Rainbow-electronics MAX3795 Uživatelský manuál stáhnout pdf

General Description

The MAX3795 is a high-speed VCSEL driver for small-

form-factor (SFF) and small-form-factor pluggable (SFP)

fiber optic transmitters. It contains a bias generator, a

laser modulator, and comprehensive safety features.

The automatic power control (APC) adjusts the laser

bias current to maintain average optical power over

changes in temperature and laser properties. The dri-

ver accommodates common-cathode and differential

configurations.

The MAX3795 operates up to 4.25Gbps. It can switch

up to 15mA of laser modulation current and source up

to 15mA of bias current. Adjustable temperature com-

pensation is provided to keep the optical extinction

ratio within specifications over the operating tempera-

ture range. The MAX3795 interfaces with the Dallas

DS1856/DS1859 to meet SFF-8472 timing and diagnos-

tic requirements. The MAX3795 accommodates various

VCSEL packages, including low-cost TO-46 headers.

The MAX3795 safety circuit detects faults that could

cause hazardous light levels and disables the VCSEL

output. The safety circuits are compliant with SFF and

SFP multisource agreements (MSAs).

The MAX3795 is available in a compact 4mm ✕ 4mm,

24-pin thin QFN package and operates over the -40°C

to +85°C temperature range. The MAX3795 is pin-for-

pin compatible with the MAX3740A and is available in

lead-free packages.

Applications

Multirate (1Gbps to 4.25Gbps) SFP/SFF Modules

Gigabit Ethernet Optical Transmitters

Fibre-Channel Optical Transmitters

Features

♦ Supports All SFF-8472 Digital Diagnostics

♦ 3.3V ±10% Single Supply

♦ 2mA to 15mA Modulation Current

♦ 1mA to 15mA Bias Current

♦ 52ps Transition Time

♦ 8.4ps Deterministic Jitter

♦ Optional Peaking Current to Improve VCSEL Edge

Speed

♦ Supports Common-Cathode and Differential

Configuration

♦ Safety Circuits Compliant with SFF and SFP

MSAs

♦ Pin Compatible to MAX3740A

MAX3795

1Gbps to 4.25Gbps Multirate VCSEL

Driver with Diagnostic Monitors

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3387; Rev 0; 8/04

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.

PART

TEMP RANGE

PIN-PACKAGE

MAX3795ETG

-40°C to +85°C

24 Thi n QFN ( 4m m x 4m m )

MAX3795ETG+

-40°C to +85°C

24 Thi n QFN ( 4m m x 4m m )

PWRMON

REF

COMP

BIASMON

TC1

TC2

GND

MODSET

PEAKSET

EXPOSED PAD IS CONNECTED TO GND

GND

OUT-

OUT+

BIASSET

BIAS

SQUELCH

FAULT

IN-

IN+

TX_DISABLE

GND

MAX3795

THIN QFN (4mm x 4mm)

TOP VIEW

Pin Configuration

+Denotes lead-free package.

1 2 3 4 5 6 ... 14 15

Shrnutí obsahu

Strany 1 - Pin Configuration

General DescriptionThe MAX3795 is a high-speed VCSEL driver for small-form-factor (SFF) and small-form-factor pluggable (SFP)fiber optic transmitters.

Strany 2 - ELECTRICAL CHARACTERISTICS

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors10 ___________________________________________________________________________

Strany 3

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors______________________________________________________________________________

Strany 4

current. For appropriate RTCand RMODSETvalues, seethe Typical Operating Characteristics.Design ProcedureSelect LaserSelect a communications-grade lase

Strany 5

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors______________________________________________________________________________

Strany 6

PART PACKAGE TYPEPACKAGE CODEMAX3795ETG24 Thin QFN(4mm x 4mm x 0.8mm)T2444-1MAX3795ETG+24 Thin QFN(4mm x 4mm x 0.8mm)T2444-1Chip InformationTRANSISTOR

Strany 7

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic MonitorsMaxim cannot assume responsibility for use of any circuitry other than circuit

Strany 8 - Pin Description

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors2 ____________________________________________________________________________

Strany 9 - Detailed Description

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors______________________________________________________________________________

Strany 10 - Modulation Circuit

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors4 ____________________________________________________________________________

Strany 11 - Figure 3. Modulation Circuit

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors______________________________________________________________________________

Strany 12 - Design Procedure

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors6 ____________________________________________________________________________

Strany 13 - Applications Information

MONITOR DIODE CURRENTvs. TEMPERATUREMAX3795 toc18TEMPERATURE (°C)MONITOR DIODE CURRENT (µA)6035-15 10125150175200225250275300100-40 85MAX37951Gbps to

Strany 14 - Functional Diagram

MAX37951Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors8 ____________________________________________________________________________

Strany 15 - Typical Application Circuit

Detailed DescriptionThe MAX3795 contains a bias generator with APC,safety circuit, and a laser modulator with optional peak-ing compensation (see the

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