July 2000
ML4664
*
/ML4669
*
10BASE-FL to 10BASE-T Converter
GENERAL DESCRIPTION
The fully pin-compatible ML4664/ML4669 pair provide
conversion from 10BASE-T copper media to 10BASE-FL
fiber media in a single chip. They are compliant with
Ethernet IEEE 802.3 10BASE-T and 10BASE-FL standards.
The ML4664/69 uses a single 5V supply, and requires no
crystal or clock.
Their 10BASE-FL transmitter offers a current drive output
that directly drives a fiber optic LED transmitter. Their
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 10BASE-T portion of the pair contains current driven
transmitter outputs that offer superior performance
because their switching is highly symmetric, resulting in
lowered RFI noise and jitter. By changing one external
resistor the pair easily interfaces to 100
W unshielded
twisted pair, 150
W shielded twisted pair, or a range of
other characteristic impedances.
The ML4664 does not pass along disconnect information,
while the ML4669 does. A loss of light at the optical
inputs does not stop link pulses from being sent at the
twisted pair transmitter in the ML4664, but in the
ML4669 the link pulses stop. Also, a loss of link at the
twisted pair inputs will not stop the optical transmitter
from sending idle in the ML4664, but the ML4669 stops
sending idle.
* Some Packages Are Obsolete
FEATURES
s
Full duplex operation
s
Five network status LED outputs
s
Industrial temperature option
10BASE-FL FEATURES:
s
Highly stable data quantizer with 55dB input dynamic
range
s
Input sensitivity as low as 2mV
P-P
s
Up to 100mA maximum current driven fiber optic LED
output for accurate launch power (PLCC package)
10BASE-T FEATURES:
s
Current driven output for low RFI noise and low jitter
s
Drives 100
W unshielded or 150W shielded twisted pair
s
Polarity detect status pin capable of driving an LED
s
Automatic polarity correction
s
On-chip link test with enable/disable option
1
BLOCK DIAGRAM
LINK PULSE
CHECK
RX SQUELCH
TP
POLARITY
CORRECT
LINK PULSE
GENERATOR
TP
TX
RX SQUELCH
TP
THRESHOLD
GENERATOR
QUANTIZER
OP
TX
TPOUT
2
2
TPIN
2
RTSETTP
TxCAP0
TxCAP1
LMON
(LOW LIGHT)
VDC
CTIMER
OPIN
OPOUT
OPVCC
RTSETOP
RRSET
POLDIS
LTF
TPLED
OPLED
IDLE
GENERATOR
2
ML4664/ML4669
PIN CONFIGURATION
TOP VIEW
ML4664/ML4669
28-Pin PLCC (Q28)
OPINN
AGND
VTHADJ
VREF
VDC
GND
OPOUT
5
6
7
8
9
10
11
25
24
23
22
21
20
19
4
3
2
1 28 27 26
12 13 14 15 16 17 18
POLDIS
RTSETP
V
CC
RRSET
RTSETOP
LMON
OPVCC
TPINN
VCC
TxCAP0
TxCAP1
GND
TPOUTN
TPOUTP
TPINP
TPLED
LTF
C
TIMER
OPLED
AV
CC
OPINP
OPINN
AGND
VTHADJ
VREF
VDC
NC
GND
OPOUT
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
32 31 30 29 28 27 26 25
24
23
22
21
20
19
18
17
TPINN
NC
VCC
TxCAP0
TxCAP1
GND
TPOUTN
TPOUTP
NC
POLDIS
RTSETP
V
CC
RRSET
RTSETOP
LMON
OPVCC
TPINP
TPLED
LTF
C
TIMER
OPLED
NC
AV
CC
OPINP
TOP VIEW
ML4664/ML4669
32-Pin TQFP (H32-7)
3
ML4664/ML4669
PIN
NAME
FUNCTION
1(29)
C
TIMER
A capacitor from this pin to V
CC
determines the Link Monitor response
time.
2(30)
LTF
Link Test Fail. Active high. Normally
this pin is low, indicating that the link
is operational. If the link goes down
resulting from the absence of link
pulses or frames being received, the
chip will go into the Link Test Fail
state and bring LTF high.
