There is provided a data conversion method based on β-map suited for an A/D converter or chaos generator, that is adapted to an integrated circuit and capable of providing stable operation of the circuit. The data conversion method based on scale-adjusted β-map includes a discrete time integrator 1 having an amplification coefficient s(1−β) and a damping factor β, a quantizer 2connected in series to the discrete time integrator 1, and a feedback circuit 3 connected from an output of the quantizer 2 to an input of the discrete time integrator 1.