DS1874

LAST TIME BUY

SFP+ Controller with Digital LDD Interface

Combination of DS1874 and MAX3798/MAX3799 Provides APC Loop, Current Control, and Complete SFF-8472 Functionality

Data Sheet (Rev. 0) Product Selection Table
Viewing:

Overview

  • Meets All SFF-8472 Control and Monitoring Requirements
  • Laser Bias Controlled by APC Loop and Temperature LUT to Compensate for Tracking Error
  • Laser Modulation Controlled by Temperature LUT
  • Six Analog Monitor Channels: Temperature, VCC, MON1–MON4
    • MON1–MON4 Support Internal and External Calibration
    • Scalable Dynamic Range
    • Internal Direct-to-Digital Temperature Sensor
    • Alarm and Warning Flags for All Monitored Channels
  • Two 9-Bit Delta-Sigma Outputs with 36 Entry Temperature LUTs
  • Digital I/O Pins: Five Inputs, Five Outputs
  • Comprehensive Fault-Measurement System with Maskable Laser Shutdown Capability
  • Flexible, Two-Level Password Scheme Provides Three Levels of Security
  • 256 Additional Bytes Located at A0h Slave Address
  • I²C-Compatible Interface
  • 3-Wire Master to Communicate with the MAX3798/MAX3799 Laser Driver/Limiting Amplifier
  • +2.85V to +3.9V Operating Voltage Range
  • -40°C to +95°C Operating Temperature Range
  • 28-Pin TQFN (5mm x 5mm) Package

The DS1874 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality. The combination of the DS1874 with the MAX3798/MAX3799 laser driver/limiting amplifier provides APC loop, modulation current control, and eye safety functionality. The DS1874 continuously monitors for high output current, high bias current, and low and high transmit power to ensure that laser shutdown for eye safety requirements are met without adding external components. Six ADC channels monitor VCC, temperature, and four external monitor inputs (MON1–MON4) that can be used to meet all monitoring requirements. MON3 is differential with support for common mode to VCC. Two digital-to-analog (DAC) outputs with temperature-indexed lookup tables (LUTs) are available for additional monitoring and control functionality.

Applications

  • SFF, SFP, and SFP+ Transceiver Modules
DS1874
SFP+ Controller with Digital LDD Interface
DS1874: Typical Operating Circuit
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Hardware Ecosystem

Parts Product Life Cycle Description
ADC/DAC Combo Converters 1
DS1873
LAST TIME BUY SFP+ Controller with Analog LDD Interface
Analog to Digital Converters (ADCs) 1
DS1856
NOT RECOMMENDED FOR NEW DESIGNS Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection
Interface Transceivers & Isolators 1
MAX3798
NOT RECOMMENDED FOR NEW DESIGNS 1.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver
Modal heading
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project

Latest Discussions

No discussions on DS1874 yet. Have something to say?

Start a Discussion on EngineerZone®

Recently Viewed