The MP34DB01 is an ultra-compact, low-power,
omnidirectional, digital MEMS microphone built
with a capacitive sensing element and an IC
interface with stereo operation capability.
The sensing element, capable of detecting
acoustic waves, is manufactured using a
specialized silicon micromachining process
dedicated to produce audio sensors.
The IC interface is manufactured using a CMOS
process that allows designing a dedicated circuit
able to provide a digital signal externally in PDM
format.
The MP34DB01 has an acoustic overload point of
120 dBSPL with a best on the market 62.6 dB
signal-to-noise ratio and -26 dBFS sensitivity.
The MP34DB01 is available in a bottom-port,
SMD-compliant, EMI-shielded package and is
guaranteed to operate over an extended
temperature range from -40 °C to +85 °C.
Part numberTemperature range [°C]PackagePacking
MP34DB01-40 to +85RHLGA (3x4x1) mm 4LDTray
MP34DB01TR-40 to +85RHLGA (3x4x1) mm 4LDTape and reel
July 2012Doc ID 17924 Rev 81/16
This is information on a product in full production.
Figure 7.RHLGA 3 mm x 4 mm x 1 mm 4-lead package outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4/16Doc ID 17924 Rev 8
Page 5
MP34DB01Pin description
1 Pin description
Figure 1.Pin connections
AM07238v1
Table 2.Pin description
Pin #Pin nameFunction
1CLKSynchronization input clock
2LRLeft/right channel selection
3VddPower supply
4DOUTLeft/right PDM data output
5 (ground ring)GND0 V supply
Doc ID 17924 Rev 85/16
Page 6
Acoustic and electrical specificationsMP34DB01
2 Acoustic and electrical specifications
2.1 Acoustic and electrical characteristics
The values listed in the table below are specified for Vdd = 1.8 V, Clock = 2.4 MHz,
T = 25 °C, unless otherwise noted.
Table 3.Acoustic and electrical characteristics
SymbolParameterTest conditionMin. Typ.
VddSupply voltage1.641.83.6V
Idd
IddPdn
Current consumption in
normal mode
Current consumption in
power-down mode
(3)
Mean value
(2)
SccShort-circuit current110mA
AOPAcoustic overload point120dBSPL
SoSensitivityat 1 kHz, 1 Pa-29-26 -23dBFS
SNRSignal-to-noise ratioA-weighted at 1 kHz, 1 Pa62.6dB
PSRPower supply rejectionGuaranteed by design-70dBFS
ClockInput clock frequency
TWKWake-up time
(5)
(4)
Guaranteed by design10ms
12.43.25MHz
Top Operating temperature range-40+85°C
V
V
1. Typical specifications are not guaranteed.
2. No load on DOUT line.
3. Input clock in static mode.
4. Duty cycle: min = 40% max = 60%
5. Time from the first clock edge to valid output data.
Low level logic
IOL
input/output voltage
High level logic
IOH
input/output voltage
= 1 mA-0.30.35xVddV
I
out
= 1 mA0.65xVddVdd+0.3V
I
out
(1)
Max.Unit
0.65mA
20µA
Table 4.Distortion specifications
ParameterTest conditionValue
Distortion100 dBSPL (50 Hz - 4 kHz)< 1% THD + N
Distortion115 dBSPL (1 kHz)< 5% THD + N
6/16Doc ID 17924 Rev 8
Page 7
MP34DB01Acoustic and electrical specifications
2.2 Timing characteristics
Table 5.Timing characteristics
ParameterDescriptionMinMaxUnit
f
CLK
f
PD
T
CLK
T
R,EN
T
R,DIS
T
L,EN
T
L,DIS
1. From design simulations
Clock frequency for normal mode13.25MHz
Clock frequency for power-down mode0.23MHz
Clock period for normal mode3081000ns
Data enabled on DATA line, L/R pin = 130
Data disabled on DATA line, L/R pin = 116
Data enabled on DATA line, L/R pin = 030
Data disabled on DATA line, L/R pin = 016
Figure 2.Timing waveforms
CLK
T
R,EN
PDM R
T
R,DIS
High Z
(1)
(1)
(1)
(1)
T
CLK
T
L,DIS
High Z
ns
ns
ns
ns
PDM L
T
L,EN
High Z
High Z
AM045165v1
Doc ID 17924 Rev 87/16
Page 8
Acoustic and electrical specificationsMP34DB01
2.3 Frequency response
Figure 3.Typical frequency response normalized at 1 kHz
10
8
6
4
2
0
-2
Normalized Sensitivity [dB]
-4
-6
-8
-10
10 100 1000 10000
Frequency [Hz]
Table 6.Frequency response mask for digital microphones
Frequency / Hz
20...100-5+5dBr 1kHz
100...8000-2+2dBr 1kHz
8000...20000-5+5dBr 1kHz
1. At T = 20 °C and acoustic stimulus = 1 Pa (94 dB SPL).
(1)
Lower limitUpper limitUnit
AM045317v1
8/16Doc ID 17924 Rev 8
Page 9
MP34DB01Sensing element
3 Sensing element
The sensing element shall mean the acoustic sensor consisting of a conductive movable
plate and a fixed plate placed in a tiny silicon chip. This sensor transduces the sound
pressure into the changes of coupled capacity between those two plates.
Omron Corporation supplies this element for STMicroelectronics.
Doc ID 17924 Rev 89/16
Page 10
Absolute maximum ratingsMP34DB01
4 Absolute maximum ratings
Stresses above those listed as “absolute maximum ratings” may cause permanent damage
to the device. This is a stress rating only and functional operation of the device under these
conditions is not implied. Exposure to maximum rating conditions for extended periods may
affect device reliability.
