Ground and the USB-8451-> it should reference?

I use a usb-8451 attached to a PCB card which has its own means with separate analog and digital designs. When I join the 8451 grounded strange results of power supply occur. Is it allowed to leave separate and unconnected?

Devices USB usually get their power supply (+ 5V and GND) of the device, they are connected. There is no need of additional connections to GND. These additional connections can lead to "mass loops" that can pick up noise and cause errors. -The 'front end' of a device properly designed USB is isolated from the power supply. If you connect anything to the input of the USB device, use the GND or NOT the entrance terminal, of reference and NEVER the Terminal GND of the Board that powers the USB device.

Tags: NI Hardware

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