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參數(shù)資料
| 型號： | SML2120N |
| 廠商： | Summit Microelectronics, Inc. |
| 英文描述： | Programmable Adaptive Laser Power Controller with Dual Lookup Tables |
| 中文描述： | 可編程控制器自適應激光功率雙查找表 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大小： | 1196K |
| 代理商： | SML2120N |
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Programmable Adaptive Laser Power Controller with Dual Lookup Tables
Preliminary Information
1
(See Last Page)
SUMMIT
Microelectronics, Inc. 2004 1717 Fox Drive San Jose CA 95131-2312 Phone 408 436-9890 Fax 408 436-9897 www.summitmicro.com
2066 6.3 1/22/04
1
SML2120
–
FEATURES AND APPLICATIONS
Features:
Integrated Automatic Power Control (APC) circuit
100 mA bias current sink capability
Dual low-current outputs (up to 2.5 mA) based on two
independent 256x8 Lookup Table values
Bias current and/or temperature monitoring capability
Dual high/low alert registers
Advanced lookup algorithm eliminates unnecessary
output changes
Flexible voltage operation;
0 to 5V, 0 to 3.3V, or -5.2V to +3.3V
I
2
C 2-wire serial bus interface for programming
configuration, control values, monitoring, and
operational status - 100KHz and 400KHz
Small 5X5 28-Pin QFN Package
Applications
:
Laser power management for Telecom/Datacom
motherboards
Direct modulation and electro-absorptive modulation
applications
–
INTRODUCTION
The SML2120 is an advanced, programmable laser diode
power controller ideal for optical networking applications.
The integrated automatic power control (APC) circuit adapts
to variations in the laser’s power output as detected by a
photo diode.
The SML2120 drives two low current outputs derived from
values stored in independent 256x8 Lookup Tables. The low
current outputs are suitable for controlling the MODSET
input of typical laser driver IC’s. The input stimulus for each
Lookup Table can be configured as the laser temperature,
the bias current, or an external signal. Characteristics of the
laser’s performance over time and temperature are stored
in the lookup tables, allowing the outputs to adapt to system
conditions and optimize overall performance.
Programming of configuration and control values by the
user are simplified with the I
2
C interface adapter
(SMX3200) and Windows Programming software available
from Summit Microelectronics.
–
SIMPLIFIED APPLICATION DRAWING
Figure 1. Typical SML2120 Connections to a Laser Driver and Laser Diode
Note: This is an applications example only. Some pins, components and values are not shown.
SML2120
V
DD
(+3.3V)
ILU1
THERMISTOR
14
11
20
18
BIAS
MPD
16
17
C1
C2
13
1
2
9
V
15
24
25
VDD
VHI
+3.3V
8
V
E
1
2
3
4
5
A1
A2
SDA
SCL
6
7
AM#
ALERT#
A
DATA–
DATA+
MODSET
BIASMAX
APCSET
CAPC
V
DD
OUT–
OUT+
N
Typical
Laser Driver
Typical Laser
Diode with
Photo Diode
and Thermistor
ILU0
C
INT
R
INT
12
VBRIDGE
NTC
LD
MPD
VDD
V
V
EXT_TEMP
23
2
V
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