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PDF MAX3867 Data sheet ( Hoja de datos )
| Número de pieza | MAX3867 | |
| Descripción | +3.3V / 2.5Gbps SDH/SONET Laser Driver with Automatic Power Control | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX3867 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-4769; Rev 0a; 9/98
EVAALVUAAILTAIOBNLEKIT
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Automatic Power Control
General Description
The MAX3867 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. The synchronizing input latch can be bypassed if
a clock signal is not available.
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 MAX3867 also provides enable control, a program-
mable slow-start circuit to set the laser turn-on delay,
and a failure-monitor output to indicate when the APC
loop is unable to maintain the average optical power.
The MAX3867 is available in a small 48-pin TQFP pack-
age 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 62mA Supply Current at +3.3V
o Programmable Modulation Current from
5mA to 60mA
o Programmable Bias Current from 1mA to 100mA
o Rise/Fall Time < 90ps
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
MAX3867ECM
-40°C to +85°C 48 TQFP
MAX3867E/D
-40°C to +85°C Dice*
*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 Operating 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+ MAX3867
CLK-
25Ω
OUT-
OUT+
BIAS
MD
*FERRITE
BEAD
LD
20Ω
0.056µF
1000pF
________________________________________________________________ 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 Automatic Power Control
Typical Operating Characteristics
(VCC = +3.3V, load as shown in Figure 2, TA = +25°C, unless otherwise noted.)
EYE DIAGRAM
(2.488Gbps, 1300nm FP LASER,
1.87GHz FILTER, 48-TQFP)
50ps/div
TYPICAL DISTRIBUTION OF FALL TIME
60
50
48-TQFP
IMOD = 30mA
40
30
20 MEAN = 88ps
σ = 3.0ps
10
0
80 84 88 92 96 100
FALL TIME (ps)
DISTRIBUTION OF FALL TIME
(WORST-CASE CONDITIONS)
40
48-TQFP
35 IMOD = 30mA
VCC = +3.14V
30 TA = +85°C
25
20
15 MEAN = 111.6ps
10 σ = 2.9ps
5
0
106 108 110 112 114 116 118 120 122
FALL TIME (ps)
26mV
/div
120
100
80
60
40
20
0
1
ELECTRICAL EYE DIAGRAM
ELECTRICAL EYE DIAGRAM
RANDOM JITTER vs. IMOD
0.022
PATTERN = 213 - 1 + 80 CID
IMOD = 30mA
48-TQFP
55mV
/div
PATTERN = 213 - 1 + 80 CID
IMOD = 60mA
48-TQFP
0.020
0.018
0.016
0.014
50ps/div
50ps/div
0.012
JITTER BW = 12kHz to 20MHz
1-0 PATTERN
0.010
4
11 18 25 32 39 46 53 60
IMOD (mA)
IBIASMAX vs. RBIASMAX
10
RBIASMAX (kΩ)
100
300
100
90
80
70
60
50
40
30
20
10
0
1
IMOD vs. RMODSET
10
RMODSET (kΩ)
100
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
_______________________________________________________________________________________ 5
5 Page 
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Automatic Power Control
Modulation Current More than 60mA
At +5V power supply, the headroom voltage for the
MAX3867 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 MAX3867 can also be DC-cou-
pled to a laser diode when operating at +5V supply; the
voltage at OUT+ should be ≥ 2.0V for proper operation.
Wire Bonding Die
For high current density and reliable operation, the
MAX3867 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) mils.
Layout Considerations
To minimize inductance, keep the connections between
the MAX3867 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 MAX3867 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.
TOP VIEW
Pin Configuration
48 47 46 45 44 43 42 41 40 39 38 37
GND2 1
GND1 2
VCC1 3
DATA+ 4
DATA- 5
VCC1 6
GND1 7
VCC1 8
CLK+ 9
CLK- 10
VCC1 11
GND1 12
MAX3867
36 GND3
35 MD
34 GND3
33 GND4
32 VCC4
31 N.C.
30 OUT-
29 OUT+
28 N.C.
27 VCC4
26 N.C.
25 BIAS
13 14 15 16 17 18 19 20 21 22 23 24
TQFP
GND1
LATCH
ENABLE
GND1
GND1
SLWSTRT
VCC1
FAIL
GND4
N.C.
APCFILT
GND4
VCC4
BIAS
Chip Topography
CLK- VCC1 VCC1 DATA+ GND1
VCC1 CLK+ GND1 DATA- VCC1
GND2
VCC2
BIASMAX
MODSET
GND2
APCSET
N.C. 0.083"
GND2 (2.108mm)
N.C.
GND3
N.C.
CAPC
VCC3
GND3
N.C. N.C. OUT- VCCA GND3
VCC4 OUT+ N.C. GND4 MD
0.070"
(1.778mm)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX3867.PDF ] | |
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