March 1997

ML4663

Single Chip 10BASE-FL Transceiver

GENERAL DESCRIPTION

The ML4663 single-chip 10BASE-FL transceiver integrates

both a ML4662 10BASE-FL transceiver with a ML4622

fiber optic data quantizer to implement a highly integrated

solution for 10BASE-FL transceivers. The ML4663 offers a

standard IEEE 802.3 AU interface that allows it to be

directly connected to industry standard manchester

encoder/decoder chips or an AUI connector.

The ML4663 provides a highly integrated solution that

requires a minimal number of external components, and is

compliant to the IEEE 802.3 10BASE-FL standard. The

transmitter offers a current drive output that directly drives

a fiber optic LED transmitter. The receiver offers a highly

stable fiber optic data quantizer capable of accepting

range.

The transmitter automatically inserts 1MHz signal during

idle time and removes this signal on reception. Low Light

is continuously monitored for both activity as well as

power level. Five LED status indicators monitor error

conditions as well as transmissions, receptions and

collisions.

FEATURES

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Single chip solution for 10BASE-FL internal or external

Medium Attachment Units (MAUs)

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Incorporates an AU interface

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Highly stable data quantizer with 55dB input

dynamic range

s

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Current driven fiber optic LED driver for accurate

launch power

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Single +5 volt supply

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No crystal or clock required

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Five network status LED outputs

AUI

RECEIVER

Tx

SQUELCH

AUI

DRIVER

AUI

DRIVER

10MHz GATED

OSCILLATOR

LOOPBACK

MUX

JABBER

RECEIVE SQUELCH

LINK DETECT

LED

DRIVERS

FIBER OPTIC

LED

DRIVER

1MHz IDLE

SIGNAL

SQE

GND

(+5V)

+5V

LBDIS

AGND

RRSET

Tx

Rx

BIAS

GND

(+5V)

+5V

RTSET

SQEN/JABD

Tx+

Tx–

COL+

COL–

Rx+

Rx–

TxOUT

XMT

RCV

CLSN

JAB

LMON

∫

CMP

AMP

5

17

12

20

27

18

15

16

1

28

14

26

25

21

22

23

4

24

8

13

9

19

7

6

3

2

11

10

BLOCK DIAGRAM

1

Please

See ML4668

for New

Designs