02042-DSH-002-A 8/03 August 2003
Preliminary Information
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1,
IEEE1394
Data Sheet
Information provided in this Data Sheet is PRELIMINARY and is subject to change without
notice. Mindspeed Technologies™, Inc, Proprietary and Confidential
02042-DSH-002-A 8/03 Page 2 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
TABLE OF CONTENTS
Features ...........................................................................................................................................................3
Applications ......................................................................................................................................................3
Connections ......................................................................................................................................................3
General Description ..........................................................................................................................................3
Table 1 Ordering Information ............................................................................................................................3
Top Level Diagram ...........................................................................................................................................3
Table 2 Pin Descriptions ...................................................................................................................................4
Table 3 Absolute Maximum Ratings .................................................................................................................5
Table 4 DC Electrical Characteristics ...............................................................................................................5
Table 5 AC Electrical Characteristics ...............................................................................................................5
Typical Applications Circuit ...............................................................................................................................6
Functional Description ......................................................................................................................................6
Current Switch ..................................................................................................................................................6
LED Drive and Temperature Compensation ....................................................................................................6
Transmit Enable/Disable ..................................................................................................................................7
Pre-emphasis or ‘Peaking’ ................................................................................................................................7
LED clamping, Laser driving .............................................................................................................................7
LED drive Pulse Width Adjust (PWA) ...............................................................................................................8
Eye Diagram......................................................................................................................................................8
Evaluation Board ...............................................................................................................................................9
Bare Die ..........................................................................................................................................................10
Table 6 Bare Die Pad Coordinates ...................................................................................................................10
TSSOP20 Package Information .......................................................................................................................11
QSOP16 Package Information .........................................................................................................................12
Table 7 TSSOP20 Dimensions .........................................................................................................................12
Table 8 QSOP16 Dimensions ..........................................................................................................................12
Table 9 Temperature Compensation Tables.....................................................................................................14
Disclaimer .........................................................................................................................................................15
Contact Information ...........................................................................................................................................16
02042-DSH-002-A 8/03 Page 3 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
FEATURES
Data rates to >500 Mbps, depending on LED
Single chip solution, available as die or in TSSOP20,
QSOP16 or Narrow body SO16 fabricated in deep
sub-micron CMOS for lowest cost & power
consumption and long term reliability
Programmable output current from 30 mA to 120 mA
RC programmable pre-emphasis or ‘peaking’ circuit
giving drive current rise and fall times <500 ps
Resistor programmable compensation for
temperature dependence of LED output power
PECL input with optional Pulse Width Adjust
Single-ended CMOS input compatible at low speeds
VREF voltage generator and output pin
Supports most LED types (e.g. 660 to 1300 nm)
Single +5 V to +3.3 V operation
APPLICATIONS
FDDI, fiber Channel
Fast Ethernet, IEEE1394
OC3/STM1
CONNECTIONS
GENERAL DESCRIPTION
The MC2042-3 is a CMOS IC designed for high-speed
LED drive in low-cost optical fiber based transmission
systems. Depending on the LED used, data rates to
>500Mbps can be achieved.
The LED drive current is set by a resistor. To improve LED
‘on’ time, a pre-emphasis circuit is included, which may be
set via a simple RC network.
To minimize the effects of temperature on LED output
power, LED drive temperature compensation can be set
by resistor over a 0 - 10,000 ppm/°C range.
Differential positive-ECL (PECL) data on the input pins
can be shaped, if desired, by the differential voltage on
the Pulse Width Adjust (PWA) pins. This adjustment is
continuous over a ±500 ps range. In addition, the VREF
output pin allows single-ended input to the MC2042 and
provides compatibility with industry-standard FO
modules.
