The DS1861 is a laser-driver control IC designed to
reduce the production cost of fiber optics circuits by
eliminating multiple temperature tests. It works with
nearly all laser-driver ICs to provide automatic power
control (APC) and automatic extinction ratio control
(AERC), which improves the performance of the system
over temperature and aging. It also has built-in monitor-
ing capability to provide early fault detection, which can
be configured to latch the IC into a shutdown condition.
Settings programmed into the DS1861 are stored in
password-protected EEPROM memory, which write-
protects calibration data. Programming is accom-
plished through an I
2
C-compatible interface, which can
also be used to read diagnostic information.
Features
♦
Automatic Power Control (APC)
♦
Automatic Extinction Ratio Control (AERC)
Across Temperature and Laser Aging
♦
Works in AC-Coupled Laser Systems
♦
Configurable Latched Automatic Shutdown with
Tx-Fault and Tx-Disable
♦
Programmable Fast Alarm Conditions
♦
I
2
C-Compatible Serial Interface Allows Up to Eight
Devices on the Same Serial Bus
♦
Operates Over Wide Supply-Voltage Range
♦
Nonvolatile Memory for Device Settings
♦
Small, 14-Pin TSSOP Package
♦
-40°C to +95°C Operating Temperature Range
DS1861
Applications
Optical Transceivers
Optical Transponders
PART
DS1861E
DS1861E+
Ordering Information
TEMP RANGE
-40°C to +95°C
-40°C to +95°C
PIN-PACKAGE
14 TSSOP (173 mils)
14 TSSOP (173 mils)
Pin Configuration appears at end of data sheet.
+Denotes
lead free.
Typical Operating Circuit
V
CC
V
CC
V
CC
30kΩ
4.7kΩ
4.7kΩ
4.7kΩ
SCL
SDA
TX-F
TX-D
N.C.
N.C.
A2
A1
A0
GND
V
CC
DS1861
BIASSET
I
BIASSET
MODSET
I
MODSET
MOD
BIAS
MAX3736
LASER DRIVER
OUT
BIAS
BMD
I
BMD
1nF
______________________________________________
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.
Full Laser Control with Fault Management
DS1861
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
, SDA, and SCL
Pins Relative to Ground.....................................-0.5V to +6.0V
Voltage Range on A
0
, A
1
, A
2
, Tx-Fault, Tx-Disable,
BIASSET, MODSET, and BMD Relative to
Ground.................-0.5V to (V
CC
+ 0.5V), not to exceed +6.0V
Operating Temperature Range ...........................-40°C to +95°C
EEPROM Programming Temperature Range .........0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature .......................................See IPC/JEDEC
J-STD-020 Specification
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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