Micro Linear ML6651, Руководство пользователя

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The ML6651 Evaluation Board demonstrates the
capabilities of the ML6651. The eval-board’s block diagram
is shown in Figure 1. This integrated circuit is a Media
Converter between twisted pair and fiber optic Ethernet
technologies. It supports conversion between 10BASE-T
and 10BASE-FL, between 100BASE-TX and 100BASE-FX/SX
and, between FLP Bursts and FLNP Bursts. (FLP: Fast Link
Pulse, FLNP: Fiber Link Negotiation Pulse.) One or both of
the fiber optic or twisted pair interfaces can be configured
to interface with industry standard 1x9 fiber optic PMD
modules, (using the PECL compatible modes) or minature
fiber optic comonents (typically called “sugar-cubes”) as it
supports both 850nm and 1300nm optics.
Three of the many possible configurations of the ML6651
eval boards are offered:
1) 10/100Mbs copper to 850/1300nm fiber optic “sugar
cubes”. This configuration has two board sizes: full
(rev. B), and mini (rev. E). See attached schematic
(Appendix D) labeled “ML6651 EVAL BOARD
SCHEMATIC (sugar cubes on right)”. The reduced or
mini size has layout and options restricted. But, it
comes with an AC-DC adapter since it has a 5V-to-
3.3V regulator on board. In contrast, the full size
version re5 and +3.3VDC supplies.
2) 10/100Mbs copper to 1300nm, 1X9 PECL module. See
attached schematic (Appendix B) labeled “ML6651
EVAL BOARD SCHEMATIC (9 pin module on right),
rev- A “. This full size board re5 and +3.3VDC
supplies and includes options for user defined
configuration purposes.
3) 10/100Mbs copper to 1300nm, MT-RJ, PECL module.
See attached schematic (Appendix C) labeled
“ML6651 EVAL BOARD SCHEMATIC (MT-RJ on right),
rev-CMT”. Board re5 and +3.3VDC supplies,
full size only. This board is actually contructed by
using rev. A 1x9 PECL board above with different PCB
stuffing requirements. A daughter card is installed in
place of the 1X9 module. The daughter card carries the
MTRJ module and appropriate by-pass capacitors. The
schematic has reflected all the necessary changes:
OVERVIEW
ML6651
10/100Mbps Fiber and Copper Ethernet
Media Converter User’s Guide
FEATURES
• Compatible with new TIA/EIA-785 10/100BASE-SX
standard. It is also intended to support ISO/IEC 8802.3
and IEEE 802.3 standards.
• Automatic detection and configuration of link for 10 or
100 Mbps operation using Auto-Negotiation protocol
(Transparent Mode)
• Supports Parallel Detection for speed configuration in
absence of FLP Bursts (Forced Mode)
• Supports SPEED and DUPLEX mode configuration in
absence of auto negotiation capability on fiber side
• Offers bandwidth migration from 10 Mbps to 100 Mbps
over fiber and copper networks
• Supports both miniature “sugar-cube” fiber-optic
components and PMD transceivers such as 1x9 (5V) or
MT-RJ (3.3V) PECL modules
• Multiple modes of operation for all network
configurations, especially Transparent Mode (see
ML6651 datasheet for more details)
• Transmission distance from 300 meters of multimode
fiber-optic cable up to 2 kilometers of singlemode fiber
optic cable
• Use 1:1 transformer ratio for TP’s transmit and receive
paths without requiring external filtering
• Integrated 100BASE-TX equalizer and baseline wander
correction circuits
• Integrated fiber optic receive quantizer
• Control logic for power-down, TP’s transmitter off, and
fiber optic transmitter off
• Single chip, low power, small footprint SMT
components: small PCB board
e p y T e b u C r a g u S L C E P 9 X 1 J R T M
e z i S / v e R
l l u F / B
i n i M / E
l l u F / A
i n i M / *
l l u F / T M C
November 2001 User’s Guide