AKU340 - Akustica - Datasheet.Live

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 1

10Oct2014

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.

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.

Data Sheet

AKU340

Bottom Port, Analog Silicon MEMS Microphone

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 2

10Oct2014

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, HD Voice Silicon MEMS Microphone

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 pre-

amplifier, charge pump, and supporting

circuitry in a spacing saving package footprint

of 2.5 x 3.35 x 1.00 mm.

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.

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

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

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 3

10Oct2014

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

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

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 4

10Oct2014

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) 1.6V to 3.6V

3. ELECTRICAL AND ELECTRO-ACOUSTIC SPECIFICATIONS

Unless otherwise noted, test conditions are:

VDD = 2.0V Ta = 25°C RH = 50%

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Directivity

Omni-directional

Low Frequency -3dB

60

Hz

Upper Frequency +3dB

12.5

kHz

Signal to Noise Ratio

(SNR)

fin = 1kHz, A-weighted, 20Hz-

10kHz, 0dB gain

62

dB

Sensitivity1

1kHz, 94dB SPL

-40

-38

-36

dBV/Pa

Total Harmonic Distortion

(THD)1

@ 94dB SPL, fin = 1 kHz

0.5

%

@ 114dB SPL, fin = 1 kHz

5

Power Supply Rejection

Ratio (PSRR)

100mVpp, f = 217Hz

60

dB

Current Consumption1

No load

300

A

Output Impedance

150



Sensitivity loss across

voltage

Change in sensitivity over 3.6V

to 1.65V

0

dB

Polarity

Increasing sound pressure

Increasing output voltage

Note 1: Parameter 100% tested

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 5

10Oct2014

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)

4.3 Sensitivity vs. VDD

(Measured sensitivity changes relative to

supply voltage)

4.4 Total Harmonic Distortion

(Measured THD relative to speaker

output pressure level)

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 6

10Oct2014

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. PACKAGE

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

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 7

10Oct2014

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)

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

Name

Function

1

VOUT

Analog output voltage

2

GND

Ground

3

VDD

Power supply voltage for microphone

4

NC1

No Connect

5

NC1

No Connect

2.0 V

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 8

10Oct2014

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 – 120s

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.

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 9

10Oct2014

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.

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 10

10Oct2014

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)

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 11

10Oct2014

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, 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 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: A340X (A = Akustica, Part Code = 340, X = Assembly

Facility)

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

Number Processed During Work Week)

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 12

10Oct2014

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

5.

Ao = 3.83

Bo = 2.98

Ko = 1.20

Pin 1

Location

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 13

10Oct2014

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

Part

Name

Order Number1

Part Code

Package

Shipping

Method

Standard

Quantity

AKU340

02730A3401

02730A3400

A340

LGA

13” Reel

5,900

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

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= εA/d

where:

ε = the permittivity of free space

A = area of the diaphragm

d = airgap spacing

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

(1) Diaphragm

(3) Backplate

(2) Airgap

d

(1) Diaphragm

(3) Backplate

(2) Airgap

d

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 14

10Oct2014

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.

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 µParms 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.

AKU340

Analog Silicon MEMS Microphone

Data Sheet

DS26-1.03

Page 15

10Oct2014

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.

13. DOCUMENT REVISIONS

Rev. No

Description of modification/changes

Date

1.0

Updated for final. Released 1.0

30-Apr-13

1.01

Updated order numbers for new order code system, RoHS

compliance to RoHS2. Added pin identification numbers

15-Oct-13

1.02

Edited cover page. Reformatted the part description / general

description page (pg. 2). Updated AN60 footnote in section 7.

10-Feb-14

1.03

Updated headers

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

Mouser Electronics

Authorized Distributor

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AKU340