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PDF ISL36111 Data sheet ( Hoja de datos )
| Número de pieza | ISL36111 | |
| Descripción | 11.1Gb/s Lane Extender | |
| Fabricantes | Intersil | |
| Logotipo |  |
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11.1Gb/s Lane Extender
ISL36111
The ISL36111 is a settable single-channel receive-side
equalizer with extended functionality for advanced protocols
operating with line rates up to 11.1Gb/s, such as 10G
Ethernet. The ISL36111 compensates for the frequency
dependent attenuation of copper twin-axial cables, extending
the signal reach up to at least 10m on 28AWG cable.
The small form factor, highly-integrated design is ideal for
high-density data transmission applications including active
copper cable assemblies. The equalizing filter within the
ISL36111 can be set to provide optimal signal fidelity for a
given media and length. The compensation level for the filter is
set by two external control pins.
Operating on a single 1.2V power supply, the ISL36111
enables channel throughputs of 10Gb/s to 11.1Gb/s while
supporting lower data rates including 8.5, 6.25, 5, 4.25, 3.125,
2.5 and 1 Gb/s. The ISL36111 uses current mode logic (CML)
input/output and is packaged in a 3mmx3mm 16 lead QFN.
The device supports LOS functionality for module applications.
Features
• Supports data rates up to 11.1Gb/s
• Low power (~110mW)
• Low latency (<500ps)
• Single channel equalizer in a 3mmx3mm QFN package for
straight route-through architecture and simplified routing
• Adjustable equalizer boost
• Supports 64b/66b encoded data – long run lengths
• Line silence preservation
• 1.2V supply voltage
• Loss of Signal support
Applications
• SFP+ active copper cable modules
• QSFP active copper cable modules
• 10G Ethernet
• Fibre Channel
• High-speed active cable assemblies
• High-speed printed circuit board (PCB) traces
Benefits
• Thinner gauge cable
• Extends cable reach greater than 3x
• Improved BER
1.2V
0.1mF
0.1mF
LOS CP-A CP-B Vdd
OUT [P]
IN [P]
IQSLLx316111V1R1x
OUT [N]
IN [N]
0.1mF
0.1mF
GND DT
1.2V
LOS
Vdd
0.1mF
DE-A DE-B
IN [P]
OUT [P]
0.1mF IQSLLx315111V1T1x
IN [N]
OUT [N]
TDSBL GND DT
July 19, 2012
FN6974.2
FIGURE 1. TYPICAL CABLE APPLICATION DIAGRAM
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2009, 2010, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL36111
IN[P]
IN[N]
Adjustable
Equalizer
Limiting
Amplifier
Output
Driver
OUT[P]
OUT[N]
DT
Signal
Detector
LOSB
FIGURE 4. FUNCTIONAL BLOCK DIAGRAM OF THE ISL36111
Operation
The ISL36111 is an advanced lane-extender for high-speed
interconnects. A functional diagram of ISL36111 is shown in
Figure 4. In addition to a robust equalization filter to compensate
for channel loss and restore signal fidelity, the ISL36111
contains unique integrated features to preserve special signaling
protocols typically broken by other equalizers. The signal detect
function is used to mute the channel output when the input
signal falls below the level determined by the Detection
Threshold (DT) pin voltage. This function is intended to preserve
periods of line silence (“DC idle”). Furthermore, the output of the
Signal Detect/DT comparator is used as a loss of signal (LOSB)
indicator to indicate the absence of a received signal.
As illustrated in Figure 4, the core of the high-speed signal path
in the ISL36111 is a sophisticated equalizer followed by a
limiting amplifier. The equalizer compensates for skin loss,
dielectric loss, and impedance discontinuities in the
transmission channel. The equalizer is followed by a limiting
amplification stage that provides a clean output signal with full
amplitude swing and fast rise-fall times for reliable signal
decoding in a subsequent receiver.
Adjustable Equalization Boost
ISL36111 features a settable equalizer for custom signal
restoration. The flexibility of this adjustable compensation
architecture enables signal fidelity to be optimized based on a
given application, providing support for a wide variety of channel
characteristics and data rates ranging from 2.5Gb/s to
11.1Gb/s. Because the boost level is externally set rather than
internally adapted, the ISL36111 provides reliable
communication from the very first bit transmitted. There is no
time needed for adaptation and control loop convergence.
Furthermore, there are no pathological data patterns that will
cause the ISL36111 to move to an incorrect boost level.
Control Pin Boost Setting
The connectivity of the CP pins are used to determine the boost
level of ISL36111. Table 1 defines the mapping from the 2-bit CP
word to the 9 available boost levels.
TABLE 1. MAPPING BETWEEN BOOST LEVEL AND CP-PIN
CONNECTIVITY
CPA CPB
BOOST LEVEL
Float
Float
0
Float
GND
1
GND VDD
2
Float
VDD
3
VDD Float
4
GND Float
5
GND GND
6
VDD GND
7
VDD VDD
8
CML Input and Output Buffers
The input and output buffers for the high-speed data channel in
the ISL36111 are implemented using CML. Equivalent input and
output circuits are shown in Figures 5 and 6.
VDD
IN[P]
50OΩ
IN[N]
50OΩ
1st Filter
Stage
FIGURE 5. CML INPUT EQUIVALENT CIRCUIT FOR THE ISL36111
5 FN6974.2
July 19, 2012
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ISL36111.PDF ] | |
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