Digital Data Format - 2.6 English

Zynq UltraScale+ RFSoC RF Data Converter Gen 1/2/3/DFE LogiCORE IP Product Guide (PG269)

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2.6 English

Each word interface to the RF-DAC and RF-ADC is 16 bits wide, even though the RF-DAC resolution is 14 bits and the RF-ADC 12 bits. The word is in twos complement format, giving the range shown in the following table.

The RF-ADC and RF-DAC hex values are displayed appropriately left shifted to align to the input most significant bit.

Table 1. RF-ADC and RF-DAC Word Interface
  AXI4-Stream I/F RF-ADC Resolution (<<4) RF-DAC Resolution (<<2)
Hex Dec Hex Dec Hex Dec
Max positive 0x7FFF 32767 0x7FF0 2047 0x7FFC 8191
0x0001 1 0x0010 1 0x0004 1
Zero 0x0000 0 0x0000 0 0x0000 0
0xFFFF -1 0xFFF0 -1 0xFFFC -1
Min negative 0x8000 -32768 0x8000 -2048 0x8000 -8192