EQCO400T8 Datasheet - Mouser Electronics

EQCO400T8 Datasheet - Mouser Electronics
EqcoLogic NV
Engineering Information
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EQCO400T8 - UTP Cable Equalizer
1.1
Features









Multi-Rate Adaptive Equalization for UTP cable up to 500 Mbps
Supports general 8B/10B coded signalling over UTP
Supports Fire-Wire 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
[2]
Carrier Detect and Mute functionality with direct Light Emitting Diode driving capability
Single 3.3V supply
Low Power
 42mA (140mW) active
 4.25mA (14mW) mute


1.2
16-pin, 0.65mm pin pitch, 4mm QFN package
Pb-free and RoHS compliant
Typical Equalization Performance
Device
EQCO400T8
Bit Rate
(8B/10B coding)
1394
Data rate
125 Mbps
250 Mbps
500 Mbps
S100
S200
S400
Range1 using
Cat 5e
Cat 6
0m - 85m
0m - 75m
0m-50m
0m - 85m
0m - 85m
0m-75m
Table 1: Typical Equalization Performance
1
Measured on UTP pairs 1,2 and 3,6 as per IEEE 1394-2008 using recommended Coilcraft magnetics as per Table 6
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2
Functional Description
2.1
Overview
The EQCO400T8 is a multi-rate adaptive cable equalizer, 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-returnto-zero) encoded, DC balanced with a maximum run length of 10 bits, and have a speed (edge rate) of
between 100Mbps and 500Mbps.
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 Figure 1. The EQCO400T8 connects seamlessly to any IEEE 1394b-2002 compliant
physical layer controller (PHY).
Figure 1 illustrates a typical long-haul connection:
Up to 100metres
IEEE 1394b
Compliant
PHY
EQCO400T
IEEE 1394b
Compliant
PHY
CAT5/CAT6
UTP
EQCO400T
Figure 1: Long-haul IEEE 1394b-2002, IEEE 1394-2008 connection
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 shows the typical performance
with CAT5e and CAT6 cables under nominal conditions.
EQCO400T
Carrier Detect
/Mute
LED
SDIp
SDIn
SDOp
Equalizer
Core
Output Driver
SDOn
CLI
Figure 2: EQCO400T8 block diagram showing electrical connections
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2.2
Package and Pinout
NC
NC
NC
GND
16
15
14
13
SDIp
1
12
SDOp
VCC
2
11
VCC
SDIn
3
10
SDOn
NC
4
9
NC
ECQO
400T.8
GND TAB
5
6
7
8
GND
CLI
LED
NC
Figure 3: EQCO400T8 Pin Layout (viewed from top)
2.3
Pin Descriptions
Pin #
Pin Name
Signal Type
Description
2, 11
VCC
Power
Connect to +3.3V power supply
5, 13
GND
Power
Connect to power supply ground
1, 3
SDIp/SDIn
LVDS Input
Differential Serial Data Input pair
12, 10
SDOp/SDOn
LVDS Output
Differential Serial Data Output pair
6
CLI
Analog Output
7
LED
Output
4, 8, 9, 14,
15, 16
NC
Cable Length Indicator:
Analog voltage that can be used to indicate the length of the
cable being equalized; 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  valid input signal; SDOp/SDOn are turned on
LOW  no rx signal/signal too low; SDOp/SDOn are muted
Can source up to 3mA to directly drive a LED
Leave unconnected when not used
Leave unconnected
Table 2: Device Pin List
2.3.1
SDIp/SDIn
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 analyses 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.
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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 8.
2.3.2
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.
2.3.3
CLI
The EQCO400T, being a fully analog equalizer, has a continuous transfer function with respect to the
equalization applied. CLI (Cable length Indicator) is an analog 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 4 illustrates the voltage at CLI for a typical CAT6 cable.
2.6
2.4
Voltage (V)
2.2
2
1.8
1.6
1.4
1.2
10
20
30
40
50
60
70
Cable Length (m)
80
90
100
Figure 4: CLI voltage as a function of cable length (Systimax CAT6 cable)
2.3.4
LED
LED is an output that indicates the detection of sufficient differential signal power at SDIp/SDIn for a link
to be established.
If the received signal at the serial inputs is either not present or too small for proper reconstruction of
the output (i.e. a signal with amplitude < 40mV) the voltage on LED is driven LOW; if sufficient signal
power is detected, the voltage at LED will be driven HIGH. When HIGH, the pin can source up to 3mA
enabling it to be used to directly drive a Light Emitting Diode. The Light Emitting Diode will thus be ON
when a signal is detected, and OFF otherwise. It is advised to use a high efficiency Light Emitting Diode.
As the output from this pin is current limited no series resistor is required.
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2.4
Equalizer Operation
Figure 5: Principle of Equalizer Operation
The EQCO400T8 is an equalizer with unique characteristics [3]:

Auto-adaptive
The equalizer controls a multiple pole analog filter which compensates for attenuation of the
cable, as illustrated in Figure 5. The filter frequency response needed to restore the signal is
automatically determined by the device using a time-continuous feedback loop that measures the
frequency components in the signal. Upon the detection of a valid signal, the control loop
converges within a few microseconds.

