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PDF ( 数据手册 , 数据表 ) EQCO875SC.3

零件编号 EQCO875SC.3
描述 Single-Coax Transceiver
制造商 Microchip
LOGO Microchip LOGO 


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EQCO875SC.3 数据手册, 描述, 功能
EQCO875SC.3/EQCO850SC.3
EQCO875SC.3/EQCO850SC.3 Single-Coax Transceiver for
Fast Ethernet
Features
• Combined Transmitter and Receiver with an
Integrated Equalizer to Form a Full-Duplex
Bidirectional Connection over a Single 75Coax
Cable (EQCO875SC.3) or 50Coax Cable
(EQCO850SC.3)
• Compatible with FX Version of Fast Ethernet
• Low-Power: 205 mW from Single 3.3V Supply
• Integrated Termination Resistors for Low External
Discrete Count
• Fully Supports PoE-Based Power and Data
Signal Distribution Over Coax
• 16-Pin, 0.65 mm Pin Pitch, 4 mm QFN Package
• Pb-Free and RoHS Compliant
Applications
This solution is useful and economical for many
markets and applications, including the following:
• Camera Networks
- Home Security, Surveillance, Industrial/
Inspection, Medical Cameras
• Home Networking over Coax Infrastructure
- When Cat5 or Cat6 cabling is not available
and existing 75coax is not used for analog
TV signals
• TV, STB, PVR Connections Including Inter-Room
Links
TABLE 1: TYPICAL DEVICE PERFORMANCE FOR EQCO875SC.3
Version
EQCO875SC.3 Range Using
RG11
RG6 (Ø 5 mm)
EQCO875SC.3
225m
150m
TABLE 2: TYPICAL DEVICE PERFORMANCE FOR EQCO850SC.3
Version
RG174
EQCO850SC.3 Range Using
RTK
EQCO850SC.3
40m 70m
RG58
70m
2009-2016 Microchip Technology Inc.
DS60001314A-page 1







EQCO875SC.3 pdf, 数据表
EQCO875SC.3/EQCO850SC.3
3.1 Guidelines for PCB Layout
Because signals are strongly attenuated by long cables,
special attention must be paid on the PCB layout
between the coaxial connector and the EQCO875SC.3.
The EQCO875SC.3 should be placed as close as is
practical to the coaxial connector. The trace between
the coaxial connector and the SDIO pin of the
EQCO875SC.3 must be a 75(50for
EQCO850SC.3) trace referenced to GND. To avoid
noise pickup, other traces carrying digital signals or
fast-switching signals should be placed as far away as
possible from this trace.
The ground layout on the EQCO875SC.3 is crucial to
the EMC and EMI performance of the circuit. The
AGND connection should be connected directly to the
body of the connector as shown. Similarly, AVCC
FIGURE 3-2:
TYPICAL PCB LAYOUT
should be decoupled directly to the connector body
(see the position of C9). The termination resistor (R1
in Figure 3-1 and Figure 3-2) must have its ground
connection at the connector body. The impedance of
all the traces must be well controlled, including on the
connector itself. To compensate for parasitic
capacitances, the ground and power planes
underneath L1 and part of the coax connector need to
be removed, as indicated by the green areas on
Figure 3-2.
The SDIp/SDIn and SDOp/SDOn differential traces
should be laid out as 100differential traces.
The following diagram shows the layout of the critical
section of the PCB corresponding to the circuit of
Figure 3-1 from the coax connector to the twin
differential pairs:
DS60001314A-page 8
2009-2016 Microchip Technology Inc.







EQCO875SC.3 equivalent, schematic
EQCO875SC.3/EQCO850SC.3
NOTES:
DS60001314A-page 16
2009-2016 Microchip Technology Inc.










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