High-bandwidth common-mode filters
The latest common-mode filters from STMicroelectronics have an extremely wide differential bandwidth of 10.7 GHz to protect antenna sensitivity in adjacent wireless circuitry from the latest serial digital interfaces.
The 2-channel ECMF2-40A100N10 and 4-channel ECMF4-40A100N10 are compatible with high-speed interface standards including USB 3.2 Gen 2, USB4, HDMI 2.1, and DisplayPort. With their low serial resistance of just 3 Ω, which minimizes eye-diagram distortion, the filters preserve signal integrity. The filters deliver deep common-mode attenuation (Scc21) from 2.4 GHz to 7 GHz, reaching -21 dB at 5 GHz, and effectively prevent interference with Wi-Fi® and Bluetooth® receivers.
In addition to tackling antenna de-sensitivity issues, the filters can be used for general interface-noise reduction to ensure compliance with electromagnetic compatibility (EMC) regulations. ESD protection up to ±9kV (contact discharge) and ±20kV (air discharge) is also built-in, which exceeds IEC 61000-4-2 level 4.
Both filters are housed in compact micro quad flat no-lead (µQFN) packages only 0.5-mm high and are suited to demanding industrial applications as well as consumer products. They are well suited to protect smart factory equipment, imaging systems, medical devices, laboratory equipment, home-automation systems, set-top boxes, smart televisions, game consoles, notebooks, tablets, and docking stations.
Evaluation boards are available and offer a choice of SMA connector or USB-C connector to provide a convenient connection to test equipment for exploring the filters’ performance.
The ECMF2-40A100N6 in 1.35- x 1.4-mm 6-lead µQFN-6L and ECMF4-40A100N10 in 1.35- x 2.2-mm 10-lead µQFN-10L are in production now.
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