This document provides a design guide for the ST7540 FSK powerline transceiver, including the power supply, modem and crystal oscillator, and line coupling interface sections. The reference design allows evaluation of the ST7540 features, particularly its transmitting and receiving performances on the power line.
This document serves as a design guide for the ST7540 FSK powerline transceiver reference design, specifically the EVALST7540-2 board. It details the construction of a small, high-performance powerline node compliant with European CENELEC standard A-band specifications for automatic meter reading (AMR). The guide covers the board's three main sections: power supply, modem/oscillator, and line coupling interface.
| FSK carrier frequency | 72 kHz |
|---|---|
| Transmitting output voltage level | 2.25 V rms |
| Transmitting output current limit | 500 mA rms |
| Minimum detectable Rx signal | 48 dBuV rms |
| AC mains voltage range | 85 to 265 Vv |
| Output power | 5.6 W |
The efficiency is 70% at an output power of 3.5W.
It complies with the European CENELEC standard A-band specified for automatic meter reading.