March 1997
ML4665
Low Cost Single Chip 10BASE-FL Transceiver
GENERAL DESCRIPTION
The ML4665 is a low power, low cost, single chip
10BASE-FL transceiver. The ML4665 contains a fiber optic
data quantizer and an LED output driver for direct
connection to an optical module(s). The ML4665 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 ML4665 provides a highly integrated solution that
requires a minimal number of external components. 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 2mV
P-P
with
a 55dB dynamic range.
The ML4665 is a lower cost version of the industry
standard ML4663. To achieve lower cost, the ML4665
eliminates some functionality (as described below) and is
packaged in a 20-lead PLCC package.
FEATURES
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Lower cost single chip solution for 10BASE-FL internal
or external Medium Attachment Units (MAUs)
Incorporates an AU interface
Highly stable data quantizer with 55dB input
dynamic range
Input sensitivity as low as 2mV
P-P
100mA maximum current driven fiber optic LED driver
for accurate launch power
Single +5 volt supply
No crystal or clock required
Link monitor LED indicator
BLOCK DIAGRAM
Tx+
7
Tx–
8
V
CC
Tx
(+5V)
12
+5V
RTSET
9
AV
CC
20
AUI
RECEIVER
FIBER OPTIC
LED
DRIVER
13
TxOUT
Tx
SQUELCH
1MHz IDLE
SIGNAL
JABBER
11
LMON
COL
RECEIVE SQUELCH
COL+
2
COL–
3
AUI
DRIVER
10MHz GATED
OSCILLATOR
AMP
Tx
Rx+
4
Rx–
5
AUI
DRIVER
LOOPBACK
MUX
Rx
CMP
BIAS
19
V
IN
+
18
V
IN
-
∫
V
REF
LINK DETECT
14
6
10
1
17
15
16
V
DC
GND
V
CC
(+5V)
RRSET LBDIS
+5V
AGND
C
TIMER
1
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
