August 2016

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.

* As of August 2016, according to TDK data

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

Type

Impedance*
[Ω]
DC resistance
[Ω]
Rated current
[A DC]
THD + N**
[%]

MAF1005GAD152A

1500 typ.

0.55 typ.

4000
MAF1005GAD262A2600 typ.1.0 typ.3500
MAF1005GAD352A3500 typ.1.3 typ.2700

* at 900 MHz
** at 1 kHz, 8 Ω, 1 W

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