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AN2744 датащи(PDF) 48 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) 48 Page - STMicroelectronics

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Application ideas
AN2744
48/56
The schematic above is based on a simple diode-capacitor (D1-C1) circuit improved with an
LM393 comparator so that:
●
The comparator eliminates the diode reverse voltage
●
The feedback network (R3/R2) introduces a gain of 4 to improve the performance
against low amplitude signals
In the end this circuit gives on DC_OUT line a DC voltage proportional to the AC peak to
peak level at the input. Figure 49 shows the measured behavior of this circuit with a given
pure sinusoidal waveform at the input. The DC_OUT signal shall be converted by the
application microcontroller through an integrated A/D converter.
Figure 48.
Peak detector electrical schematic
Rx_IN
R1
100k
R2
18k
R3
82k
R4
4.7k
+
-
U1A
LM393
3
1
8
4
2
5V
D1
1N4148
C1
100n
DC_OUT
Rx_IN
R1
100k
R2
18k
R3
82k
R4
4.7k
+
-
U1A
LM393
3
1
8
4
2
5V
D1
1N4148
C1
100n
DC_OUT
Figure 49.
Measured DC_OUT vs. AC_IN peak detector performance
0
500
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3000
0
200
400
600
800
1000
1200
AC_IN [mVpp]
0
500
1000
1500
2000
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3000
0
200
400
600
800
1000
1200
AC_IN [mVpp]



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