TABLE 1 ORDERING INFORMATION
TOP LEVEL DIAGRAM
6.5 x 4.4mm TSSOP Package
4.3 x 3.9mm QSOP Package
Fig.1 TOP VIEWS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
MC2042-3
PWA-
NC
DIN
DIN
VREF
RESET2
RTSET
VDD1
PWA-
NC
GND
VDD2
GND
IOUT
IOUT
IOUT
PEAK
VDD2
NC
NC
TSSOP20
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
MC2042-3
GND
V
DD2
GND
IOUT
IOUT
IOUT
PEAK
V
DD2
QSOP16
PWA-
V
DD1
PWA+
D
IN
D
IN
V
REF
RTSET2
RTSET
Part Pin-Package
MC2042-3DIE Waffle Pack
MC2042-3DIEW Expanded Whole Wafer on a Ring
MC2042-3Q16 QSOP16
MC2042-3T20 TSSOP20
MC2042-3S16 SOIC16
MC2042-3Q16TR QSOP16 Tape and Reel
MC2042-3T20 TSSOP20 Tape and Reel
Fig. 2
Input Data Pulse Shaping
VREF Generator
GND GND RTSET RTSET2
PEAK
VDD2
VDD1
DIN
PWA
IOUT
PWA
DIN
VREF
Current Switch and Peaking
Control
Programmable
Current Sink
IOUT
02042-DSH-002-A 8/03 Page 4 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
TABLE 2 PIN DESCRIPTIONS
TSSOP20
Pin
QSOP16
Pin SOIC16 Die
Pin Name Description
1 - - - NC Not connected, leave open
2 1 13 13 PWA Inverse pulse width adjust input
3 2 14 14 PWA Differential pulse width adjust input. Allows continuous
adjustment of input data pulse width
4 3 15 15 DIN Differential data input
5 4 16 16 DIN Inverse differential data input
6511
VREF Reference output. Can be used with single-ended data
input
7622
RTSET2
Temperature compensation adjustment pin. Allows
temperature dependence of LED light output to be
reduced or removed
8733
RTSET Sets nominal LED drive current
9844
VDD1 Power pin, connect to most positive supply
10 - 5 - NC Not connected
11 - 10 - NC Not connected
12 9 6 5 VDD2 LED shorting pin, connect to most positive supply.
Speeds LED switch off
13 10 - 6 VDD2 LED shorting pin, connect to most positive supply.
Speeds LED switch off
14 11 7 7 PEAK Connection for pre-emphasis or peaking circuit
15 12 8 8 IOUT Driver output. Connect LED between this pin and VDD
16 13 - 9 IOUT Driver output. Connect LED between this pin and VDD
17 14 9 10 IOUT
Logical inverse of pin Iout. Connect resistor of
approximately the same value as LED (at the
programmed drive current level) between this pin and
VDD
18 15 11 11 GND Ground pin. Connect to the most negative supply
19 16 12 12 GND Ground pin. Connect to the most negative supply
20 - - - NC Not connected, leave open
02042-DSH-002-A 8/03 Page 5 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
TABLE 3 ABSOLUTE MAXIMUM RATINGS
These are the absolute maximum ratings at or beyond which the IC can be expected to fail or be damaged. Reliable
operation at these extremes for any length of time is not implied.
