Data Sheet AKU340 Analog Silicon MEMS Microphone Data Sheet AKU340 Bottom Port, Analog Silicon MEMS Microphone Datasheet Part number(s) AKU340 Package type LGA, bottom port, metal lid Data sheet revision 1.03 Release date 10 October 2014 Document number DS26-1.03 AKU340 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. DS26-1.03 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. AKU340 Analog Silicon MEMS Microphone Data Sheet AKU340 Analog, HD Voice Silicon MEMS Microphone Key Features Bottom port, Analog output Omni-directional microphone High SNR: 62 dB Tight sensitivity tolerance: -38 dB +/- 2 dB Matched microphones in frequency and phase response for array applications Flat frequency response: +/- 3dB 60Hz - 12.5kHz Package immune to RF/EM interference Lead-free, surface-mountable and RoHS2 compliant Halogen-free in accordance with IEC61249-2-21 Thin profile, SMT packaging Industry-standard, small form factor package of: 2.5 x 3.35 x 1.00 mm General Description The AKU340 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 preamplifier, charge pump, and supporting circuitry in a spacing saving package footprint of 2.5 x 3.35 x 1.00 mm. Typical Applications Smartphones & Mobile handsets Tablet computers Speaker phones Digital still/video cameras Bluetooth & wired headsets Portable media players IC / digital voice recorders 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 Other small, thin consumer electronic devices using more than one microphone Designed specifically to meet the demanding requirements of mobile handset OEMs, the AKU340 offers excellent acoustic performance with 62dB 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 3dB variations from 60Hz to 12.5kHz, delivering uniform audio capture across a broad audio spectrum. The AKU340 metal lid package is immune to RF and Electromagnetic (EM) interferences, allowing for easy integration into wireless devices. DS26-1.03 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. AKU340 Analog Silicon MEMS Microphone Data Sheet Index of Contents 1. ABSOLUTE MAXIMUM RATINGS ........................................................................................................... 4 2. STANDARD OPERATING CONDITIONS ................................................................................................ 4 3. ELECTRICAL AND ELECTRO-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 5. PACKAGE ................................................................................................................................................ 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 ................................................................................................................. 12 12. REFERENCE MATERIALS ............................................................................................................. 13-14 12.1 Application Notes 12.2 Theory of Operation 12.3 Measurement Guidelines 12.4 Glossary of Terms 13. DOCUMENT REVISIONS ..................................................................................................................... 14 DS26-1.03 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. AKU340 Data Sheet Analog Silicon MEMS Microphone 1. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD to GND ESD Tolerance Human Body Model Machine Model Storage Temperature Range 5.5V 2000V 200V -40C to 105C 2. STANDARD OPERATING CONDITIONS Operating Temperature Range @ 2V Supply Voltage (VDD) -40C to 85C 1.6V to 3.6V 3. ELECTRICAL AND ELECTRO-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 Low Frequency -3dB Upper Frequency +3dB Signal to Noise Ratio (SNR) 1 fin = 1kHz, A-weighted, 20Hz10kHz, 0dB gain Hz 12.5 kHz 62 dB Sensitivity 1kHz, 94dB SPL Total Harmonic Distortion 1 (THD) @ 94dB SPL, fin = 1 kHz 0.5 @ 114dB SPL, fin = 1 kHz 5 Power Supply Rejection Ratio (PSRR) 1 Current Consumption 100mVpp, f = 217Hz -40 60 -38 -36 60 300 Sensitivity loss across voltage Change in sensitivity over 3.6V to 1.65V Polarity Increasing sound pressure % dB No load Output Impedance dBV/Pa A 150 0 dB Increasing output voltage Note 1: Parameter 100% tested DS26-1.03 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. AKU340 Analog Silicon MEMS Microphone Data Sheet 4. DEVICE CHARACTERISTICS 4.1 Frequency Response 4.2 IDD vs. VDD (Measured frequency response normalized to 1kHz) (Measured current consumption relative to supply voltage) 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) DS26-1.03 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. AKU340 Data Sheet Analog Silicon MEMS Microphone 5. PACKAGE Bottom View 3 Top View Side View 1 3 5 4 1 2 4 5 Item Dimension Tolerance Units Length (L) 3.35 0.10 mm Width (W) 2.50 0.10 mm Height (H) 1.00 0.10 mm Acoustic Port (AP) 0.35 0.05 mm Planarity Top/Bottom 0.05 mm All dimensions in mm Tolerance 0.05mm unless otherwise specified DS26-1.03 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. AKU340 Data Sheet Analog Silicon MEMS Microphone 6. PIN-OUT AND CONNECTION DIAGRAMS 6.1 Pin-Out (As viewed from bottom of package) Pin Name Function 1 VOUT Analog output voltage 2 GND Ground 3 VDD 4 NC 1 No Connect 5 NC 1 No Connect Power supply voltage for microphone Note 1: Pins 4 & 5 can be connected to improve reflow manufacturability, but are not necessary. If used, Pins 4 & 5 should be tied to GROUND. 