This article presents a design, modeling, simulation, and measurements of a hybrid photocurrent-to-digital converter integrated together with photo-diodes in a 130nm CMOS process, without any additional process steps. Photo-currents of integrated photo-diodes with different responsivities to different wavelength of the light and light intensity are converted into 22-bits digital results in 2ms. The results can then be converted into CIE XYZ or RGB color luminosity space using dedicated DSP algorithm. A high resolution, hybrid, ADC converts light induced photo-currents into 22-bit digital results, canceling the dark current of the photodiodes and 1/f noise and offset voltage of the input stage of the modulator. The whole converter consumes on average less than current at supply voltage at 10 conversions per second. It occupies approx. 0.8mm2 of silicon area, including the three photodiodes, a multiplexer, and the ΣΔ modulator. •A photocurrent-to-digital converter in 130nm CMOS technology.•Converter includes different photodiodes, the ADC and DSP.•The spectral responsivity of different photo-diodes is achieved through the layout.•The circuits eliminates dark current of a photo-diodes and offset voltage and 1/f noise of the amplifier.•Clock jitter influence is reduced using FIR-DAC filter.