TABLE 4 DC ELECTRICAL CHARACTERISTICS
TABLE 5 AC ELECTRICAL CHARACTERISTICS
Symbol Parameter Rating Units
PTOT Total power dissipation (TSSOP20) 255 mW
VCC Power supply (VCC-GND) 7V
TJJunction temperature 150 °C
TAOperating ambient -40 to +85 °C
TSTG Storage temperature -65 to +150 °C
Symbol Parameter Min Typ Max Units
VCC Supply Voltage 3.0 - 5.5 V
Din Allowable voltage at data inputs Gnd - 0.3 - VCC+0.3
ILED’ ON LED drive current 30 - 120 mA
ILED’ OFF LED off current - - 50 µA
ICOMP LED drive current temperature compensation range 0 - 1 %/°C
V_LED_H minimum allowable voltage at IOUT VDD-2.0 --V
Symbol Parameter Min Typ Max Units
Vin(Diff) Differential Input Voltage, 2*(DinH - DinL) 300mV - 2*Vcc V
Common Mode Input Voltage VCC/2 -(Vcc-(Vin[Diff])/4) V
fCMaximum data rate 300 - - Mbps
TPWA Input data pulse width adjust range -500 - 500 ps
LED trLED drive rise time - - 1 ns
LED tfLED drive fall time - - 1 ns
IPEAK Peaking current (as % of LED drive current) 0 - 50 %
PEAK trPeaking current rise time - - 1 ns
PEAK tfPeaking current fall time - - 1 ns
PEAK tdPeaking current decay time - C1x(R4+5) - S
IDD Supply current - - ILED+20 mA
02042-DSH-002-A 8/03 Page 6 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
TYPICAL APPLICATIONS CIRCUIT
Signal Path Description
Differential Positive-ECL (PECL) data on the data input
pins controls the LED current switch. The LED current
flows either through the LED or via the dummy load so
that VDD noise is minimized. To reduce LED ‘turn-off’
time, the LED is momentarily short-circuited, via VDD2,
before the current is switched to the dummy load.
LED Drive and Temperature
Compensation
The LED drive current and temperature compensation is
set by the two resistors R1 and R2. The simplified
application diagram (Figure 3) shows R1 connected
between RTSET and GND, and R2 between RTSET and
the RTSET2 pin.
The current flowing out of the RTSET pin determines the
LED drive current.
The temperature independent component of the LED
drive current is set primarily by R1. The temperature
dependent component by R2. However, R1 and R2 are
not independent.
The RTSET2 pin connects to an internal diode on the IC
which exhibits standard diode behaviour with
temperature. As temperature rises, the voltage on the
diode drops, the current flowing through R2 increases and
the LED drive current increases.
Given the various interdependencies of the drive current,
R1, R2, and temperature compensation, the relationships
have been tabulated (see Temperature Compensation
table). Please contact Mindspeed if other combinations
are required.
The LED 'on' current is controlled to ±10%.
A Microsoft Excel file is available from Mindspeed which
will calculate appropriate values for RTset resistors R1
Input Data Pulse Shaping Current Switch and Peaking
Control
VREF Generator Programmable
Current Sink
GND GND2 RTSET RTSET2
IOUT PEAK
VDD2
VDD1
DIN
PWA
IOUT
PWA
DIN
R4 C1
R1
R2
LED
Dummy
LED Load
VCC
VREF
Optional Peaking
Fig. 3
FUNCTIONAL DESCRIPTION
02042-DSH-002-A 8/03 Page 7 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
FUNCTIONAL DESCRIPTION
and R2 given your LED current, forward voltage, and LED
temperature coefficient. The file may be obtained from a
Mindspeed Field Applications Engineer and is named
'MC2042-3 resistor selection.xls'. See section
Temperature Compensation Tables if the spreadsheet is
not available.
Transmit Enable/Disable
There is no dedicated pin on the MC2042 to disable the
LED drive current. However, the LED drive current can
be disabled by disabling the current out of pin RTSET.
The LED current is approximately 100x the current out of
pin RTSET, so if the current out of this pin is 0, the LED
drive current is 0. However, if peaking is used the peaking
current will not be disabled.
Figure 5 illustrates how the current out of RTSET can be
disabled by adding a MOSFET (Q1) at the RTSET node
of the R1/R2 temperature compensation network. The
voltage on the gate of Q1 then controls transmit enable/
disable. When selecting Q1, a MOSFET should be
chosen with an Rds(on) which is negligible compared to
R1 and R2.
Pre-Emphasis Or ‘Peaking’
To improve LED ‘turn on’ time an optional pre-emphasis
function is included on the MC2042-3. If this is not
required, then the PEAK pin should be left floating.
Two external components (R4, C1) are required as shown
in Fig. 3 to implement peaking.
