Appendix C - Imager Power Supply Noise And Pcb Layout; Considerations And Methods For The Power Supply - Hand Held Products IT4000 Integration Manual

C
Imager Power Supply Noise and PCB Layout
The CMOS Imager is an analog circuit with a digital interface include. The power provided to it should follow noise and stability
guidelines normally used for an analog CMOS type of device. The quieter and more stable the supply, the cleaner the images
acquired. The lower the noise content in an image (good S/N ratio), the better the performance of the system as a whole.

Considerations and Methods for the Power Supply

The power supply should be isolated from the digital processing power supply, if possible. If the digital processing supply must
be used, you must be careful to capacitively decouple or filter the power before the IT4X00 Series interface connector.
A "Star" PCB layout strategy for the power and ground is suggested to minimize digital power plane noise coupling to the IT4X00
Series. The power supply trace must ensure as low an impedance value as possible.
IMAGETEAM™ 4X00 Series Integration Manual C - 1