6.2 Typical Application Schematic 2.0 V DS26-1.03 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. AKU340 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. DS26-1.03 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. AKU340 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 mic 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. DS26-1.03 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. AKU340 Analog Silicon MEMS Microphone Data Sheet 7.3 PCB Land Pattern & Stencil Pattern PCB Land Pattern Layout Suggested Solder Paste Stencil Pattern Layout 3 1 2 5 4 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. DS26-1.03 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. AKU340 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, 20-2000Hz, 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 Using 150gm aluminum fixture, 3 drops along each of 6 axes (total 18 drops) from 1.5m height onto concrete drop surface. 11 ESD (HBM) +/-2000V, 1 discharge for each polarity, 11 pin combinations, 22 total discharges per microphone 12 ESD (MM) +/- 200V, 1 discharge for each polarity, 11 pin combinations, 22 total discharges per microphone 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) 9. PART MARKING INFORMATION Line 1: A340X (A = Akustica, Part Code = 340, X = Assembly Facility) Line 2: WWYLL (WW = Work Week, Y = Year, LL= Lot Number Processed During Work Week) DS26-1.03 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. AKU340 Analog Silicon MEMS Microphone Data Sheet 10. PACKAGING INFORMATION 10.1 Tape Specification Ao = 3.83 Bo = 2.98 Ko = 1.20 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 "R" above the bottom of the pocket 10.2 Component Orientation 5. Pin 1 Location DS26-1.03 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. AKU340 Data Sheet Analog Silicon MEMS Microphone 11. ORDERING INFORMATION Part Name Order Number Part Code Package Shipping Method Standard Quantity AKU340 02730A3401 02730A3400 A340 LGA 13" Reel 5,900 1 Note 1: Please contact Akustica to determine the appropriate order number when placing an order. 12. REFERENCE MATERIALS 12. 1 Application Notes AN60 - Handling, Soldering, and Mounting Instructions AN48 - AKU340 Coupon Board App Note 12.2 Theory of Operation (2) Airgap The AKU340 analog output microphone is a condenser microphone which has a structure consisting of a diaphragm (1) and a backplate (3), separated by an air gap (2), forming a parallel plate capacitor as shown. The nominal capacitance of the microphone can be determined by C= A/d where: d (3) Backplate = the permittivity of free space A = area of the diaphragm d = airgap spacing (1) Diaphragm Sound pressure impinges on the diaphragm. The deflection of the diaphragm in response to sound causes the capacitance to vary. The variable capacitance is converted into an analog voltage signal which is amplified by the on-chip output amplifier. 12.3 Measurement Information Measuring Signal to Noise Ratio The Signal to Noise Ratio (SNR) is the ratio of the output due to a 1 kHz, 94 dB SPL input signal to the Noise Floor of the microphone. It is measured at the output of the on-chip output amplifier. To measure the noise floor, the microphone is placed in a sound isolation box. The power spectral density (PSD) is measured and A-weighted. The A-weighted PSD is integrated over the audio band. The square root of the integrated value is the output Noise Floor of the microphone. Both the SNR and Noise Floor are usually quoted in dB. 12.4 Glossary of Terms DS26-1.03 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. AKU340 Analog Silicon MEMS Microphone Data Sheet A-weighting: The A-weighting filter is designed to approximate the variation in human ear sensitivity over the audio band at low sound pressure levels and is used to improve the correlation of a measured device noise level to the noise level perceived by the human ear. dB (Decibel): A decibel (dB) is ten times the logarithm of a power ratio of two quantities. For linear quantities such as pressure and voltage, the decibel level is calculated using the formula dB = 20*log(Value1/Value2). Value1 is usually a measured quantity and Value2 is usually a standard reference quantity that is measurement dependent. In order to calibrate a specification given in dB, you must know the reference value. Frequency Response: The frequency response indicates the sensitivity of the microphone over a given frequency range. 12.4 Glossary of Terms (cont.) Sound Pressure Level (SPL): The sound pressure level is an expression of loudness in dB SPL. The reference value is 20 Parms which is the lower threshold of hearing of a healthy human ear at 1 kHz. A sound pressure of 1 Parms corresponds to a sound pressure level of 94 dB SPL. As a reference, the sound pressure level of a noisy office environment would be roughly 75 dB SPL. Power Supply Rejection Ratio (PSRR): The PSRR supplies a quantitative measurement of how ripples in the power supply voltage affect the output voltage of a component. It is calculated as the ratio of the power supply voltage change to the output voltage change of the component. DS26-1.03 Page 14 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. AKU340 Data Sheet Analog Silicon MEMS Microphone 13. DOCUMENT REVISIONS Rev. No 1.0 1.01 1.02 1.03 Description of modification/changes Date Updated for final. Released 1.0 30-Apr-13 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 AN60 footnote in section 7. Updated headers 15-Oct-13 10-Feb-14 10-Oct-14 Akustica, Inc. 2835 E Carson St. Suite 301 Pittsburgh, PA / USA 15203 sales@akustica.com www.akustica.com Modifications reserved | Printed in USA Specifications subject to change without notice DS26-1.03 Page 15 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. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Akustica: AKU340