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| ML4668 Datasheet, PDF (1/14 Pages) Micro Linear Corporation – Low Power Single Chip 10BASE-FL Transceiver | |||
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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
Txâ 11
AUI
RECEIVER
Tx
SQUELCH
1MHz IDLE
SIGNAL
COL+ 2
COLâ 3
AUI
DRIVER
Rx+ 6
Rxâ 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
â«
VREF
LINK DETECT
24
AGND
4
CTIMER
26 VIN+
25 VINâ
21 VDC
22 VREF
23 VTHADJ
1
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