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PDF EQCO400T8 Data sheet ( Hoja de datos )
| Número de pieza | EQCO400T8 | |
| Descripción | UTP Cable Equalizer | |
| Fabricantes | Microchip | |
| Logotipo |  |
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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
Bit Rate
(8B/10B Coding)
1394 Data Rate
Cat 5e
Range(2) using
Cat 6
EQCO400T8
125 Mbps
S100
0m-85m
0m-85m
250 Mbps
S200
0m-75m
0m-85m
500 Mbps
S400
0m-50m
0m-75m
Note 1: IEEE 802.3-2008, clause 33 - "Power over Ethernet" (formerly known as IEEE 802.3af)
2: 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
1 page  
EQCO400T8
FIGURE 1-3:
EQCO400T8 BLOCK DIAGRAM SHOWING ELECTRICAL CONNECTIONS
EQCO400T
Carrier Detect
/Mute
SDIp
SDIn
Equalizer
Core
Output Driver
LED
SDOp
SDOn
CLI
1.1 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 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.
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.
1.3 CLI
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.
2006-2016 Microchip Technology Inc.
DS60001310B-page 5
5 Page 
EQCO400T8
3.0 ELECTRICAL CHARACTERISTICS
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.
TABLE 3-1:
ABSOLUTE MAXIMUM RATINGS
Parameter
Min.
Storage Temperature
Ambient Temperature
Operating Temperature
-65
-55
-40
Typ.
—
—
—
Supply Voltage to Ground
DC Input Voltage
DC Voltage to Outputs
Current into Outputs
-0.5 —
-0.5 —
-0.5 —
——
Max.
+150
+125
+85
+4.0
+4.0
+4.0
90
Units
°C
°C
°C
V
V
V
mA
Conditions
Power Applied
Normal Operation
(VCC = 3.3V ±5%)
Outputs Low
TABLE 3-2: MAXIMUM CURRENT CONSUMPTION AT 3.3V
Description
Max
No input signal, LED is low, output driver is disabled
Valid input, LED is high, output driver is enabled
4.25
42.5
Unit
mA
mA
TABLE 3-3:
ELECTRICAL CHARACTERISTICS (OVER THE OPERATING VCC AND -40°C TO
+85°C RANGE)
Parameter
Min.
Typ.
Max. Unit
Description
Power Supply
VCC
3.135 3.3 3.465 V
100 500 600 Mbps Signaling rate (NRZ, 8b/10b encoded)
SDIp/SDIn Input
Differential Input Voltage
475
—
800 mV VSDIp-VSDIn measured at cable input
Swing
LVDSImin
— 40 — mV Minimum differential input for fully
reconstructed output
— 3.3 — V Common-mode input voltage
Rinput
— 50 — Ω Single-ended; to VCC
2006-2016 Microchip Technology Inc.
DS60001310B-page 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet EQCO400T8.PDF ] | |
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