SPM0437HD4H-B TM Digital SiSonic Microphone The SPM0437HD4H is a miniature, high- Features: performance, low power, top port silicon Low Current digital microphone with a single bit PDM PDM Output output. Using Knowles proven high Supports Dual Multiplexed Channels TM performance SiSonic MEMS technology, Ultra-Stable Performance the SPM0437HD4H consists of an acoustic Standard SMD Reflow sensor, a low noise input buffer, and a Omnidirectional sigma-delta modulator. These devices are suitable for applications such as cellphones, smart phones, laptop computers, sensors, digital still cameras, portable music recorders, and other portable electronic devices where excellent wideband audio performance and RF immunity are required. Revision: A 7/25/2013 Sheet 1 of 13 2013 Knowles Electronics SPM0437HD4H-B 1. ABSOLUTE MAXIMUM RATINGS Parameter Absolute Maximum Rating Units V , DATA to Ground -0.3, +5.0 V DD CLOCK to Ground -0.3, +5.0 V SELECT to Ground -0.3, +5.0 V Input Current 5 mA Short Circuit Current to/from DATA Indefinite to Ground or V sec DD Temperature Range -40 to +100 C Stresses exceeding these Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only. Functional operation at these or any other conditions beyond those indicated under Acoustic & Electrical Specifications is not implied. Exposure beyond those indicated under Acoustic & Electrical Specifications for extended periods may affect device reliability. 2. ACOUSTIC & ELECTRICAL SPECIFICATIONS TEST CONDITIONS: 23 2C, 5520% R.H., V =1.8 V, F =2.4 MHz, SELECT pin is grounded, no load, DD CLOCK unless otherwise indicated Parameter Symbol Conditions Min Typ Max Units 1 Supply Voltage V 1.6 - 3.6 V DD 1,2,3 Supply Current I - 380 500 A DD 3 Sleep Current I F < 1 kHz - 6 10 A SLEEP CLOCK 1 Sensitivity S 94 dB SPL 1 kHz -29 -26 -23 dBFS Signal to Noise Ratio SNR 94 dB SPL 1 kHz, A-weighted 57.5 - dB(A) Total Harmonic THD 94 dB SPL 1 kHz, S = Typ - .5 % Distortion Acoustic Overload dB AOP 10% THD 1 kHz, S = Typ - 119 - Point SPL Power Supply dBV PSRR 200 mVpp sinewave 1 kHz - 51 - Rejection Ratio /FS Power Supply 100 mVpp square wave dBFS PSR - -80 - Rejection 217 Hz, A-weighted (A) DC Output Fullscale = 100 - -6 - % FS Directivity Omnidirectional Polarity Increasing sound pressure Decreasing density of 1s Data Format Cycle PDM Logic Input High V 0.65xV - 3.6 V IH DD Revision: A 7/25/2013 Sheet 2 of 13 2013 Knowles Electronics