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Omnidirectional Microphone with Bottom Port and I
GENERAL DESCRIPTION
The INMP441 is a high-performance, low power, digital-output,
omnidirectional MEMS microphone with a bottom port. The
complete INMP441 solution consists of a MEMS sensor, signal
conditioning, an analog-to-digital converter, anti-aliasing filters,
power management, and an industry-standard 24-bit I²S interface.
The I²S interface allows the INMP441 to connect directly to digital
processors, such as DSPs and microcontrollers, without the need
for an audio codec in the system.
The INMP441 has a high SNR, making it an excellent choice for
near field applications. The INMP441 has a flat wideband
frequency response, resulting in natural sound with high
intelligibility.
The INMP441 is available in a thin 4.72 × 3.76 × 1 mm surface-
mount package. It is reflow- solder compatible with no sensitivity
degradation. The INMP441 is halide free.
*Protected by U.S. Patents 7,449,356; 7,825,484; 7,885,423; and 7,961,897.
Other patents are pending.
FUNCTIONAL BLOCK DIAGRAM
ADC
POWER
HARDWARE
MANAGEMENT
CONTROL
InvenSense reserves the right to change the detail
specifications as may be required to permit improvements
in the design of its products.
INMP441
FILTER
SCK
2
I
S
SERIAL
SD
PORT
WS
1745 Technology Drive, San Jose, CA 95110 U.S.A
APPLICATIONS
•
Teleconferencing Systems
•
Remote Controls
•
Gaming Consoles
•
Mobile Devices
•
Laptops
Tablets
•
•
Security Systems
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 × 3.76 × 1 mm Surface-Mount Package
•
Compatible with Sn/Pb and Pb-Free Solder Processes
•
RoHS/WEEE Compliant
ORDERING INFORMATION
PART
INMP441ACEZ-R0*
INMP441ACEZ-R7†
EV_INMP441
EV_INMP441-FX
* – 13" Tape and Reel
† – 7" Tape and reel to be discontinued. Contact
availability.
BOTTOM
InvenSense Inc.
+1(408) 988–7339
www.invensense.com
INMP441
2
S Digital Output
TEMP RANGE
−40°C to +85°C
−40°C to +85°C
—
—
sales@invensense.com
TOP
Document Number: DS-INMP441-00
Revision: 1.1
Rev Date: 05/21/2014
for
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Summary of Contents for InvenSense INMP441
-
Page 1: General Description
High Sensitivity of -26 dBFS • Flat Frequency Response from 60 Hz to 15 kHz The INMP441 is available in a thin 4.72 × 3.76 × 1 mm surface- • Low Current Consumption of 1.4 mA mount package. It is reflow- solder compatible with no sensitivity •... -
Page 2: Table Of Contents
Digital Microphone Sensitivity ..........................12 Synchronizing Microphones ............................ 13 Digital Filter Characteristics ............................. 13 High-Pass Filter ................................ 13 Table 7. High Pass Filter Characteristics ........................13 Low-Pass Filter ................................. 13 Applications Information ..............................15 Page 2 of 21 Document Number: DS-INMP441-00 Revision: 1.1... - Page 3 Handling Instructions ..............................18 Pick And Place Equipment ............................18 Reflow Solder ................................18 Board Wash................................18 Outline Dimensions ................................. 19 Ordering Guide ................................ 20 Revision History ............................... 20 Compliance Declaration Disclaimer ......................... 21 Page 3 of 21 Document Number: DS-INMP441-00 Revision: 1.1...
