Overview

The HXT44121-1 is a single-channel, low-power, linear PAM4 Directly Modulated Laser (DML) driver with differential output and anti-reflection buffer design for LR applications. It supports signaling rates up to 56Gbps PAM4. In conjunction with a DML, the HXT44121-1 provides complete electrical-to-optical conversion, CML input with equalization, laser bias and modulations, laser power control, and various supervision.

The HXT44121-1 integrates several functions required for Automatic Power Control (APC), as well as internal and module temperature measurements and reporting. With an additional RSSI input, the user can directly measure the module receive optical power and report it. The device is designed as an AC-coupled packaged driver to work with TO-CAN or TOSA type of DML lasers.

HXT44121-1 - Block Diagram
HXT44121-1 - Block Diagram
  • 310mW power dissipation per channel
  • Supports up to: IMOD = 50mAPP and IBIAS = 120mA with VCC = 3.3V
  • Integrated 12-bit ADC with 6-channel analog multiplexer front-end
  • Programmable 8-bit laser modulation bias (average) current controls
  • Integrated bias monitor, transmit and receive power monitor capability
  • Automatic power control (APC)
  • Programmable input LOS and Squelch function with disable, transmit disable, and transmit fault indication
  • Programmable input CTLE
  • Integrated temperature sensor and input for external module temperature sensor
  • Interrupts with user-selectable mask control
  • Input polarity inversion
  • Laser disable for IMOD and IBIAS
  • Integrated OTP for calibration
  • 2-wire interface control

Documentation

= Featured Documentation
Type Title Date
Datasheet - Short-form
HXT44121-1 Short-Form Datasheet
PDF 109 KB
Datasheet
HXT44121-1 Preliminary Datasheet
Log in to Download PDF 1.47 MB
2 items

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

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    HXT44121-1-CLJ
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