Data Sheet AKU342 Analog Silicon MEMS Microphone Data Sheet AKU342 Bottom port, Analog Silicon MEMS Microphone Data Sheet Part number(s) AKU342 Package type 6-pin LGA bottom port Data sheet revision 1.04 Release date 10 October 2014 Document number DS28-1.04 AKU342 Data Sheet Notes Specifications are subject to change without notice. Product photos and pictures are for illustration purposes only and may differ from the real product's appearance. DS28-1.04 Page 1 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Analog Silicon MEMS Microphone Data Sheet AKU342 Analog, HD Voice Silicon MEMS Microphone General Description AKU342 is an HD Voice quality, bottom port, analog output silicon MEMS IC microphone. It is an integrated circuit (IC) consisting of a MEMS acoustic sensor, a pre-amplifier, charge pump, and supporting circuitry in an industry standard package footprint of 2.95mm x 3.76mm x 1.00mm. Key Features Bottom port, Analog output Omni-directional audio sensor Excellent acoustic performance: 63dB SNR Tight sensitivity tolerance: -38dB +/- 2 dB Matched microphones in frequency and phase response for array applications Flat frequency response for superwideband audio Package immune to RF/EM interference Lead-free, surface-mountable and RoHS2 compliant Halogen-free in accordance with IEC612492-21 Thin profile, SMT packaging Industry-standard package of: 2.95 x 3.76 x 3 1.00 mm Typical Applications Smartphones and mobile phones which require high quality acoustic performance in a small form factor microphone Digital still/video cameras IC / digital voice recorders Portable media players Gaming consoles / controllers Voice activated entertainments systems and remote controllers Smart-home sensor hubs / clusters, and IoTS acoustic sensor nodes Microphone arrays - multi-mic applications and noise cancellation algorithms which benefit from microphones with tightly matched sensitivity and phase Products designed to capture superwideband audio that require a microphone with less than 5dB variation in frequency response from 50Hz-14kHz Other small, thin consumer electronic devices using more than one microphone Designed specifically to meet the demanding requirements of mobile handset OEMs, AKU342 offers excellent acoustic performance with 63dB signal-to-noise ratio (SNR) and tight sensitivity matching of just +/-2dB between microphones. It also offers a flat wideband frequency response with less than 5dB variations from 50 Hz to 14 kHz, delivering uniform audio capture across a broad audio spectrum. The AKU342 metal lid package is immune to RF and Electromagnetic (EM) interferences, allowing for easy integration into wireless devices. DS28-1.04 Page 2 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Analog Silicon MEMS Microphone Data Sheet Index of Contents 1. ABSOLUTE MAXIMUM RATINGS........................................................................................................... 4 2. STANDARD OPERATING CONDITIONS ................................................................................................ 4 3. ELECTRICAL AND ACOUSTIC SPECIFICATIONS ............................................................................... 4 4. DEVICE CHARACTERISTICS ................................................................................................................. 5 4.1 Typical Frequency Response 4.2 IDD vs. VDD 4.3 Sensitivity vs. VDD 4.4 Total Harmonic Distortion 4.5 Sensitivity vs. Temperature 4.6 PSRR vs. Frequency 5. MECHANICAL SPECIFICATIONS ........................................................................................................... 6 6. PIN-OUT AND CONNECTION DIAGRAMS ............................................................................................. 7 6.1 Pin Out 6.2 Schematic 7. MANUFACTURING NOTES ...............................................................................................................8-10 7.1 Solder Reflow 7.2 Part Handling 7.3 PCB Land Pattern & Stencil Pattern 8. RELIABILITY SPECIFICATIONS ........................................................................................................... 11 9. PART MARKING INFORMATION .......................................................................................................... 11 10. PACKAGING INFORMATION .............................................................................................................. 12 11. ORDERING INFORMATION ................................................................................................................ 13 12. DOCUMENT REVISIONS ..................................................................................................................... 13 DS28-1.04 Page 3 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Data Sheet Analog Silicon MEMS Microphone 1. