DS1862B 데이터 시트보기 (PDF) - Maxim Integrated

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DS1862B

XFP Laser Control and Digital Diagnostic IC

Maxim Integrated 

Rev 1; 12/07

XFP Laser Control and Digital Diagnostic IC

General Description

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 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, VCC2/3, 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

4

5

A

P-DOWN/ SC-RX-LOS SC-RX-LOL THRSET

VCC2

RST

B

RX-LOS

SCL

FETG

RSSI MODSET

C

TX-D

SDA

EN1

EN2

BIASSET

D

INTERRUPT MOD-NR AUX1MON AUX2MON BMD

E

GND MOD-DESEL IBIASMON SC-TX-LOS VCC3

CSBGA (5mm x 5mm)

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

DS1862B

-40°C to +100°C

25 CSBGA

DS1862B+

-40°C to +100°C

25 CSBGA

+Denotes a lead-free/RoHS-compliant package.

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.

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