AN4444 datasheet(25/68 Pages) STMICROELECTRONICS

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AN4444

ST7590 reference design description

8.1

Line coupling section

The line coupling section is composed of five different subsections: the line driver, the power

line coupling, the reception filter, the optional reception amplifier and the zero crossing

coupling.

All subsections are described from Section 8.1.1: Line driver to Section 8.1.4: Zero crossing

coupling on page 35. For each subsection, calculations and measured behavior are

reported.

The frequency response of the filters is usually sensitive to tolerance of component values.

Actual components used in the ST7590 reference design have the following tolerances:

± 20% for the X1 capacitor and the coils, ± 5% for SMD ceramic capacitors, ± 1% for SMD

resistors.

To evaluate the sensitivity to these possible variations, simulated responses are also

included, with Montecarlo statistical analysis of response variation vs. the spread of

component values.

For the line driver, C0G/NPO type capacitors are required to guarantee linearity and stability

against signal amplitude and frequency.

EMIF06-MSD02N16(1)

EMI / ESD protection -

MicroQFN 16L

ST7590(1)

QFN48 with exposed pad

100

STM32F103RGT7(1)

LQFP64

101

TL082ID(1)

General purpose dual op amp

- SO8

102

USBLC6-2P6(1)

SOT-666

103

8 MHz

XTAL-HC49U

104

XTAL-HC49U

1. ST parts on board.

Table 4. Bill of materials (continued)

Item Qty.

Reference

Value

Description

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