These parameters are common to every RF-ADC in a tile.
- Link Coupling
- This determines if the input signal to the RF-ADC is AC or DC-coupled. Typical applications use AC-coupling, but for certain applications such as Zero IF, DC-coupling is also supported. When DC link coupling mode is selected, the common mode voltage of the external driving circuit needs to be aligned with the RF-ADC internal common mode voltage by using the externally driven VCM pin (see RF-ADC Analog Input)). The VCM pin is only enabled for DC-coupling mode, and can be left floating if AC-coupling mode is chosen.
- Converter Band Mode
- Each RF-ADC can operate either
independently (single band mode) or together with other converters in the tile (multi-band
mode). The following modes are available for the RF-ADC.
- The converter operates in single band mode.
- Multi x2 (pair 01)
- The output from ADC 0 is routed through the DDC channel of both ADC 0 and 1. Digital settings, such as mixer mode and type, are available for each DDC channel. In Quad devices the other two RF-ADCs in the tile operate in single band mode.
- Multi x2 (pair 23)
- This option is similar to the previous mode. Here the output from ADC 2 is routed to DDC channels 2 and 3. The other converters in the tile operate in single band mode. This option is only available on Quad devices.
- Multi x2 (both)
- A combination of the previous multi-band options. The data from ADC 0 provides the input for DDC channels 0 and 1. The data from ADC 2 supplies DDC channels 2 and 3. This option is only available on Quad devices.
- Multi x4
- All DDC channels in the tile are supplied from ADC 0. This option is only available on Quad devices.
- Multi Tile Sync
- When enabled, the tile is included in a multi-tile synchronization group. RF-ADC Tile 0 must be enabled and present in the group along with converter 0 of the tile being configured to enable this option. See Multi-Tile Synchronization for details.