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January 1997

ML6680

Token Ring Copper-to-Fiber Converter

GENERAL DESCRIPTION

The ML6680 is a single-chip conversion between Token

Ring ISO/IEC8802-5 copper-based media and Token Ring

ISO/IEC8802-5 fiber-based media. The ML6680 fiber-optic

interface contains a data quantizer, circuitry for fiber optic

key signal generation and recognition, pin-selectable

signal switching, and current driven transmitter outputs.

The ML6680 copper interface consists of a twisted pair

line equalizer, receive squelch circuit, pin selectable

phantom wire fault detection and signal switching, and a

transmit driver. This section supports the ISO/IEC8802-5

standard requirements. The ML6680 provides an optional

PECL compatible interface.

The ML6680 may be configured to one of four modes:

1.

2.

3.

4.

Standard Media Converter

Concentrator Media Converter

Lobe or Ring Out Port Media Converter

Ring In Port Media Converter

FEATURES

s

s

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Single-chip copper-to-fiber converter for Token Ring

16Mbps and 4Mbps data rates with the same

external components

Four modes of operation covering a wide variety

of applications

Full duplex operation

Highly stable data quantizer with 55dB input

dynamic range

Current driven fiber optic LED driver for accurate

launch power

Current driven output for low RFI noise and low jitter

Capable of driving 100鈩?UTP or 150鈩?STP

Pin selectable phantom wire fault detection and

signal switching

BLOCK DIAGRAM

EQA

TPINP

TPINN

TWISTED PAIR

EQUALIZER

LED

DRIVER

EQB

RTSETOP

OPVCC

OPOUT

TPINOK

TWISTED PAIR

RECEIVE SQUELCH

SIGNAL

MUX

FIBER OPTIC

RECEIVE SQUELCH

OPINOK

RTSETTP

TPOUTP

TPOUTN

TWISTED PAIR

DRIVER

FIBER OPTIC

QUANTIZER

OPINP

OPINN

VDC

PHTM1

PHTM2

PHANTOM

DRIVER

CONTROL

LOGIC

BIAS

XTAL1

CRYSTAL

OSCILLATOR

XTAL2

KEYGEN

INSERTED

1

next

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