AKU344 - Akustica - Datasheet.Live

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 1

12Dec2014

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.

Data Sheet

Part number(s)

AKU344

Package type

LGA, bottom port, metal lid

Data sheet revision

1.01

Release date

12 December 2014

Document number

DS36-1.01 AKU344 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.

AKU344

Bottom Port, Analog Silicon MEMS Microphone

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 2

12Dec2014

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.

AKU344

Analog, HD Voice Silicon MEMS Microphone

General Description

The AKU344 is an HD Voice quality, bottom

port, analog output MEMS semiconductor

microphone. It is a microphone consisting of a

MEMS acoustic sensor, and an integrated

circuit (IC) with a pre-amplifier, charge pump,

and supporting circuitry in a spacing saving

package footprint of 2.5 x 3.35 x 1.00 mm3.

Designed specifically to meet the demanding

requirements of mobile handset OEMs, the

AKU344 offers excellent acoustic performance

with 65dB signal-to-noise ratio (SNR), and

uniform sensitivity matching of just +1dB

between microphones. . It also offers a flat

wideband frequency response with less than

5dB variations from 50Hz to 14kHz, delivering

uniform audio capture across a broad audio

spectrum. The AKU344 metal lid package is

immune to RF and Electromagnetic (EM)

interferences, allowing for easy integration into

wireless devices.

Key Features

 Bottom port, Analog output

 Omni-directional silicon microphone

 High SNR: 65dB

 Tight sensitivity tolerance: -42dB + 1dB

 Matched microphones in frequency and

phase response for array applications

 Flat frequency response for super-

wideband audio

 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: 2.5x3.35x1.00mm3

 Built-in support for 2-wire mode

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 uniform microphones

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 3

12Dec2014

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.

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

5. PACKAGE ................................................................................................................................................ 6

6. PIN-OUT AND CONNECTION DIAGRAMS ............................................................................................. 7

6.1 Pin Out

6.2 Typical Application Schematic

6.2.1 3-wire mode application diagram

6.2.2 2-wire mode application diagram

7. MANUFACTURING NOTES ..................................................................................................................... 8

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

13. DOCUMENT REVISIONS ..................................................................................................................... 14

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 4

12Dec2014

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.

1. ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VDD to GND 5.5V

ESD Tolerance

Human Body Model 2000V

Machine Model 200V

Storage Temperature Range -40°C to 105°C

2. STANDARD OPERATING CONDITIONS

Operating Temperature Range @ 2V -40°C to 85°C

Supply Voltage (VDD) 1.62V to 3.6V

3. ELECTRICAL AND ELECTRO-ACOUSTIC SPECIFICATIONS

Unless otherwise noted, test conditions are:

VDD = 2.0V Ta = 25°C RH = 50% Mode = 3-wire

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Directivity

Omni-directional

Signal to Noise Ratio (SNR)

fin = 1kHz, A-weighted

65

dB

Low Frequency Corner1

-3dB from 1kHz sensitivity value

80

100

Hz

Upper Frequency Corner

+3dB from 1kHz sensitivity value

11

kHz

Sensitivity1

1kHz, 94dBSPL

-43

-42

-41

dBV/Pa

Total Harmonic Distortion1

(THD)

@ 94dBSPL, fin = 1kHz

1

%

@ 115dBSPL, fin = 1kHz

3

Acoustic Overload Point

(AOP)

< 10% THD, fin = 1kHz

126

dBSPL

Power Supply Rejection

Ratio (PSRR)

100mVpp, f = 217Hz

55

dB

Current Consumption1

No load

155

170

A

Output Impedance

200



Sensitivity loss across

voltage

Change in sensitivity over 3.6V

to 1.62V

0.75

dB

Polarity

Increasing sound pressure

Increasing output voltage

Note 1: Max./min. value of parameter 100% tested

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 5

12Dec2014

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.

