VM3000

VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET GENERAL DESCRIPTION The VM3000 is a high performance, low noise digital MEMS microphone. It features a PDM output enabling multiplexing of two microphones on a single data line. The digital output has high immunity to RFI and EMI providing designers with more flexibility in the position of the mics and the routing of their wires in system. The VM3000 has an industry standard 3.5x2.65x1.3mm package. The microphone is solder reflow compatible with no sensitivity degradation. It operates in environmentally harsh surroundings being dust and moisture resistant. FEATURES • • • • • • • • • Digital Output, Pulse Density Modulation (PDM) Less than 1μA current consumption in Sleep mode Ultra-fast startup, 200 μSec, from all modes Dust and moisture resistant, IP58 Flat Frequency Response Sensitivity Matching Supports Dual Multiplexed Channels on DATA line RFI and EMI robust Industry standard 3.5 x 2.65mm LGA package footprint BLOCK DIAGRAM APPLICATIONS • • • • • Beamforming Arrays Smart Home Devices Outdoor Applications Wearables IP Security Cameras ORDERING INFORMATION Product Package Description Quantity VM3000AA 13” Tape and Reel 5,000 Document Name: VM3000_Datasheet Revision: U0.0.8 TYPICAL APPLICATION CIRCUIT Page 1 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET TABLE OF CONTENTS GENERAL DESCRIPTION ..................................................................................................................................1 FEATURES ......................................................................................................................................................1 APPLICATIONS ...............................................................................................................................................1 ORDERING INFORMATION ..............................................................................................................................1 BLOCK DIAGRAM ............................................................................................................................................1 TYPICAL APPLICATION CIRCUIT ......................................................................................................................1 TABLE OF CONTENTS .....................................................................................................................................2 SPECIFICATIONS ............................................................................................................................................3 DEVICE MODES ..............................................................................................................................................4 CHANNEL SELECTION .....................................................................................................................................4 PDM DIGITAL SPECIFICATIONS .......................................................................................................................4 ABSOLUTE MAXIMUM RATINGS .......................................................................................................................4 ENVIRONMENTAL ROBUSTNESS ......................................................................................................................5 RELIABILITY SPECIFICATIONS ........................................................................................................................5 MICROPHONE OPERATION ..............................................................................................................................5 MICROPHONE MODES .....................................................................................................................................6 TIMING SPECIFICATIONS ................................................................................................................................7 TYPICAL PERFORMANCE CHARACTERISTICS ....................................................................................................8 SOLDER REFLOW PROFILE ..............................................................................................................................8 HANDLING INSTRUCTIONS .............................................................................................................................9 DIMENSIONS AND PIN LAYOUT .......................................................................................................................9 PCB DESIGN AND LAND PATTERN LAYOUT .................................................................................................... 10 TAPE AND REEL SPECIFICATIONS ................................................................................................................. 10 LID MARKING ............................................................................................................................................... 11 SUPPORTING DOCUMENTS ........................................................................................................................... 12 COMPLIANCE INFORMATION ......................................................................................................................... 