Arrangement of at least one piezoacoustic resonator on a substrate surface of a substrate, wherein - the resonator has at least one piezoelectric layer, an electrode and at least one further electrode which are arranged in relation to one another in such a way that a specific electrical activation of the electrodes leads to a resonance oscillation of the resonator at a resonance frequency, - the surface of the substrate is formed by an acoustic mirror integrated in the substrate for the purpose of acoustically insulating the substrate and the resonator from each other, and - at least one evaluation device is provided for the purpose of determining the resonance frequency of the resonator, - the evaluation device and at least one of the electrodes are connected to each other in an electrically conductive manner by way of an electric conductor track and - the electric conductor track is routed through a mirror opening of the acoustic mirror, wherein - a lateral edge of the mirror opening of the acoustic mirror has an electrical opening insulation layer comprising opening insulation material on which the electric conductor track is applied, and wherein - the acoustic mirror has a mirror layer stack in which layers (1411, 1412) having lower acoustic impedance and higher acoustic impedance compared with one another are stacked alternately one on top of another, wherein - each of the layers has a layer thickness corresponding to approximately a quarter of a resonance wavelength of the resonance oscillation of the resonator, wherein - the topmost layer of the mirror layer stack forming the surface of the substrate has an electric mirror insulation layer comprising electric mirror insulation material and the mirror insulation material and the opening insulation material are made of silicon dioxide, wherein - a layer thickness of the mirror insulation layer and the layer thickness of the opening insulation layer are essentially identical and - the mirror insulation layer and the opening insulation layer form a cohesive overall insulation layer. - the resonator has at least one piezoelectric layer, an electrode and at least one further electrode which are arranged in relation to one another in such a way that a specific electrical activation of the electrodes leads to a resonance oscillation of the resonator at a resonance frequency, - the surface of the substrate is formed by an acoustic mirror integrated in the substrate for the purpose of acoustically insulating the substrate and the resonator from each other, and - at least one evaluation device is provided for the purpose of determining the resonance frequency of the resonator, - the evaluation device and at least one of the electrodes are connected to each other in an electrically conductive manner by way of an electric conductor track and - the electric conductor track is routed through a mirror opening of the acoustic mirror, wherein - a lateral edge of the mirror opening of the acoustic mirror has an electrical opening insulation layer comprising opening insulation material on which the electric conductor track is applied, and wherein - the acoustic mirror has a mirror layer stack in which layers (1411, 1412) having lower acoustic impedance and higher acoustic impedance compared with one another are stacked alternately one on top of another, wherein - each of the layers has a layer thickness corresponding to approximately a quarter of a resonance wavelength of the resonance oscillation of the resonator, wherein - the topmost layer of the mirror layer stack forming the surface of the substrate has an electric mirror insulation layer comprising electric mirror insulation material and the mirror insulation material and the opening insulation material are made of silicon dioxide, wherein - a layer thickness of the mirror insulation layer and the layer thickness of the opening insulation layer are essentially identical and - the mirror insulation layer and the opening insulation layer form a cohesive overall insulation layer.