SPM1437HM4H-B TM Digital SiSonic Microphone The SPM1437HM4H-B is a miniature, high- Features: performance, low power, top port silicon High Sensitivity digital microphone with a single bit PDM Low Current output. Using Knowles proven high RF Shielded TM performance SiSonic MEMS technology, PDM Output the SPM1437HM4H-B consists of an Ultra-Stable Performance acoustic sensor, a low noise input buffer, Standard SMD Reflow and a sigma-delta modulator. These devices Omnidirectional 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: B 11/12/2013 Sheet 1 of 13 2013 Knowles Electronics SPM1437HM4H-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 -25 -22 -19 dBFS Signal to Noise Ratio SNR 94 dB SPL 1 kHz, A-weighted 60 61.5 - dB(A) Total Harmonic THD 94 dB SPL 1 kHz, S = Typ - .3 % Distortion Acoustic Overload dB AOP 10% THD 1 kHz, S = Typ - 117 - 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: B 11/12/2013 Sheet 2 of 13 2013 Knowles Electronics