[sdiy] Sine osc schematic

Neil Johnson neil.johnson71 at gmail.com
Wed Dec 6 12:56:21 CET 2017


Jarno Verhoeven wrote:
> The spec on the LTC6990 says 488Hz at lower end, I'd think you'd want it to
> go down lower.
> I'd be surprised if it is 1V/Oct, because that is a specific requirement,
> not used in measurement equipment.

The LTC6990 is being used to clock an LTC1059 (or LTC1060)
switched-capacitor filter configured as a quadrature oscillator.  Its
actually quite a neat solution - the frequency is set by one component
(the 6990) and the shape is set by another (the 1059/1060).


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