Optical
DS1886

DS1886

SFP and PON ONU Controller with Digital LDD Interface

Works with MAX3710 and MAX3711 LDD/Limiting Amp to Implement Extinction Ratio Control


Description

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 VCC, temperature, laser bias, laser modulation, and receive power to meet all monitoring requirements. Receive power measurement is differential with support for common mode to VCC. A 9-bit digital-to-analog converter (DAC) is included with temperature compensation for APD bias control.
DS1886: Block Diagram 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
Part Number ADCs Resolution
(bits)
DACs/ Resistors FS Out
(kΩ)
Steps Temp. Sensor Memory VSUPPLY
(V)
Control Interface Budgetary
Price
See Notes
DS1886  5-Input Muxable 13 2 DACs None None Internal EEPROM 2.85 to 3.9 I2C $1.25 @1k
See All Fiber Monitoring and Control (22)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Quality and Environmental Data

Product Reliability Reports: DS1886.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
 

Related Resources


DS3922
High-Speed Current Mirror and Integrated FETs for DC-DC Controller

  • Supports -32dBm to -5dBm Optical Input Range with ±0.5dB Accuracy
  • 15V to 76V APD Bias
  • High-Voltage Switch FET for Boost DC-DC Converter