SPH0645LM4H-B I2S Output Digital Microphone SPH0645LM4H-B Rev C Datasheet The SPH0645LM4H-B is a miniature, low power, bottom port microphone with an I2S digital output. The solution consists of a proven high performance SiSonic acoustic sensor, a serial Analog to Digital convertor, and an interface to condition the signal into an industry standard 24-bit I2S format. The I2S interface simplifies the integration in the system and allow direct interconnect to digital processors, application processors and microcontrollerss. Saving the need of an external audio codec, the SPH0645LM4H-B is perfectly suitable for portable applications where size and power consumption are a constraint. Product Features High SNR of 65dB(A) Low Current of typ. 600A I2S Output: Direct attach to P Multi modes: standard >1MHz, 600uA / sleep <1kHz, 3uA Flat Frequency Response RF Shielded Supports Dual Microphones Typical Applications Ultra-Stable Performance Small portable devices: wearables Standard SMD Reflow Set-top boxes: TV, gaming, remote controllers Omnidirectional Smart home devices, Internet of Things, Bottom-Ported Microphone Connected equipment 3.50 x 2.65 x 0.98 mm SPH Package Size No Codec Application SPH0645LM4H-B Needed Processor Microphone I2S Filter I2S Interface 1 knowles.com Datasheet SPH0645LM4H-B Rev C Absolute Maximum Ratings Table 1: Absolute Maximum Ratings Parameter Absolute Maximum Rating Units VDD BCLK, WS, SELECT to Ground -0.3, +5.0 V , Input Current 100 mA Short Circuit to/from DATA Indefinite to Ground or Vdd Sec Temperature -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. 1 Acoustic & Electrical Specifications Table 2: TEST CONDITIONS: 25 2C, 5520% R.H., VDD =1.8V, fCLOCK = 3.072 MHz with a 0.1uF decoupling capacitor across Vdd and GND, unless otherwise indicated Parameter Symbol Conditions Min. Typ. Max Units Directivity Omnidirectional Polarity Increasing sound pressure Output Magnitude Increases Functional Temperature Functional with lower performance -40 - 100 C Operating Temperature Specifications guaranteed 0 - 45 C Supply Voltage V 1.62 1.8 3.6 V DD Clock Frequency f 1024 3072 4096 kHz CLOCK Sleep Clock Frequency f - - 1 KHz sleep 2 Supply Current I - 600 - A DD Sleep Current IDDSLEEEP - 3 10 uA Short Circuit Current I Grounded DATA pin 2 - 10 mA SC Sensitivity S 94 dB SPL 1 kHz -29 -26 -23 dBFS Signal to Noise Ratio SNR 94 dB SPL 1 kHz, A-weighted - 65 - dB(A) 6 DC Offset Fullscale = 100 - 5 - % Total Harmonic Distortion THD 94 dB SPL 1 kHz, S = Typ. - 0.2 1 % Total Harmonic Distortion THD 1% THD 94 110 dB SPL Acoustic Overload Point AOP 10% THD 1 kHz, S = Typ. - 120 - dB SPL Power Supply Rejection Ratio PSRR 200 mVpp sine wave 1kHz - 80 - dB 100 mVpp 1/8th duty cycle Power Supply Rejection +Noise PSR+N rectangular wave 217 Hz, - -86 dB(A) VDD = 1.8V, A-weighted 3,4,5 Power-up Time t V V(min) - - 50 Ms POWERUP DD 1 Sensitivity and Supply Current are 100% tested. 2 Idd varies with Cload according to: Idd = 0.5*V *Cload*f . DD CLOCK 3 Valid microphones states are: Powered Down Mode (mic off), Sleep Mode (low current, DATA = high-Z, fast startup), and Active Mode. 4 Time from Fclock < 1 kHz to Isleep specification is met when transitioning from Active Mode to Sleep Mode. 5 Time from Fclock 1 MHz to all applicable specifications are met when transitioning from Sleep Mode to Active Mode. 6 DC offset can be removed from the PCM samples if desired by implementing a DC-blocking or high-pass filter. 2 knowles.com Datasheet SPH0645LM4H-B Rev C