PDF WM7230E Data sheet ( Hoja de datos )

Número de pieza	WM7230E
Descripción	Bottom Port Digital Silicon Microphone
Fabricantes	Cirrus Logic
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No Preview Available ! WM7230E Bottom Port Digital Silicon Microphone DESCRIPTION The WM7230 is a low-profile silicon digital microphone. It offers high Signal to Noise Ratio (SNR) and low power consumption and is suited to a wide variety of consumer applications. The WM7230 incorporates Cirrus Logic proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The WM7230 is designed to withstand the high temperatures associated with automated flow solder assembly processes. (Note that conventional microphones can be damaged by this process.) The WM7230 incorporates a high performance ADC, which outputs a single-bit data stream using Pulse Density Modulation (PDM) encoding. The WM7230 supports selectable left/right channel assignment for a two-channel digital microphone interface, enabling efficient connection of multiple microphones in stereo/array configurations. The WM7230 offers tight tolerance on the microphone sensitivity, giving reduced variation between parts. This removes the need for in-line production calibration of part- to-part microphone variations. FEATURES  High SNR (61dB)  Low variation in sensitivity (±1dB tolerance)  Low current consumption - 2μA (Sleep) - 735μA (Normal operation)  PDM digital audio output  Stereo/array operation  Proprietary ADC technology - Reduced clock jitter sensitivity - Low noise floor - Stable in overload condition  Bottom Port LGA Package  1.64V to 3.7V supply APPLICATIONS  Mobile telephone handsets  Portable computers  Portable media players  Digital still cameras  Digital video cameras  Bluetooth™ headsets  Portable navigation devices BLOCK DIAGRAM WM7230 VDD CHARGE PUMP CONTROL 3D VIEW CLK DAT LRSEL CMOS MEMS Transducer AMP ADC GND 4.00mm x 3.00mm x 1.00mm LGA package Pre-Production http://www.cirrus.com This document contains information for a product under development. Cirrus Logic reserves the right to modify this product. Copyright  Cirrus Logic, Inc., 2010–2016 (All Rights Reserved) Rev 3.3 MAR ‘16 1 page WM7230E ACOUSTIC AND ELECTRICAL CHARACTERISTICS Test Conditions: VDD=1.8V, 1kHz test signal, CLK=2.4MHz, TA = 25°C, unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX Directivity Omni-directional Polarity (see note) Positive sound pressure Decreasing density of 1s Sensitivity S 94 dB SPL -27 -26 -25 Acoustic Overload No load, THD < 10% 120 Total Harmonic Distortion THD 94dB SPL 0.1 114dB SPL 0.5 117.5dB SPL 1 Signal to Noise Ratio SNR A-weighted 61 Dynamic Range DR A-weighted 84.5 Acoustic Noise Floor A-weighted 33 Electrical Noise Floor A-weighted -87 Frequency Response +3dB high frequency 17000 Frequency Response Flatness 200Hz to 8kHz -1 +1 Power Supply Rejection PSR 217Hz square wave, 100mV (peak-peak) -75 Digital Input / Output CLK Input HIGH Level VIH 0.65 x VDD CLK Input LOW Level VIL 0.35 x VDD DAT Output HIGH Level VOH IOH = +1mA 0.9 x VDD DAT Output LOW Level VOL IOL = -1mA 0.1 x VDD Input capacitance (CLK) 0.5 Input leakage 1 Maximum load capacitance (DAT) CLOAD 100 Short Circuit Output Current Miscellaneous ISC DAT connected to GND 10 Current Consumption IVDD Active Mode Sleep Mode 735 2 10 Start-up Time From OFF 10 From Sleep 10 CLK Sleep Frequency 1.0 UNIT dBFS dB SPL % dB dB dB SPL dBFS Hz dB dBFS V V V V pF μA pF mA μA ms kHz Note: The WM7230 generates a single-bit digital (PDM) output in response to the acoustic input. A positive sound pressure on the diaphragm generates a decreasing density of 1’s in the PDM stream (ie. there is a phase inversion between the acoustic input and the digital output). Rev 3.3 5 5 Page PACKAGE DIMENSIONS WM7230E Rev 3.3 11 11 Page

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