What accuracy can AD7606 achieve for the input impedance crossing devices? This will affect the signal acquired accuracy for the board and consistency cross the board when add serial resistor before inputs.
I am looking into this and get back to you soon.
Sorry for the delay on this.
In terms of the accuracy across channel, although we cannot guarantee, the average error would be around 1 LSB between two channel.
In figure 24 of the datasheet is THD graph of various source impedance values and its effect across frequencies. At lower frequencies, 1 Kohm impedance have little effect but a the frequency increase it mattered. Impedance at 20k has obvious effect at lower frequencies.
By the way, what type of application you are using the AD7606 for?
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