input impedance/resistance of MAX11259, MAX11254 and ad7124-4

Question

Hi, what is the analog input impedance/resistance of MAX11259, MAX11254 and ad7124-4? From all the 3 datasheet, there is no such info but only something related to analog (differential) input current. Is there any way to calculate from the analog input current? Thank you.

RAdante · Accepted Answer

Hi , 
 Only Maxim ATE products are supported on EngineerZone at this time. Over the next several months, you will see more Maxim products being supported in EngineerZone. Please visit one of the technical support pages on our newly integrated website below for assistance with Maxim Integrated products. 
 EN - https://www.analog.com/en/support/technical-support.html# CN - https://support.analog.com/zh-CN/technical-support/ JP - https://support.analog.com/ja-JP/technical-support/ 
 For AD7124-4, we list the input current specification rather than specify the input impedance. The input impedance can be calculated from this input current specification. When buffer is enabled, the absolute input current is +/-1nA for low power mode, +/-1.2nA for mid power mode and +/-3.3nA for full power mode. With Gain > 1, the input buffers are automatically enabled. Thus, it can handle any significant source impedances which allows external filtering necessary in your application. When, un-buffered the absolute input current is +/-2.65uA/V. These values can be found in datasheet specification section. 
 Regards, 
 Rod)

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input impedance/resistance of MAX11259, MAX11254 and ad7124-4