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Page 4: Specifications
Note 1: The peak-to-peak amplitude relative to peak-to-peak amplitude of (2 − 1.) The stimulus is a 104 dB SPL sinusoid having RMS amplitude of 3.1623 Pa. Sensitivity is relative to 1 Pa. Note 2: See Figure 4 and Figure 5. Page 4 of 21 Document Number: DS-INMP441-00 Revision: 1.1... -
Page 5: Timing Diagram
TABLE 3. SERIAL DATA PORT TIMING SPECIFICATIONS PARAMETER CONDITIONS UNITS NOTES SCK high SCK low SCK period SCK frequency WS setup WS hold WS frequency TIMING DIAGRAM Figure 1. Serial Data Port Timing Page 5 of 21 Document Number: DS-INMP441-00 Revision: 1.1... -
Page 6: Absolute Maximum Ratings
ESD. Therefore proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Page 6 of 21 Document Number: DS-INMP441-00 Revision: 1.1... -
Page 7: Soldering Profile
Time +25°C (t ) to Peak Temperature 5 min max 25°C *The reflow profile in Table 5 is recommended for board manufacturing with InvenSense MEMS microphones. All microphones are also compatible with the J-STD-020 profile. Page 7 of 21 Document Number: DS-INMP441-00... -
Page 8: Pin Configurations And Function Descriptions
Microphone Enable. When set low (ground), the microphone is disabled and put in power- CHIPEN down mode. When set high (VDD), the microphone is enabled. Ground. Connect to ground on the PCB. Page 8 of 21 Document Number: DS-INMP441-00 Revision: 1.1... -
Page 9: Typical Performance Characteristics
FREQUENCY (Hz) FREQUENCY (Hz) Figure 4. Frequency Response Mask Figure 5. Typical Frequency Response (Measured) –10 –20 –30 –40 –50 –60 –70 –80 FREQUENCY (Hz) Figure 6. Power-Supply Rejection (PSR) vs. Frequency Page 9 of 21 Document Number: DS-INMP441-00 Revision: 1.1... -
Page 10: Theory Of Operation
(whose specification is easily confirmed with an oscilloscope), the digital microphone output has no obvious unit of measure. The INMP441 has a nominal sensitivity of −26 dBFS at 1 kHz with an applied sound pressure level of 94 dB. The units are in decibels referred to full scale. -
Page 11: I²S Data Interface
The L/R control pin determines whether the INMP441 outputs data in the left or right channel. For a stereo application, the SD pins of the left and right INMP441 microphones should be tied together as shown in Figure 7. The format of a stereo I²S data stream is shown in Figure 8. -
Page 12: Digital Microphone Sensitivity
The definition of a 0 dBFS signal must be understood when measuring the sensitivity of the INMP441. An acoustic input signal of a 1 kHz sine wave at 94 dB SPL applied to the INMP441 results in an output signal with a −26 dBFS level. This means that the output digital word peaks at −26 dB below the digital full-scale level. -
Page 13: Synchronizing Microphones
−0.5 dB 21.6 Hz −0.1 dB This digital filter response is in addition to the natural high-pass response of the INMP441 MEMS acoustic transducer that has a -3 dB cutoff of 60 Hz. LOW-PASS FILTER The analog-to-digital converter in the INMP441 is a single-bit, high-order, sigma-delta (Σ-Δ) running at a high oversampling ratio. The noise shaping of the converter pushes the majority of the noise well above the audio band and gives the microphone a wide dynamic range. - Page 14 INMP441 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 NORMALIZED FREQUENCY ( Figure 12. Digital Low-Pass Filter Magnitude Response Page 14 of 21 Document Number: DS-INMP441-00 Revision: 1.1...
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Page 15: Applications Information
Thermal connections to the ground planes should be made on the far side of the capacitor, as shown in Figure 13. CAPACITOR TO V TO GND Figure 13. Recommended Power-Supply Bypass Capacitor Layout Page 15 of 21 Document Number: DS-INMP441-00 Revision: 1.1... -
Page 16: Supporting Documents
AN-1003, Recommendations for Mounting and Connecting the Invensense, Inc., Bottom-Ported MEMS Microphones AN-1068, Reflow Soldering of the MEMS Microphone AN-1112, Microphone Specifications Explained AN-1124, Recommendations for Sealing Invensense, Inc., Bottom-Port MEMS Microphones from Dust and Liquid Ingress AN-1140, Microphone Array Beamforming Page 16 of 21 Document Number: DS-INMP441-00... -
Page 17: Pcb Design And Land Pattern Layout
PCB. Figure 15 shows a suggested solder paste stencil pattern layout. The response of the INMP441 is not affected by the PCB hole size, as long as the hole is not smaller than the sound port of the micro- phone (0.25 mm, or 0.010 inch, in diameter). -
Page 18: Pcb Material And Thickness
PCB MATERIAL AND THICKNESS The performance of the INMP441 is not affected by PCB thickness. The INMP441 can be mounted on either a rigid or flexible PCB. A flexible PCB with the microphone can be attached directly to the device housing with an adhesive layer. This mounting method offers a reliable seal around the sound port while providing the shortest acoustic path for good sound quality. -
Page 19: Outline Dimensions
4.72 mm × 3.76 mm × 1.00 mm Body Dimensions shown in millimeters PART NUMBER PIN 1 INDICATION YY XXXX DATE CODE LOT TRACEABILITY CODE Figure 17. Package Marking Specification (Top View) Page 19 of 21 Document Number: DS-INMP441-00 Revision: 1.1... -
Page 20: Ordering Guide
* – 13” Tape and Reel † – 7” Tape and reel to be discontinued. Contact sales@invensense.com for availability. REVISION HISTORY REVISION DATE REVISION DESCRIPTION 02/06/2014 Initial Release 05/21/2014 Updated Compliance Disclaimer Page 20 of 21 Document Number: DS-INMP441-00 Revision: 1.1... -
Page 21: Compliance Declaration Disclaimer
This information furnished by InvenSense is believed to be accurate and reliable. However, no responsibility is assumed by InvenSense for its use, or for any infringements of patents or other rights of third parties that may result from its use. Specifications are subject to change without notice.
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