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ML4668CQ

Low Power Single Chip 10BASE-FL Transceiver

Micro Linear Corporation 

March 1997

ML4668

Low Power Single Chip 10BASE-FL Transceiver

GENERAL DESCRIPTION

The ML4668 single-chip 10BASE-FL transceiver is a low

power, high output current, plug-compatible version of the

industry standard ML4663. The ML4668 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 ML4668 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 100mA maximum current drive output

that directly drives a fiber optic LED transmitter. The

receiver offers a highly stable fiber optic data quantizer

capable of accepting input signals as low as 2mVP-P with a

55dB dynamic 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.

BLOCK DIAGRAM

SQEN/JABD

5

Tx+ 10

Tx– 11

AUI

RECEIVER

Tx

SQUELCH

1MHz IDLE

SIGNAL

COL+ 2

COL– 3

AUI

DRIVER

Rx+ 6

Rx– 7

AUI

DRIVER

SQE

10MHz GATED

OSCILLATOR

Tx

LOOPBACK

MUX

Rx

19

GND

9

VCC

(+5V)

13

8

RRSET LBDIS

+5V

FEATURES

s Single chip solution for 10BASE-FL internal or external

Medium Attachment Units (MAUs)

s Incorporates an AU interface

s Highly stable data quantizer with 55dB input

dynamic range

s Input sensitivity as low as 2mVP-P

s Up to 100mA maximum current driven fiber optic LED

driver for accurate launch power

s Single +5 volt supply

s No crystal or clock required

s Five network status LED outputs

VCCTx

(+5V)

17

+5V

RTSET GND

12

20

AVCC

27

FIBER OPTIC

LED

DRIVER

JABBER

RECEIVE SQUELCH

18 TxOUT

LED

DRIVERS

BIAS

15 XMT

16 RCV

1 CLSN

28 JAB

14 LMON

AMP

CMP

∫

VREF

LINK DETECT

24

AGND

4

CTIMER

26 VIN+

25 VIN–

21 VDC

22 VREF

23 VTHADJ

1

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