When the LED is turned on, the voltage on PEAK is pulled
LOW very rapidly. This voltage transient is coupled
through R4 and C1 and exerts a transient current on the
LED.
When the LED is turned off, the voltage on PEAK is pulled
HIGH rapidly. This voltage transient is coupled through
R4 and C1 and exerts a transient current in the opposite
direction on the LED.
The transient current amplitude and RC decay are given
approximately by:
Peak current (Amps): 4/(R4 + 5)
Decay (seconds): C1 x (R4 + 5)
The above approximations assume an ideal LED model
with 0 Ohms resistance. Real LEDs will slightly alter the
peaking effect. Typical values for R4 and C1 are:
R4 = 50 Ω
C1 = 20 pF
LED Clamping, Laser Driving
Since most LEDs exhibit a longer ‘turn off’ time than ‘turn
on’ time, a clamping function is included on the MC2042
in order to reduce the ‘turn off’ time. Clamping is enabled
via the two VDD2 connections.
The disadvantage of clamping is that the LED’s internal
capacitance has to be fully charged again before the LED
starts to emit light. This delayed ‘turn on’ effect becomes
noticeable when the nominal LED drive current is low.
Use of the peaking circuit helps solve this problem. Thus,
the combination of peaking and clamping results in very
fast ‘turn on’ and ‘turn off’ times for the LED.
When driving lasers, it will often be helpful to disable this
clamping. This can be achieved by leaving the VDD2
connections floating. VDD1 must still be connected.
R1
R2
RTSET
RTSET2
(unused)
External Diode
for Temp. Comp.
Fig. 4
R1
R2
RTSET RTSET2
Transmit Enable
Fig. 5
Q1
02042-DSH-002-A 8/03 Page 8 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
LED Drive Pulse Width Adjust (PWA)
The input pulse width can be adjusted prior to application
to the LED switch. The differential voltage on the PWA
(Pulse Width Adjust) pins shapes the input pulse linearly
over a nominal -500 to +500 ps range, according to the
formula:
Delta PW (ps) = K x VPWA
Where:
K = 500 ± 100
and
VPWA = (VPWA+) - (VPWA-)
The maximum range for VPWA is ±1V. The input
impedance is 3.6 kΩ. VPWA+ and VPWA- will settle at a
nominal voltage equal to (0.6 * VDD) if left floating. It is
recommended that adjustment be implemented by pull
down resistors on PWA+ or PWA-. However, it is
common for one or other pin to be tied to ground as a
zero-cost, ‘gross’ adjustment.
If pulse width adjustment is not required PWA+ and PWA-
should be tied to ground.
Eye Diagram
The eye diagram below is typical of the electrical output of
the MC2042-3. The crossover point can be moved up and
down using the PWA pin. The overshoot can be increased
by using the PEAK pin.
FUNCTIONAL DESCRIPTION
Fig. 6
02042-DSH-002-A 8/03 Page 9 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
1 2 34
A
B
C
D
4
321
D
C
B
A
MICROCOSM COMMUNICATIONS LTD
UNIVERSITY GATE
PARK ROW
BRISTOL.
