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MAX3795

1Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors

Multirate 1Gbps to 4.25Gbps VCSEL Driver for SFF/SFP Ethernet and Fibre-Channel Applications

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
MAX3795	Active: In Production. See Ordering Information for details.

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 driver 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 compensation is provided to keep the optical extinction ratio within specifications over the operating temperature range. The MAX3795 interfaces with the Dallas DS1856/DS1859 to meet SFF-8472 timing and diagnostic 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 x 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.

Data Sheet

Download	Rev 0	(PDF, 824kB)
E-Mail

An evaluation kit is available: MAX3795EVKIT

Key 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

Applications/Uses

Fibre Channel Optical Transmitters
Gigabit Ethernet Optical Transmitters
Multirate (1Gbps to 4.25Gbps) SFF/SFP Modules

Key Specifications:

Laser Drivers

Part Number

Target Oper. Range
(Gbps)

Data Rate
(Mbps)

V_SUPPLY
(V)

I_CC
(mA)

I/O Type

I_MOD
(mA)

I_BIAS
(mA)

EV Kit

Package/Pins

Budgetary Price

min

max

typ

max

See Notes

MAX3795

1 to 4.5

1000

4250

3.3

CML

Yes

TQFN/24

$5.68 @1k

See All Laser Drivers (24)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Application Circuit

Application Notes

Reference Design 3376		HFRD-15.3: High-Frequency SFP Host Board (Includes Integrated RS-232 to I²C Conversion)
Reference Design 3454		HFRD-14.0: Multirate (1Gbps to 4.25Gbps) 850nm Small Form-Factor Pluggable (SFP) Transceiver
Application Note 3596		MAX3740: The MAX3740/MAX3795 Laser Driver Average Power Monitors (PWRMON)
Application Note 3766		HFTA-12.0: Measuring Crosstalk Penalty in High-Speed Bidirectional Serial Communication Modules
Reference Design 4094		HFRD-30.1: SFP+ Host Board

Reliability Reports

Reliability Report:	MAX3795.pdf
Show FIT data for:

Software/Models

MAX3795ETG IBIS Model

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX3795ETG		N/A	No Longer Available	MAX3740AETG+	TQFN;24 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0021 (PDF) Use pkgcode/variation: T2444-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3795ETG+			Active	MAX3740AETG+	TQFN;24 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0021 (PDF) Use pkgcode/variation: T2444+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3795ETG+T			Active	MAX3740AETG+	TQFN;24 pin;16.8 mm² Outline Drawing:21-0139 (PDF) Land Pattern: 90-0021 (PDF) Use pkgcode/variation: T2444+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3795ETG-T		N/A	No Longer Available	MAX3740AETG+	QFN;24 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Evaluation Kits

MAX3795EVKIT

Evaluation Kit for the MAX3795

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