I am just curious on the schematics you show PGND and GND connected together. Have you seen an noise issues with the gronds?
Typically, an IC will have multiple grounds to isolate noise within the component but for the device to fucntion correctly the Gnd (analog/digital) needs to be referenced to the PGND relatively close to the device otherwise a differential in voltage can be impressed between the two grounds which can cause problems within the device.
If you wanted you could create a local GND around the device for its non-power signals that are referenced to ground then have this tied to the PGND at a single point with good coupling to the ground plane. Make sure to decouple each bias voltage back to its related ground if using this method.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.