ANALOG DEVICES ADMP441 Service Manual

Omnidirectional Microphone with

Data Sheet

FEATURES

Digital I²S interface with high precision 24-bit data
High SNR of 61 dBA
High sensitivity of −26 dBFS
Flat frequency response from 60 Hz to 15 kHz
Low current consumption of 1.4 mA
High PSR of −75 dBFS
Small 4.72 mm × 3.76 mm × 1 mm surface-mount package
Compatible with Sn/Pb and Pb-free solder processes
RoHS/WEEE compliant

APPLICATIONS

Teleconferencing systems
Gaming consoles
Mobile devices
Laptops
Tab le ts
Security systems

Bottom Port and I2S Digital Output

ADMP441

FUNCTIONAL BLOCK DIAGRAM

ADMP441

GND

FILTER

HARDWARE

CONTROL

CHIPEN

Figure 1.

I2S

SERIAL

PORT

L/R

SCK

SD

WS

09568-001

09568-015

ADC

POWER

MANAGEMENT

DD

V

GND

GND

BOTTOM TOP

Figure 2. Isometric Views of ADMP441 Microphone Package

GENERAL DESCRIPTION

The ADMP4411 is a high performance, low power, digital output,
omnidirectional MEMS microphone with a bottom port. The
complete ADMP441 solution consists of a MEMS sensor, signal
conditioning, an analog-to-digital converter, antialiasing filters,
power management, and an industry standard 24-bit IS inter­face. The IS interface allows the ADMP441 to connect directly
to digital processors, such as DSPs and microcontrollers, with­out the need for an audio codec in the system.

1

Protected by U.S. Patents 7,449,356; 7,825,484; 7,885,423; and 7,961,897. Other patents are pending.

The ADMP441 has a high SNR and high sensitivity, making it
an excellent choice for far field applications. The ADMP441 has
a flat wideband frequency response, resulting in natural sound
with high intelligibility. A built-in particle filter provides high
reliability.

The ADMP441 is available in a thin 4.72 mm × 3.76 mm ×
1 mm surface-mount package. It is reflow solder compatible
with no sensitivity degradation. The ADMP441 is halide free.

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2011–2012 Analog Devices, Inc. All rights reserved.

ADMP441 Data Sheet

TABLE OF CONTENTS

Features.............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

IS Digital Input/Output.............................................................. 4

Timing Diagram........................................................................... 4

Absolute Maximum Ratings............................................................ 5

ESD Caution.................................................................................. 5

Pin Configuration and Function Descriptions............................. 6

Typical Performance Characteristics ............................................. 7

Theory of Operation ........................................................................ 8

REVISION HISTORY

1/12—Rev. 0 to Rev. A

Changes to Circuit Note Title ....................................................... 11

Updated Outline Dimensions....................................................... 13

Deleted Figure 18............................................................................ 13

10/11—Revision 0: Initial Version

Understanding Sensitivity............................................................8

Power Management ......................................................................8

Startup.............................................................................................8

IS Data Interface ..........................................................................8

Digital Filter Characteristics..................................................... 10

Applications Information.............................................................. 11

Power Supply Decoupling......................................................... 11

Handling Instructions................................................................ 11

Supporting Documentation...................................................... 11

Layout and Design Recommendations........................................ 12

Outline Dimensions....................................................................... 13

Ordering Guide .......................................................................... 13

Rev. A | Page 2 of 16

Data Sheet ADMP441

SPECIFICATIONS

TA = 25°C, VDD = 2.4 V, SCK = 3.072 MHz, SPL = 104 dB (3.16 Pa rms), unless otherwise noted. All minimum and maximum
specifications are guaranteed. Typical specifications are not guaranteed.

Table 1.

Parameter Symbol Test Conditions/Comments Min Typ Max Unit

PERFORMANCE

Directionality Omni
Sensitivity at 94 dB SPL1 1 kHz, 104 dB SPL −29 −26 −23 dBFS
Signal-to-Noise Ratio SNR 20 kHz bandwidth, A-weighted 61 dBA
Equivalent Input Noise EIN 20 kHz bandwidth, A-weighted 33 dBA SPL
Dynamic Range Derived from EIN and maximum acoustic input 87 dB
Frequency Response2 Low frequency –3 dB point 60 Hz
High frequency –3 dB point 15 kHz
Deviation limits from flat response within pass band −3/+2 dB
Total Harmonic Distortion THD 104 dB SPL 3 %
Power Supply Rejection PSR 217 Hz, 100 mV p-p square wave superimposed on VDD −75 dBFS
Maximum Acoustic Input Peak 120 dB SPL
Noise Floor 20 Hz to 20 kHz, A-weighted, rms −87 dBFS

POWER SUPPLY

Supply Voltage VDD 1.8 3.3 V
Supply Current IDD

VDD = 1.8 V

Normal Mode 1.4 1.6 mA
Standby 0.8 mA
Power-Down 2 µA

VDD = 3.3 V

Normal Mode 2.2 2.5 mA
Standby 0.8 mA
Power-Down 4.5 µA

DIGITAL FILTER

Group Delay 17.25/fS sec
f
f
Pass-Band Ripple ±0.04 dB
Stop-Band Attenuation 60 dB
Pass Band 0.423 × fS 20.3 kHz

1

The peak-to-peak amplitude is relative to peak-to-peak amplitude of 224 − 1. The stimulus is a 104 dB SPL sinusoid having rms amplitude of 3.1623 Pa. Sensitivity is

relative to 1 Pa.