MC2042-3 EVALUATION BOARD
MC2042
1
1SHEET
OF 1
DOC_NO
REV
TITLE
N/C 20
GND 19
GND 18
IOUTB 17
IOUT 16
IOUT 15
PEAK 14
VDD2 13
RTSET
8
RTSET2
7
VBB
6
DIN-
5
DIN+
4
PWA+
3
PWA-
2
N/C
1
VDD1
9
N/C
10
VDD2 12
N/C 11
IC1
MICROCOSM MC2042-3
VCC1
VCC1
C1
10NF
R1
0R
VCC2
C2
10NF
R2 N/C
R3 N/C
R4 22R
C4
18PF
C5 100NF
C3
10NF
SK1
SK2
CATHODE
ANODE
VCC2
VBB
R5
50R
R6
50R
C6
100NF
1
2
SK4
1
2
SK5
DATA INPUTS
LED INTERFACE
R8
N/C
R9
N/C
VCC1
1
2
SK6
DATA_CMOS
DATA_IN
DATA_INB
R11
N/C
R12
N/C
VCC1
R13
N/C
R14
N/C
R10
1K
R17
50K
R18
50K
R7
10K
R19
50K
C8
100NF
CAN_GND
SK3
R15
N/C
R16
N/C
C11
10NF
C12
10NF LED PULSE WIDTH
ADJUST
SET LED
TEMP COMP
SET NOMINAL LED
DRIVE CURRENT
1
2
3
HD1
VCC1
3.3V
0V
+C10
10UF
POWER
L1
EXCCL3216U
L2
EXCCL3216U
C7
100NF
VCC2
C9
100NF
General
-------------
The board allows the user full flexibility for determining the
resistor valuesrequired for the pulse width adjust, LED current
and LED temperature compensation functions.
Controls
--------------
Pulse width adjust - R17/R18
These pots can be altered to give a total of +/- 500 pS
Pulse width adjustment. No adjustment occurs if PWA +
& PWA- are tied to gnd. Maximum adjustment in either direction
is obtained by connecting PWA+ to VCC and PWA- to gnd ,
or viceversa.
This board is provided for evaluation of the MC2042-3
LED drive current & temp compensation - R19 & R7
The drive current and temperature compensation
is determined by two potentiometers , R19 & R7
respectively .LED turn-on time can be improved by
proper selection of R2, R3 & C4. Refer to Microcosm
documentation for selection of these values.
Inputs
-----------
SK4 & SK5 are provided for the connection of
differential PECL input signals. Alternatively a CMOS
input may be connected to SK6.If using SK6, remove
R6, C5 & C6 and fit R8 & R9 with 1K resistors.
Evaluation Board
An electrical evaluation board is available for the
MC2042-3. Its schematic is shown below.
Fig. 7
02042-DSH-002-A 8/03 Page 10 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
BARE DIE
TABLE 6 BARE DIE PAD COORDINATES
Pad Description X Y Pad Description X Y
1VREF -73 394.5 9 IOUT 73 -394.5
2RTSET2 -219 394.5 10 IOUT 219 -394.5
3RTSET -397 214.7 11 GND 397 -223.3
4VDD1 -397 68.7 12 GND 397 -77.3
5VDD2 -397 -77.3 13 PWA 397 68.7
6VDD2 -397 -223.3 14 PWA 397 214.7
7 PEAK -219 -394.5 15 DIN 219 394.5
8IOUT -73 -394.5 16 DIN 73 394.5
RTSET
VDD1
PEAK
IOUT
GND
PWA
DIN
VREF
VDD2
VDD2
IOUT
IOUT
GND
PWA
DIN
RTSET2
1
2
3
4
5
6
789
10
11
12
13
14
15
16
Fig. 8
Die size: 1.0 x 1.0 mm
Pad openings: 95 um square
02042-DSH-002-A 8/03 Page 11 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
TSSOP20 PACKAGE INFORMATION
Note:
Package dimensions on page 12.
Fig. 9
02042-DSH-002-A 8/03 Page 12 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
QSOP16 PACKAGE INFORMATION
TABLE 7 TSSOP20 DIMENSIONS TABLE 8 QSOP16 DIMENSIONS
Fig. 10
Dims. Tols/leads TSSOP20L
A MAX 1.20
A1 0.5MIN/.10MAX.
A2 NOM .90
D ±.05 6.50
E ±.10 6.40
E1 ±.10 4.40
L +.15/-.10 .60
L1 REF. 1.00
Zp REF. .325
e BASIC .65
b±.05 .22
c .13MIN/.20MAX
e ±4° 4°
aaa MAX. .10
bbb MAX. .10
ccc MAX .05
ddd MAX. .20
Dims. Tols/N QSOP16
A MAX. 1.60
A1 ±.05 0.1
A2 ±.10 1.40
D ±.10 4.9
E ±.20 6.00
E1 ±.10 3.90
L ±.05 0.6
ccc MAX. 0.10
ddd MAX. 0.10
e BASIC 0.65
b ±.05 0.25
c±.05.2 Min.
