The ADRF5440 from Analog Devices Inc. is a fast reflective single-pole, four-throw (SP4T) RF switch designed to operate over a frequency range from 1 GHz to 81 GHz. It has a switching time of about 25 ns and a settling time of 35 ns. A single device can cover both microwave and mmWave frequencies, reducing the need for multiple switches in a system.
The SP4T switch routes one RF input to any of the four outputs while maintaining controlled signal degradation across the band. Control is achieved through standard CMOS/LVTTL-compatible inputs. This is useful in systems where signals need to be redirected between different paths, such as antennas, test ports, or processing blocks.
The ADRF5440 is a reflective switch, meaning unused ports are not internally terminated. This helps reduce insertion loss, but it also means designers need to manage reflections externally using proper terminations and careful layout. The device also specifies no low-frequency spurious signals, which helps maintain clean and predictable signal behavior.
The device’s insertion loss is around 1.9 dB up to 40 GHz, 3.0 dB up to 67 GHz, and 4.0 dB up to 81 GHz. At the same time, it provides isolation of around 39 dB at lower frequencies, dropping to about 20 dB at 81 GHz, which helps prevent signals from leaking into unused paths. These parameters directly affect signal integrity in multi-path systems.
Power consumption is relatively low. The device typically draws 145 µA at +3.3 V and 510 µA at −3.3 V, making it suitable for compact and power-sensitive designs. It can also run on a single 3.3 V supply, although this comes with some performance trade-offs compared to dual-supply operation. It can be powered using either dual supplies or a simplified single-supply configuration, depending on system requirements.
ADRF5440 has a 0.1 dB compression point (P0.1dB) of about 25 dBm and a third-order intercept (IP3) of about 47 dBm, which means it can handle high signal levels with minimal distortion. It supports up to 24 dBm input power, even during “hot switching” (when switching while a signal is present). Together, these values indicate the device can operate reliably in high dynamic range systems without significantly degrading the signal.
Physically, the device is built as a 56-ball flip-chip die measuring about 2.39 mm × 2.54 mm and operates over a temperature range of −40 °C to +105 °C, allowing it to be used in a wide range of environments. All RF ports are matched to 50 Ω impedance, which is the standard for most high-frequency systems.
Overall, the ADRF5440 illustrates the trend toward highly integrated, ultra-wideband RF components that support flexible and compact system architectures. By combining wide frequency coverage, fast switching, and solid RF performance in a small form factor, it is suited to modern applications such as 5G mmWave systems, radar platforms, and broadband test and measurement environments.
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