ASNT5144-KMC

Overview

The ASNT5144-KMC is a SiGe-based automatic frequency doubler designed for high-speed measurement and test equipment. It operates with an input clock frequency range of 4 GHz to 17.5 GHz, producing a doubled output frequency from 8 GHz to 35 GHz. The device features fully differential CML interfaces with internal 50 Ohm termination and delivers a 600 mV single-ended swing. Power consumption is 660 mW under a single +3.3V or -3.3V supply. Key functional attributes include automatic output duty cycle correction to maintain approximately 50% symmetry via internal feedback loops, low jitter performance (1 ps peak-to-peak), and manual tuning capabilities.

Feature Summary

• Automatic output duty cycle correction maintains ~50% symmetry when feedback loops are active.
• Broadband frequency multiplication covering 8 GHz to 35 GHz output range.
• Fully differential CML I/O with integrated 50 Ohm termination for simplified interfacing.
• Configurable feedback control via onfb and crl ports to optimize performance across frequency bands.

Applications

• High-speed measurement and test equipment
• Clock signal generation in broadband systems
• Proof-of-concept prototyping for RF circuits

Procurement Notes

Verify the specific package configuration and pinout compatibility before integration, as the part utilizes a custom 24-pin CQFP package with a center heat slug. Confirm that the PCB layout supports the required power supply polarity (positive or negative) and AC/DC coupling modes specified in the datasheet. Ensure thermal management strategies account for the 660 mW power dissipation and junction temperature limits.

Selection Notes

Select this component when a broadband frequency doubler with automatic duty cycle correction is required for signals up to 17.5 GHz input. The choice depends on the need for differential CML signaling and the ability to configure feedback loops for specific frequency ranges using the crl and onfb control pins. Consider the custom CQFP package constraints and thermal requirements during the design phase.

Part Context

The ASNT5144-KMC belongs to the ASNT5144 family of SiGe ICs manufactured by Advanced Science And Novel Technology Company, Inc. The suffix 'KMC' denotes the specific 24-pin CQFP package type and pinout configuration. This device is engineered for high performance and reliability in industrial temperature ranges, leveraging SiGe technology for superior yield and speed characteristics compared to standard CMOS alternatives.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other ADSANTEC frequency multipliers or comparable SiGe MMICs based on input/output frequency ranges and interface compatibility.

FAQ

How is the output duty cycle controlled?

The output duty cycle can be automatically maintained at approximately 50% by activating the internal feedback loop via the onfb port. Alternatively, manual adjustment is possible via the icntp/icntn tuning ports when feedback is disabled.

What are the valid frequency ranges for different crl settings?

The crl control port adjusts the operational frequency range: vee enables 4.3–12.9 GHz, vcc enables 6.6–19.7 GHz, and not connected (nc) enables 13–38.9 GHz.

Can the device operate with a positive power supply?

Yes, the device supports both negative supply (vee = -3.3V) and positive supply (vcc = +3.3V). When using a positive supply, all I/Os require AC termination if connected to devices with 50 Ohm termination to ground.