A surface acoustic wave device has a significantly improved frequency temperature characteristic due to the arrangement of a SiO2 film on an IDT such that cracking in the SiO2 film surface is prevented from occurring, desired characteristics are reliably achieved, the electromechanical coupling coefficients is increased, and the attenuation constant \u03b1 is reduced. To this end, by referring to dot patterns in which a print or a non-print of dots onto each pixel corresponding to a printing resolution are in advance defined, quantization data is converted into binary data having the higher printing resolution. The sensor circuit may include circuitry to capture and convert a phase associated with a count to a binary fractional value to increase voltage resolution.