STCOM datasheet(9/58 Pages) STMICROELECTRONICS

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STCOM

Description

1.2

Power line communication (PLC) sub-system

The STCOM device embeds a full narrow band power line communication (NB-PLC) sub-

system, comprising the RTE, DFE, AFE and line driver.

The AFE and line driver have been designed for a differential power line interface; however,

single-ended operation is possible for simpler hardware application development.

The DC to 500 kHz signal bandwidth is supported, targeting a number of possible NB-PLC

solutions.

1.2.1

Real-time engine (RTE)

To match a performance required by emerging NB-PLC standards, the STCOM embeds

a proprietary dedicated reprogrammable machine, the real-time engine. It is able to address

specific functionalities exploited by OFDM and the ones adopted in the current and future

NB- PLC standards in an efficient way.

1.2.2

Digital front-end (DFE)

Transmission and reception filter chains

The DFE includes programmable transmission/reception digital filter chains to fit the signal

bandwidth in different PLC modulation cases. The ADC and DAC clock frequencies are

controlled by the DFE to get the right sample rate fitting the filter chain configuration.

Automatic gain control (AGC)

The DFE implements the automatic gain control (AGC) block for the PGA, whose purpose is

to adapt the signal to the ADC dynamic.

Current control (CC)

The DFE includes also the current control (CC) block for the line driver to limit the maximum

output current.

1.2.3

Analog front-end (AFE)

Receiving chain

The STCOM AFE features a programmable gain amplifier (PGA) and a dedicated analog-to-

digital converter (ADC) to achieve high RX sensitivity and a wide input range.

Transmission chain

The transmitted signal, generated in the digital domain, is fed into a dedicated digital-to-

analog converter (DAC).

The DAC output is then fed into a predriver for buffering and applying an additional gain

before the line driver.

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