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Datacom module

Optical module

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Block diagram

Optical module

Block diagram

Overview

Integrated circuits and reference designs help you create a smaller and faster optical module design used in high-bandwidth data communication applications. Whether you are creating a 100-Gbps or 400-Gbps, small form-factor pluggable (SFP) module, SFP+ transceiver, XFP module, CFP, X2/XENPAK module or other advanced fiberoptic module, we have the right ingredients to help you deliver what is next in 5G.

Design requirements

Modern optical module designs often require:

  • Reduced power consumption to control and limit module temperature rise.
  • Dynamic and precise control of laser diodes to regulate output power.
  • Accurate photodiode-based light sensing and biasing.
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Block diagram

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Datacom Optical Module

Telecom Optical Module

Datacom Optical Module

3.3V 3.3V RX RX xN xN TX TX xN xN xM xM xM xM Optical (Fiber) Optical (Fiber) Electrical Electrical M = number of optical lanes M = number of optical lanes N = Number of Electrical lanes N = Number of Electrical lanes Power Power DC/DC module DC/DC module Buck converter Buck converter LDO LDO Supervisor/reset Supervisor/reset Protection Protection Load switch Load switch Miscellaneous Miscellaneous Temp sense Temp sense FET FET Switch Switch Measurement feedback Measurement feedback ADC ADC MCU MCU MCU MCU Level translator Level translator Logic Logic I2C level shift I2C level shift SerDes, clock data recovery & laser driver SerDes, clock data recovery & laser driver Clock oscillator Clock oscillator VREF VREF De-serializer De-serializer Serializer Serializer Laser driver Laserdriver FET FET DAC DAC OPA OPA Clock data recovery (CDR) Clock data recovery (CDR) Clock data recovery (CDR) Clock data recovery (CDR) Photo diode bias Photo diode bias Boost or buck-boost Boost or buck-boost INA INA OPA OPA DAC DAC Externally modulated laser electro absorption bias Externally modulated laser electro absorption bias Inverting buck-boost Inverting buck-boost INA INA OPA OPA DAC DAC Transmitter optical sub assembly (TOSA) Transmitter optical sub assembly (TOSA) Laser (EML, DML or VCSEL) Laser(EML, DML or VCSEL) TEC TEC Buck-boost Buck-boost Receiver optical sub assembly (ROSA) Receiver optical sub assembly (ROSA) Photo diode (pin or APD) Photodiode(pin or APD) TIA TIA OPA OPA INA INA Boost Boost

Protection

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Power path protection circuitry for the 3.3V input voltage rails, typically comprised of a 3.3V load switch. Most of the time, power protection is provided from the power source so a load switch is sufficient for the optical module. However, there are some cases where an efuse can be desirable for extra protection.

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Power management (13)
Load switches
  • TPS22997—5.5-V 10-A 4-mΩ on-resistance load switch with power good
    Data sheet: PDF | HTML
  • TPS22811—2.7-V to 16-V, 10-A, 6-mΩ load switch with fast overvoltage protection and current monitoring
    Data sheet: PDF | HTML
  • TPS22964C—5.5-V, 3-A, 14-mΩ load switch with output discharge
    Data sheet: PDF | HTML
  • TPS22990—5.5-V, 10-A, 3.9-mΩ load switch with adj. rise time, power good and optional output discharge
    Data sheet: PDF | HTML
  • TPS22998—5.5-V, 10-A, 4-mΩ On-Resistance load switch
    Data sheet: PDF | HTML
  • TPS22924D—3.6-V, 2-A, 18.3-mΩ load switch with output discharge and rise time of 6200-µs at 3.6-V
    Data sheet: PDF | HTML
eFuses & hot swap controllers
  • TPS25981—2.7-V to 16-V, 10-A, 6-mΩ eFuse with transient overcurrent blanking timer
    Data sheet: PDF | HTML
  • TPS25983—2.7V to 26V, 2.7mΩ 20A integrated hot-swap eFuse with current monitor and blocking FET drive
    Data sheet: PDF | HTML
  • TPS25947—2.7-V to 23-V, 28-mΩ, 5.5-A eFuse with integrated reverse polarity protection
    Data sheet: PDF | HTML
  • TPS25944L—2.7-V to 18-V, 42mΩ, 0.6-5.2A eFuse with reverse current blocking
    Data sheet: PDF | HTML
  • TPS25926—4.5-V to 13.8-V, 30mΩ, 2-5A eFuse
    Data sheet: PDF | HTML
  • TPS2490—9-V to 80-V hot swap controller with power limiting and latch off
    Data sheet: PDF | HTML
USB power switches & charging port controllers
  • TPS2553-1—0.075-1.7A adj. ILIMIT, 2.5-6.5V, 85mΩ USB power switch, active-high, latch-off, reverse blocking
    Data sheet: PDF | HTML

    Technical documentation

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    No results found. Please clear your search and try again.
    Type Title Date
    Application brief DACx1416 Delivers Optimized Solution to Mach Zehnder Modulator Biasing 29 Jun 2018
    White paper Enabling Higher Data Rates for Optical Modules With Small and Efficient Power 23 Mar 2021
    Application note Transimpedance Considerations for High-Speed Operational Amplifiers 20 Nov 2009
    Application note Considerations for PCB Layout and Impedance Matching Design in Optical Modules 14 Feb 2011
    Technical article How to modify a step-down converter to the inverting buck-boost topology PDF | HTML 12 Sep 2023
    Technical article How to quickly prototype your pico display application by selecting the right opti PDF | HTML 03 Oct 2023
    Application brief High-Density DACs Offer Superior Noise And Accuracy for Laser Drive Applications 02 Oct 2018

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