19-3242; Rev 0; 4/04
150Mbps Automotive VCSEL Driver
General Description
The MAX3905 150Mbps automotive VCSEL driver
implements low-cost transmitters operating from 8Mbps
to 150Mbps at junction temperatures up to +140°C. The
device accepts single-ended TTL, differential PECL or
LVDS input data, and provides bias and modulation
currents for driving a VCSEL. The output is DC-coupled
to the VCSEL to minimize component count.
The driver provides temperature compensation to
VCSEL high and low currents. Adjustments of the bias
current, modulation current, bias-current temperature
coefficient, and center of the temperature-stable bias
current region are all programmable by wirebond
options. The power-reduction feature decreases output
modulation by approximately 50%. The data squelch
feature disables the VCSEL current when no data is
present.
The MAX3905 is available in die form and operates
from -40°C to +140°C junction temperature, over a +3.0V
to +5.25V supply range.
Features
♦
-40°C to +140°C Operating Junction Temperature
Range
♦
+3.0V to +5.25V Supply Voltage
♦
TTL/CMOS-, LVDS-, or PECL-Compatible Data
Input
♦
Compatible with SP1 Automotive Network
Interface
♦
Wirebond-Adjustable VCSEL Low and High
Currents
♦
Optical Power-Reduction Feature
♦
Output Squelch
MAX3905
Ordering Information
PART
MAX3905E/D
TEMP RANGE
-40°C to +140°C
PIN-PACKAGE
Dice*
Applications
Optical Transmitters for Automotive Networks
Polymer-Clad Silica Fiber-Based Networks
*Dice
are designed to operate from T
J
= -40°C to +140°C, but
are tested and guaranteed at T
A
= +49°C only.
Typical Application Circuits
+5V AUTOMOTIVE TRANSMITTER (TTL NETWORK CHIP INTERFACE, DATA RATE < 50Mbps)
MODULATION
CONTROL
TRANSMIT OPTICAL SUBASSEMBLY (TOSA)
DRIVER T
O
SET
V
CC
= +5V
R
GAIN
V
CC
SUPPLY FILTER
GAIN
TX
TTL OUTPUT
DATA
(SP1 AUTOMOTIVE
NETWORK INTERFACE)
3DB
IN_TTL
MOD1
MOD2
DT01
DT02
V
CC
OUT
IN+
VCSEL
MAX3905
IN-
SQEN
DIFF LOW1
LOW2
TC1
TC2
TC3
V
EE
OUT
GND
BIAS SET
BIAS
TEMPERATURE
COEFFICIENT
INDICATES OPTIONAL
WIREBOND CONNECTION
Typical Application Circuits continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
150Mbps Automotive VCSEL Driver
MAX3905
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, (V
CC
- V
EE
) ..................................-0.5V to +6.0V
Voltage at 3DB, IN+, IN-, IN_TTL, DIFF, OUT,
OUT,
MOD1, MOD2, DT01, DT02,
SQEN,
TEMPSENS ..............................................-0.5V to (V
CC
+ 0.5V)
Voltage at LOW1, LOW2, TC1, TC2, TC3.................-0.5V to +2V
Differential Input Voltage |IN+ - IN-|.......................................V
CC
Current into OUT...............................................................+12mA
Storage Ambient Temperature Range...............-65°C to +150°C
Operating Junction Temperature Range ...........-40°C to +150°C
Electrostatic Discharge (ESD)
(Human Body Model, tested per JES D22-A114) ...............2kV
(Machine Model, tested per JES D22-A115) ..................+400V
Die Attach Temperature...................................................+400°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.25V, T
J
= -40°C to +140°C. Typical values are at V
CC
= +5.0V and T
A
= +25°C, unless otherwise noted.)