.24 Max.
R ±.05 0.20
R1 Min. 0.20
02042-DSH-002-A 8/03 Page 13 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
Temperature Compensation Tables
On following Page - Showing R1 from 1k8 to 47k ohms
and R2 from 47 to 4k7 ohms.
Choose the desired ILED at 2 different die temperatures
to select appropriate R1/R2 values. NOTE: the tables are
based on MC2042-3 junction temperatures (Tj), at 50°
and 125°C. The user must take into account the power
dissipation and thermal resistance to arrive at the die
temperature.
Example, at Vcc=5v:
Then R1=3300, R2= 270 ohms (shaded) is one
possible solution.
89
16
1
150Mil, Narrow-body SO16
MC2042 Pinouts: drawings not to scale
Din-
PWA+
PWA-
Gnd
Gnd
Ioutb
NC
Din+
Vbb
Rtset2
RTSet
Vdd1
NC
Vdd2
Iout
Peak
Fig. 11
Ambient 25 85 °C
Iled 70 100 mA
VLed 1.5 1.5 v
Pstatic 50 50 mW
Pdynamic (Vcc-VLed)*(70) = 245 350 mW
Rt 100 100 °C/Watt
Tj Ta+24.5+5 = 54.5 85+35+5 = 125 °C
02042-DSH-002-A 8/03 Page 14 of 16
MC2042-3
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel, OC3/STM-1, IEEE1394
Preliminary Information
Information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Mindspeed Technologies™, Proprietary and Confidential
Tj=50 1800 2200 2700 3300 3900 4700 5600 6800 8200 10000 12000 15000 18000 22000 27000 33000 39000 47000
47 135.9 131.4 127.7 124.7 122.7 120.8 119.3 117.9 116.9 115.9 115.2 114.5 114 113.6 113.2 112.9 112.7 112.5
56 130.8 126.1 122.3 119.2 117.1 115.1 113.5 112.1 111 110 109.2 108.5 108 107.5 107.1 106.8 106.6 106.4
68 125 120.1 116.1 112.9 110.6 108.6 106.9 105.4 104.3 103.2 102.4 101.6 101.1 100.6 100.2 99.92 99.7 99.49
82 119.4 114.3 110.1 106.7 104.4 102.2 100.5 98.92 97.67 96.58 95.76 94.93 94.39 93.89 93.47 93.14 92.91 92.7
100 113.4 108 103.6 100.1 97.68 95.4 93.62 91.98 90.68 89.54 88.68 87.81 87.24 86.72 86.28 85.93 85.69 85.47
120 107.9 102.4 97.81 94.14 91.61 89.24 87.39 85.68 84.32 83.14 82.24 81.34 80.74 80.2 79.75 79.38 79.13 78.9
150 101.4 95.68 90.87 87.04 84.38 81.9 79.96 78.17 76.75 75.51 74.56 73.62 73 72.42 71.95 71.57 71.31 71.06
180 96.38 90.41 85.44 81.47 78.72 76.14 74.13 72.28 70.8 69.51 68.53 67.56 66.91 66.31 65.82 65.43 65.15 64.9
220 91.09 84.92 79.76 75.64 72.79 70.12 68.03 66.1 64.57 63.23 62.21 61.2 60.52 59.91 59.39 58.98 58.7 58.44
270 86.06 79.68 74.35 70.08 67.12 64.36 62.19 60.19 58.6 57.21 56.16 55.11 54.4 53.77 53.23 52.81 52.51 52.24
