AMIS-49587_15 Datasheet, PDF (8/56 Pages) ON Semiconductor – Power Line Carrier Modem

AMIS−49587
GROUND
CDREF
CDA
3,3V SUPPLY
4 _{3 2 1 28 27 26}
5
25
6
24
7
23
8
22
9
21
10
20
11
19
12 13 14 15 16 17 18
CDD
Figure 4. Recommended Layout of the Placement of Decoupling Capacitors for PLCC−28
RX_OUT
RX_OUT is the output analog pin of the receiver low noise input op−amp. This op−amp is in a negative feedback configuration.
RX_IN
RX_IN is the positive analog input pin of the receiver low noise input op−amp. Together with RX_OUT and REF_OUT, an
active high pass filter is realized. This filter removes the main frequency (50 or 60 Hz) from the received signal. The filter
characteristics are determined by external capacitors and resistors. A typical application schematic can be found in paragraph
50/60 Hz suppression filter.
M50Hz_IN
M50HZ_IN is the mains frequency analog input pin. The signal is used to detect the zero crossing of the 50 or 60 Hz sine wave.
This information is used, after filtering with the internal PLL, to synchronize frames with the mains frequency. In case of direct
connection to the mains it is advised to use a series resistor of 1 MW in combination with two external clamp diodes in order
to limit the current flowing through the internal protection diodes.
RX_DATA
RX_DATA is a 5 V compliant open drain output. An external pull−up resistor defines the logic high level as illustrated in
Figure 5. A typical value for the pull−up resistance “R” is 10 kW. The signal on this output depends on the status of the data
reception. If AMIS−49587 waits for configuration RX_DATA outputs a pulse train with a 10 Hz frequency. After
Synchronization Confirm Time out RX_DATA = 0. If AMIS−49587 is searching for synchronization RX_DATA = 1.
+ 5V
R
Output
VSSD
Figure 5. Representation of 5V Safe Output
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