Patent ID: 7268716

Claim:
A multibit ΔΣ modulation DA converter comprising: a filter unit that outputs a multibit digital signal with a predetermined frequency or lower thereof attenuated if a signal level of the input multibit digital signal is less than a predetermined threshold, the filter unit outputting the multibit digital signal without attenuation if the signal level is at the threshold or higher; a ΔΣ modulator that performs ΔΣ modulation of the signal output from the filter unit; a dynamic element matching circuit that divides the signal output from the ΔΣ modulator to a plurality of signals; and a plurality of internal DA converters that convert the plurality of signals output from the dynamic element matching circuit to an analog signal, wherein the filter unit includes: a high-pass filter that outputs the multibit digital signal with the frequency or lower thereof attenuated; a signal level detecting unit that outputs a result of comparison between the signal level and the threshold; and a controlling unit that controls whether or not the multibit digital signal is attenuated in the high-pass filter, based on the comparison result output from the signal level detecting unit.