AN3213 datasheet(38/64 Pages) STMICROELECTRONICS

Part #	AN3213

Description	ST7570 S-FSK power line networking system-on-chip

PDF	64 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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38 / 64 page

ST7570 demonstration board description

AN3213

38/64

Doc ID 17429 Rev 1

Figure 32.

Conducted emissions: transmission spectrum, quasi-peak measurement,

150 kHz - 30 MHz, neutral-to-earth, as per EN50065-1

7.2.2

Noise immunity

The tests on immunity against white noise (AWGN) and narrow-band interferers (NBI) are

based on two ST7570 demonstration boards, performing a unidirectional point-to-point

communication. The first board transmits a message with a known bit pattern, while the

receiving board passes the received message to the ST7570 GUI software, which

calculates the percentage of wrong bits (BER). The tests have been performed at 1200 and

2400 baud.

Figure 33 shows the test environment used to perform noise immunity tests.

The noise (AWGN or NBI) is produced by a waveform generator and injected into the

network through an AC coupling circuit; this circuit is mandatory to protect the waveform

generator output.

Figure 33.

Noise immunity test setup

AN3213 Datasheet(PDF) 38 Page - STMicroelectronics