EMC Components: Audio Line Filters With High Attenuation And No Sound Quality Degradation

• Suppression of spurious level of cellular band by up to 50 dB
• World's lowest total harmonic distortion + noise (THD+N) of 0%

TDK Corporation presents the new MAF1005G noise suppression filter, extending its lineup of EMC components for audio lines with three new types measuring just 1.0 mm x 0.5 mm x 0.5 mm. The miniaturized audio line filter features a high attenuation of cellular bands from 700 MHz to 2.5 GHz and can suppress the spurious emissions from these bands by up to 50 dB. Moreover, the new filter limits the THD+N of the audio signals to the world’s lowest levels, just like the MAF1608G, which was introduced in May 2016. As a result, the new MAF1005G filters cause no sound quality degradation in audio lines. Thanks to their small size and excellent attenuation performance, they are suitable for noise suppression in audio lines (earphones, speakers, microphones) of devices such as smartphones, tablets, and portable game consoles.

Based on an optimized product design that utilizes a ferrite material with a low distortion factor, TDK was able to reduce sound quality degradation to a level equal to that of a line without a noise filter. This makes it possible to implement noise protection while still extracting the full performance potential of the audio amplifier. Volume production began in August 2016.

Main applications

• Audio lines (earphones, speakers, microphones) in devices such as smartphones, tablets, and portable game consoles

Main features and benefits

• Excellent attenuation performance for the suppression of spurious emission from the cellular bands
• World's lowest total harmonic distortion + noise (THD+N) of 0%
• Miniature dimensions of 1.0 mm x 0.5 mm x 0.5 mm

Key data

• * at 900 MHz
• ** at 1 kHz, 8 Ω, 1 W

About TDK Corporation

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize ferrite, a key material in electronic and magnetic products. TDK's portfolio includes electronic components, modules and systems* marketed under the product brands TDK and EPCOS, power supplies, magnetic application products as well as energy devices, flash memory application devices, and others. TDK focuses on demanding markets in the areas of information and communication technology and consumer, automotive and industrial electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2016, TDK posted total sales of USD 10.2 billion and employed about 92,000 people worldwide.

* The product portfolio includes ceramic, aluminum electrolytic and film capacitors, ferrites, inductors, high-frequency components such as surface acoustic wave (SAW) filter products and modules, piezo and protection components, and sensors.