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD to GND 5.5V ESD Tolerance Human Body Model Machine Model 2000V 200V Storage Temperature Range -40C to 105C 2. STANDARD OPERATING CONDITIONS Operating Temperature Range Supply Voltage (VDD) -40C to 85C 1.6V to 3.6V 3. ELECTRICAL AND ACOUSTIC SPECIFICATIONS Unless otherwise noted, test conditions are: VDD = 2.0V Ta = 25C RH = 50% Parameter Test Conditions Directivity Min. Typ. Max. Unit Omni-directional Signal to Noise Ratio (SNR) fin = 1 kHz, A-weighted, 20Hz-10kHz 63 dB Low Frequency Corner -3dB from 1kHz sensitivity value 60 Hz Upper Frequency Corner +3dB from 1kHz sensitivity value 10 kHz 1 Sensitivity 1kHz, 94dB SPL Total Harmonic Distortion 1 (THD) @ 94dB SPL, fin = 1 kHz 1 @ 114dB SPL, fin = 1 kHz 5 Power Supply Rejection Ratio (PSRR) Current Consumption 1 -40 100mVpp, f = 217Hz -38 60 Output Impedance Change in sensitivity over 3.6V to 1.6V Part-to-part phase matching From nominal @ 1kHz Polarity Increasing sound pressure dBV/Pa % dB No load Sensitivity loss across voltage -36 300 A 200 0 dB 10 Increasing output voltage Note 1: Parameter 100% tested DS28-1.04 Page 4 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Data Sheet Analog Silicon MEMS Microphone 4. DEVICE CHARACTERISTICS 4.1 Frequency Response 4.2 IDD vs. VDD (Measured current consumption relative to supply voltage) 350 15 325 10 300 5 IDD, (A) Normalized Microphone Output re:1kHz Mo (Measured frequency response normalized to 1kHz) 0 275 250 225 200 -5 175 150 -10 10 100 1000 1 10000 1.5 2 2.5 3 3.5 4 4.5 VDD, (V) Frequency, (Hz) 4.3 Sensitivity vs. VDD 4.4 Total Harmonic Distortion (Measured sensitivity changes relative to supply voltage) (Measured THD relative to speaker output pressure level) 20 0.5 0.3 15 0.2 THD, (%) Output(dB), VDD = 1.8V 0.4 0.1 0 -0.1 -0.2 10 5 -0.3 -0.4 0 -0.5 1.6 2.1 2.6 3.1 3.6 Speaker Output Pressure, (dBSPL) VDD, (V) 4.5 Sensitivity vs. Temperature 4.6 PSRR vs. Frequency (Typical sensitivity changes relative to temperature) (Typical PSRR relative to frequency) 0.6 0.5 0.4 0.3 0.2 0.1 -1E-15 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 Change in Sensitivity, re: 25C 70 PSRR (dB) 60 40 30 -60 -40 -20 0 20 40 60 80 100 Temperature, (C) DS28-1.04 50 100 1000 10000 100000 Frequency, (Hz) Page 5 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Data Sheet Analog Silicon MEMS Microphone 5. MECHANICAL SPECIFICATIONS Top View Bottom View 2 1 6 5 3 4 Side View 3 2 4 1 Item Dimension Tolerance Units Length (L) 3.76 0.10 mm Width (W) 2.95 0.10 mm Height (H) 1.00 0.10 mm Acoustic Port (AP) 0.30 0.03 mm Planarity Top/Bottom 0.05 mm All dimensions in mm Tolerance 0.05mm unless otherwise specified DS28-1.04 Page 6 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Data Sheet Analog Silicon MEMS Microphone 6. PIN-OUT AND CONNECTION DIAGRAMS 6.1 Pin-Out (As viewed from bottom of package) 4 5 6 3 Pin Name 1 OUT 2 GND 3 NC/GND 4 VDD 5, 6 GND Function Analog output voltage Ground 1 No Connect or Ground Power supply voltage for microphone Ground Note 1: Pin 2 must be Ground. Pin 3 can be left as No Connect or tied to Ground. 6.2 Typical Application Schematic DS28-1.04 Page 7 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Data Sheet Analog Silicon MEMS Microphone 7. MANUFACTURING NOTES 7.1 Solder Reflow Typical solder reflow profile Average ramp-up rate max. 3C/s Time ts between Tsmin (150C) and Tsmax (200C) 60s - 120s Time tL above liquidous temperature TL (217C) 60s - 90s Peak temperature TP max. 260C Time tP at TP max. 20s Average ramp-down rate max. 6C/s Note: It is recommended to fine-tune the reflow process to optimize for variations in materials, environment, handling, PCB board size and thickness, etc. Please refer to AN60-Handling, Soldering, and Mounting Instructions for more detailed information and precautions. DS28-1.04 Page 8 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Analog Silicon MEMS Microphone Data Sheet 7.2. Microphone Handling Although the microphone may not appear damaged immediately due to inappropriate handling, there can be long term effects that affect the lifetime of the component. Rule of thumb: The microphone is an artificial ear so treat it like your own ear. Do not blow air into the acoustic port of the microphone for any reason. Do not subject it to pressurized air - e.g. when cleaning the board or other components on the same board Do not apply vacuum to the acoustic port of the microphone Do not insert liquids - If populated circuit boards are washed, the microphone must be protected Do not insert dust - The production facilities must be clean - e.g. if PCB routing/sawing is done close to the microphone after SMT assembly and reflow Do not insert any objects - If assembly or rework is done manually, care must be taken that the tools cannot enter the microphone sound port - It is best to choose tool size so that it does not fit