[sdiy] dsPIC CV input protection

ASSI Stromeko at nexgo.de
Sat Nov 15 18:56:18 CET 2008

On Samstag 15 November 2008, Seb Francis wrote:
> So, same question for the CV inputs.  The dsPIC ADC again has input
> range 0 to 3.3V (with 0.3V margin to absmax figures)

National Semiconductor has just announced the LMH6553 with a 
programmable output clamp for that very purpose (this is a real 
problem and not easy to solve when you need to keep the input 
impedance to the ADC low).  The 900MHz bandwisth may be overkill for 
you, more traditional solutions are in "OpAmp Applications" (ed. by 
Walt Jung), excerpted here:


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