4. DEVICE CHARACTERISTICS

4.1 Frequency Response

(Measured frequency response normalized to

1kHz)

4.2 IDD vs. VDD

(Measured current consumption relative to supply

voltage)

-15

-10

-5

0

5

10

15

10.0 100.0 1000.0 10000.0

Normalized Microphone Output re:1kHz Mo

Frequency (Hz)

100.0

150.0

200.0

250.0

1 1.5 2 2.5 3 3.5 4 4.5

IDD (µA)

VDD (V)

4.3 Sensitivity vs. VDD

(Measured sensitivity changes relative to supply

voltage)

-3

-2

-1

0

1

2

3

1 1.5 2 2.5 3 3.5 4 4.5 5

Output (dB) VDD = 2.0V

VDD (V)

4.4 Total Harmonic Distortion

(Measured THD relative to speaker output

pressure level)

0

5

10

15

20

25

THD, (%)

Speaker Output Pressure, (dBSPL)

4.5 Sensitivity vs. Temperature

(Typical sensitivity changes relative to

temperature)

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

-60 -40 -20 020 40 60 80 100

Change in Sensitivity (dB) re: 25C

Temperature (ºC)

4.6 PSRR vs. Frequency

(Typical PSRR relative to frequency)

20

30

40

50

60

70

10 100 1000 10000

PSR (dB)

Frequency (Hz)

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 6

12Dec2014

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.

5. MECHANICAL SPECIFICATIONS

Bottom View Top View Side View

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

1

5

4

2

3

1

5

4

3

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 7

12Dec2014

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.

6. PIN-OUT AND CONNECTION DIAGRAMS

6.1 Pin-Out

(As viewed from bottom of package)

Name

Function

1

VOUT

Analog output voltage

2

GND

Ground

3

VDD

Power supply voltage

4

GND

Ground

5

GND

Ground

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 8

12Dec2014

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.

6.2 Typical Application Schematic

6.2.1 3-wire mode application diagram*

6.2.2 2-wire mode application diagram

2.0V

*All testing performed in 3-wire mode.

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 9

12Dec2014

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.

7. MANUFACTURING NOTES

7.1. Solder Reflow

Typical solder reflow profile

Average ramp-up rate

max. 3°C/s

Time ts between Tsmin (150°C) and Tsmax (200°C)

60s – 12s

Time tL above liquidous temperature TL (217°C)

60s – 90s

Peak temperature TP

max. 260°C

Time tP at TP

max. 20s

Average ramp-down rate

max. 6°C/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.

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 10

12Dec2014

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.

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.

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 11

12Dec2014

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.

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.

1

5

4

2

3

Acoustic port (PCB must be drilled here)

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 12

12Dec2014

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.

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 = -40°C, 1000 hours (with bias)

2

Hot Temp Operation

Temperature = 105°C, 1000 hours (with bias)

3

Humidity Operation

Temperature = 85°C, RH = 85%, 1000 hours (with bias)

4

Cold Temp Storage

Temperature = -40°C, 1000 hours (without bias)

5

Hot Temp Storage

Temperature = 105°C, 1000 hours (without bias)

6

Humidity Storage

Temperature = 85°C, RH = 85%, 1000 hours (without bias)

7

Thermal Cycle

100 Cycles, -40°C to +125°C, 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

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 125°C, followed by 168 hours at 85°C, 85%RH,

followed by 3 passes solder reflow (MSL Level 1)

9. PART MARKING INFORMATION

Line 1: A344X (A = Akustica | 344 = Part Num | X = Assembly Facility)

Line 2: WWYLL (WW = Work Week | Y = Year | LL= Lot Number

Processed During Work Week)

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 13

12Dec2014

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.

10. PACKAGING INFORMATION

10.1 Tape Specification

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

Ao = 3.83

Bo = 2.98

Ko = 1.20

Pin 1

Location

AKU344

Analog Silicon MEMS Microphone

Data Sheet

DS36-1.01

Page 14

12Dec2014

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.

11. ORDERING INFORMATION

Order Number

Part

Marking

Package

Shipping Method

Standard Quantity

02730A3403

A344

LGA

13” Reel

5,900

For more information, sample requests or to place an order, please contact Akustica.

12. DOCUMENT REVISIONS

Rev. No

Description of modification/changes

Date

0.75

Released preliminary datasheet

21-Feb-14

0.76

Updated description section and 2-wire mode.

06-Mar-14

0.77

Added AOP value to section 3. Updated 2-wire mode diagram.

06-May-14

0.78

Updated section 6.1 – pin out description

13-May-14

0.79

Updated stencil drawing for acoustic port hole

17-Oct-14

1.0

Released 1.0

12-Nov-14

1.01

Updated section 3

12-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

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

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AKU344