12 CONTACT DETAILS ....................................................................................................................................... 12 LEGAL INFORMATION ................................................................................................................................... 12 REVISION HISTORY ...................................................................................................................................... 13 Document Name: VM3000_Datasheet Revision: U0.0.8 Page 2 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET SPECIFICATIONS Table below shows General Acoustic and Electrical specifications at 25°C, VDD = 1.8 V, unless otherwise noted. Parameter Symbol Supply Voltage VDD Sensitivity SENS Conditions 1 kHz, 94 dB SPL Min. Typ. Max. 1.6 1.8 3.6 V -27 -26 -25 dBFS Output DC Offset 0 Roll Off Frequency -3dB at 1KHz Units % FS 100 Directivity Hz Omni Polarity Increase in sound pressure Increase in density of 1’s Supply Current- Sleep Mode VDD On, CLK Off (CLK must be logic LOW) 0.35 μA Supply Current- Standby Mode VDD On, CLK < 250 kHz 145 μA 0.1 mS 0.2 mS 0.2 mS No PDM Output Time to First Data Bit Time from valid Vdd and CLK until first valid bit is driven on the DATA line. Output is Hi-Z until then. Startup Time (Powered Down, Sleep, or Standby) → Active (Low Power or Normal Mode) Within ±0.5dB of actual sensitivity Mode-Change Time Between any modes (Sleep, Standby, Low Power, Normal) Table below shows specifications for Normal Mode (1.1MHZ < CLK < 4MHZ) at 25°C, VDD = 1.8 V, CLK = 2.4MHz, unless otherwise noted. Parameter Symbol Signal-to-Noise Ratio SNR Signal-to-Noise Ratio, Voice Band SNR Total Harmonic Distortion THD Acoustic Overload Point Power Supply Rejection Ratio Power Supply Rejection Supply Current Document Name: VM3000_Datasheet Revision: U0.0.8 Conditions Min. 94 dB SPL at 1 kHz signal, 20Hz-20kHz, A-weighted Noise 94 dB SPL at 1 kHz signal, 20Hz-8kHz, A-weighted Noise Typ. Max. Units 62.5 dB(A) 64 dB(A) 94 dB SPL 0.1 120dB SPL 1 AOP 10.0% THD 122 dB SPL PSRR VDD = 1.8, 1kHz, 100mVPP Sine Wave -76 dBFS/dBV -87 dB(A) CLK = 1.536MHz 575 μA CLK = 2.4MHz 700 μA CLK = 3.072MHz 800 μA PSR VDD = 1.8, 217Hz, 100mVPP square wave, 20 Hz – 20kHz, A-weighted Page 3 of 13 info@vespermems.com % Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET Table below shows specifications for Low Power Mode (350kHZ < CLK < 900kHz) at 25°C, VDD = 1.8 V, CLK = 768kHz, unless otherwise noted. Parameter Symbol Signal-to-Noise Ratio, Voice Band SNR Total Harmonic Distortion THD Conditions Min. Typ. 94 dB SPL at 1 kHz signal, 20Hz-8kHz, A-weighted Max. Units 63 Noise 94 dB SPL 0.1 120dB SPL 1 dB(A) % Acoustic Overload Point AOP 10.0% THD 122 dB SPL Power Supply Rejection Ratio PSRR VDD = 1.8, 1kHz, 100mVPP Sine Wave -76 dBFS/dBV -87 dB(A) 400 μA Power Supply Rejection PSR Supply Current VDD = 1.8, 217Hz, 100mVPP square wave, 20 Hz – 8kHz, A-weighted CLK = 768kHz DEVICE MODES Mode Transition Time to Low Supply Current or Normal Power (Typical, μA) NA 200 μSec NA VDD ON, CLK OFF (LOGIC LOW) NA 200 μSec 1.1 MHz PDM NA 700 μA MODE Conditions OFF VDD OFF SLEEP STANDBY LOW POWER NORMAL POWER Output on DATA Pin CHANNEL SELECTION Channel Select Asserts DATA on Latch DATA on Left GND Falling Edge of CLK Rising Edge of CLK Right VDD Rising Edge of CLK Falling Edge of CLK PDM DIGITAL SPECIFICATIONS Parameter Conditions Logic Input High Min. Typ. 0.65*VDD Logic Input Low -0.3 Logic Output High ILoad = 0.5mA Logic Output Low ILoad = 0.5mA 0.7*VDD Max. Units VDD V 0.35*VDD V VDD 0 Driving Capability V 0.3*VDD AV 100 pF ABSOLUTE MAXIMUM RATINGS Parameter Rating Units Supply Voltage -0.3 to +3.6 V Sound Pressure Level 160 dB re 20 μPa Operating Temperature Range -40 to +85 °C Storage Temperature Range -55 to +150 °C Document Name: VM3000_Datasheet Revision: U0.0.8 Page 4 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET ENVIRONMENTAL ROBUSTNESS IP adherence is evaluated by 1kHz Sensitivity spec post stress Ingress Protection Type Description Dust Resistance IP5X; Water Immersion IPX8; 2 hours drying time, dry environment RELIABILITY SPECIFICATIONS Stress Test Description Temperature Cycling Test -40°C to +125°C, 850 cycles High Temperature Operating Life +125°C, 1000 hours, biased High Temperature Storage +125°C, 1000 hours, unbiased Temperature Humidity Bias +85°C, 85% RH, 1000 hours, biased Reflow 3 reflow cycles with peak temperature of +260°C ESD-HBM 3 discharge, all pins, ± 4kV ESD-CDM 3 discharges, all pins, ± 750V MICROPHONE OPERATION The VM3000 is a Pulse Density Modulated (PDM) digital output microphone. It takes the audio signal from the Piezo MEMS element, amplifies it and samples at a very high rate, converting it to a single-bit stream PDM using a fourth order sigma delta modulator. This PDM data (DATA) is ready to be interfaced directly to a codec, applications processor or other compatible hardware. The master system (codec etc.) provides the master clock, CLK which defines the rate at which the bits are transmitted on the DATA line. The data is set on the rising or falling edge of the CLK, defined by the L/R Select pin, with L/R Select=GND (left) setting data on the falling edge, and L/R Select=Vdd (right) setting data on the rising edge. This allows two microphones to be connected to form a stereo configuration over a single DATA