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AN2744 Datasheet(PDF) 49 Page - STMicroelectronics

Part # AN2744
Description  ST7538Q power line FSK transceiver
PDF  56 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2744 Datasheet(HTML) 49 Page - STMicroelectronics

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7.3
110-132.5 kHz dual channel coupling circuit
In this paragraph the dual channel application circuit for CENELEC band B and C is
suggested. The 110 and 132.5 kHz channel frequencies of the ST7538Q transceiver are
suitable for home automation applications and in general for applications not subject to the
European AMR regulations.
Table 12
gives the values for changing a few components to obtain a dual channel line
coupling interface at 110 kHz (CH1) and 132.5 kHz (CH2)
Table 12.
List of components to be modified for the 110-132.5 kHz dual channel coupling
Reference
Value
L5
47 µH
L6
22 µH
L7
220 µH
C16
2.2 nF
C20
6.8 nF
C27
82 nF
C29
220 nF
R18
390
Ω
R21
6.8
Ω



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