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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 average power con-

trol (APC) and allows extinction ratio control though a

temperature indexed look-up 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

C*-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

♦ I

C-Compatible Serial Interface

♦ Automatic Power Control (APC)

♦ Extinction Ratio Control with Look-Up 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-Pin CSBGA, 5mm x 5mm Package

♦ Internal or External Temperature Sensor

♦ -40°C to +100°C Operating Temperature Range

♦ One 8-Bit Buffered DAC

DS1862

XFP Laser Control and Digital Diagnostic IC

______________________________________________ Maxim Integrated Products 1

CSBGA (5mm x 5mm)

TOP VIEW

2345

Pin Configuration

Rev 0; 2/06

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.

+Denotes lead-free package.

Ordering Information

Typical Operating Circuit appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

DS1862B

-40°C to +100°C

25 CSBGA (5mm x 5mm)

DS1862B+

-40°C to +100°C

25 CSBGA (5mm x 5mm)

*Purchase of I

C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a

license under the Philips I

C Patent Rights to use these components in an I

C system, provided that the system conforms to the I

Standard Specification as defined by Philips.

1 2 3 4 5 6 ... 41 42

Resumo do Conteúdo

Página 1 - Ordering Information

General DescriptionThe DS1862 is a closed-loop laser-driver control IC withbuilt-in digital diagnostics designed for XFP MSA. Thelaser control functio

Página 2 - ABSOLUTE MAXIMUM RATINGS

DS1862XFP Laser Control and Digital Diagnostic IC10 ____________________________________________________________________FETGP-DOWN/RSTOCCURRENCEOF FAU

Página 3 - DC ELECTRICAL CHARACTERISTICS

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 11READ FLAGSOCCURRENCEOF MONITOR

Página 4 - ANALOG OUTPUT CHARACTERISTICS

DS1862XFP Laser Control and Digital Diagnostic IC12 ____________________________________________________________________Typical Operating Characterist

Página 5

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 13Pin DescriptionNAMEPINDESCRIPT

Página 6 - ANALOG INPUT CHARACTERISTICS

DS1862XFP Laser Control and Digital Diagnostic IC14 ____________________________________________________________________Block DiagramMUXVCC2TX-PLOGICS

Página 7 - FAULT CHARACTERISTICS

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 15Detailed DescriptionThe DS1862

Página 8 - Timing Diagrams

DS1862XFP Laser Control and Digital Diagnostic IC16 ____________________________________________________________________If the largest current range i

Página 9

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 17Monitor ChannelsThe DS1862 has

Página 10 - Timing Diagrams (continued)

DS1862XFP Laser Control and Digital Diagnostic IC18 ____________________________________________________________________fault functionality, current o

Página 11

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 19Internal CalibrationThe DS1862

Página 12

DS1862XFP Laser Control and Digital Diagnostic IC2 _____________________________________________________________________ABSOLUTE MAXIMUM RATINGSRECOMM

Página 13 - Pin Description

DS1862XFP Laser Control and Digital Diagnostic IC20 ____________________________________________________________________/* Assume that the Null input

Página 14 - Block Diagram

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 21Warning and Alarm Logic Based

Página 15 - Detailed Description

DS1862XFP Laser Control and Digital Diagnostic IC22 ____________________________________________________________________Warning and Alarm Logic Based

Página 16

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 23The polarity of the FETG pin c

Página 17 - Monitor Channels

DS1862XFP Laser Control and Digital Diagnostic IC24 ____________________________________________________________________During an asserted period of P

Página 18 - Selection (Unit Selection)

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 25DEC hex00I2C SLAVE ADDRESS A0h

Página 19 - Examples

DS1862XFP Laser Control and Digital Diagnostic IC26 ____________________________________________________________________LOWER MEMORY (00H–7FH)WORD 0 W

Página 20 - (Scalable Dynamic Ranging)

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 27EXPANDED BYTES (CONTINUED)Bit7

Página 21 - , Temp, RX-P

DS1862XFP Laser Control and Digital Diagnostic IC28 ____________________________________________________________________TABLE 01H (SERIAL ID MEMORY)WO

Página 22 - Shutdown Functionality

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 29TABLE 04H (CONTROL AND CONFIG)

Página 23 - Power-Down/Reset Pin

DS1862XFP Laser Control and Digital Diagnostic IC_____________________________________________________________________ 3DC ELECTRICAL CHARACTERISTICS(

Página 24 - DS1862 Memory Map

DS1862XFP Laser Control and Digital Diagnostic IC30 ____________________________________________________________________TABLE 05H (OPTIONAL OFFSETS AN

Página 25 - Table 11. Permission Table

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 31Bit 0: DATA_NOT_READY. Bit is

Página 26

DS1862XFP Laser Control and Digital Diagnostic IC32 ____________________________________________________________________DDh• 6Eh Enable ...

Página 27

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 3385h• APC REF FINE ...

Página 28 - <4>

DS1862XFP Laser Control and Digital Diagnostic IC34 ____________________________________________________________________92hVCC2/3SCALE ...

Página 29

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 35B1h• LUT VALUE ...

Página 30 - Detailed Register Description

DS1862XFP Laser Control and Digital Diagnostic IC36 ____________________________________________________________________Security/Password ProtectionTh

Página 31 - Table 01h

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 37Bit write: Transitions of SDA

Página 32 - Table 04h

DS1862XFP Laser Control and Digital Diagnostic IC38 ____________________________________________________________________The memory address is always t

Página 33

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 39I2C Operation usingPacket Erro

Página 34

DS1862XFP Laser Control and Digital Diagnostic IC4 _____________________________________________________________________I2C AC ELECTRICAL CHARACTERIST

Página 35 - THRSET_Value

DS1862XFP Laser Control and Digital Diagnostic IC40 ____________________________________________________________________CRC-8 includes and requires th

Página 36 - C Serial Interface

DS1862XFP Laser Control and Digital Diagnostic IC____________________________________________________________________ 41Power-Supply DecouplingTo achi

Página 37

DS1862XFP Laser Control and Digital Diagnostic ICMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in

Página 38 - C Communication

DS1862XFP Laser Control and Digital Diagnostic IC_____________________________________________________________________ 5AC ELECTRICAL CHARACTERISICS—X

Página 39 - Packet Error Checking

DS1862XFP Laser Control and Digital Diagnostic IC6 _____________________________________________________________________AC ELECTRICAL CHARACTERISICS—S

Página 40 - Applications Information

DS1862XFP Laser Control and Digital Diagnostic IC_____________________________________________________________________ 7FAST ALARMS AND VCCFAULT CHARA

Página 41 - Typical Operating Circuit

DS1862XFP Laser Control and Digital Diagnostic IC8 _____________________________________________________________________Timing DiagramsVCC > VPOATX

Página 42 - Package Information

DS1862XFP Laser Control and Digital Diagnostic IC_____________________________________________________________________ 9Timing Diagrams (continued)TX-

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