Data Sheet AKU240 Family Digital Silicon MEMS Microphones Data Sheet AKU240 Family Top port, Digital Silicon MEMS Microphones Data Sheet Part number(s) AKU240, AKU241, AKU242 Package type 8-pin LGA top port Data sheet revision 1.01 Release date 23 December 2014 Document number DS45-1.01 AKU240 Family 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. DS45-1.01 Page 1 23Dec2014 (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. AKU240 Family Digital Silicon MEMS Microphones Data Sheet AKU240 Family Digital, HD Voice Silicon MEMS Microphones General Description AKU240 family consists of HD Voice quality, top port, digital output silicon MEMS IC microphones. They are microphones consisting of a MEMS acoustic sensor, and an integrated circuit (IC) with a pre-amplifier, analog-to-digital converter, charge pump and supporting circuitry 3 in a small 4.0 x 3.0 x 1.0 mm package. The robust digital output stream from the Key Features Digital PDM output Omni-directional audio sensor Excellent acoustic performance: 63dB SNR Sensitivity: -26dBFS Tightly controlled sensitivity tolerances: o AKU240: 2dB o AKU241: 1dB o AKU242: 1.5dB (R) (R) Compatible with Microsoft Windows , (R) (R) (R) LYNC & Skype logo certifications, Intel TM (R) TM Ultrabook and Google Chromebook requirements for digital microphones Robust digital-output & Faraday-cage constructed package immune to RF/EM interference Matched microphones in frequency and phase response for array applications Output supports dual-microphone, singlewire multiplexing Industry standard microphone interface compatible with multiple codecs Low current power-down mode Lead-free surface-mountable and RoHS2 compliant Halogen-free compliance, IEC61249-2-21 Thin profile, SMT packaging 3 Industry std. package: 4.00x3.00x1.00mm AKU240 family is virtually immune to all forms of Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI), allowing designers the flexibility to integrate the component anywhere on the platform and obtain consistent SNR regardless of proximity to displays, Wi-Fi antennae, or other sources of interference that would degrade the signal of conventional analog microphones. The devices in this family provide a pulse density modulated (PDM), single-bit digital stream designed to enable the multiplexing of stereo microphone data onto a single wire. With a user selectable L/R channel option, it is ideal for use in multiple microphone applications. DS45-1.01 Typical Applications Ultrabooks Mobile phones Media tablets eReaders Microphone arrays Webcams and camera modules Page 2 23Dec2014 (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. AKU240 Family Digital Silicon MEMS Microphones Data Sheet Index of Contents 1. ABSOLUTE MAXIMUM RATINGS........................................................................................................... 4 2. STANDARD OPERATING CONDITIONS ................................................................................................ 4 3. ELECTRICAL AND ELECTRO-ACOUSTIC SPECIFICATIONS ............................................................. 4 3.1 Timing Characteristics 3.2 Digital Logic Characteristics 3.3 Sleep Mode, and Active Mode 3.4 Radio Frequency Interference (RFI) Immunity 4. DEVICE CHARACTERISTICS ..............................................................................................................7-8 4.1 Typical Frequency Response 4.2 IDD vs. VDD 4.3 Sensitivity vs. VDD 4.4 IDD vs. Clock Frequency 4.5 Sensitivity vs. Temperature 4.6 PSR vs. Frequency 6. PIN-OUT AND CONNECTION DIAGRAMS ............................................................................................. 9 6.1 Pin Out 6.2 Schematic 7. MANUFACTURING NOTES ..............................................................................................................10-12 7.1 Solder Reflow 7.2 Part Handling 7.3 PCB Land Pattern & Stencil Pattern 8. RELIABILITY SPECIFICATIONS ........................................................................................................... 13 9. PART MARKING INFORMATION .......................................................................................................... 13 10. PACKAGING INFORMATION .............................................................................................................. 