AN4068 datasheet(20/63 Pages) STMICROELECTRONICS

20 / 63 page

ST7580 reference design description

AN4068

20/63

Doc ID 022923 Rev 2

7.1

Line coupling section

The line coupling section is made up of four different circuits: the transmission active filter,

the reception passive filter, the power line coupling, and the zero crossing coupling.

All four sections are described below. For each section, calculations and measured behavior

are reported.

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

Actual components used in the ST7580 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 sensitivity to these possible variations, simulated responses are also included,

with a Montecarlo statistical analysis of response variation vs. spread of component value.

For the transmission active filter, C0G/NPO type capacitors are required to guarantee

linearity and stability for any signal amplitude and frequency.

Figure 6.

Line coupling section schematics

EMIF06-MSD02N16(1)

MicroQFN 16L 3.5x1.2 mm

STM32F103CBT6(1)

LQFP48

USBLC6-2P6(1)

SOT-666

8 MHz

XTAL-HC49U

ST parts on board.

Table 3.

Bill of material (continued)

Reference

Value

Description

AN4068 데이터시트(PDF) 20 Page - STMicroelectronics