Table 7.Absolute maximum ratings
SymbolRatingsMaximum valueUnit
VddSupply voltage-0.3 to 6V
VinInput voltage on any control pin -0.3 to Vdd +0.3V
T
ESDElectrostatic discharge protection2 (HBM)kV
Storage temperature range-40 to +125°C
STG
This device is sensitive to mechanical shock, improper handling can cause
permanent damage to the part.
This device is ESD-sensitive, improper handling can cause permanent damage to the
part.
10/16Doc ID 17924 Rev 8
Page 11
MP34DB01Functionality
5 Functionality
5.1 L/R channel selection
The L/R digital pad lets the user select the DOUT signal pattern as explained in Tab l e 8 . The
L/R pin must be connected to Vdd or GND.
Table 8.L/R channel selection
L/RCLK lowCLK high
GNDData validHigh impedance
VddHigh impedanceData valid
Doc ID 17924 Rev 811/16
Page 12
Application recommendationsMP34DB01
6 Application recommendations
Figure 4.MP34DB01 electrical connections
CODEC
CLK
DOUT
Vdd
100 nF
1
L/R
4
2
3
10 µF
5
Top view
Figure 5.MP34DB01 electrical connections for stereo configuration
CODEC
CLK
DOUT
AM07964v1
Vdd
Mic1
1
4
2
3
5
Top view
100 nF
10 µF
Power supply decoupling capacitors (100 nF ceramic, 10 µF ceramic) should be placed as
near as possible topin 3 of the device (common design practice).
The L/R pin must be connected to Vdd or GND (refer to Tab le 8 ).
12/16Doc ID 17924 Rev 8
Mic2
1
4
2
3
5
Top view
AM07965v1
Page 13
MP34DB01Package mechanical data
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK is an ST trademark.
Soldering information
The RHLGA (3 x 4 x 1) mm package is also compliant with the RoHS and “Green” standards
and is qualified for soldering heat resistance according to JEDEC J-STD-020.
Landing pattern and soldering recommendations are available at www.st.com.
Figure 6.Recommended soldering profile limits
t
p
T
P
T
L
TEMPERATURE
RAMP-UP
T
SMAX
T
SMIN
t
s
PREHEAT
RAMP-DOWN
t
L
CRITICAL ZONE
TLto T
P
T25°C to PEAK
30 60 90 120 150 180 210 240 270 300 330 360 390
Table 9.Recommended soldering profile limits
TIME
DescriptionParameterPb free
Average ramp rateTL to T
P
3 °C/sec max
Preheat
Minimum temperature
Maximum temperature
Time (T
SMIN
to T
SMAX
)
Ramp-up rateT
T
T
SMAX
Time maintained above liquidous temperature
Liquidous temperature
Peak temperatureT
SMIN
SMAX
t
S
to T
t
L
T
L
P
L
150 °C
200 °C
60 sec to 120 sec
60 sec to 150 sec
217 °C
260 °C max
Time within 5 °C of actual peak temperature20 sec to 40 sec
Ramp-down rate6 °C/sec max
Time 25 °C (t25 °C) to peak temperature8 minutes max
Doc ID 17924 Rev 813/16
AM045166v1
Page 14
Package mechanical dataMP34DB01
Figure 7.RHLGA 3 mm x 4 mm x 1 mm 4-lead package outline
E1
C
KC
A1
K
Seating Plane
TOP VIEW
E
E
K
D
KD
//
K
1
D
Bottom Port Indicator
Table 10.RHLGA 3 mm x 4 mm x 1 mm 4-lead package dimensions
M
1
L
1
N
1
G
2
X
G
6
7
G
mm
Symbol
MinTypMax
A10.9001.0001.100
D13.9004.0004.100
D20.9501.0001.050
R10.3500.4000.450
E12.9003.0003.100
E21.4501.5001.550
L10.6500.7000.750
L20.8500.9000.950
N11.0001.0501.100
N20.4000.4500.500
T10.3500.4000.450
T20.5500.6000.650
G13.0503.1003.150
G23.7503.8003.850
G32.0502.1002.150
G42.7502.8002.850
G50.2500.3000.350
G60.0500.1000.150
G70.5000.5500.600
G80.8000.8500.900
M0.100
K0.050
T2
L2
N2
4
3
1
R
E2
G3
G4
BOTTOM VIEW
T2
1
2
G5xG5 Pin 1 Indicator
2
D
G
8
1
T
1
T
2
G
8178743_E
14/16Doc ID 17924 Rev 8
Page 15
MP34DB01Revision history
8 Revision history
Table 11.Document revision history
DateRevisionChanges
28-Mar-20111Initial release
05-Apr-20112Updated Ta b le 3 and Ta b le 5
21-Oct-20113 Added max. peak temperature T
18-Nov-20114
04-Jan-20125
20-Mar-20126
07-May-20127Added V
05-Jul-20128
Updated SNR typical value in Ta bl e 3 ; document promoted from
preliminary to full datasheet
Updated Features and Description
Updated Figure 3: Typical frequency response normalized at 1 kHz
Added test condition criterion to PSR in Table 3: Acoustic and
electrical characteristics
, V
IOL
to Table 3: Acoustic and electrical characteristics
IOH
Added Section 3: Sensing element
Updated operating temperature range throughout datasheet
to Ta b le 9
P
Doc ID 17924 Rev 815/16
Page 16
MP34DB01
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY TWO AUTHORIZED ST REPRESENTATIVES, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.