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 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
Applications/Uses
Meets All SFF-8472 Control and Monitoring Requirements
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
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
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