2

See Figure 6 and Figure 8.

= 48 kHz 359 µs

S

= 16 kHz 1078 µs

S

Rev. A | Page 3 of 16

ADMP441 Data Sheet

K

I²S DIGITAL INPUT/OUTPUT

–40°C < TA < +85°C, 1.8 V < VDD < 3.3 V, unless otherwise noted.

Table 2.

Limit1
Parameter Symbol Test Conditions/Comments Min Max Unit

DIGITAL INPUT

Voltage Input Low (L/R, WS, SCK) VIL 0
Voltage Input High (L/R, WS, SCK) VIH 0.7 × VDD VDD V

SD DIGITAL OUTPUT

Voltage Output Low VOL V
Voltage Output Low VOL V
Voltage Output High VOH V
Voltage Output High VOH V
Voltage Output Low VOL V
Voltage Output Low VOL V
Voltage Output High VOH V
Voltage Output High VOH V

1

Limits based on characterization results; not production tested.

= 1.8 V, I

DD

= 1.8 V, I

DD

= 1.8 V, I

DD

= 1.8 V, I

DD

= 3.3 V, I

DD

= 3.3 V, I

DD

= 3.3 V, I

DD

= 3.3 V, I

DD

= 0.25 mA 0.1 × VDD V

SINK

= 0.7 mA 0.3 × VDD V

SINK

= 0.7 mA 0.7 × VDD V

SINK

= 0.25 mA 0.9 × VDD V

SINK

= 0.5 mA 0.1 × VDD V

SINK

= 1.7 mA 0.3 × VDD V

SINK

= 1.7 mA 0.7 × VDD V

SINK

= 0.5 mA 0.9 × VDD V

SINK

Table 3. Serial Data Port Timing Specifications

Parameter Description Min Max Unit

t

SCK high 50 ns

SCH

t

SCK low 50 ns

SCL

t

SCK period 312 ns

SCP

f

SCK

t

WS setup 0 ns

WSS

t

WS hold 20 ns

WSH

SCK frequency 0.5 3.2 MHz

fWS WS frequency 7.8 49.3 kHz

0.25 × VDD

V

TIMING DIAGRAM

SC

WS

SD

t

WSS

t

SCP

t

SCH

t

SCL

t

WSH

09568-103

Figure 3. Serial Data Port Timing

Rev. A | Page 4 of 16

Data Sheet ADMP441

A

E

A

ABSOLUTE MAXIMUM RATINGS

Table 4.

Parameter Rating

Supply Voltage (VDD) −0.3 V to +3.6 V
Sound Pressure Level 160 dB
Mechanical Shock 10,000 g
Vibration

Per MIL-STD-883 Method

2007, Test Condition B
Operating Temperature Range −40°C to +85°C
Digital Pin Input Voltage

−0.3 V to V

+ 0.3 V or 3.6 V,

DD

whichever is less

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

ESD CAUTION

LZON

CRITIC

TLTO T

P

t

L

09568-002

T

T

TURE

TEMPER

t

P

L

T

SMAX

T

SMIN

PREHEAT

t

25°C

t

S

RAMP-UP

TO PEAK

P

RAMP-DOWN

TIME

Figure 4. Recommended Soldering Profile Limits

Table 5. Recommended Soldering Profile Limits

Profile Feature Sn63/Pb37 Pb-Free

Average Ramp Rate (TL to TP) 1.25°C/sec max 1.25°C/sec max
Preheat

Minimum Temperature (T
Maximum Temperature (T
Time (T

Ramp-Up Rate (T

SMIN

to T

), tS 60 sec to 75 sec 60 sec to 75 sec

SMAX

to TL) 1.25°C/sec 1.25°C/sec

SMAX

) 100°C 100°C

SMIN

) 150°C 200°C

SMAX

Time Maintained Above Liquidous (tL) 45 sec to 75 sec ~50 sec

Liquidous Temperature (TL) 183°C 217°C
Peak Temperature (TP) 215°C +3°C/−3°C 260°C +0°C/−5°C
Time Within 5°C of Actual Peak Temperature (tP) 20 sec to 30 sec 20 sec to 30 sec
Ramp-Down Rate 3°C/sec max 3°C/sec max
Time 25°C (t

) to Peak Temperature 5 minute max 5 minute max

25°C

Rev. A | Page 5 of 16