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Serial

Interface

Serial

Interface

DAC

PGA

LPF

Line Coupling Interface

Bandpass Filter

C2000 MCU

AFE031

Phase

Neutral

AFE031

SBOS531D – AUGUST 2010 – REVISED MAY 2012

www.ti.com

APPLICATION INFORMATION

GENERAL DESCRIPTION

The AFE031 is an integrated powerline communication analog front-end (AFE) device built from a variety of

functional blocks that work in conjunction with a microcontroller. The AFE031 provides the interface between the

microcontroller and a line coupling circuit. The AFE031 delivers high performance and is designed to work with a

minimum number of external components. Consisting of a variety of functional and configurable blocks, the

AFE031 simplifies design efforts and reduces the time to market of many applications.

The AFE031 includes three primary functional blocks:

•

Power Amplifier (PA)

•

Transmitter (Tx)

•

Receiver (Rx)

The AFE031 also consists of other support circuitry blocks that provide zero crossing detection, an additional

two-wire communications channel, and power-saving biasing blocks (see the Functional Block Diagram). All of

these functional blocks are digitally controlled by the microcontroller through the serial interface (SPI).

Figure 24 shows a typical powerline communications application system diagram. Table 1 is a complete list of

the sections within the AFE031.

Figure 24. Typical Powerline Communications System Diagram

Table 1. Block Descriptions

BLOCK

DESCRIPTION

The PA block includes the power amplifier and associated pedestal biasing circuitry

The Tx block includes the Tx_Filter and the Tx_PGA

The Rx block includes the Rx PGA1, the Rx Filter, and the Rx PGA2

ERx

The ER block includes the two-wire receiver

ETx

The ER block includes the two-wire transmitter

DAC

The DAC block includes a digital-to-analog converter

The ZC block includes both zero crossing detectors

REF1

The REF1 block includes the internal bias generator for the PA block

The REF2 block includes the internal bias generators for the Tx, Rx, ERx, and ETx

REF2

blocks

Product Folder Link(s): AFE031

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