DS1861E Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Full Laser Control with Fault Management

Rev 0; 5/05
Full Laser Control with Fault Management
General Description
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 I²C-compatible interface, which can
also be used to read diagnostic information.
Optical Transceivers
Optical Transponders
Applications
Pin Configuration appears at end of data sheet.
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
♦ I²C-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
Ordering Information
PART
TEMP RANGE
DS1861E
-40°C to +95°C
DS1861E+
-40°C to +95°C
+Denotes lead free.
PIN-PACKAGE
14 TSSOP (173 mils)
14 TSSOP (173 mils)
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
BMD
I_BMD
MAX3736
LASER DRIVER
BIAS
OUT
MOD
BIAS
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.