HMC940LC4BTR

Clock Buffers, Drivers Overview

The HMC940LC4BTR is a high-speed 1:4 fanout buffer designed for data transmission rates up to 13 Gbps and clock frequencies as high as 13 GHz. It features differential CML inputs and outputs, with all signals DC coupled and internally terminated with 50-ohm resistors to ground. The device operates from a single -3.3V DC supply (range: -3.0V to -3.6V) and consumes approximately 133 mA of current. Key electrical parameters include a propagation delay of 101 ps, rise/fall times of 26/25 ps, and a programmable output voltage swing adjustable between 600 mV and 1400 mV via the VR pin.

Clock Buffers, Drivers Feature Summary

• Supports maximum data rates of 13 Gbps and clock frequencies up to 13 GHz
• Features programmable differential output voltage swing ranging from 600 mV to 1400 mV
• Includes internal 50-ohm termination on both differential inputs and outputs
• Provides low jitter performance with random jitter of 0.2 ps rms and deterministic jitter of 6 ps

Clock Buffers, Drivers Applications

• RF ATE applications
• Broadband test & measurement equipment
• Serial data transmission systems operating up to 13 Gbps
• Clock buffering networks requiring distribution up to 13 GHz

Clock Buffers, Drivers Procurement Notes

Verify component authenticity through authorized Analog Devices channels or certified distributors. Confirm RoHS compliance status and REACH SVHC declarations prior to procurement. Ensure proper ESD handling precautions are observed during storage and assembly due to the device's sensitivity classification.

Clock Buffers, Drivers Selection Notes

Select this component when designing circuits requiring a 1:4 signal distribution ratio at speeds exceeding 10 Gbps. Ensure the power supply provides a stable negative voltage within the -3.0V to -3.6V range. Verify that the PCB layout supports the 24-TFCQFN package dimensions and includes adequate thermal management for the exposed pad to handle 440 mW power dissipation.

Clock Buffers, Drivers Part Context

This part belongs to the HMC940 series of high-speed digital logic components manufactured by Analog Devices Inc. It is specifically engineered for surface-mount technology (SMT) applications in ceramic packages. The TR suffix indicates it is supplied in Tape & Reel packaging format for automated assembly processes.

Clock Buffers, Drivers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative fanout buffers based on matching 13 Gbps speed capabilities, CML interface compatibility, and similar 24-lead QFN package footprints if direct replacement is required.

Clock Buffers, Drivers FAQ

How is the output voltage level controlled?

The output voltage level is controlled via the VR pin. Applying a specific voltage to this pin allows the user to adjust the differential output swing between 600 mV and 1400 mV.

What is the input/output termination configuration?

Both the differential inputs and outputs are DC coupled and feature internal 50-ohm resistors connected to ground for termination.

What are the absolute maximum ratings for the supply voltage?

The absolute maximum rating for the power supply voltage (Vee) is -3.75 V to +0.5 V.