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PDF MAX3869 Data sheet ( Hoja de datos )
| Número de pieza | MAX3869 | |
| Descripción | +3.3V / 2.5Gbps SDH/SONET Laser Driver with Current Monitors and APC | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1570; Rev 0; 12/99
EVAALVUAAILTAIOBNLEKIT
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
General Description
The MAX3869 is a complete, single +3.3V laser driver
for SDH/SONET applications up to 2.5Gbps. The
device accepts differential PECL data and clock inputs
and provides bias and modulation currents for driving a
laser. A synchronizing input latch can be used (if a
clock signal is available) to reduce jitter.
An automatic power control (APC) feedback loop is
incorporated to maintain a constant average optical
power over temperature and lifetime. The wide modula-
tion current range of 5mA to 60mA and bias current of
1mA to 100mA are easy to program, making this prod-
uct ideal for use in various SDH/SONET applications.
The MAX3869 also provides enable control, two current
monitors that are directly proportional to the laser bias
and modulation currents, and a failure-monitor output to
indicate when the APC loop is unable to maintain the
average optical power. The MAX3869 is available in a
small 32-pin TQFP package as well as dice.
Applications
SONET/SDH Transmission Systems
Add/Drop Multiplexers
Digital Cross-Connects
Section Regenerators
2.5Gbps Optical Transmitters
Features
o Single +3.3V or +5V Power Supply
o 64mA Supply Current at +3.3V
o Programmable Bias Current from 1mA to 100mA
o Programmable Modulation Current from
5mA to 60mA
o Bias Current and Modulation Current Monitors
o 87ps Rise/Fall Time
o Automatic Average Power Control with Failure
Monitor
o Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
o Enable Control
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX3869EHJ
-40°C to +85°C 32 TQFP-EP*
MAX3869E/D
-40°C to +85°C Dice**
*EP = Exposed Paddle.
**Dice are designed to operate over this range, but are tested and
guaranteed at TA = +25°C only. Contact factory for availability.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
+3.3V
+3.3V
124Ω 124Ω 124Ω 124Ω
MAX3890
SERIALIZER
WITH
CLOCK GEN.
84.5Ω 84.5Ω 84.5Ω 84.5Ω
DATA+
DATA-
CLK+ MAX3869
CLK-
25Ω
OUT-
OUT+
BIAS
MD
FERRITE
BEAD
0.01µF
LD
23Ω
0.056µF
BIASMON
MODMON
1000pF
+3.3V
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
Typical Operating Characteristics (continued)
(VCC = +3.3V, load as shown in Figure 2, TA = +25°C, unless otherwise noted.)
ELECTRICAL EYE DIAGRAM
(IMOD = 30mA, 213-1 +80 CID, 32 TQFP-EP)
ELECTRICAL EYE DIAGRAM
(IMOD = 60mA, 213-1 +80 CID, 32 TQFP-EP)
120
100
80
60
40
20
0
1
100ps/div
IBIASMAX vs. RBIASMAX
10
RBIASMAX (kΩ)
100
300
100
90
80
70
60
50
40
30
20
10
0
1
100ps/div
IMOD vs. RMODSET
10
RMODSET (kΩ)
100
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
5
RANDOM JITTER vs. IMOD
10 15 20 25 30 35 40 45 50
IMOD (mA)
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.1
IMD vs. RAPCSET
1 10
RAPCSET (kΩ)
100
SUPPLY CURRENT vs. TEMPERATURE
(EXCLUDE IBIAS, IMOD, 25Ω LOAD)
100
90
80 VCC = +5.5V
70
60 VCC = +3.14V
50
40
30
20
10
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
BIAS-CURRENT MONITOR GAIN
vs. TEMPERATURE
50
40 IBIAS = 100mA, IMOD = 50mA
IBIAS = 10mA, IMOD = 10mA
30
20
10
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 5
5 Page 
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
Determine RBIASMAX
Calculate the maximum threshold current (ITH(MAX)) at
TA = +85°C and end of life. Assuming ITH(MAX) =
50mA, the maximum bias current should be:
IBIASMAX = ITH(MAX) + IMOD/2
In this example, IBIASMAX = 68.1mA. The IBIASMAX vs.
RBIASMAX graph in the Typical Operating Characteristics
shows that RBIASMAX should be 3.2kΩ.
Modulation Currents Exceeding 60mA
With a +5V power supply, the headroom voltage for the
MAX3869 is significantly improved. In this case, it is
possible to achieve a modulation current of more than
60mA with AC-coupling, if the junction temperature is
kept below 150°C. The MAX3869 can also be DC-cou-
pled to a laser diode when operating with a +5V sup-
ply; the voltage at OUT+ should be ≥ 2.0V for proper
operation.
Wire Bonding Die
For high current density and reliable operation, the
MAX3869 uses gold metalization. Make connections to
the die with gold wire only, using ball-bonding tech-
niques. Wedge bonding is not recommended. Die-pad
size is 4 mils (100µm) square, and die thickness is 12
mils (300µm) square.
Layout Considerations
To minimize inductance, keep the connections between
the MAX3869 output pins and LD as close as possible.
Optimize the laser diode performance by placing a
bypass capacitor as close as possible to the laser
anode. Use good high-frequency layout techniques
and multilayer boards with uninterrupted ground planes
to minimize EMI and crosstalk.
Laser Safety and IEC 825
Using the MAX3869 laser driver alone does not ensure
that a transmitter design is compliant with IEC 825. The
entire transmitter circuit and component selections must
be considered. Each customer must determine the level
of fault tolerance required by their application, recogniz-
ing that Maxim products are not designed or authorized
for use as components in systems intended for surgical
implant into the body, for applications intended to sup-
port or sustain life, or for any other application where the
failure of a Maxim product could create a situation
where personal injury or death may occur.
Chip Information
TRANSISTOR COUNT: 1561
SUBSTRATE CONNECTED TO GND
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX3869.PDF ] | |
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