Variable gain
The EQCO400T8 has variable gain to work independently of the transmit amplitude of the line
driver.
[1]
The equalizer can be used with any IEEE1394b compliant transmitter. The standard requires a
differential transmit amplitude in the range of 475mV to 800mV.

Multi-speed
The EQCO400T8 works at data rates from 100Mbps to 500Mbps. In particular, it supports the
S400, S200 and S100 data rates specified in the IEEE Standard 1394b-2002.

Carrier detect/auto-mute to save power
The EQCO400T8 will automatically mute its output driver when no incoming signal is present. The
EQCO400T8 estimates the remote transmit amplitude by measuring the low frequency
components of the signal. When the low frequency amplitude is 190mV (approx) or higher the
output stage is turned on. Auto-mute reduces the power consumption from 140mW to less than
14mW.
Example equalizer performance measurements can be found in Appendix 1.
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3
Electrical Specifications
3.1
Absolute Maximum Ratings
Stresses beyond those listed under this section may cause permanent damage to the device. These are
stress ratings only and are not tested. Functional operation of the device at these or any other
conditions beyond those indicated in the operational sections are not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Parameter
Conditions
Storage Temperature
Ambient Temperature
Operating Temperature
Supply Voltage to Ground
DC Input Voltage
DC Voltage to Outputs
Output current into Outputs
Electro Static Discharge (ESD)
HBM
Electro Static Discharge (ESD)
contact
Latch-Up Current
Min
Power Applied
Normal Operation
(VCC=3.3V+5%)
Outputs Low
JEDEC EIA/JESD-A114A
IEC 61000-4-2
Typ
Max
-65
-55
-40
+150
+125
+85
-0.5
-0.5
-0.5
+4.0
+4.0
+4.0
90
Units
o
C
C
o
C
o
>3.3
V
V
V
mA
kV
>8
kV
>200
mA(DC)
Table 3: Absolute Maximum Ratings
3.2
Current Consumption
Description
Max
Unit
No input signal, LED is low, Output driver disabled
4.25
mA
Valid input, LED is high, Output driver enabled
42.5
mA
Table 4: Maximum Current Consumption @ 3.3V
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3.3
Electrical Characteristics
Parameter
Description
VCC
Signalling rate (NRZ, 8B/10B encoded)
Min
Typ
Max
Unit
3.135
3.3
3.465
V
100
500
600
Mbps
800
mV
SDIp/SDIn inputs
Differential
input voltage
swing
LVDSImin
Input R
|VSDIp – VSDIn| measured at cable input
4752
Minimum differential input for fully
reconstructed output
Common-mode input voltage
40
mV
3.33
V
Single ended; to VCC
50
Ω
440
mV
VCC LVDSo/2
V
VCC
V
SDOp/SDOn Outputs
LVDSo
SDOoff
Differential output voltage swing
|VSDOp - VSDOn|
(50Ω load to VCC on each output)
LED is HIGH
Common-mode output voltage
Output R
Output voltage with disabled driver
Single ended; LED is LOW
Single ended; to VCC
Rise/Fall time
20% to 80%
100
Voh
Diff. input voltage at cable input > 250mV
1.5
Vol
Diff. input voltage at cable input < 40mV
GND
Voh
Output voltage at minimum cable length
1.2
V
Vol
Output voltage at maximum cable length
2.6
V
55
190
Ω
260
ps
LED
VCC
V
0.8
V
CLI
Table 5: Electrical Characteristics (Over the Operating Range)
2
3
Per IEEE1394-2008 specification. Not a hard requirement but recommended for maximum cable reach as per Figure 1
SDI Inputs are terminated to 3V3 internally. It is recommended to AC couple these signals to avoid high DC currents from flowing
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4
Package Drawing
The EQCO400T8 is packaged in a 16 pin Micro Lead frame Package (MLP) also known as Quad Flat No Lead (QFN)
package. The package outline conforms to JEDEC MO-220.
Dimensions in Figure 6 and Figure 7 are in millimeters.
Pin 1 Top Mark
4.00+/-0.1
0.90
14
13
XX
EQCO
400T.N
16
15
1
0.45
12
2
10
3
9
4
2.10
11
8
0.20
7
6
0.65
0.25
0.60
0.00-0.05
5
2.15
2.90
4.35
Figure 6: Package Drawing viewed from Top - Side - Bottom4
0.30
0.65
Figure 7: Recommended PCB Footprint
4
The “N” on the package refers to the variant mark, being “5” for EQCO400T-5, “7” for EQCO400T-7 or “8” for EQCO400T-8
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5
Application Information
5.1
Typical Application Circuit
Figure 8 illustrates a typical schematic implementation. In this diagram data is transmitted on pins 1,2
