The ADAS1000 data sheet on page 33 shows a 4.5K resistor before the SP724 protection circuit. How much power dissipation should that resistor have to protect against a defibrillator discharge. Is a 1/4 watt resistor large enough?
Apologies for delayed response in getting back to your question.
The ADAS1000 respiration circuit works best with path impedance (cable, filtering defib protection) less than 5kohms (better if even smaller than this). Effective defibrillation protection is usually split up with current limiting resistors before and after the clamping device, hence the 4.5k and 500ohm split. The sizing of the resistors is up to the user and will be dictated by their end application requirements etc. The first resistor may be a phyical resistor in the patient cable, energy rated to survive the defib pulse or it could be a physical resistor in the circuit board. In either case, it needs to be able to withstand the defib pulse.
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