When the ML4664 is in the link test
fail state, the optical and twisted pair
transmitters are disabled from sending
data. However, the optical transmitter
does send an idle signal, and link
pulses are sent at the twisted pair
transmitter. When the ML4669 is in
link test fail state, the optical and
twisted pair transmitters are disabled
from sending data. Also, the optical
transmitter will not send an idle
signal. However, link pulses may be
sent at the twisted pair transmitter,
depending on the optical inputs. See
Table 1.
This pin may be grounded to disable
Link Test. In this mode no link pulses
are sent and the link will not fail if no
link pulses are received. If this pin is
not used as an LED driver, and is not
grounded, a 2k
W 5% resistor should
be connected between this pin and
V
CC
.
3(31)
TPLED
Indicates that reception is taking place
on the TPINP, TPINN pair. Active low
LED driver, open collector. It is
extended 16ms for visibility.
Optionally, this pin may be grounded
to disable the optical output. If this
pin is not used as an LED driver and is
not grounded, a 2k
W, 5% resistor
should be connected between TPLED
and V
CC
.
4(32)
TPINP
Twisted Pair receive data input.
5(1)
TPINN
When this signal exceeds the
receive squelch requirements the
receive data is buffered and sent
to the Rx outputs.
6(3)
V
CC
5V input
14(12)
PIN DESCRIPTION
(Pin Number in Parentheses is for TQFP Version)
PIN
NAME
FUNCTION
7(4)
TxCAP0
An external capacitor of 680pF is
8(5)
TxCAP1
tied between these two pins to set
the pulse width for the pre-
equalization on the twisted pair
transmitter. If these two pins are
shorted together, no pre- equalization
occurs. If the ML4664/ML4669 is
driving only a short cable, or board
traces, these pins may be shorted.
9(6)
GND
Ground reference
20(18)
10(7)
TPOUTN Pre-equalized differential balanced
11(8)
TPOUTP current driven output. These outputs
are connected to a balanced transmit
output filter which drives the twisted
pair cable through pulse transformers.
The output current is set with an
external resistor connected to RTSET
allowing the chip to drive 100
W
unshielded , 150
W shielded twisted
pair cables or a range of other
characteristic impedances.
12(10) POLDIS
Receive Polarity status. Active low
LED Driver, open collector output.
Indicates the polarity of the receive
twisted pair regardless of auto polarity
correction. When low, receive polarity
is reversed. When high, receive
polarity is correct. This pin may be
grounded to disable the polarity
circuit. If this pin is not used as an
LED driver, and is not grounded, a
2k
W, 5% resistor should be connected
between this pin and V
CC
.
13(11) RTSETTP When using 100
W unshielded twisted
pair, a 220
W resistor is tied between
this pin and V
CC
. When using 150
W
shielded twisted pair, a 330
W resistor
is tied between this pin and V
CC
.
15(13) RRSET
A 1% 61.9k
W resistor tied from this
pin to V
CC
is used for internal biasing.
16(14) RTSETOP Sets the current driven output of the
transmitter. A 115
W resistor should be
tied between this pin and V
CC
.
4
ML4664/ML4669
PIN
NAME
FUNCTION
22(21) V
REF
A 2.5V reference with respect to GND
23(22) V
THADJ
This input pin sets the link monitor
threshold
24(23) AGND
Analog Filtered Ground
25(24) OPINN
This input pin should be capacitively
coupled to filtered AV
CC
. The input
resistance is approximately 1.3k
W.
26(25) OPINP
This input pin should be capacitively
coupled to the input source. The input
resistance is approximately 1.3k
W.
27(26) AV
CC
Analog Filtered 5V
28(28) OPLED
Indicates reception is taking place on
the OPINP, OPINN pair. Active low
LED driver, open collector. It is
extended 16ms for usability. This pin
may be grounded to disable the
twisted pair outputs. If this pin is not
used as an LED driver, and is not
grounded, a 2k
W, 5% resistor should
be connected between this pin and
V
CC
.
