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SFP Laser Controller and Diagnostic IC

Product Details

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.

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
Parametric specs for Fiber Monitoring and Control
ADCs 5-Input Muxable
Resolution (bits) 8
# DACs/ Resistors 2 DACs
Temp. Sensor Internal
Memory EEPROM
VSUPPLY (V) 5
Control Interface I2C
Package/Pins TQFN/28
Budgetary
Price (See Notes)
$3.02 @1k
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Simplified Block Diagram

DS1864: Typical Operating Circuit DS1864: Typical Operating Circuit Zoom icon

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Parameters

Parametric specs for Fiber Monitoring and Control
ADCs 5-Input Muxable
Resolution (bits) 8
# DACs/ Resistors 2 DACs
Temp. Sensor Internal
Memory EEPROM
VSUPPLY (V) 5
Control Interface I2C
Package/Pins TQFN/28
Budgetary
Price (See Notes)
$3.02 @1k

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

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.

Simplified Block Diagram

DS1864: Typical Operating Circuit DS1864: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal