The DS1862 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 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 I
2
C-compatible interface, which can also be
used to access diagnostic functionality.
♦
♦
♦
Features
♦
Implements XFP MSA Requirements for Digital
Diagnostics, Serial ID, and User Memory
I
2
C-Compatible Serial Interface
Automatic Power Control (APC)
Extinction Ratio Control with Lookup Table
DS1862
♦
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
Applications
Laser Control and Monitoring 10Gbps Optical
Transceiver Modules (XFP)
Laser Control and Monitoring
Digital Diagnostics in Optical Transmission
Pin Configuration
PART
TOP VIEW
1
2
3
4
5
Ordering Information
TEMP RANGE
-40°C to +100°C
-40°C to +100°C
PIN-PACKAGE
25 CSBGA
25 CSBGA
DS1862B
DS1862B+
A
P-DOWN/
RST
B
RX-LOS
C
TX-D
D
INTERRUPT
E
GND
MOD-DESEL IBIASMON SC-TX-LOS
V
CC3
MOD-NR
AUX1MON
AUX2MON
BMD
SDA
EN1
EN2
BIASSET
SCL
FETG
RSSI
MODSET
SC-RX-LOS SC-RX-LOL
THRSET
V
CC2
+Denotes
a lead-free/RoHS-compliant package.
CSBGA (5mm x 5mm)
Typical Operating Circuit appears at end of data sheet.
______________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
XFP Laser Control and Digital Diagnostic IC
DS1862
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Open-Drain Pin
Relative to Ground.............................................-0.5V to +6.0V
Voltage Range on MOD-DESEL, SDA, SCL,
FETG, THRSET, TX-D, AUX1MON, AUX2MON,
IBIASMON, RSSI, BIASSET, MODSET,
EN1, EN2............................................-0.5V to (VCC3 + 0.5V)*
Voltage Range on SC-RX-LOS,
SC-RX-LOL, RX-LOS, SC-TX-LOS,
MOD-NR, EN1, EN2 ...........................-0.5V to (VCC2 + 0.5V)*
Operating Temperature Range .........................-40°C to +100°C
EEPROM Programming Temperature Range .........0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...........................Refer to the IPC JEDEC
J-STD-020 Specification.
*Not
to exceed +6.0V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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