evaluation kit contains two modems and the evaluation software. It is assembled and preconfigured to demonstrate performance under a variety of international regulatory requirements.

MAX2990/MAX2991评估板主要特性:

Optimized to Operate with the MAX2990 PLC Baseband

Integrated Band Select Filter, AGC, and 10-Bit ADC for Rx Path

Integrated Wave-Shaping Filter, Programmable Predriver Gain, and 10-Bit DAC for Tx Path

Variable Sampling Rate Up to 1.2Msps

Built-In 60dB Dynamic Range AGC and DC Offset Cancellation

Programmable Filters Operate in the CENELEC, FCC, and ARIB Frequency Bands

Single 3.3V Power Supply

70mA Typical Supply Current (Half-Duplex Mode)

Extended Operating Temperature Range           

MAX2990/MAX2991评估板应用:

Automatic Meter Reading

Building Automation

Heating Ventilation and Air Conditioning (HVAC)

Home Automation

Industrial Automation

Lighting Control

Remote Monitoring and Control

Security Systems/Keyless Entry

Sensor Control and Data Acquisition

Voice-Over-Powerline


图4.智能电表解决方案框图

图4.71M6543F/71M6543H工商业用多相电表SoC方案框图

图5.71M6543F/71M6543H低成本提高精度和设计灵活性电表SoC方案框图

图6.电网监测系统解决方案框图

图7.wye配置三相功率监测应用案例框图

图8。Maxim提供的有线/无线和串行通信方案框图


图9.智能电网通信架构图

图10.78M6618功率和电能测量应用框图
详情请见:
http://datasheets.maxim-ic.com/en/ds/MAX2991.pdf
和
http://www.maxim-ic.com/solutions/guide/smart-grid/smart-grid-solutions-guide-book.pdf