The audio lines in smartphones, portable digital players, and similar devices emit electromagnetic noise, which can interfere with built-in antennas and degrade reception quality. This noise can be problematic, especially when high-quality audio and effective noise suppression are required. Chip beads are commonly used to control noise in audio lines. However, although they effectively reduce noise, they can also distort the audio quality, impacting the sound in these lines.
With support for wide frequency bandpass, extending from the FM band to the cellular band, these noise suppression filters are particularly well-suited for projects where high sound quality is crucial. These new components control sound distortions with only minimal reductions in volume, thanks to their low resistance.
The new MAF1005FR series of noise suppression filters can improve sound quality and reduce noise interference, with a typical impedance of up to 2600 Ω at 900MHz and insertion loss of more than 25dB. This is achieved by newly developed low-distortion ferrite materials. As a result, the sound quality is maintained, and the issue of sound deterioration caused by chip beads is addressed.
Unlike conventional products, which require two noise suppression filters for each frequency range, only one MAF1005FR component is required. This simplifies the design and implementation of noise suppression in electronic devices. The noise suppression filters are extremely compact, and an operating temperature range of -55 °C to +125 °C is supported.
TDK plans to expand its product lineup to include smaller components for high-frequency bandpass noise control, ranging from 900MHz to 5GHz. The company will also continue to provide products for applications requiring large current support, such as speakers, to meet market demands.
Product designers should consider this new series of noise suppression filters for any audio application that involves RF circuits, including wireless headphones, microphones, and speakers. Product datasheet available here.
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