2.4 GHz to 4 GHz, Tunable Low-Pass Filter

The HMC881A is a monolithic microwave integrated circuit (MMIC) low-pass filter that features a user-selectable cutoff frequency. The cutoff frequency can be varied from 2.4 GHz to 4 GHz by applying a single analog tuning voltage between 0 V and 14 V. This low-pass filter provides a low 3 dB insertion loss, 16.5 dB return loss, and 1.35 × f3dB stopband attenuation of >20 dB. This tunable filter can be used as a much smaller alternative to physically large switched filter banks and cavity tuned filters. The HMC881A has excellent microphonics due to the monolithic design, and provides a dynamically adjustable solution in advanced communications applications. The low-pass tunable filter is packaged in a RoHS compliant 5 mm × 5 mm LFCSP package.

Applications

* Testing and measurement equipment

* Military radar and electronic warfare/electronic countermeasures (ECMs)

* Satellite communication and space

* Industrial and medical equipment

* Amplitude settling time: 200 ns (typical)* Wideband rejection: ≥35 dB* Single-chip replacement for mechanically tuned designs* RoHS compliant, 32-lead, 5 mm × 5 mm LFCSP package