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DS1874：SFP+ Controller with Digital LDD Interface

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

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.

Key Features 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

DS1874: Typical Operating Circuit Applications/Uses SFF, SFP, and SFP+ Transceiver Modules

DataSheet

Parametrics

Design kits & evaluation modules

• DS1874K

Quality and Environmental Data

• DS1874.pdf

Related Products

• DS1873：SFP+ Controller with Analog LDD Interface
• MAX3798：1.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver
• DS1856：Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection

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