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CS7250B Datasheet(PDF) 5 Page - Cirrus Logic |
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CS7250B Datasheet(HTML) 5 Page - Cirrus Logic |
5 / 11 page 5 DS1072PP1 CS7250B 3 Characteristics and Specifications 3 Characteristics and Specifications Table 3-1. Parameter Definitions Parameter Definition Sensitivity A measure of the microphone output response to the acoustic pressure of a 1-kHz, 94 dB SPL (1 Pa RMS) sine wave. This is referenced to the output Full Scale Range (FSR) of the microphone. Full Scale Range (FSR) Sensitivity, electrical noise floor and power supply rejection are measured with reference to the output full scale range (FSR) of the microphone. FSR is defined as the amplitude of a 1-kHz sine-wave output whose positive peak value reaches 100% density of logic 1s and whose negative peak value reaches 0% density of logic 1s. This is the largest 1-kHz sine wave that fits in the digital output range without clipping. Note that, because the definition of FSR is based on a sine wave, it is possible to support a square wave test signal output whose level is +3 dBFS. Total harmonic distortion (THD) The ratio of the RMS sum of the harmonic distortion products in the specified bandwidth (see note) relative to the RMS amplitude of the fundamental (i.e., test frequency) output. Signal-to-noise ratio (SNR) A measure of the difference in level between the output response of a 1-kHz, 94 dB SPL sine wave and the idle noise output. Dynamic Range (DR) The ratio of the 10% THD microphone output level (in response to a sine wave input) and the idle noise output. Note: Unless otherwise specified, all performance measurements are specified with a low-pass brick-wall filter and, where noted, an A-weighted filter. The low-pass filter removes out-of-band noise. Table 3-2. Recommended Operating Conditions Parameter Symbol Min Typ Max Units Supply voltage VDD 1.62 1.8 1.98 V Ground GND — 0 — V Clock frequency FCLK 0.3 — 3.2 MHz Operating temperature range TA –40 — +85 ºC Table 3-3. Absolute Maximum Ratings Absolute maximum ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under electrical characteristics at the test conditions specified. Parameter Symbol Min Max Units Supply voltage 1 1.All voltages are measured with respect to GND. VDD –0.3 2.4 V Input voltage 1 VIN –0.3 2.3 [2] 2.If VDD is above the minimum recommended operating level (see Table 3-2), the maximum input voltage is VDD + 0.3 V. V Input current 3 3.Input current is positive when flowing into the device. IIN –10 +10 mA Operating temperature range TA –40 +105 ºC Storage temperature prior to soldering TStgp —30 ºC Storage relative humidity prior to soldering RHStgp —60 % Storage temperature after soldering TStg –40 +105 ºC ESD-sensitive device. The CS7250B is manufactured on a CMOS process. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. This device is qualified to current JEDEC ESD standards |
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