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WM7133L Datasheet(PDF) 5 Page - Wolfson Microelectronics plc |
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WM7133L Datasheet(HTML) 5 Page - Wolfson Microelectronics plc |
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5 / 13 page  Pre-Production WM7133L w PP, May 2014, Rev 3.1 5 ACOUSTIC AND ELECTRICAL CHARACTERISTICS Test Conditions: VDD=1.8V, 1kHz test signal, TA = 25°C PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Directivity Omni-directional Polarity Positive sound pressure Positive output voltage Sensitivity S 94dB SPL -41 -38 -35 dBV Acoustic Overload No load, THD < 10% 126 dB SPL Total Harmonic Distortion THD 100dB SPL 0.1 1 % 114dB SPL 0.2 122dB SPL 1 Signal to Noise Ratio SNR A-weighted 64.5 dB Dynamic Range DR A-weighted 92.5 dB Frequency Response -3dB low frequency 85 Hz +3dB high frequency 10600 Acoustic Noise Floor A-weighted 29.5 dB SPL Electrical Noise Floor A-weighted -102.5 dBV Power Supply Rejection Ratio PSRR 217Hz sine wave, 100mV (peak-peak) 70 dB Power Supply Rejection PSR 217Hz square wave, 100mV (peak-peak) -96 dBV Current Consumption IVDD 180 240 µA Output DC Impedance ZOUT 55 Ω TERMINOLOGY 1. Sensitivity (dBV) - Sensitivity is a measure of the microphone output response to the acoustic pressure of a 1kHz 94dB SPL (1Pa RMS) sine wave. 2. Total Harmonic Distortion (%) – THD is the ratio of the RMS sum of the harmonic distortion products in the specified bandwidth (see note below) relative to the amplitude of the fundamental (ie. test frequency) output. 3. Signal-to-Noise Ratio (dB) – SNR is a measure of the difference in level between the output response of a 1kHz 94dB SPL sine wave and the idle noise output. 4. Dynamic Range (dB) – DR is the ratio of the 1% THD microphone output level (in response to a sine wave input) and the idle noise output level. 5. All performance measurements are carried out within a 20Hz to 20kHz bandwidth and, where noted, an A-weighted filter. Failure to use these filters will result in higher THD and lower SNR values than are found in the Acoustic and Electrical Characteristics. The low pass filter removes out of band noise. |
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