PIN
NAME
FUNCTION
17(15) LMON
Link Monitor "Low Light" LED status
output. Pulled low when voltage on
the OPINP, OPINN inputs exceed min
threshold set by V
THADJ
, and there are
transitions on OPINP, OPINN
indicating an idle signal or active
data. If the voltage on OPINP, OPINN
inputs falls below the minimum
threshold or transitions cease on
OPINP, OPINN, LMON will go high.
Active low LED driver, open collector.
In the low light state, optical and
twisted pair transmitters are disabled
from sending data. The optical
transmitter of the ML4664 does send
an idle signal, and link pulses are sent
at the twisted pair transmitter. For the
ML4669, the twisted pair transmitter
will not send link pulses, the optical
transmitter may send an idle signal,
depending on inputs. See Table 1.
18(16) OPVCC
5V supply for fiber optic
LED driver
19(17) OPOUT
Fiber optic LED driver output
21(20) V
DC
An external capacitor on this pin
integrates an error signal which nulls
the offset of the input amplifier. If the
DC feedback loop is not being used,
this pin should be connected to V
REF
.
PIN DESCRIPTION
(Continued)
5
ML4664/ML4669
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond
which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and
functional device operation is not implied.
Power Supply Voltage Range
V
CC ...................................................................
GND 0.3 to 6V
Input Voltage Range: Digital Inputs
(SQEN, LBDIS) ....................... GND 0.3 to V
CC
+0.3V
Tx+, Tx, V
IN
+, V
IN
.............. GND 0.3 to V
CC
+0.3V
Junction Temperature ............................................. 150C
Storage Temperature ................................ 65C to 150C
Lead Temperature (Soldering) ................................ 260C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, T
A
= Operating Temperature Range, V
CC
= OPV
CC
= AV
CC
= 5V 5% (Note 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
CC
Power Supply Current
RTSETOP = 115
W
140
mA
While Transmitting
V
REF
Reference Voltage
C Suffix
2.30
2.60
V
I Suffix
2.25
2.67
V
V
OL
LED Drivers: V
OL
R
L
= 300 for OPLED, TPLED,
1.5
3.5
V
POLLED LTF, and LMON
I
OPOUT
OP Transmit Peak Output Current
RTSETOP = 115 (Note 2) C Suffix
47
52
57
mA
I Suffix
46
58.5
mA
I
TPOUT
TP Transmit Peak Output Current
RTSETTP = 220
42
mA
V
TPSQ
TP Receive Squelch Voltage
300
450
585
mV
P-P
H
TP
TP Receive Squelch Hysteresis
50
%
V
TPIN
TP Receive Input Voltage
300
3100
mV
P-P
R
TPIN
TP Receive Input Resistance
4
k
W
V
OPTH
OP Receive Input Threshold
V
THADJ
= V
REF
5
6
7
mV
P-P
Voltage
H
OP
OP Receive Input Threshold
20
%
Hysteresis
V
OPIN
OP Receive Input Voltage
2
1600
mV
P-P
R
OPIN
OP Receive Input Resistance
0.8
1.3
2.0
k
W
V
OPCM
OP Receive Common Mode
1.65
V
Voltage
A
V
Amplifier Gain
100
V/V
V
OFF
Input Offset
V
DC
= V
REF
(DC Loop Inactive)
3
mV
V
N
Input Referred Noise
50MHz Bandwidth
25
V
I
TH
Input Bias Current at V
THADJ
V
THADJ
= V
REF
200
0
200
A
Thermal Resistance (
q
JA
)
PLCC ............................................................... 68C/W
TQFP ............................................................... 80C/W
OPERATING CONDITIONS
Temperature Range
ML4664/ML4669CX .................................. 0C to 70C
ML4664/ML4669IQ ............................... 40C to 85C
Supply Voltage (V
CC
) ......................................... 5V 5%
LED on Current ...................................................... 10mA
RRSET ........................................................ 61.9k
W 1%
RTSETOP ....................................................... 115
W 1%
RTSETTP ........................................................ 220
W 1%
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