[SI-LIST] ADC Grounding question - FULLY differential system

I have a question concerning the grounding of ADCs in a 100% differential 
system. What I mean by this is that the analog inputs AND digital outputs are 
all differential, for example the Analog Devices 9430.  The digital outputs are 
LVDS, a constant current technology.

Differential signalling is the traditional way to transmit signals between two 
systems
whose grounds are NOT CONNECTED.  So do I need to join analog and digital 
ground 
at all, save on the chassis and/or power supply circuitry?

Many thanks,


-- 
JP Nicholls  /  jpnicholls@xxxxxxxx

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