ATPL230A datasheet(8/122 Pages) ATMEL

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ATPL230A [DATASHEET]

Atmel-43053J-ATPL230A-Datasheet_22-Sep-16

5.1.2

Filtering Stage

The filtering stage is composed by band-pass filters which have been designed to achieve high performance in field

deployments complying at the same time with the proper normative and standards.

The in-band flat response filtering stage does not distort the injected signal, reduces spurious emission to the limits

set by the corresponding regulation and blocks potential interferences from other transmission channels.

The filtering stage has three aims:



Band-pass filtering of high frequency components of the square waveform generated by the transmission stage



Adapt Input/Output impedances for optimal reception/transmission. This is controlled by TXRX signals



In some cases, Band-pass filtering for received signals

When the system is intended to be connected to a physical channel with high voltage or which is not electrically

referenced to the same point then the filtering stage must be always followed by a coupling stage.

5.1.3

Coupling Stage

The coupling stage blocks the DC component of the line to/from which the signal is injected/received (i.e.: 50/60 Hz of

the mains). This is carried out by a high voltage capacitor.

Coupling stage could also electrically isolate the coupling circuitry from the external world by means of a 1:1

transformer.

5.1.4

Reception Stage

The reception stage adapts the received analog signal to be properly captured by the ATPL230A internal reception

chain. Reception circuit is independent of the PLC channel which is being used. It basically consists of:



Anti aliasing filter (RC Filter)



Automatic Gain Control (AGC) circuit



Driver of the internal ADC

The AGC circuit avoids distortion on the received signal that may arise when the input signal is high enough to

polarize the protective diodes in direct region.

The driver to the internal ADC comprises a couple of resistors and a couple of capacitors. This driver provides a DC

component and adapts the received signal to be properly converted by the internal reception chain.

ATPL230A Datasheet(PDF) 8 Page - ATMEL Corporation