14 11. ORDERING INFORMATION ................................................................................................................ 15 12. DOCUMENT REVISIONS ..................................................................................................................... 15 DS45-1.01 Page 3 23Dec2014 (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. AKU240 Family Data Sheet Digital Silicon MEMS Microphones 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 Supply Voltage (VDD) Clock Frequency -40C to 85C 1.62V to 3.6V 1.00MHz to 3.25MHz 3. ELECTRICAL AND ELECTRO-ACOUSTIC SPECIFICATIONS Unless otherwise noted, test conditions are: VDD = 1.8V Ta = 25C RH = 50% CLK = 2.4MHz Parameter Test Conditions Directivity Min. Typ. Max. Unit Omni-directional Signal to Noise Ratio (SNR) Low Frequency Corner 1 High Frequency Corner AKU240 1 Sensitivity 63 -3dB from 1kHz sensitivity value 50 +3dB from 1kHz sensitivity value 11 1kHz, 94dB SPL, full-scale = 100% 1's density at PDM output of microphone AKU241 AKU242 Total Harmonic Distortion (THD) fin = 1kHz, A-weighted, 20Hz10kHz 1 dB 100 Hz kHz -28 -26 -24 -27 -26 -25 -27.5 -26 -24.5 @ 100dB SPL, fin = 1kHz 1 @ 110dB SPL, fin = 1kHz 5 dBFS % Acoustic Overload Point (AOP) < 10% THD, fin = 1 kHz 116 dBSPL Power Supply Rejection (PSR) Signal on VDD = 217Hz, 100mVpp -73 dBFS Part-to-part phase matching from nominal fin = 1kHz Current 1 Consumption (with no load) AKU240/242 AKU241 Clock on (CLK = 2.8MHz) Clock off Power-up initialization Data invalid time from clock on Polarity Increasing sound pressure + 10 800 930 A 865 1020 A 5 7 A 28 ms Increasing 1's density Note 1: Max. value of parameter 100% tested DS45-1.01 Page 4 23Dec2014 (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. AKU240 Family Data Sheet Digital Silicon MEMS Microphones 3.1 Timing Characteristics (Typical performance with load capacitance <20pF and a clock frequency of 2.4MHz) Typical Mode Data Valid Data Sampled DATAL Left Falling clock Rising clock GND DATAR Right Rising clock Falling clock VDD t2 t4 t1 L/R SELECT Connected to t2 t3 t1 Clock DATAL DATAR Multiplexed Data Line DS45-1.01 Z Left Data Valid High Impedance High Impedance Right Data Valid Left Data Valid Output Parameter Typical Value DATAR t1 6ns DATAL t2 61ns DATAL t3 6ns DATAR t4 53ns Page 5 Z Right Data Valid Left Data Valid High Impedance Z Left Data Valid Description Time from falling edge of clock until data becomes high impedance Time from falling edge of clock until data becomes valid Time from rising edge of clock until data becomes high impedance Time from rising edge of clock until data becomes valid 23Dec2014 (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. AKU240 Family Data Sheet Digital Silicon MEMS Microphones 3.2 Digital Logic Characteristics (Typical performance with load capacitance <20pF and a clock frequency of 2.4MHz) Symbol Parameter Min VIL MAX Maximum level considered a logic 0 VIH MIN Minimum level considered a logic 1 VOL MAX Maximum level a driven output logic 0 can be VOH MIN Minimum level a driven output logic 1 can be Max Units 0.4*VDD V 0.5*VDD V 0.05*VDD 0.95*VDD V V 3.3 Sleep Mode, and Active Mode The AKU24X enters Sleep Mode within 5S of the clock signal becoming inactive (i.e. clock frequency = 0Hz). In Sleep Mode the microphone PDM Data output pin is in high impedance state. The microphone returns from Sleep Mode to Active Mode 65,536 cycles after the clock becomes active (i.e. clock frequency 1.0MHz). With a 3.072MHz clock, the microphone start-up time is 21.4ms; for a 2.4MHz clock the microphone start-up time is 27.4ms. 3.4 Radio Frequency Interference (RFI) Immunity The AKU240 family is virtually immune to all forms of Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI). Select devices in the family have additional built-in RF filter(s), as shown in the microphone block diagram below. Please refer to the ordering information table in section 11, for available device options. See ordering information table DS45-1.01 Page 6 23Dec2014 (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. AKU240 Family Data Sheet Digital Silicon MEMS Microphones 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) Normalized Microphone Output re:1kHz Mo 15 1300 1200 10 AKU24X 0 IDD (A) 1100 5 1000 AKU241 AKU240/242 900 -5 800 700 -10 10 100 1000 1 10000 1.5 2 2.5 4.3 Sensitivity vs. VDD 3.5 4 4.5 4.4 IDD vs. Clock Frequency (Measured sensitivity