One of the most important goals in every light source is to achieve orbit stability for the electron beam within the required specifications for the stability of the photon beam in the experimental stations. Several technical challenges make the task of achieving sub-micrometer stability really demanding in terms of mechanical and electrical engineering. Fast feedback systems are employed to dump orbit distortions through accurate measurements of the beam positions, fast computation of the corrections and actuation back to the beam through fast power supplies and steering magnets. To realize this task in the *SIRIUS*http://www.lnls.br, the new brazilian synchrotron light source, a digital platform to measure the beam position is required. Inside this plattaform a key part is the analog to digital conversion. This text will describe the main specification for an FMC Analog-to-digital conversion board.

There are several commercial off-the-shelf digitizers covering a wide range of speed, bandwidth and resolution, but there is no board that cover all features required for the LNLS design.

FMC ADC 130M 16B 4CHA production board* - (Top view, Bottom view, Front view )

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