Eliminate audio cable noise

25 September 2002 Circuit & System Protection

New Murata technology creates three magnetically coupled common mode choke coils in one 2,5 and 2,0 mm chip. It is 1,2 mm high and contains no lead (Pb).

The increase in digital equipment with audio circuits creates the risk of high frequency noise from digital lines being radiated from headphone cables. Developed specifically to control sound crosstalk, distortion and radiated noise in stereo audio signal lines, this chip eliminates these problems.

New ceramic material avoids sound distortion that can be caused by conventional filters in which the impedance may change with the audio signal level. The new material is not sensitive to the signal level so distortion is not a problem (see graph).

Optimal internal and external electrode arrangements give high common and normal mode impedances. These suppress common and normal mode noise that would other-wise be radiated from the headphone cable.

Electrically, the DLM2HGN601S has common mode impedance of 600 Ohm ±25% and typical normal mode of 600 W. Rated current is 100 mA up to 16 V d.c. and DC resistance is 0,40 Ohm maximum. Insulation resistance is 100 MOhm minimum.

For more information contact Avnet Kopp, 011 809 6100, [email protected], www.avnet.co.za

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