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The Intersil X90100 is a non-volaTIle electronicallyprogrammable capacitor. The device is programmed througha simple digital interface. After programming, the chosensetTIng for the device is retained by internal EEPROMstorage whether or not DC power is maintained. There are32 programmable capacitance values selectable, rangingfrom 7.5pF to 14.5pF in 0.23pF increments, in single-endedmode. The dielectric is highly stable, and the capacitanceexhibits a very low voltage coefficient. It has virtually nodielectric absorbTIon and has a very low temperature driftcoefficient in differenTIal mode (<50ppm/°C).The X90100 is programmed through three digital interfacepins, which have Schmitt triggers and pullup resistors tosecure code retention. The three pins, INC, U/D, and CS,are identical in operation to other Intersil chips with up/downinterface, such as the X9315 5-bit Digitally ControlledPotentiometer (DCP).
