QuickView - DS1862A XFP Laser Control and Digital Diagnostic IC

Description

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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 programmed 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 accomplished through an I²C-compatible interface, which can also be used to access diagnostic functionality.

Key Features

Applications/Uses

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

	Digital Diagnostics in Optical Transmission
	Laser Control and Monitoring
	Laser Control and Monitoring 10Gbps Optical Transceiver Modules (XFP)

Key Specifications: Fiber Monitoring and Control

Part Number

Features

ADCs

Resolution
(bits)

DACs/ Resistors

Temp. Sensor

Memory

V_SUPPLY
(V)

Control Interface

Price

See Notes

DS1862A

Alarm Flags

Alarm/Warning Flags

Internal Calibration

Look-Up Table Compensation

Scalable Dynamic Ranging (Right Shifting)

User EEPROM

7-Input Muxable

1 DAC

Internal

EEPROM

3.3

2-Wire

I²C

$2.89 @1k

See All Fiber Monitoring and Control (12)

Diagram

Typical Operating Circuit

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2008-11-04
This page last modified: 2009-07-23