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PDF EQCO875SC.3 Data sheet ( Hoja de datos )

Número de pieza EQCO875SC.3
Descripción Single-Coax Transceiver
Fabricantes Microchip 
Logotipo Microchip Logotipo



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No Preview Available ! EQCO875SC.3 Hoja de datos, Descripción, Manual

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

1 page




EQCO875SC.3 pdf
EQCO875SC.3/EQCO850SC.3
FIGURE 1-3:
EQCO875SC.3 BLOCK DIAGRAM SHOWING ELECTRICAL CONNECTIONS
EQCO875SC.3
SDIp
SDIn
Input
Pre-Driver
Active Signal
Splitter/Combiner
SDIO
REF
Transmit
Wake-Up
Detection
Equalizer
Core
SDOp
SDOn
RX Output
Driver
1.1 SDIp/SDIn
SDIp/SDIn together form a differential input pair. The
serial data received on these pins will be transmitted on
SDIO. The Input Pre-Driver automatically corrects for
variations in signal levels and different edge slew rates at
these inputs before they go into the Active Splitter/
Combiner for transmission over the coax.
Both SDIp and SDIn inputs are differentially terminated by
110on-chip. The center of the 110is connected to
DGND with a 10 kresistor for DC biasing. The inputs
also have protection diodes to ground for ESD purposes.
These inputs should always be capacitively coupled to the
FX output of the Ethernet PHY. A Transmit Wake-Up
detection circuit puts both the Input Pre-Driver and the
Active Signal Splitter/Combiner into a low-power mode
when no signal is detected on the SDIp/SDIn signal pair.
1.2 SDIO/REF
The signal on the SDIO pin is the sum of the incoming
signal (i.e. the signal transmitted by the EQCO875SC on
the far-end side of the coax) and the outgoing signal (i.e.
the signal created based on SDIp/SDIn). The far-end
signal is extracted by subtraction of the near-end signal,
and it is this voltage that the equalizer analyses and
adaptively equalizes for level and frequency response
based on the knowledge that the originating signal is 4B/
5B encoded before transmission.
The REF signal carries a precise anti-phase current to the
transmit current on SDIO. REF must be connected
directly to AGND at the connector (see Figure 3-2) via a
resistor precisely matched to the impedance of the
coaxial cable used.
2009-2016 Microchip Technology Inc.
1.3 SDOp/SDOn
SDOp/SDOn together form a differential pair outputting
the reconstructed far-end transmit signal. The
EQCO850SC-HS uses LVDS drivers with source
matching for a 100transmission line. This LVDS
signal can normally be connected (subject to input
common-mode requirements) directly to the RX signal
pair of a standard LVDS receiver.
1.4 OPT0, OPT1
Connect Opt0 to DGND and Opt1 to DVCC to enable
Fast Ethernet mode.
1.5 CLK, DAT Pins
These pins are normally used to access an internal
register during production test. Connect them to DGND
for normal operation. They should not be left floating.
DS60001314A-page 5

5 Page





EQCO875SC.3 arduino
EQCO875SC.3/EQCO850SC.3
5.0 PACKAGING INFORMATION
5.1 Package Marking Information
16-Lead Plastic Quad Flat, No Lead Package – 4x4x0.9 mm Body [QFN]
16-Lead QFN (4x4x0.9 mm)
Example
PIN 1
YYWWNNN
PIN 1
EQCO
875SC.3
YYWWNNN
Legend:
XX...X
YY
WW
NNN
*e3
Part number
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code (optional)
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( )
can be found on the outer packaging for this package. e3
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
2009-2016 Microchip Technology Inc.
DS60001314A-page 11

11 Page







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