Power Regulation and Decoupling for ADC and DAC Supplies

UltraScale Architecture PCB Design User Guide (UG583)

Document ID
UG583
Release Date
2023-11-14
Revision
1.27 English

AMD supports powering the RFDC analog Supplies from either low dropout (LDO) or higher efficiency switched mode regulator solutions that meet the ripple requirements. A typical LDO based power distribution is shown in This Figure. Later sections deal with powering off switched mode regulators.

AMD recommends separate power supplies be used for ADC and DAC. For certain applications where only ADCs are being used along with MTS, it is necessary to provide power to the DAC tiles but not enable the tiles. Under these circumstances, the DAC power supplies can be tied to the closest ADC power supply.

Capacitor specifications are specified in Appendix A (XC devices) and Appendix C (XQ devices).

 

IMPORTANT:   The guidelines provided as part of this document are for reference only. However, AMD recommends you do a detailed simulation analysis to validate the various specifications prior to releasing the board for fabrication. AMD can provide the necessary ADC/DAC S-parameter models for the die and package trace extracted using a full 3D field solver to facilitate this analysis. You can use these models in any EDA tool like ADS from Keysight to perform a detailed frequency-domain analysis to analyze insertion loss, return loss, crosstalk performance, and PN balance, respectively. You can request the die package models by talking to your local I/O/RF specialist.

Figure 3-31:      Power Regulation for Analog Supplies

X-Ref Target - Figure 3-31

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