OSCx_GND termination (and using Clock instead of Crystal)

[dion]

QUESTION 1

The reference design notes for clock circuitry show Figures 1, 2 (copied from AM3358) with OSCx_GND pins connected to DGND. However, Figure 3 and all eval board schematics show no external connection to OSCx_GND pins.

Are OSCx_GND pins connected to DGND inside the OSM3358 SiP, or should there be an external connection to DGND?

QUESTION 2

Instead of a crystal, if I use a clock oscillator (e.g. SIT8008), how do I connect this clock oscillator chip’s GND pin?

(a) only to OSCx_GND pin?

(b) only to DGND?

(c) to both?

REFERENCES

https://octavosystems.com/app_notes/osd335x-design-tutorial/bare-minimum-boot/clock-circuitry/ –> Figures 1, 2, 3

[Neeraj Dantu]

Dion,

1. OSCx_GND pins are connected to ground inside the SiP. So, there is no need to have an external ground connection for the OSCx_GND

2. You can connect the ground pin of the oscillator to DGND or to OSCx_GND as the pin is connected to ground internally

Neeraj

[Author]

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