Perreaux SXD2 owner manual

High

Resolution

Formats

PCB Layout

Localised

Supply

Filtering

Balanced I-V Conversion

Accepting PCM digital streams up to 192kHz and 24-bit, via the coaxial SPDIF input, allows the SXD2 to be compatible with high-resolution formats such as DVD-A.

Special attention has been paid to the PCB layout to ensure maximum isolation between the analog and digital stages. Ground planes and earth returns have been meticulously designed to provide optimal current paths, so as not to interfere with the delicate analog section. Careful layout of the analog output guarantees that crosstalk is kept to an absolute minimum.

All integrated circuits (ICs), both analog and digital, have localised inductor-based supply filtering. Even though voltage regulators are used for all supply rails, they can be susceptible to picking up noise on their way to the ICs, especially with high frequency clocking and data lines present. By filtering locally, we are making absolutely certain that every last ounce of noise is removed from the supply rails.

Localised filtering, along with meticulous PCB layout, paves the way for the SXD2 to utilise the higher signal-to-noise ratio (SNR) performance offered by 24-bit resolution.

Balanced current to voltage conversion is utilised in the audio output stage. This ensures that any common-mode noise and artefacts are removed before amplification and the analog filter.

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