HMC891LP5ETR

Overview

The HMC891LP5ETR is a monolithic microwave integrated circuit (MMIC) bandpass filter manufactured by Analog Devices Inc. It features a user-selectable passband frequency tunable between 2.0 and 3.9 GHz via an analog control voltage ranging from 0 to 14 V. The device provides a 3 dB bandwidth of approximately 9% and a 20 dB bandwidth of approximately 27%. Key electrical specifications include an insertion loss of 7 dB, return loss of 10 dB, and maximum linear input power of 10 dBm. It operates within a temperature range of -40 °C to +85 °C and utilizes a 32-lead 5x5 mm surface mount package.

Feature Summary

• Fast tuning response with a full-band transition time of 200 ns
• Excellent wideband rejection capability exceeding 30 dB
• Single-chip replacement for mechanically tuned designs

Applications

• Test & Measurement Equipment
• Military RADAR & EW/ECM
• SATCOM & Space
• Industrial & Medical Equipment

Procurement Notes

Verify the obsolete status of this component before procurement planning. Confirm that the 'ETR' suffix denotes tape-and-reel packaging compatible with automated assembly lines. Ensure compatibility with existing design infrastructure given the discontinuation notice. Validate supply chain sources for availability as standard distribution channels may no longer stock this specific part number.

Selection Notes

Select this component when a compact, dynamically adjustable filter solution is required to replace bulky switched filter banks or cavity-tuned filters. Consider the 200 ns tuning speed and low residual phase noise (-155 dBc/Hz at 1 MHz offset) for high-performance applications. Verify that the 7 dB insertion loss and 10 dB return loss meet system link budget requirements.

Part Context

This MMIC belongs to the HMC891 series of tunable bandpass filters designed for advanced communications. It serves as a direct functional alternative to physically large mechanical tuning mechanisms. The device integrates frequency and bandwidth control capabilities into a single small form factor, simplifying RF front-end architecture.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status indicated in the datasheet, engineering teams should evaluate newer generation tunable filter families from Analog Devices for long-term production viability.

FAQ

How does the HMC891LP5ETR achieve its fast tuning response?

The device achieves a full-band tuning response of 200 ns, which is dependent on the driver circuit used. Optimal performance requires a low-noise driver circuit capable of handling the specified source/sink current.

What is the relationship between the center frequency and the rejection frequencies?

The low-side rejection frequency (where rejection >20 dB) is approximately 0.88 times the center frequency, while the high-side rejection frequency is approximately 1.15 times the center frequency.

Can external voltage be applied to the RFIN and RFOUT pins?

No. Both the RFIN (Pin 6) and RFOUT (Pin 19) pins are DC coupled and matched to 50 Ohms. External voltage must not be applied to these pins.