PARAMETER
OPERATING CONDITIONS
Voltage at OUT
Data Rate
TTL Data Input-Edge Transition
Time
POWER SUPPLY
Supply Current
Supply Current While Data is
Squelched
CURRENT GENERATOR
LOW1 open, LOW2 open
Low Current (T
J
= DT
0
)
I
DT0
LOW1 GND, LOW2 open
LOW1 open, LOW2 GND
LOW1 GND, LOW2 GND
TC1 open, TC2 open, TC3 open
Low-Current Positive
Temperature Coefficient
(T
J
> DT
0
)
TC
LOW+
TC1 GND, TC2 open, TC3 open
TC1 GND, TC2 GND, TC3 open
TC1 GND, TC2 GND, TC3 GND
TC1 open, TC2 open, TC3 open
Low-Current Negative
Temperature Coefficient
(T
J
< DT
0
)
Width of Temperature-Stable
Low-Current Region
TC
LOW-
TC1 GND, TC2 open, TC3 open
TC1 GND, TC2 GND, TC3 open
TC1 GND, TC2 GND, TC3 GND
T
W
DT01 open, DT02 open
Center of Temperature-Stable
Low-Current Region
DT
0
DT01 V
CC
, DT02 open
DT01 open, DT02 V
CC
DT01 V
CC
, DT02 V
CC
Modulation-Current Temperature
Coefficient
TC
MOD
Relative to I
MOD
at T
J
= +25°C
1.69
2.02
2.35
2.68
12
16
24
36
-18
-24
-36
-54
38
31.5
44
56
68.5
0.311
1.8
2.17
2.53
2.90
16
21
32
48
-16
-21
-32
-47
45
36
49
61
74
0.38
1.91
2.28
2.65
3.02
18
24
36
54
-12
-16
-24
-36
52
41.5
54
66
78.5
0.471
%/°C
°C
°C
µA/°C
µA/°C
mA
I
CC
I
STDBY
Excludes I
OUT
and I
OUT
Excludes I
OUT
and I
OUT
14
14
25
mA
mA
V
OUT
With TTL input
With differential input
One-pole response, 10% to 90%
0.9
8
40
50
150
0.23
V
Mbps
UI
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
150Mbps Automotive VCSEL Driver
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.25V, T
J
= -40°C to +140°C. Typical values are at V
CC
= +5.0V and T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MOD1 open, MOD2 open
Modulation Current at T
J
= +25°C
I
MOD
MOD1 V
CC
, MOD2 open
MOD1 open, MOD2 V
CC
MOD1 V
CC
, MOD2 V
CC
Modulation Current in Low-Power
Mode
Modulation Switching Time
Pulse-Width Variation
Pulse-Width Distortion
Data-Dependent Jitter
Uncorrelated Jitter
Deterministic Jitter
Random Jitter
IN_TTL DATA INPUT
Input Low
Input High
Input Resistance
Input Capacitance
DIFFERENTIAL DATA INPUT
Differential-Input Sensitivity
Differential-Input Overload
Differential-Input Resistance
3DB INPUT
Input Threshold Voltage
3DB Input Voltage
Diagnostic Resistor
DATA SQUELCH
Output Current While Squelched
Time to Squelch
Time to Resume from Squelch
State
ESD PROTECTION
IN+, IN-, TTL_IN, 3DB
Human Body Model
Machine Model
±4
±400
kV
V
I
OFF
t
SQ
t
RS
No input data
(Note 1)
(Note 1)
1
3
8
0.1
50
25
5
µA
µs
µs
R
GAINN
R
GAINL
Normal mode
Low-power mode
V
CC
> 4.75V, normal mode
V
CC
> 4.75V, low-power mode
29
2.0
0.8
16
1.5
V
V
kΩ
1860
8
25
200
mV
P-P
mV
P-P
kΩ
(Note 1)
V
INL
V
INH
-0.03
2.0
4
5.75
0.3
2
+0.80
V
CC
+ 0.3
V
V
kΩ
pF
I
LP
t
r
, t
f
PWV
PWD
DDJ
UJ
DJ
RJ
Relative to programmed nominal, T
J
= +25°C
20% to 80% (Note 1)
(Notes 1, 2)
(Notes 1, 2)
(Notes 1, 2)
(Notes 1, 2)
K28.5 pattern at 125Mbps (Notes 1, 3)
1-0 pattern differential input (Note 1)
85
3
0.97
-0.02
0.004
MIN
2.84
3.44
4.03
4.62
40
TYP
3.01
3.65
4.28
4.91
50
0.2
MAX
3.22
3.88
4.55
5.22
60
0.5
1.03
+0.02
0.01
0.001
200
11
%
ns
UI
UI
UI
UI
ps
P-P
ps
RMS
mA
UNITS
MAX3905
3
Note 1:
These specifications are guaranteed by design and characterization.
Note 2:
Pulse-width variation, pulse-width distortion, data-dependent jitter, and uncorrelated jitter are measured at 45Mbps per
MOST specification of physical Layer (revision 1.1).
Note 3:
Deterministic jitter is measured with a K28.5 pattern (0011 1110 1011 0000 0101). Deterministic jitter is the peak-to-peak
deviation from ideal time crossings, measured at the 50% crossings of the output. Differential data applied to input.
_______________________________________________________________________________________
150Mbps Automotive VCSEL Driver
MAX3905
Typical Operating Characteristics
(LOW[1, 2] = [GND, open], MOD[1, 2] = [open, V
CC
], DT0[1, 2] = [open, open], TC[1, 2, 3] = [GND, GND, open], T
A
= +25°C, unless
otherwise noted.)
