[sdiy] VCLFO and VCADSR details available online

[ASSI]

On Montag, 18. Dezember 2006 23:43, Adam Schabtach wrote:
> It seems like protecting the A/D
> inputs of micros must be a common-enough problem that someone has a
> simple solution, like maybe an off-the-shelf chip...?

Two stacked (Schottky) diodes in blocking direction between GND and 5V 
and the input connected through midpoint of the two diodes.  There must 
be some current limiter in the input (read a resistor), but the 
impedance should not be exceedingly high, otherwise noise and the 
voltage dependent capacitance from the diodes will degrade the signal.  
The diode arrangement is available in multiples as IC for bus 
protection.


Achim.
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