The microphone's power supply rejection ratio (PSRR) measures its ability to reject noise on the power supply pins so that it does not affect the signal output. The PSRR is measured by applying a 217 Hz, 100 mV peak-to-peak sine wave to the VDD pin of the microphone. The PSRR measurement will give an indication of how many dB this input signal is attenuated from the output of the microphone. This parameter uses the 217 Hz frequency because in GSM telephony applications, the 217 Hz switching frequency is typically a major source of noise for the power supply.
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