and received on pins 3,6 of the RJ45.
Coilcraft
0603USB-222ML
RJ45
0.1uF 0.1uF
1
2
3
4
5
6
7
8
Coilcraft
WBC1-TLB
PHY
Termination
Network
Check PHY
datasheet
3V3
TPB
6p8
TPB*
Keep Close to PHY!
1394b
PHY
(part)
Coilcraft
0603USB-222ML
Coilcraft
0603USB-222ML
GND
Coilcraft
0603USB-222ML
Coilcraft
WBC1-TLB
GND
0.1uF
SDOp
VCC
SDOn
SDIp
VCC
SDIn
LED
0.1uF
CLI
0.1uF
GND
0.1uF
0.1uF
PHY
Termination
Network
Check PHY
datasheet
TPA
TPA*
Keep Close to PHY!
0.1uF
GND
GND
GND
Light Emitting Diode
Remove Power planes below these components
GND
Figure 8: Example Schematic Implementation
To improve isolation from noise on the board power plane, it is recommended to power the equalizer
through a ferrite bead. A 0.1 μF decoupling capacitor should be placed as close as possible to each VCC
pin. Ground vias should be placed as close as possible to the device GND pins to minimize inductance.
To reduce electromagnetic emissions, it may be advised to place a 6.8pF capacitor in between TPB and
TPB* (transmit LVDS) of the PHY to reduce the rise/fall time of the transmitted signals. If fitted, the
capacitor should be placed as close as possible to the pins of the PHY.5
5
The toning process in Fire Wire applications cannot handle near end cross-talk very well: it can turn-on the receiver unwantedly, especially at
low temperatures, troubling the toning process. With the use of pairs 12 and 36 like in Fig. 8, temperatures below -10C are prone to this
difficulty, due to the crosstalk between the adjacent pins 2 and 3 of the UTP connector. When low temperature Fire Wire operation is needed,
it is advised to use pairs 12 and 78 instead. For other UTP applications that do not use toning, this is not an issue.
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5.2
PCB layout
Because signals are strongly attenuated by a long cable, special attention must be paid on the PCB layout
between the RJ45 connector and the EQCO400T. The EQCO400T8 should be as close as is practical to
the RJ45 connector. Traces between the RJ45, the transformer and the EQCO400T8 should be either
single-ended 50Ω traces, or preferably differential traces with a differential impedance of 100Ω. To
avoid noise pickup, these traces should be placed as far away as possible from other traces carrying
digital signals or fast switching signals. All differential traces should be matched in length to minimize
time of arrival skew.
For best EMC performance, identical common mode chokes should be used on the unused pairs to those
used on the signal pairs as shown in Figure 8. This ensures the impedance seen by all conductors in the
UTP cable is the same.
A reference design is available on request.
5.3
Recommended Magnetics
EqcoLogic recommends the following magnetics for use with their EQCO400T:
Component
Part Number
Transformers (1:1 with centre tap)
2 per channel
Coilcraft WBC1-1TLB
Common Mode Chokes
4 per channel
Coilcraft 1206USB-113MLB
Table 6: Recommended Magnetics
Operation with magnetics other than the recommended components cannot be guaranteed.
5.4
Connector pins and cable connection
The EQCO400T8 does not support auto-crossover. If required, this must be implemented external to the
device.
[1]
To be the same as 100BaseT Ethernet, IEEE Standard 1394-2008 recommends that data is transmitted
on RJ45 pins 1 and 2, and received on pins 3 and 6. If both sides of the long-haul UTP connection are
configured in this way, a crossover cable or patch cord must be used.
If one side of the UTP connection transmits data on RJ45 pins 1 and 2 and receives data on pins 3 and 6,
and the other side transmits data on RJ45 pins 3 and 6 and receives data on pins 1 and 2, a straightthrough cable must be used.
If maximum reach is the highest priority and if a closed system is created, it is recommended to use pins
1 and 2 for transmit (receive) and pins 7 and 8 for receive (transmit). This reduces near end crosstalk
(NEXT) significantly, which will give a bonus on the maximum cable span, especially for cat5e.
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5.5
Supplying Power over the UTP Cable
[2]
The EQCO400T8 is fully compatible with the Power Over Ethernet standard allowing standard POE