line. The CODEC or processor can then separate the bitstreams based on their alignment with the CLK edges. Typical Application Circuit for Mono Microphone Configuration (Left Channel Selected) Document Name: VM3000_Datasheet Revision: U0.0.8 Page 5 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET Typical Application Circuit for Stereo Microphone Configuration MICROPHONE MODES The state diagram below shows the different modes and the associated current consumption. VM3000 State Diagram Document Name: VM3000_Datasheet Revision: U0.0.8 Page 6 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET TIMING SPECIFICATIONS Timing Diagram for CLK, DATA L, DATA R in Stereo Configuration Parameter Conditions Min. TCLK CLK period 303 TRISE TFALL TLOUTEN DATA L driven after falling CLK edge 31 TLOUTDIS DATA L disabled after rising CLK edge TROUTEN DATA R driven after rising CLK edge TROUTDIS DATA R disabled after falling CLK edge Max. Units 3636 nS CLK Rise Time (10%-90% level) 25 nS CLK Fall Time (90%-10% level) 25 nS 48 80 nS 9 17 30 nS 31 48 80 nS 9 17 30 nS Document Name: VM3000_Datasheet Revision: U0.0.8 Page 7 of 13 info@vespermems.com Typ. Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET TYPICAL PERFORMANCE CHARACTERISTICS a. Normalized Frequency Response c. Idd vs Clock over Vdd b. THD (%) vs dB SPL d. THD vs Clock Rate over Vdd SOLDER REFLOW PROFILE Figure 6: Solder Reflow Profile Document Name: VM3000_Datasheet Revision: U0.0.8 Page 8 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET HANDLING INSTRUCTIONS The Piezo MEMS microphone is very robust to harsh environments such as dust and moisture. However, to avoid mechanical damage to the mic we recommend using appropriate handling procedures when manually handling the parts or when using pick and place equipment. The following guidelines will avoid damage: • Do not apply a vacuum to the bottom side of the microphone. A vacuum pen may be used with care on the top side only. • Do not apply very high air pressure over the port hole. • Do not insert any large particles or objects in the port hole. The microphone is robust to small particles per IP5x specification. • Do not board wash or clean after the reflow process or expose the acoustic port to harsh chemicals. Please refer to this Application Note for Microphone Assembly Guidelines. DIMENSIONS AND PIN LAYOUT Document Name: VM3000_Datasheet Revision: U0.0.8 Pin Number Pin Name Description 1 DATA PDM Digital Output 2 L/R SELECT Left/Right Channel Select 3 NC No Connect 4 NC No Connect 5 CLK Clock 6 VDD Power Supply 7 GND Ground Page 9 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET PCB DESIGN AND LAND PATTERN LAYOUT PCB and Solder Stencil Pattern – All dimensions are in mm Lightly shaded pads are No Connect and are optional for the footprint. If they are included they should be left floating. TAPE AND REEL SPECIFICATIONS Tape and Reel specification - All dimensions in millimeters Document Name: VM3000_Datasheet Revision: U0.0.8 Page 10 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET Part Orientation in Reel (Note: Dimensions not to scale) LID MARKING Lid Marking Description Document Name: VM3000_Datasheet Revision: U0.0.8 Page 11 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET SUPPORTING DOCUMENTS VM3000_Coupon_PCB_UserGuide - Vesper VM3000 Coupon PCB board user guide VM3000_3D_Model – Vesper VM3000 3D CAD Layout AN3 – Vesper Piezoelectric MEMS Microphone Assembly Guidelines COMPLIANCE INFORMATION Electrostatic discharge (ESD) sensitive device: Although this product features industry standard protection circuitry, damage may occur if subjected to excessive ESD. Proper ESD precautions should be taken to avoid damage to the device. CONTACT DETAILS Vesper Technologies 77 Summer St Floor 8 Boston, MA 02110 Email: info@vespermems.com LEGAL INFORMATION For any questions or comments on the datasheet email: erratum@vespermems.com Information furnished by Vesper is believed to be accurate and reliable. However, no responsibility is assumed by Vesper for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Vesper. Trademarks and registered trademarks are the property of their respective owners. Document Name: VM3000_Datasheet Revision: U0.0.8 Page 12 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product. VM3000 Low Noise PDM Digital Bottom Port Piezoelectric MEMS Microphone PRELIMINARY DATASHEET REVISION HISTORY Revision Date Description 0.0.0 02/22/2019 Initial Revision 0.0.1 07/16/2019 Updated Low Power Mode Numbers, Fixed Typo Updated 3dB roll off to 100Hz nominal 0.0.2 07/29/2019 Updated performance metrics 0.0.3 08/15/2019 Added Typical Performance Curves, SELECT Functionality, Updated Tape and Reel Drawings 0.0.4 09/12/2019 Updated Device Modes Power Consumption Table 0.0.5 09/17/2019 Updated PCB Land Pattern Drawing 0.0.6 10/21/2019 Updated IPx7 rating to IPx8 Updated ESD-HBM test limit from 2kV to 4kV 0.0.7 12/29/2019 Fixed typo in Timing Table 0.0.8 1/31/2020 Updated SNR, PSRR values Updated Frequency Response and THD curves Document Name: VM3000_Datasheet Revision: U0.0.8 Page 13 of 13 info@vespermems.com Vesper reserves the right to alter the datasheet specifications without notification. Vesper assumes no liability for the use of engineering samples and offers no warranty for this product.