|
|
PDF MAX3668EHJ Data sheet ( Hoja de datos )
| Número de pieza | MAX3668EHJ | |
| Descripción | +3.3V / 622Mbps SDH/SONET Laser Driver with Automatic Power Control | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX3668EHJ (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
19-4799; Rev 2; 2/00
+3.3V, 622Mbps SDH/SONET
Laser Driver with Automatic Power Control
General Description
The MAX3668 is a complete, +3.3V laser driver with
automatic power control (APC) circuitry for SDH/SONET
applications up to 622Mbps. It accepts differential
PECL inputs, provides bias and modulation currents,
and operates over a temperature range of -40°C to
+85°C.
An APC feedback loop is incorporated to maintain a
constant average optical power over temperature and
lifetime. The wide modulation current range of 5mA to
75mA and bias current of 1mA to 80mA are easy to
program, making this product ideal for use in various
SDH/SONET applications.
The MAX3668 also provides enable control and a failure-
monitor output to indicate when the APC loop is unable
to maintain the average optical power. The MAX3668 is
available in a 5mm 32-pin TQFP package as well as in
dice.
Applications
622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
Section Regenerators
Features
o Single +3.3V or +5.0V Operation
o 38mA Supply Current at +3.3V
o Programmable Modulation Current from
5mA to 75mA
o Programmable Bias Current from 1mA to 80mA
o Rise/Fall Time <200ps
o Automatic Average Power Control with Failure
Monitor
o Complies with ANSI, ITU, and Bellcore
SONET/SDH Specifications
o Enable Control
Ordering Information
PART
MAX3668EHJ
MAX3668E/D
TEMP. RANGE
-40°C to +85°C
(see Note)
PIN-PACKAGE
32 TQFP (5mm x 5mm)
Dice*
Note: Dice are designed to operate over a -40°C to +140°C
junction temperature (Tj) range, but are tested and guaranteed
at TA = +25°C.
*Contact factory for availability.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
+3.3V
130Ω
MAX3693
4:1
SERIALIZER
WITH
CLOCK GEN
PECL
82Ω
130Ω
DATA+
DATA-
82Ω
MAX3668
+3.3V
VCC
OUT-
OUT+
0.1µF
BIAS
MD
LASER
R-
6.3Ω R+
20Ω
RD
5Ω
CD
1.0µF
RFILT
20Ω
CFILT
5pF
FERRITE
BEAD
CMD
1000pF
†Covered by U.S. Patent numbers 5,802,089 and 5,883,910
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
+3.3V, 622Mbps SDH/SONET
Laser Driver with Automatic Power Control
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
AVAILABLE BIAS CURRENT
vs. MAXIMUM BIAS SET RESISTOR
1000
VCC = +3.3V, + 5V
100
DISTRIBUTION OF MODULATION CURRENT
STABILITY (WORST CASE)
25
TA = -40°C TO +85°C
IMOD = 5mA
20
DISTRIBUTION OF MONITOR DIODE CURRENT
STABILITY (WORST CASE)
25
TA = -40°C TO +85°C
IMD = 18µA
20
10 CLOSED-LOOP OPERATION
15
10
15
10
1 VCC = +5V
VCC = +3.3V
0.1
1.4 1.6 1.8 2.0 2.2 2.4 2.6
RBIAS (kΩ)
5
0
-25 65 155 245 335 425 515
MODULATION DIODE CURRENT STABILITY (ppm/°C)
5
0
-88 -52 20 92 160
MONITOR DIODE CURRENT STABILITY (ppm/°C)
Pin Description
PIN
1, 2, 6, 15,
17, 20, 24
3
4
5, 7, 8, 10,
14, 21, 22, 30
9
11
12, 13, 26,
27, 28
16
18
19
23
25
NAME
VCC
DATA+
DATA-
GND
ENABLE
FAIL
N.C.
BIAS
OUT+
OUT-
MD
CAPC
29 APCSET
31 MODSET
32 BIASMAX
FUNCTION
Positive Supply Voltage
Positive PECL Data Input
Negative PECL Data Input
Ground
TTL/CMOS Enable Input. High for normal operation, low to disable laser bias and modulation
currents. Internally pulled high.
TTL Output. Indicates APC failure when low. Internally pulled high through a 6kΩ resistor.
No Connection. Leave unconnected.
Laser Bias Current Output. Isolate from laser with a ferrite bead.
Positive Modulation Current Output. IMOD flows into this pad when the input signal is high.
Connect this pad to AC coupling network.
Negative Modulation Current Output. IMOD flows into this pad when the input signal is low.
Connect this pad to VCC through a 6.3Ω resistor.
Monitor Photodiode Connection. Connect this pad to the monitor photodiode anode. A capaci-
tor to ground is required to filter high-speed AC monitor photocurrent.
APC Compensation Capacitor. A 0.1µF capacitor connected from this pad to ground controls
the dominant pole of the automatic power control (APC) feedback loop.
APC Set Resistor. A resistor connected from this pad to ground sets the desired average opti-
cal power. The resulting current is equal to the desired DC monitor diode current. Connect a
100kΩ resistor from this pad to ground if APC is not used.
Modulation Set Resistor. A resistor from this pad to ground sets the laser modulation current.
Maximum Bias Set Resistor. A resistor from this pad to ground sets the maximum laser bias
current. The APC function can subtract from this maximum value but cannot add to it. This
resistor controls the bias-current level when the APC loop is not used.
_______________________________________________________________________________________ 5
5 Page 
+3.3V, 622Mbps SDH/SONET
Laser Driver with Automatic Power Control
Package Information
(Package information continues on next page.)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX3668EHJ.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX3668EHJ | +3.3V / 622Mbps SDH/SONET Laser Driver with Automatic Power Control | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |