Pyroelectric-type infrared detector and integrated circuit

A pyroelectric infrared detector that includes:

• a package;
• one or more pyroelectric elements housed in the package;
• and an integrated circuit that is housed in the package and that performs processing of a detection signal based on an output of the pyroelectric element, the pyroelectric infrared detector characterized in that:
• the integrated circuit comprises:
• a converter that performs analog-to-digital conversion of the detection signal;
• a signal processor that performs signal processing by a digital filter for the detection signal converted into a digital signal;
• and
• an input-output controller that delivers output data from the signal processor to an external device via serial data communication, and
• a cut-off frequency of the digital filter is settable and changeable by voltage application to the integrated circuit or by a command supplied from the external device via the serial data communication.