The supply rail is 5V. The actual peak to peak voltage of the triangle wave is (hoped) to be about 4.95V. On Thu, Jun 6, 2019 at 4:34 PM Richard Prosser wrote: > > Hi Jason > Looks like your calculations check out OK. > I've never seen 2nd order slew rate specified - but you could check > distortion figures, if they're available. > As far as rounding goes, I'd look at a simulation package or even set up = a > spreadsheet type approach if it's critical. > > Re the actual figure - what supply rail are you running? Slew rate > typically applies in the small signal linear region and if youre trying f= or > 5V pk-pk on a 5V supply you will probably have issues. There may be a > difference between large (>20% supply ?) & small signal (<5% ?) rates. > > RP > > On Fri, 7 Jun 2019 at 07:31, Jason White > wrote: > > > Hello PICLIST, > > > > I am looking for a sanity check. > > > > The MCP6001 has a published minimum slew rate of at least 0.4V/us at > > 5V and -40C. 0.4V/us=3D400kV/s. > > > > In my application I am generating a 5V pk-pk 25kHz triangle wave. The > > slew rate of a 25kHz triangle wave voltage rise V over time t. For > > slew rate the time would be 1/2 the period of the triangle wave or > > 1/2*1/25kHz=3D20us, the rise would be 5V. 5V/20us=3D250kV/S=3D0.25V/us > > > > According to this the required slew rate for the triangle wave is > > 0.25V/us which is within the 0.4V/us limit. > > > > Four questions: > > * Does the slew rate calculation given above "check out" ? > > * Slew rate is rate of change (the first derivative) of the output. > > Are op-amps ever rated for rate of rate of change (second derivative) > > of the output? > > * Is there a way to deduce how much rounding will occur on the sharp > > points of the triangle wave from the MCP6001 ratings? > > > > -- > > Jason White > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 Jason White --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .