ST7570 datasheet(20/26 Pages) STMICROELECTRONICS

Numer części	ST7570

Szczegółowy opis	S-FSK power line networking system-on-chip

PDF	26 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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20 / 26 page

Physical layer

ST7570

20/26

Doc ID 17526 Rev 2

Physical layer

The ST7570 embeds a IEC-61334-5-1 PHY layer, which is based on the S-FSK (spread

FSK) modulation technique.

9.1

S-FSK principles

The S-FSK modulation technique is aimed at strengthening the classical FSK by adding

higher robustness against narrow-band interferers typical of a spread-spectrum approach.

Non-return-to-zero (NRZ) coding is used to map the binary data “0” or “1” to sinusoidal

carriers at frequencies f0 and f1 (Figure 11).

Figure 11.

S-FSK waveform (time domain)

The absolute frequency deviation |f0 - f1| is at least 10 kHz, in order to reduce the probability

that a narrow-band interferer could corrupt both carriers at the same time.

f0 and f1 can be set at any value in CENELEC bands A, B, D.

Figure 12.

S-FSK waveform (frequency domain)

ST7570 Arkusz danych(PDF) 20 Page - STMicroelectronics