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 100W unshielded
twisted pair, 150W 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.
FEATURES
s
s
s
Full duplex operation
Five network status LED outputs
Industrial temperature option
10BASE-FL FEATURES:
s
Highly stable data quantizer with 55dB input dynamic
range
Input sensitivity as low as 2mV
P-P
Up to 100mA maximum current driven fiber optic LED
output for accurate launch power (PLCC package)
s
s
10BASE-T FEATURES:
s
s
s
s
s
Current driven output for low RFI noise and low jitter
Drives 100W unshielded or 150W shielded twisted pair
Polarity detect status pin capable of driving an LED
Automatic polarity correction
On-chip link test with enable/disable option
* Some Packages Are Obsolete
BLOCK DIAGRAM
LTF
LINK PULSE
CHECK
TPLED
POLDIS
IDLE
GENERATOR
RRSET
RTSETOP
TPIN
2
RX SQUELCH
TP
OP
TX
OPOUT
OPVCC
POLARITY
CORRECT
LINK PULSE
GENERATOR
RX SQUELCH
TP
TPOUT
2
RTSETTP
TP
TX
TxCAP0
TxCAP1
LMON
(LOW LIGHT)
THRESHOLD
GENERATOR
QUANTIZER
OPLED
VDC
CTIMER
2
OPIN
1
ML4664/ML4669
PIN CONFIGURATION
ML4664/ML4669
28-Pin PLCC (Q28)
CTIMER
OPLED
AVCC
OPINP
TPLED
3
TPINP
4
TPINN
VCC
TxCAP0
TxCAP1
GND
TPOUTN
TPOUTP
5
6
7
8
9
10
11
LTF
2
1 28 27 26
25
24
23
22
21
20
19
OPINN
AGND
VTHADJ
VREF
VDC
GND
OPOUT
12 13 14 15 16 17 18
VCC
RRSET
LMON
POLDIS
TOP VIEW
ML4664/ML4669
32-Pin TQFP (H32-7)
CTIMER
OPLED
OPINP
TPLED
TPINP
AVCC
LTF
NC
TPINN
NC
VCC
TxCAP0
TxCAP1
GND
TPOUTN
TPOUTP
32 31 30 29 28 27 26 25
24
1
2
3
4
5
6
7
8
9
23
22
21
20
19
18
17
10 11 12 13 14 15 16
RTSETOP
OPVCC
RTSETP
OPINN
AGND
VTHADJ
VREF
VDC
NC
GND
OPOUT
NC
POLDIS
VCC
RTSETP
RTSETOP
LMON
RRSET
TOP VIEW
2
OPVCC
ML4664/ML4669
PIN DESCRIPTION
(Pin Number in Parentheses is for TQFP Version)
PIN
NAME
FUNCTION
PIN
NAME
FUNCTION
1(29)
C
TIMER
A capacitor from this pin to V
CC
determines the Link Monitor response
time.
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 2kW 5% resistor should
be connected between this pin and
V
CC
.
7(4)
8(5)
TxCAP0
TxCAP1
2(30)
LTF
An external capacitor of 680pF is
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.
Ground reference
9(6)
GND
20(18)
10(7)
11(8)
TPOUTN Pre-equalized differential balanced
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 100W
unshielded , 150W shielded twisted
pair cables or a range of other
characteristic impedances.
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
2kW, 5% resistor should be connected
between this pin and V
CC
.
12(10) POLDIS
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 2kW, 5% resistor
should be connected between TPLED
and V
CC
.
Twisted Pair receive data input.
When this signal exceeds the
receive squelch requirements the
receive data is buffered and sent
to the Rx± outputs.
5V input
13(11) RTSETTP When using 100W unshielded twisted
pair, a 220W resistor is tied between
this pin and V
CC
. When using 150W
shielded twisted pair, a 330W resistor
is tied between this pin and V
CC
.
15(13) RRSET
A 1% 61.9kW resistor tied from this
pin to V
CC
is used for internal biasing.
4(32)
5(1)
TPINP
TPINN
16(14) RTSETOP Sets the current driven output of the
transmitter. A 115W resistor should be
tied between this pin and V
CC
.
6(3)
V
CC
14(12)
3
ML4664/ML4669
PIN DESCRIPTION
(Continued)
PIN
NAME
FUNCTION
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.
22(21) V
REF
23(22) V
THADJ
24(23) AGND
25(24) OPINN
A 2.5V reference with respect to GND
This input pin sets the link monitor
threshold
Analog Filtered Ground
This input pin should be capacitively
coupled to filtered AV
CC
. The input
resistance is approximately 1.3kW.
This input pin should be capacitively
coupled to the input source. The input
resistance is approximately 1.3kW.
Analog Filtered 5V
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 2kW, 5% resistor should
be connected between this pin and
V
CC
.
26(25) OPINP
27(26) AV
CC
28(28) OPLED
18(16) OPVCC
19(17) OPOUT
21(20) V
DC
5V supply for fiber optic
LED driver
Fiber optic LED driver output
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
.
4
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 ............................................. 150°C
Storage Temperature ................................ –65°C to 150°C
Lead Temperature (Soldering) ................................ 260°C
Thermal Resistance (q
JA
)
PLCC ............................................................... 68°C/W
TQFP ............................................................... 80ºC/W
OPERATING CONDITIONS
Temperature Range
ML4664/ML4669CX .................................. 0°C to 70°C
ML4664/ML4669IQ ............................... –40°C to 85°C
Supply Voltage (V
CC
) ......................................... 5V ± 5%
LED on Current ...................................................... 10mA
RRSET ........................................................ 61.9kW ± 1%
RTSETOP ....................................................... 115W ± 1%
RTSETTP ........................................................ 220W ± 1%
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, T
A
= Operating Temperature Range, V
CC
= OPV
CC
= AV
CC
= 5V ± 5% (Note 1)
SYMBOL
I
CC
V
REF
PARAMETER
Power Supply Current
While Transmitting
Reference Voltage
CONDITIONS
RTSETOP = 115W
C Suffix
I Suffix
MIN
TYP
MAX
140
UNITS
mA
V
V
V
mA
mA
mA
2.30
2.25
1.5
47
46
42
300
450
50
300
4
52
2.60
2.67
3.5
57
58.5
V
OL
I
OPOUT
LED Drivers: V
OL
OP Transmit Peak Output Current
R
L
= 300 for OPLED, TPLED,
POLLED LTF, and LMON
RTSETOP = 115 (Note 2) C Suffix
I Suffix
I
TPOUT
V
TPSQ
H
TP
V
TPIN
R
TPIN
V
OPTH
H
OP
V
OPIN
R
OPIN
V
OPCM
A
V
V
OFF
V
N
I
TH
TP Transmit Peak Output Current
TP Receive Squelch Voltage
TP Receive Squelch Hysteresis
TP Receive Input Voltage
TP Receive Input Resistance
OP Receive Input Threshold
Voltage
OP Receive Input Threshold
Hysteresis
OP Receive Input Voltage
OP Receive Input Resistance
OP Receive Common Mode
Voltage
Amplifier Gain
Input Offset
Input Referred Noise
Input Bias Current at V
THADJ
RTSETTP = 220
585
mV
P-P
%
3100
mV
P-P
kW
V
THADJ
= V
REF
5
6
20
7
mV
P-P
%
2
0.8
1.3
1.65
100
V
DC
= V
REF
(DC Loop Inactive)
50MHz Bandwidth
V
THADJ
= V
REF
–200
3
25
0
1600
2.0
mV
P-P
kW
V
V/V
mV
µV
200
µA
5
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