Δ-Σ AD converter and sensor device

A ΔΣ AD converter which converts an input analog signal into a digital signal, the ΔΣ AD converter comprising:

• a ΔΣ AD modulator which receives the analog signal and outputs a modulated signal;
• an accumulator which accumulates the modulated signal and outputs a cumulative value;
• a counter which counts a set count value;
• an adjustment value storage part which stores an adjustment value of the count value and an adjustment value of an offset value;
• a first adder which outputs an adjustment cumulative value obtained by adding the cumulative value and the adjustment value of the offset value;
• a cumulative value latch part which receives the adjustment cumulative value;
• and
• a control circuit which receives the adjustment cumulative value, the count value from the counter, and a threshold value of the adjustment cumulative value for determining a temperature range from the adjustment value storage part, and outputs a control signal to the counter and a latch signal to the cumulative value latch part,
• wherein the control circuit determines the temperature range according to the adjustment cumulative value received from the first adder in a case where the count value received from the counter reaches a predetermined value, and outputs a signal designating the temperature range to the adjustment value storage part,
• the adjustment value storage part outputs the adjustment value of the offset value and the adjustment value of the count value according to the designated temperature range to the first adder and the counter, and
• the control circuit outputs the latch signal to the cumulative value latch part in response to completion of counting by the counter.