through the sound port of the microphone Do not cover the acoustic port with tape when heating during assembly or reflow Do not apply extreme mechanical stresses on the microphone, including mechanical shocks above 10kG or compression of the microphone package. After a bottom port microphone has been assembled on a circuit board, protect the sound port (now on the other side of the board) from dust, liquids, and other foreign materials as well as any tools and pressurized air. ESD Handling Procedures Follow CMOS handling procedures with Akustica MEMS microphones. Handle the microphone with proper workplace grounding to include wrist straps and ionized airflow over open trays and reels of microphones. Do not hot-swap/hot-plug during testing. Device pins have ESD ratings of 2kV/200V for HBM/MM respectively. DS28-1.04 Page 9 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Analog Silicon MEMS Microphone Data Sheet 7.3 PCB Land Pattern and Stencil Pattern PCB Land Pattern Layout 1 5 Suggested Solder Paste Stencil Pattern Layout 4 6 2 3 Acoustic port (PCB must be drilled here) Note: Stencil printer settings will likely require minor optimizations when transferring this stencil pattern to a high volume production printer. Please refer to AN60-Handling, Soldering, and Mounting Instructions for more detailed information and precautions. DS28-1.04 Page 10 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Analog Silicon MEMS Microphone Data Sheet 8. RELIABILITY SPECIFICATIONS The microphone sensitivity after stress must deviate by no more than 3dB from the initial value. Test Test Condition 1 Cold Temp Operation Temperature = -40C, 1000 hours (with bias) 2 Hot Temp Operation Temperature = 105C, 1000 hours (with bias) 3 Humidity Operation Temperature = 85C, RH = 85%, 1000 hours (with bias) 4 Cold Temp Storage Temperature = -40C, 1000 hours (without bias) 5 Hot Temp Storage Temperature = 105C, 1000 hours (without bias) 6 Humidity Storage Temperature = 85C, RH = 85%, 1000 hours (without bias) 7 Thermal Cycle 100 Cycles, -40C to +125C, 15min soaks, <30sec ramps 8 Vibration Sinusoidal Vibration, 20Hz-2000Hz, 4min sweeps, 16min along each of 3 axis, amplitude 3 limits of 20G and 0.06" 9 Mechanical Shock 10,000G shocks, 5 impacts along each of 6 axes 10 Drop Test 11 ESD (HBM) 12 ESD (MM) 13 ESD +/- 8kV, contact discharge to lid with DUT grounded 14 Moisture Sensitivity Level 24 hour bake at 125C, followed by 168 hours at 85C, 85%RH, followed by 3 passes solder reflow (MSL Level 1) Using 150gm aluminum fixture, 3 drops along each of 6 axes (total 18 drops) from 1.5m height onto concrete drop surface. +/-2000V, 1 discharge for each polarity, 11 pin combinations, 22 total discharges per microphone +/- 200V, 1 discharge for each polarity, 11 pin combinations, 22 total discharges per microphone 9. PART MARKING INFORMATION Acoustic Port Line 1: A342X (A = Akustica, Part Code = 342, X = Assembly Facility) Line 2: WWYLL (WW = Work Week, Y = Year, LL = Lot Number Processed During Work Week) DS28-1.04 Page 11 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Analog Silicon MEMS Microphone Data Sheet 10. PACKAGING INFORMATION 10.1 Tape Specification Ao = 4.16 Bo = 3.40 Ko = 1.30 Notes: 1. 10 sprocket hole pitch cumulative tolerance +/-0.2 2. Camber in compliance with EIA-481 3. Pocket position relative to sprocket hole measured as true position of pocket, not pocket hole 4. Ao and Bo are calculated on a plane at a distance of "R" above the bottom of the pocket. 10.2 Component Orientation Pin 1 Location DS28-1.04 Page 12 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. AKU342 Data Sheet Analog Silicon MEMS Microphone 11. ORDERING INFORMATION Part Number Order Number Part Code Package Shipping Method Standard Quantity AKU342 02730A0008 02730A3003 A342 6-Pad LGA 13" Reel 5,700 1 Note 1: Please contact Akustica to determine the appropriate order number when placing an order. 12. DOCUMENT REVISIONS Rev. No Description of modification/changes Date 1.0 Updated for final. Released 1.0. 13-Jun-13 1.01 Updated order number to 3003 from 0003. 23-Aug-13 1.02 1.03 1.04 Updated order numbers for new order code system. RoHS compliance to RoHS2. Added pin identification numbers Edited cover page. Reformatted the part description / general description page (pg. 2). Updated footnote regarding AN60 in section 7. Updated headers and PCB layout AP 15-Oct-13 10-Feb-14 10-Oct-14 Akustica, Inc. 2835 E Carson St. Suite 301 Pittsburgh, PA / USA 15203 (412) 390-1730 sales@akustica.com www.akustica.com/contact.asp Modifications reserved | Printed in USA Specifications subject to change without notice DS28-1.04 Page 13 10Oct2014 (c) Akustica, Inc. reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. Bosch Group and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. 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