56Gb/s PAM4 DML Driver
Jump to Page Section:
Overview
Description
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 the complete electrical-to-optical conversion, CML input with equalization, laser bias and modulations, laser power control, and various supervision.
The HXT44121-1 integrates a number of 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.
Features
- 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 multiplexor 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
Design & Development
Models
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.
Product Options
Processing table
| WAFER | E | WFP | Get Samples, | |
| BOARD | C | Box |
Tips for Using This Parametric Table:
- Hide Filters button in header: Collapse or expands filters
- Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
- Reset button in header: Reset all filters to the page default
- Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
- Export button in header: Export the filtered results of the table to an Excel document
- Filter parts search bar in header: Type to filter table results by part number
- Hide column button in column headers: Select to hide columns in table
- AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
- Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
- Document icon next to product name in row: View the featured document for this product
- Chip icon next to the right of the document icon in row: View the block diagram for this product
- Cart icon to the right of the chip icon: Indicates that samples are available for this product