changes relative to supply voltage) (Measured current consumption relative to clock frequency) 950 0.5 0.4 900 0.3 850 0.2 0.1 0 -0.1 AKU24X -0.2 IDD (uA) Output (dB) VDD = 1.8V 3 VDD (V) Frequency (Hz) 800 AKU240/242 750 AKU241 700 -0.3 650 -0.4 -0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 600 0.75 VDD (V) 1.25 1.75 2.25 2.75 3.25 3.75 4.25 Clock Frequency (MHz) 4.5 Sensitivity vs. Temperature 4.6 PSR vs. Frequency (Typical sensitivity changes relative to temperature) (Typical PSR relative to frequency) 1 -65 -67 0.6 0.4 0.2 PSR (dB) Change in Sensitivity (dB) re: 25C 0.8 0 -0.2 -69 -71 AKU24X -0.4 AKU24X -0.6 -73 -0.8 -75 -1 -60 -40 -20 0 20 40 60 80 100 DS45-1.01 100 1000 10000 Frequency (Hz) Temperature (C) Page 7 23Dec2014 (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. AKU240 Family Digital Silicon MEMS Microphones Data Sheet 5. MECHANICAL SPECIFICATIONS Bottom View Top View Side View Item Dimension Tolerance Units Length (L) 4.00 0.10 mm Width (W) 3.00 0.10 mm Height (H) 1.00 0.10 mm Acoustic Port (AP) 0.400 0.10 mm Solder Mask (SRO) 0.700 0.05 mm Planarity Top/Bottom 0.10 All dimensions in mm Tolerance 0.05mm unless otherwise specified DS45-1.01 Page 8 mm 23Dec2014 (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. AKU240 Family Data Sheet Digital Silicon MEMS Microphones 6. PIN-OUT AND CONNECTION DIAGRAMS 6.1 Pin-Out (As viewed from bottom of package) 8 Pin Name 1 VDD Power 2 L/R* Left / Right Select 3 CLK Clock 4 DATA PDM Data output 5, 6, 7, 8 GND Ground 4 7 2 6 Function *Must be electrically connected to either ground or VDD. Pin 1 Indicator 6.2 Typical Application Schematic VDD VDD GND (5,6,7,8) VDD (1) GND (5,6,7,8) 0.1u F L/R SEL (2) VDD (1) 0.1u F VDD DATA (4) L/R SEL (2) CLK (3) DATA (4) CLK (3) AKU24X (LEFT) AKU24X (RIGHT) RT VDD VDD DMIC CLK DMIC IN GND Value of termination resistor (RT) is dependent on system design and location of resistor (near codec or near mic). Contact support@akustica.com for more information. Audio codec DS45-1.01 Page 9 23Dec2014 (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. AKU240 Family Data Sheet Digital Silicon MEMS Microphones 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. DS45-1.01 Page 10 23Dec2014 (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. AKU240 Family Digital Silicon MEMS Microphones 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 acoustic port of the microphone - See section 5.0 for pick & place location 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. DS45-1.01 Page 11 23Dec2014 (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. AKU240 Family Digital Silicon MEMS Microphones Data Sheet 7.3 PCB Land Pattern & Stencil Pattern PCB Land Pattern Layout Suggested Solder Paste Stencil Pattern Layout 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. DS45-1.01 Page 12 23Dec2014 (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. AKU240 Family Digital Silicon MEMS Microphones 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 A24XF WWYLL Line 1: A24XF (A = Akustica | 24X = Part Num | X = 0, 1, 2 | F = Assembly Facility) Line 2: WWYLL (WW = Work Week | Y = Year | LL = Lot Number Processed During Work Week) Pin 1 DS45-1.01 Page 13 23Dec2014 (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. AKU240 Family Data Sheet Digital Silicon MEMS Microphones 10. PACKAGING INFORMATION 10.1 Tape Specification Ao = 4.30 Bo = 3.20 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 10.2 Component Orientation A24XF WWYLL Pin 1 DS45-1.01 Page 14 23Dec2014 (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. AKU240 Family Digital Silicon MEMS Microphones Data Sheet 11. ORDERING INFORMATION Order Number 02730A0006* 02730A0007* 02730A0029 02730A0019 Sensitivity Tolerance (dB) RF Filter Part Marking +/- 2 No A240 +/- 1 +/- 1.5 Yes No A241 A242 Package Shipping Method Standard Quantity 8-Pad LGA 13" Reel 5,700 *Not recommended for new designs 12. DOCUMENT REVISIONS Rev. No 0.75 0.76 0.77 0.78 1.0 1.01 Description of modification/changes Released 0.75. Updated first page description Updated sensitivity tolerance Updated current consumption Released 1.0 Updated section 4 Date 26-Aug-14 25-Sep-14 06-Oct-14 20-Oct-14 06-Nov-14 23-Dec-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 DS45-1.01 Page 15 23Dec2014 (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: AKU242 AKU241