The modulator is a multibit delta-sigma architecture featuring low power consumption with very low levels of spurious tones in the output. The modulator shapes the quantization noise of the internal quantizer to an out-of-band frequency range where the noise is removed by the digital filter. Noise remaining within the pass-band region is thermal, with the characteristic of constant noise density (white noise). The total noise in the ADC output is determined by the digital filter OSR.