The FMC DAC 250MSPS 16b 4CH is a single width mezzanine card (69 x 76.5mm) that has been specifically designed to be plugged on the VXS DSP FMC Carrier card but other carriers may also be used. The mezzanine card is using a High Pin Count (HPC) connector that provides up to 400 pins, from which 160, are used definable. The stack height of the connector is 8.5mm. Therefore, the mezzanine card also needs a carrier with a HPC connector and the clock signal for the mezzanine should be provided by the carrier. The mezzanine card is designed according to a VITA57.1 FPGA Mezzanine Card (FMC) standard that sets the specifications for the electromechanical aspects of the mezzanine card. For more information, see FMC standard.

The FMC DAC 250MSPS 16b 4CH card receives digital data input from an FPGA. This data is sampled with four digital-to-analog converters that provide four identical analog outputs. These outputs are amplified, filtered with a 40MHz cutoff frequency and four RF-signal outputs of max. 3.8Vpp are provided by the mezzanine card. The 3.8Vpp voltage is the saturation point of the driving amplifier. In addition, the board has a Serial Peripheral Interface (SPI) for D/A-converter and A/D-converter control; an Inter-Integrated Circuit (I2C) bus that connects devices such as a voltage/temperature monitoring chip, a 64-bit identification number chip, I2C-to-1-wire bridge, an EEPROM memory and a front panel LED controller chip.

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