MAX2991

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 device, 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 -40°C to +85°C temperature range and is available in a 48-pin LQFP package. An integrated offset cancellation loop minimizes the DC offset. The MAX2991 power-line communication analog frontend (AFE)is a state-of-the-art integrated circuit that delivers high integration and superb performance, while reducing the total system cost. 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.

The features of ADA4930-1 can be summarized as (1)optimized to operate with the MAX2990 PLC baseband; (2)integrated band select filter, AGC, and 10-Bit ADC for Rx Path; (3)integrated wave-shaping filter, programmable predriver gain, and 10-Bit DAC for Tx path; (4)variable sampling rate up to 1.2Msps; (5)built-in 60dB dynamic range AGC and DC offset cancellation; (6)programmable filters operate in the CENELEC, FCC, and ARIB frequency bands; (7)single 3.3V power supply; (8)70mA typical supply current (half-duplex mode); (9)extended operating temperature range.

The absolute maximum ratings of ADA4930-1 are (1)VDD to GND: -0.3V to +3.9V; (2)all other inputs/outputs: -0.3V to +3.9V; (3)continuous power dissipation (TA = +70°C)48-Pin LQFP (derate 25mW/°C above +70°C): 1535mW; (4)operating temperature range: -40°C to +85°C; (5)junction temperature: +150°C; (6)storage temperature range: -60°C to +150°C; (7)lead temperature (soldering, 10s): +300°C.