DS1862A Datasheet, PDF (1/42 Pages) Maxim Integrated Products – XFP Laser Control and Digital Diagnostic IC

Rev 0; 10/08
XFP Laser Control and Digital Diagnostic IC
General Description
The DS1862A is a closed-loop laser-driver control IC
with built-in digital diagnostics designed for XFP MSA.
The laser control function incorporates automatic power
control (APC) and allows extinction ratio control though
a temperature-indexed lookup table (LUT). The
DS1862A monitors up to seven analog inputs, including
temperature and monitor diode (MD) current, which are
used to regulate the laser bias current and extinction
ratio. Warning and alarm thresholds can be pro-
grammed to generate an interrupt if monitored signals
exceed tolerance. Calibration is also provided internally
using independent gain and offset scaling registers for
each of the monitored analog signals. Settings such as
programmed calibration data are stored in password-
protected EEPROM memory. Programming is accom-
plished 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 Lookup 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-Ball CSBGA, 5mm x 5mm Package
♦ Internal or External Temperature Sensor
♦ -40°C to +100°C Operating Temperature Range
♦ One 8-Bit Buffered DAC
Pin Configuration
TOP VIEW
1
2
3
+
A
P-DOWN/ _{SC-RX-LOS SC-RX-LOL}
RST
B
RX-LOS
SCL
FETG
4
THRSET
RSSI
5
V_CC2
MODSET
C
TX-D
SDA
EN1
EN2
BIASSET
D
INTERRUPT MOD-NR AUX1MON AUX2MON BMD
E
GND MOD-DESEL IBIASMON SC-TX-LOS V_CC3
CSBGA (5mm x 5mm)
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS1862AB+
-40°C to +100°C
25 CSBGA
DS1862AB+T&R -40°C to +100°C
25 CSBGA
+Denotes a lead-free/RoHS-compliant package.
T&R = Tape and reel.
Typical Operating Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.