I want to know the input impedance of on-chip buffer in the AD7795.
Please let me know your reply about it.
Hello Mr. K,
rather than specify the impedance, we list the input current for the analog inputs. For a gain of 1 or 2 and buffer enabled, the average input current is 1 nA max. For higher gains, the average input current is +/-250 pA max. This is true for channels AIN1 to AIN5. For channel AIN6, the average input current is 1 nA max for all gains.
Therefore, the impedance is several hundred megaohms.
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