330 81.51 74.94 69.44 65.04 61.99 59.13 56.89 54.82 53.18 51.74 50.65 49.56 48.83 48.17 47.62 47.18 46.88 46.59
390 78.03 71.3 65.68 61.17 58.04 55.11 52.81 50.69 49 47.52 46.4 45.28 44.54 43.86 43.29 42.84 42.53 42.23
470 74.46 67.58 61.82 57.19 53.98 50.97 48.61 46.43 44.69 43.18 42.02 40.87 40.1 39.41 38.82 38.36 38.04 37.74
560 71.43 64.41 58.52 53.79 50.51 47.43 45.01 42.78 41 39.45 38.26 37.08 36.29 35.58 34.98 34.5 34.17 33.86
680 68.4 61.24 55.23 50.4 47.04 43.88 41.4 39.12 37.29 35.7 34.48 33.27 32.46 31.73 31.11 30.62 30.28 29.97
820 65.8 58.52 52.4 47.47 44.04 40.82 38.29 35.95 34.08 32.45 31.21 29.97 29.14 28.38 27.76 27.25 26.91 26.58
1000 63.37 55.97 49.74 44.72 41.23 37.94 35.35 32.96 31.05 29.38 28.11 26.84 25.99 25.22 24.58 24.06 23.71 23.37
1200 61.41 53.91 47.59 42.5 38.94 35.6 32.96 30.53 28.59 26.88 25.58 24.29 23.42 22.63 21.98 21.45 21.09 20.75
1500 59.33 51.72 45.31 40.12 36.51 33.1 30.41 27.93 25.94 24.2 22.87 21.55 20.66 19.85 19.18 18.64 18.27 17.92
1800 57.86 50.18 43.69 38.45 34.78 31.33 28.6 26.08 24.06 22.29 20.94 19.59 18.69 17.87 17.18 16.63 16.25 15.9
2200 56.46 48.7 42.15 36.84 33.13 29.63 26.87 24.31 22.26 20.46 19.08 17.71 16.79 15.95 15.26 14.7 14.31 13.95
2700 55.23 47.42 40.8 35.44 31.69 28.15 25.35 22.75 20.67 18.84 17.45 16.05 15.11 14.26 13.55 12.98 12.59 12.22
3300 54.21 46.34 39.68 34.27 30.48 26.9 24.07 21.44 19.33 17.48 16.06 14.65 13.7 12.83 12.11 11.53 11.13 10.76
3900 53.48 45.57 38.87 33.42 29.61 26 23.15 20.5 18.37 16.5 15.07 13.63 12.67 11.79 11.06 10.48 10.07 9.692
4700 52.77 44.82 38.08 32.61 28.77 25.13 22.26 19.58 17.43 15.54 14.09 12.64 11.67 10.78 10.04 9.448 9.036 8.65
Tj=125 1800 2200 2700 3300 3900 4700 5600 6800 8200 10000 12000 15000 18000 22000 27000 33000 39000 47000
47 182.3 181.2 180.2 179.3 178.7 178.1 177.6 177.1 176.7 176.3 176.1 175.8 175.6 175.4 175.3 175.2 175.1 175
56 179.2 177.7 176.3 175.1 174.3 173.4 172.7 172 171.5 171 170.6 170.3 170 169.8 169.6 169.4 169.3 169.2
68 174.6 172.5 170.6 168.9 167.7 166.5 165.5 164.6 163.9 163.2 162.7 162.2 161.9 161.6 161.3 161.1 160.9 160.8
82 168.8 166 163.4 161.2 159.6 158.1 156.9 155.7 154.7 153.9 153.2 152.6 152.1 151.7 151.4 151.1 150.9 150.8
100 161.1 157.4 154.1 151.3 149.4 147.5 146.1 144.7 143.6 142.6 141.9 141.2 140.7 140.2 139.8 139.5 139.3 139.1
120 152.8 148.4 144.6 141.6 139.4 137.3 135.7 134.2 132.9 131.9 131.1 130.2 129.7 129.2 128.8 128.4 128.2 128
