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AN2744 датащи(PDF) 22 Page - STMicroelectronics

номер детали AN2744
подробное описание детали  ST7538Q power line FSK transceiver
PDF  56 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2744 датащи(HTML) 22 Page - STMicroelectronics

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AN2744
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Figure 10
and Figure 11 show the measured response of the filter for both channels, loaded
with the CISPR reference network and with 5
Ω impedance. When loaded with the CISPR
network, the Tx passive filter gives an almost flat gain of nearly 3.5 dB around the
transmission carrier frequency. Applying a heavier load makes the frequency response
sharper and the gain at carrier frequency lower. This effect leads to a loss of about 7-8 dB
with a 5
Ω load for both channels.
Table 5.
Line coupling transformer specifications
Parameter
Value
Turn Ratio
1:1
Magnetizing Inductance
> 1 mH
Leakage Inductance
< 1 µH
DC total resistance
< 0.5
Ω
DC saturation current
> 2 mA
Interwinding capacitance
< 50 pF
Withstanding Voltage
4 kV
Figure 10.
Measured frequency response of the Tx passive filter for 72 kHz channel (typical)
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
1E+04
1E+05
1E+06
Freq (Hz)
CISPR
5
Ω load
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
1E+04
1E+05
1E+06
Freq (Hz)
CISPR
5
Ω load



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