Piezo-electric accelerometers
Mmilbury,
I believe there could be a mis-quote in your posting -- piezo-electric accelerometers produce Coulombs of charge as their output, not volts.
A typical industrial accelerometer will produce 25pC/g so if you meant charge, your 120pC/g unit is a massive output :shock:
One Coulomb is one amp.second [NOTE that is multiplying NOT dividing]
One amp is one Coulomb/second [This is dividing !]
Because of the extremely small energy levels involved, these devices are connected with 'charge cable' - a good quality sceened cable - to a 'charge amplifier' which produces around 100mV/g (fancy name, simple circuit!). Could this be what you meant? 120mV/g ?
It is impossible to connect directly from accelerometer to A/D, you must use a charge amp -- accelerometers are available (for a price!) that contain the charge amp and so give mV/g directly, but then they require power, usually over the same two wires as the signal, so some DC offset is involved (possibly 12 to 24v DC).