DS1873 具有模拟LDD接口的SFP+控制器

DS1873 具有模拟LDD接口的SFP+控制器

概述

The DS1873 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality. The DS1873 provides APC loop, modulation current control, and eye safety functionality. The DS1873 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 V_CC, 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 V_CC. Two digital-to-analog (DAC) outputs with temperature-indexed lookup tables (LUTs) are available for additional monitoring and control functionality.

关键特性

Meets All SFF-8472 Control and Monitoring Requirements

Six Analog Monitor Channels: Temperature, V_CC, 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

Four 10-Bit Delta-Sigma Outputs with 36 Entry Temperature LUTs

• Laser Bias Controlled by APC Loop and Temperature LUT to Compensate for Tracking Error
• Laser Modulation Controlled by 72-Entry Temperature LUT
• Two Additional DACs Controlled by One 72-Entry and One 36-Entry Temperature LUT

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

120 Bytes of Password-1 Protected Memory

128 Bytes of Password-2 Protected Memory in Main Device Address

256 Additional Bytes Located at A0h Slave Address

I²C-Compatible Interface

+2.85V to +3.9V Operating Voltage Range

28-Pin TQFN (5mm x 5mm) Package

应用/使用

SFF、SFP和SPF+收发模块

典型工作电路