Question about extra op amp input impedance

Question

Hello 
 The AD8231 datasheet does not seem to specify the input impedance of the extra op amp. The instrumentation amplifier states an input impedance of 10G ohm and 5 pF. However the op amp section of the datasheet does not specify the input impedance of the extra op amp. Is the input impedance to the extra op amp the instrumentation amplifier inputs? 
 
 Vs = 5.0 V:

Vs = 3V:

GLADION · Answer

Hi, 
 
 The in-amp input impedance and op-amp input impedance are not similar. Unfortunately, de wo not have readily-available information for AD8231's opamp input impedance. 
 
 Regards,

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Question about extra op amp input impedance