Circuit device, oscillator, electronic apparatus, and moving object

A circuit device comprising:

• an A/D converter configured to convert a temperature detection voltage from a temperature sensor unit to a temperature detection data by way of a first A/D conversion process or a second A/D conversion process, wherein the second A/D conversion process is different from the first A/D conversion process;
• and
• a digital signal processing circuit configured to execute a temperature compensation process based on the temperature detection data, wherein:
• during an activation period, the A/D converter is configured to execute the first A/D conversion process and determines an initial value of the temperature detection data, wherein the initial value corresponds to first temperature detection data at a first output timing, and
• during a normal operation period subsequent to the activation period, the A/D converter is configured to
• execute the second A/D conversion process and determine a subsequent temperature detection data based on the initial value, wherein the subsequent temperature detection data corresponds to second temperature detection data at a second output timing following the first output timing, and
• limit a change of the second temperature detection data relative to the first temperature detection data based on a conversion resolution of the A/D converter such that the change of the second temperature detection data is less than or equal to a same fixed value in each conversion.