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Thread: Signal source impedance for ADC in AT90S8535?
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face BY : David VanHorn email (remove spam text)



At 06:06 PM 11/2/01 +0100, Wojciech Zabolotny wrote:
>Hi All,
>
>I have to design a simple circuit using the ADC in AVR AT90S8535.
>I remeber the strong requirements for signal source impedance in PICs,
>but the only info in 8535 datasheet was "RAIN Analog Input Resistance = 100
>MOhm (typ.)". Does it mean that the S/H in 8535 features the internal
>voltage follower or something like this?
>I'd appreciate any pointers.

Basically yes.  It's input impedance is high enough that in most
applications you can consider it infinite.

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