DS1862 Datasheet, PDF (1/42 Pages) Maxim Integrated Products – XFP Laser Control and Digital Diagnostic IC

Rev 0; 2/06
XFP Laser Control and Digital Diagnostic IC
General Description
The DS1862 is a closed-loop laser-driver control IC with
built-in digital diagnostics designed for XFP MSA. The
laser control function incorporates average power con-
trol (APC) and allows extinction ratio control though a
temperature indexed look-up table (LUT). The DS1862
monitors up to seven analog inputs, including tempera-
ture and monitor diode (MD) current, which are used to
regulate the laser bias current and extinction ratio.
Warning and alarm thresholds can be programmed to
generate an interrupt if monitored signals exceed toler-
ance. Calibration is also provided internally using inde-
pendent gain and offset scaling registers for each of
the monitored analog signals. Settings such as pro-
grammed calibration data are stored in password-pro-
tected EEPROM memory. Programming is accomplished
through an I²C*-compatible interface, which can also be
used to access diagnostic functionality.
Applications
Laser Control and Monitoring 10Gbps Optical
Transceiver Modules (XFP)
Laser Control and Monitoring
Digital Diagnostics in Optical Transmission
Features
♦ Implements XFP MSA Requirements for Digital
Diagnostics, Serial ID, and User Memory
♦ I²C-Compatible Serial Interface
♦ Automatic Power Control (APC)
♦ Extinction Ratio Control with Look-Up Table
♦ Seven Monitored Channels for Digital Diagnostics
(Five Basic Plus Two Auxiliary)
♦ Internal Calibration of Monitored Channels
(Temp, V_CC2/3, Bias Current, Transmitted, and
Received Power)
♦ Programmable Quick-Trip Logic for Turning
Off Laser for Eye Safety
♦ Access to Monitoring and ID Information
♦ Programmable Alarm and Warning Thresholds
♦ Operates from 3.3V or 5V Supply
♦ 25-Pin CSBGA, 5mm x 5mm Package
♦ Internal or External Temperature Sensor
♦ -40°C to +100°C Operating Temperature Range
♦ One 8-Bit Buffered DAC
TOP VIEW
1
A
B
C
D
E
Pin Configuration
2
3
4
5
Ordering Information
PART
TEMP RANGE
DS1862B
-40°C to +100°C
DS1862B+ -40°C to +100°C
+Denotes lead-free package.
PIN-PACKAGE
25 CSBGA (5mm x 5mm)
25 CSBGA (5mm x 5mm)
CSBGA (5mm x 5mm)
Typical Operating Circuit appears at end of data sheet.
*Purchase of I²C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I²C Patent Rights to use these components in an I²C system, provided that the system conforms to the I²C
Standard Specification as defined by Philips.
______________________________________________ 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.