EQCO400T8
EQCO400T8 UTP Cable Equalizer
Features
• Multi-Rate Adaptive Equalization for UTP Cables
up to 500 Mbps
• Supports General 8B/10B Coded Signaling over
UTP
• Supports FireWire IEEE 1394b at S400, S200 and
S100 Data Rates
• Seamless Connection with any IEEE1394b
Compliant PHY
• Internal Termination Resistors for Low External
Discrete Count
• Fully Compatible with Power over Ethernet
(1)
• Carrier Detect and Mute Functionality with Direct
Light Emitting Diode Driving Capability
• Single 3.3V Supply
• Low-Power Operation
- 42 mA (140 mW) Active
- 4.25 mA (14 mW) Mute
• 16-pin, 0.65 mm Pin Pitch, 4 mm QFN Package
• Pb-free and RoHS Compliant
General Description
The EQCO400T8 is a multi-rate adaptive cable equal-
izer designed to restore signals received over Cat 5 or
Cat 6 Unshielded Twisted Pair (UTP) cable. For correct
operation, the signals must be NRZ (Non-Return-to-
Zero) encoded, DC-balanced with a maximum run
length of 10 bits and have a speed (edge rate) of
between 100 Mbps and 500 Mbps.
Typical Equalization Performance
Device
EQCO400T8
Bit Rate
(8B/10B Coding)
125 Mbps
250 Mbps
500 Mbps
Note 1:
2:
1394 Data Rate
S100
S200
S400
Range
(2)
using
Cat 5e
0m-85m
0m-75m
0m-50m
Cat 6
0m-85m
0m-85m
0m-75m
IEEE 802.3-2008, clause 33 - "Power over Ethernet" (formerly known as IEEE 802.3af)
Measured on UTP pairs 1, 2, 3 and 6 as per IEEE 1394-2008 using recommended Coilcraft magnetics as
per
Table 2-1.
2006-2016 Microchip Technology Inc.
DS60001310B-page 1
EQCO400T8
Table of Contents
1.0
2.0
3.0
4.0
Device Overview .......................................................................................................................................................................... 3
Application Information ................................................................................................................................................................. 9
Electrical Characteristics ............................................................................................................................................................ 11
Packaging................................................................................................................................................................................... 13
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DS60001310B-page 2
2006-2016 Microchip Technology Inc.
EQCO400T8
1.0
DEVICE OVERVIEW
The EQCO400T8 is ideally suited for long-haul IEEE
1394b-2002 connections over Category 5 or Category
6 Ethernet cable at the S400 data rate. It can also be
used at S200 and S100 data rates over even longer
cables, as illustrated in the typical long-haul connection
in
Figure 1-1.
The EQCO400T8 connects seamlessly
to any IEEE 1394b-2002 compliant physical layer
controller (PHY).
The achievable connection reach with the
EQCO400T8 depends on the input jitter tolerance of
the IEEE 1394 PHY and the quality of the connectors
and cables used.
Figure 1-1
shows the typical
performance with CAT5e and CAT6 cables under
nominal conditions.
FIGURE 1-1:
LONG-HAUL IEEE 1394B-2002, IEEE 1394-2008 CONNECTION
Up to 100 meters
IEEE
1394b
Compliant
PHY
EQCO400T
EQCO400T
CAT5/CAT6
UTP
IEEE
1394b
Compliant
PHY
2006-2016 Microchip Technology Inc.
DS60001310B-page 3
EQCO400T8
FIGURE 1-2:
EQCO400T8 PIN DIAGRAM (VIEWED FROM TOP)
NC
16
SDIp
1
NC
15
NC
14
GND
13
12
SDOp
VCC
2
11
VCC
SDIn
3
EQCO
400T.8
GND TAB
10
SDOn
NC
4
5
GND
9
8
NC
NC
6
CLI
7
LED
TABLE 1-1:
Pin Number
2, 11
5, 13
1, 3
12, 10
6
EQCO400T8 PIN DESCRIPTIONS
Pin Name
VCC
GND
SDIp/SDIn
SDOp/SDOn
CLI
Signal Type
Power
Power
LVDS Input
LVDS Output
Analog Output
Description
Connect to +3.3V power supply.
Connect to power supply ground.
Differential serial data input pair.
Differential serial data output pair.
Cable length indicator:
Analog voltage can be used to indicate the length of the cable
being equalized; this gives an indication of the amount of
equalization being applied. A higher output voltage results
from more compensation being used to recover the signal.
Leave unconnected when not used.
Carrier detect with light emitting diode driver.
High means a valid input signal, and SDOp/SDOn are turned on.
Low means no RX signal or the signal is too low, and SDOp/
SDOn are muted.
This pin can source up to 3 mA to directly drive an LED.
Leave unconnected when not in use.
Leave unconnected.
7
LED
Output
4, 8, 9, 14, 15, 16 NC
DS60001310B-page 4
2006-2016 Microchip Technology Inc.
EQCO400T8
FIGURE 1-3:
EQCO400T8 BLOCK DIAGRAM SHOWING ELECTRICAL CONNECTIONS
EQCO400T
Carrier Detect
/Mute
LED
SDIp
SDIn
Equalizer
Core
SDOp
SDOn
Output Driver
CLI
1.1
SDIp/SDIn
1.3
CLI
SDIp/SDIn together form a differential input pair that is
connected to the receive signal pair of the cable. It is
the differential voltage between these pins that the
EQCO400T8 analyzes and adaptively equalizes for
signal level and frequency response. The equalizer
automatically detects and adapts to signals with
different edge rates, e.g. S100, S200 and S400.
Both SDI+ and SDI- inputs are terminated by 50Ω to
VCC on-chip. It is advised to isolate the inputs from
the UTP via a transformer, as shown in
Figure 2-1.
The EQCO400T, being a fully analog equalizer, has a
continuous transfer function with respect to the equal-
ization applied. CLI (Cable Length Indicator) is an ana-
log output. The voltage on the pin is proportional to the
amount of equalization being applied.
CLI can be used qualitatively to indicate the length of
the cable being equalized; the higher the voltage, the
longer the cable. However the CLI pin voltage depends
on a number of factors, including connector quality,
device temperature and to a certain degree on chip-to-
chip variations, and as such cannot be used for
accurate cable length measurement.
Figure 1-4
illustrates the voltage at CLI for a typical
CAT6 cable.
1.2
SDOp/SDOn
SDOp/SDOn together form a differential pair outputting
the reconstructed far-end transmit signal. The signals
can be connected via capacitive coupling directly to the
RX signal pair of a standard IEEE1394b PHY.
The EQCO400T8 uses Current Mode Logic (CML)
drivers with source matching for the 110Ω
transmission line.
2006-2016 Microchip Technology Inc.
DS60001310B-page 5
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