DS1864

SFP Laser Controller and Diagnostic IC


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Description

The DS1864 is an SFF-8472 multisource agreement (MSA)-compliant laser controller/monitor that is ideal for SFP optical-transceiver module designs. It controls laser driver bias and modulation currents through a pair of temperature-controlled current-sink DACs. System diagnostics are provided by monitoring three analog inputs, VCC, and temperature through the internal temperature sensor. The device also contains all EEPROM required by the SFF-8472 MSA, including all A0h and A2h EEPROM. The DS1864's memory map can be configured to be compatible with both the DS1852/DS1856 and the DS1859 memory maps. Additionally, memory is secured with customer-configurable two-level password protection.

Eye-safety features are integrated by three fast-trip comparators that monitor transmit-power high, transmit-power low, and bias current. The fast-trip comparators drive a FET driver output to disable the laser in the case of eye safety violation.

With its integrated laser driver control, system diagnostics, eye-safety features, and internal temperature sensor, the DS1864 provides an ideal solution for SFP optical transceiver modules by improving system performance, reducing board space, and simplifying design.
DS1864: Typical Operating Circuit DS1864: Typical Operating Circuit Enlarge+

Key Features

  • SFF-8472 MSA Compatible
  • Five Monitored Channels (Temperature, VCC, MON1, MON2, MON3)
    • Three External Analog Inputs (MON1, MON2, MON3) Support Internal and External Calibration
    • Enhanced RSSI Monitoring (26dB Range, 0.5dB Accuracy)
    • Scalable Dynamic Range for External Analog Inputs
    • Internal Direct-to-Digital Temperature Sensor Alarm and Warning Flags for All Monitored Channels
  • Two Linear 8-Bit Current-Sink DACs
    • Two User-Selectable Full-Scale Ranges (0.5mA or 1.5mA)
    • Values Changeable Every 2°C
  • Three Fast-Trip Comparators (Tx Power High, Tx Power Low, and Bias Current) for Eye Safety
  • Flexible, Two Level Password Scheme Provides Three Levels of Security
  • Provides All Optional and Required SFF-8472 MSA EEPROM (Both A0h and A2h Memory)
  • I²C-Compatible Serial Interface
  • Operates from a 3.3V or 5V Supply
  • -40°C to +95°C Operating Temperature Range
  • 28-Pin TQFN Package (5mm x 5mm)

Applications/Uses

  • Laser Control and Monitoring
  • SFP Optical Transceiver Modules

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.
Product Reliability Reports: DS1864.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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