ASNT5175

Overview

The ASNT5175-PQC is a broadband tunable data and clock phase shifter fabricated in SiGe technology. It provides an adjustable delay of the differential output signal relative to the input, controlled via a wide-band differential tuning port. The device supports DC-17Gbps data rates and DC-14GHz clock frequencies. Key electrical parameters include a power consumption of 610mW at a single +3.3V or -3.3V supply, an output jitter of 1ps peak-to-peak, and a delay adjustment range of 255ps at 13GHz (270ps at 1GHz). It features fully differential CML interfaces with internal 50Ohm termination and is housed in a standard 24-pin QFN package.

Feature Summary

• Broadband operation supporting high-speed data and clock signals up to 17Gbps and 14GHz respectively
• Low jitter performance suitable for precision measurement and test applications
• Wide bandwidth phase adjustment control port enabling precise delay tuning
• Flexible power supply configuration allowing operation with either positive or negative single supplies

Applications

• High-speed measurement and test equipment
• Data/clock signal phase alignment in communication systems
• Variable delay line implementations in broadband circuits

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and pinout configuration. Ensure that the procurement channel provides valid RoHS compliance certificates as specified in the datasheet. Confirm that the component matches the exact part number ASNT5175-PQC to guarantee compatibility with the intended 24-pin QFN footprint and thermal requirements.

Selection Notes

Select this component when a low-jitter, broadband phase shifter is required for differential CML signals. Consider the power supply polarity (+3.3V or -3.3V) early in the design phase, as it dictates the I/O termination strategy. Ensure the PCB layout accommodates the 24-pin QFN package and connects the center heat slug to the appropriate ground or power plane for effective thermal dissipation.

Part Context

The ASNT5175 is part of ADSANTEC's portfolio of high-speed integrated circuits designed for demanding applications. Manufactured using SiGe technology, it offers high performance and reliability. This specific model focuses on variable delay functionality, distinguishing itself from multiplexers or serializers within the same product family by providing continuous phase adjustment rather than data serialization.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Designers should evaluate alternative phase shifters based on matching interface types (CML), speed capabilities (17Gbps/14GHz), and package dimensions if substitution is necessary.

FAQ

How does the power supply configuration affect the I/O termination?

When operating with a positive supply (+3.3V), all I/Os require AC termination when connected to devices with 50 Ohm termination to ground. Different PCB layouts are needed for each power supply combination.

What is the recommended coupling mode for optimal performance?

Differential DC signaling mode is recommended for optimal performance. In AC-coupling mode, the input termination automatically provides the required common mode voltage.

How is the delay adjusted on the ASNT5175?

The delay is controlled through a wide-band differential tuning port (icntp/icntn). The adjustment range varies from 255ps at 13GHz to 270ps at 1GHz depending on the control signal voltage.