150 141.9 137 132.7 129.3 126.8 124.5 122.7 121 119.7 118.5 117.6 116.7 116.1 115.6 115.1 114.8 114.5 114.3
180 133 127.6 123.1 119.3 116.7 114.3 112.4 110.6 109.2 108 107.1 106.1 105.5 104.9 104.5 104.1 103.8 103.6
220 123.4 117.7 112.8 108.9 106.2 103.7 101.7 99.84 98.37 97.08 96.11 95.13 94.48 93.89 93.39 93 92.72 92.47
270 114.2 108.2 103.1 99.07 96.26 93.61 91.54 89.62 88.09 86.75 85.74 84.72 84.04 83.42 82.91 82.49 82.21 81.94
330 105.9 99.67 94.44 90.24 87.32 84.58 82.43 80.44 78.85 77.46 76.41 75.35 74.64 74 73.47 73.04 72.74 72.46
390 99.6 93.2 87.83 83.52 80.51 77.69 75.48 73.43 71.8 70.36 69.28 68.19 67.46 66.8 66.25 65.81 65.5 65.22
470 93.2 86.63 81.11 76.67 73.58 70.67 68.39 66.28 64.59 63.12 61.99 60.87 60.12 59.44 58.87 58.42 58.1 57.8
560 87.79 81.06 75.41 70.86 67.69 64.71 62.36 60.19 58.46 56.95 55.79 54.64 53.87 53.17 52.58 52.11 51.79 51.49
680 82.43 75.55 69.76 65.09 61.83 58.77 56.36 54.14 52.36 50.8 49.61 48.42 47.63 46.91 46.31 45.82 45.49 45.18
820 77.87 70.85 64.93 60.15 56.83 53.69 51.22 48.94 47.12 45.52 44.3 43.08 42.26 41.52 40.9 40.41 40.07 39.74
1000 73.63 66.47 60.43 55.55 52.15 48.94 46.41 44.07 42.2 40.56 39.31 38.06 37.22 36.46 35.83 35.32 34.97 34.64
1200 70.22 62.95 56.81 51.84 48.37 45.1 42.52 40.14 38.23 36.55 35.27 33.99 33.14 32.36 31.71 31.19 30.83 30.49
1500 66.63 59.23 52.97 47.91 44.37 41.03 38.39 35.95 33.99 32.27 30.97 29.65 28.77 27.97 27.31 26.77 26.4 26.05
1800 64.11 56.62 50.28 45.15 41.55 38.16 35.48 32.99 31 29.25 27.92 26.58 25.68 24.87 24.19 23.64 23.26 22.91
2200 61.72 54.15 47.73 42.52 38.87 35.42 32.7 30.17 28.14 26.36 25 23.63 22.72 21.89 21.19 20.63 20.25 19.88
2700 59.65 52 45.5 40.23 36.53 33.03 30.27 27.7 25.64 23.82 22.44 21.05 20.11 19.27 18.56 17.99 17.59 17.22
3300 57.93 50.21 43.65 38.32 34.58 31.04 28.24 25.63 23.54 21.7 20.29 18.87 17.93 17.06 16.34 15.76 15.36 14.98
3900 56.7 48.93 42.33 36.96 33.18 29.61 26.78 24.15 22.03 20.17 18.74 17.31 16.35 15.47 14.74 14.15 13.74 13.36
4700 55.52 47.7 41.05 35.64 31.84 28.23 25.37 22.71 20.57 18.68 17.24 15.79 14.81 13.93 13.18 12.59 12.17 11.78
TABLE 9 TEMPERATURE COMPENSATION TABLE
MC2042-3
02042-DSH-002-A 8/03 Page 15 of 16
LED/Laser Driver for FDDI, Fast Ethernet, Fibre Channel OC3/STM-1
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02042-DSH-002-A 8/03 Page 16 of 16
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