SUPPLY CURRENT vs. JUNCTION
TEMPERATURE
EXCLUDES I
OUT
AND I
OUT
MAX3905 toc01
ELECTRICAL EYE DIAGRAM
(45.1Mbps TTL INPUT)
MAX3905 toc02
ELECTRICAL EYE DIAGRAM
(150Mbps DIFFERENTIAL INPUT)
MAX3905 toc03
30
25
SUPPLY CURRETNT (mA)
20
15
10
5
0
K28.5 PATTERN
K28.5 PATTERN
V
CC
= +3.3V
V
CC
= 5.0V
V
CC
= 3.3V
-40 -20
0
20
40
60
80 100 120 140
3.7ns/div
1.12ns/div
JUNCTION TEMPERATURE (
°
C)
OPTICAL EYE DIAGRAM
(45.1Mbps TTL INPUT)
MAX3905 toc04
OPTICAL EYE DIAGRAM
(150Mbps DIFFERENTIAL INPUT)
MAX3905 toc05
BIAS CURRENT vs. JUNCTION
TEMPERATURE
TC[1, 2, 3] = [GND, GND, OPEN]
DT0[1, 2] = [OPEN, OPEN]
LOW[1, 2] = [GND, GND]
LOW[1, 2] = [OPEN, GND]
MAX3905 toc06
6
5
BIAS CURRETNT (mA)
4
3
2
1
0
V
IN
= 5.0V
850nm VCSEL
467MHz LOWPASS FILTER
3.7ns/div
V
CC
= 3.3V
850nm VCSEL
467MHz LOWPASS FILTER
1.12ns/div
LOW[1, 2] = [GND, OPEN]
LOW[1, 2] = [OPEN, OPEN]
-40 -20
80 100 120 140
JUNCTION TEMPERATURE (
°
C)
0
20
40
60
BIAS CURRENT vs. JUNCTION
TEMPERATURE
LOW[1, 2] = [GND, OPEN]
DT0[1, 2] = [OPEN, OPEN]
TC[1, 2, 3] = [GND, GND, GND]
TC[1, 2, 3] = [GND, GND, OPEN]
MAX3905 toc07
MODULATION CURRENT
vs. JUNCTION TEMPERATURE
7
MODULATION CURRENT (mA)
6
5
4
3
2
1
0
-40 -20
0
MOD[1, 2] = [V
CC
, OPEN]
MOD[1, 2] = [OPEN, OPEN]
80 100 120 140
JUNCTION TEMPERATURE (
°
C)
20
40
60
MOD[1, 2] = [V
CC
, V
CC
]
MOD[1, 2] = [OPEN, V
CC
]
MAX3905 toc08
7
6
BIAS CURRETNT (mA)
5
4
3
2
1
0
8
DT
0
= +36
°
C
TC[1, 2, 3] = [GND, OPEN, OPEN]
TC[1, 2, 3] = [OPEN, OPEN, OPEN]
-40 -20
80 100 120 140
JUNCTION TEMPERATURE (
°
C)
0
20
40
60
4
_______________________________________________________________________________________
150Mbps Automotive VCSEL Driver
Typical Operating Characteristics (continued)
(LOW[1, 2] = [GND, open], MOD[1, 2] = [open, V
CC
], DT0[1, 2] = [open, open], TC[1, 2, 3] = [GND, GND, open], T
A
= +25°C, unless
otherwise noted.)
DETERMINISTIC JITTER vs. JUNCTION
TEMPERATURE
MOD[1, 2] = [OPEN, OPEN]
MOD[1, 2] = [V
CC
, OPEN]
MAX3905 toc11
MAX3905
OUTPUT SQUELCH
MAX3905 toc09
OUTPUT RESUME FROM SQUELCH
MAX3905 toc10
120
100
80
60
40
20
MOD[1, 2] = [OPEN, V
CC
]
MOD[1, 2] = [V
CC
, V
CC
]
V
IN
V
IN
OPTICAL
POWER
OUTPUT
t
SQ
2µs/div
OPTICAL
POWER
OUTPUT
t
RS
DETERMINISTIC JITTER (ps
P-P
)
150Mbps K28.5 PATTERN
0
40ns/div
-40 -20
80 100 120 140
JUNCTION TEMPERATURE (
°
C)
0
20
40
60
RANDOM JITTER
vs. JUNCTION TEMPERATURE
5.5
RANDOM JITTER (ps
RMS
)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
-40 -20
0
20
40
60
80 100 120 140
JUNCTION TEMPERATURE (
°
C)
MAX3905 toc12
PULSE-WIDTH VARIATION AND AVERAGE
PULSE-WIDTH DISTORTION
MAX3905 toc13
6.0
45.1Mbps TTL
BIPHASE-CODED DATA
10ns/div
_______________________________________________________________________________________
5
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