Probably not. The chip was obsolete before simulators were widely available. Since the chip is no longer being manufactured there is little point in anybody expending any effort on making a model.Can any one help me by giving the inner circuit of XR2240
Papabravo, you are confusing the poor OP. The XR2240 is a Programmable Timer/Counter. I believe you are referring to the Function Generator chip which has a similar part number.Your best bet is to understand the Voltage Controlled Oscillator (VCO). The sine function can also be obtained with a dual op-amp integrator that solves the differential equation of a simple harmonic oscillator(aka a Quadrature Oscillator). There are simple relaxation oscillators that will produce a square wave. If you integrate a square wave you will derive a triangle wave.
http://en.wikipedia.org/wiki/Voltage-controlled_oscillator
http://en.wikipedia.org/wiki/Relaxation_oscillator
http://www.ti.com/sc/docs/apps/msp/journal/aug2000/aug_07.pdf
http://en.wikipedia.org/wiki/Multivibrator
http://forum.allaboutcircuits.com/showthread.php?t=55414
Those references should keep you off the streets for a while.
Rumors of Exars' demise have been greatly exaggerated:Exar, the company that originally made those chips, is sorta like Gen. Franco -- still dead.