chipsets to be used at the ends of the cable to transmit power to a remote device. The unused pairs
(RJ45 pins 4,5 and 7,8) are most easily used for the transmission of power. The signal pairs can also be
used as specified in the standard, but in this case careful choice of magnetic components is required to
conform to both the DC requirements of POE and the AC requirements of IEEE-1394.
A POE reference design is available on request.
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6
Document Control
6.1
Version History
Version Date
Author
Comments
2.4
27 Febr 2014
M. Kuijk
2.3
2.2
2.1
03 May 2009
08 Dec 2008
02 Nov 2008
S.E. Ellwood
S.E. Ellwood
S.E. Ellwood
2.0
1.1
22 Jul 2008
02 Feb 2006
S.E. Ellwood
K. Van Den
Brande
Removed data about previous versions, added patent
information.
Added information on EQCO400T-8
Correction to Table 6
Added Table 6: Recommended Magnetics, changed
postal address
Released
New document
6.2
Document References
[1]
[2]
[3]
IEEE 1394-2008, Standard for High Performance Serial Bus
IEEE 802.3-2008, clause 33 – “Power over Ethernet” (formerly known as IEEE 802.3af)
Patents: US7564899B2, US7633354B2, EP1932305B1 & US7894515B2.
6.3
Ordering Information
6.4
Order Code
Application
EQCO400T.5
EQCO400T.7
EQCO400T8
Long-haul S100,S200,S400
S100, S200 cable extender
S100, S200,S400 cable extender
Package Type
Operating Range
16 Pin, 4mm QFN
16 Pin, 4mm QFN
16 Pin, 4mm QFN
0 C-70 C
o
o
0 C-70 C
o
o
0 C-70 C
o
o
Disclaimer:
EQCOLOCIC MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS
MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE. EqcoLogic reserves the right to make changes without further
notice to the materials described herein. EqcoLogic does not assume any liability arising out of the
application or use of any product or circuit described herein. EqcoLogic does not authorize its products
for use as critical components in life-support systems where a malfunction or failure may reasonably be
expected to result in significant injury to the user. The inclusion of EqcoLogic’s product in a life-support
systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies
Eqcologic against all charges.
CAUTION
ELECTROSTATIC
SENSITIVE
DEVICES
DS-EQCO400T-2V3
EqcoLogic NV
c/o ETRO/VUB dept.
Pleinlaan 2
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1050 Brussels
Phone: +32 2 629 1301
Email: phelfet@eqcologic.com
www:©2009
www.eqcologic.com
Eqcologic NV
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Engineering Information
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Appendix 1: Typical Operating Characteristics
Auto-adaptive
2m CAT6 cable before equalizer
after equalizer
Measured Jitter: ~ 0.2 UI
30m CAT6 cable before equaliser
after equaliser
Measured Jitter: ~ 0.2 UI
60m CAT6 cable before equaliser
after equaliser
Measured Jitter: ~ 0.2 UI
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90m CAT6 cable before equaliser
after equaliser
Measured Jitter: ~ 0.4 UI
CAT5e
The crosstalk generated in a CAT5e system is much higher than in a CAT6 system. This reduces the maximum cable
length over which a link can be maintained.
70m CAT5e
70m CAT5e - RX only
Measured Jitter: ~ 0.4 UI:
Crosstalk source: Tx on pair 1,2 ; S400β ; 630mV Tx ampl
Measured Jitter: ~ 0.2 UI
No crosstalk source
Variable gain
300mV Transmit amplitude (80m CAT6 cable)
800mV Transmit amplitude (80m CAT6 cable)
Measured Jitter: ~ 0.3 UI
No crosstalk source
Measured Jitter: ~ 0.2 UI
No crosstalk source
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Multi-speed
S200β, 110m CAT6 cable
S100β, 130m CAT6 cable
Measured Jitter: ~ 0.25 UI
Crosstalk source: Tx on pair 1,2 ; S200β ; 630mV Tx ampl
Measured Jitter: < 0.3 UI
Crosstalk source: Tx on pair 1,2 ; S100β ; 630mV Tx ampl
Notes:
Figures shown are for the EQCO400T.5 variant
9
All measurements at VCC = 3.3V, Temp = +25ºC, data pattern = 2 – 1 PRBS
Unless otherwise stated measurement parameters are as follows:
Receive signal on pair 3,6 ; S400β ; 630mV Transmit amplitude
Crosstalk source on pair 1,2 ; S400β ; 630mV Transmit amplitude
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EQCO400T8
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