DS1886

 

Part Number	Replacement	Explanation

Description

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The DS1886 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality for GPON/EPON and 10G PON ONU applications. The combination of the DS1886 with the MAX3710 supports all transmitter and receiver functionality. The DS1886 includes modulation current control and APC set-point control with tracking error adjustment. It continually monitors RSSI for LOS generation. A 13-bit analog-to-digital converter (ADC) monitors V_CC, temperature, laser bias, laser modulation, and receive power to meet all monitoring requirements. Receive power measurement is differential with support for common mode to V_CC. A 9-bit digital-to-analog converter (DAC) is included with temperature compensation for APD bias control.

DS1886: Block Diagram Enlarge+

Key Features

• Meets All SFF-8472 Control and Monitoring Requirements
• Companion Controller for the MAX3710 Laser Driver/Limiting Amplifier and MAX3945 Limiting Amplifier
• MAX3710/DS1886 Combination Supports Broad Spectrum of Continuous Mode and PON Applications Up to 2.5GHz
• Temperature Lookup Table (LUT) to Compensate for APC Tracking Error and Dual Closed-Loop Variables
• Three Laser Control Modes
  • Dual Closed Loop: Laser Bias and Laser Modulation Are Automatically Controlled with Multiple LUTs to Compensate Dual Closed-Loop Calibration Points
  • APC Loop: Laser Bias Automatically Controlled, Laser Modulation Controlled by Temperature LUT
  • Open Loop: Laser Bias and Laser Modulation Are Controlled by Temperature LUTs
• 13-Bit ADC
  • Laser Bias, Laser Power, and Receive Power Support Internal and External Calibration
  • Differential Receive Power Input
  • Scalable Dynamic Range
  • Internal Direct-to-Digital Temperature Sensor
  • Alarm and Warning Flags for All Monitored Channels
• 10-Bit DAC with Temperature Compensation for APD Bias
• Digital I/O Pins: Transmit Disable Input/Output, Rate Select Input/Output, LOS Input/Output, Transmit Fault Input/Output, and IN1 Status Monitor and Fault input
• Comprehensive Fault Measurement System with Maskable Alarm/Warnings
• Flexible Password Scheme Provides Three Levels of Security
• 256-Byte A0h and 128-Byte Upper A2h EEPROM
• I²C-Compatible Interface
• 3-Wire Master to Communicate with the MAX3710/MAX3711 Laser Driver/Limiting Amplifier and MAX3945 Limiting Amplifier

Applications/Uses

• SFF, SFP, and PON ONU Modules