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.
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 |