MP34DB01
MEMS audio sensor omnidirectional digital microphone
Datasheet
−
production data
Features
■
■
■
■
■
■
■
■
Single supply voltage
Low power consumption
120 dBSPL acoustic overload point
62.6 dB signal-to-noise ratio
Omnidirectional sensitivity
–26 dBFS sensitivity
PDM single-bit output with option for stereo configuration
RHLGA package
– Bottom-port design
– SMD-compliant
– EMI-shielded
– ECOPACK
®
, RoHS and “Green” compliant
Applications
■
■
■
■
■
■
■
■
■
Mobile terminals
Laptop and notebook computers
Portable media players
VoIP
Speech recognition
A/V eLearning devices
Gaming and virtual reality input devices
Digital still and video cameras
Antitheft systems
RHLGA 3x4x1 4LD
Description
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.
Table 1.
Device summary
Part number Temperature range [°C]
MP34DB01
MP34DB01TR
-40 to +85
-40 to +85
Package
RHLGA (3x4x1) mm 4LD
RHLGA (3x4x1) mm 4LD
Packing
Tray
Tape and reel
July 2012
This is information on a product in full production.
Doc ID 17924 Rev 8 1/16 www.st.com
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Contents
Contents
MP34DB01
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Acoustic and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
Acoustic and electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1
L/R channel selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Application recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16 Doc ID 17924 Rev 8
MP34DB01
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Acoustic and electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Distortion specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Frequency response mask for digital microphones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
L/R channel selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 9.
Recommended soldering profile limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 10.
RHLGA 3 mm x 4 mm x 1 mm 4-lead package dimensions . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 11.
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Doc ID 17924 Rev 8 3/16
List of figures
List of figures
MP34DB01
Figure 1.
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2.
Timing waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3.
Typical frequency response normalized at 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
MP34DB01 electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5.
MP34DB01 electrical connections for stereo configuration . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6.
Recommended soldering profile limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7.
RHLGA 3 mm x 4 mm x 1 mm 4-lead package outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4/16 Doc ID 17924 Rev 8
MP34DB01
Figure 1.
Pin connections
Pin description
Table 2.
Pin #
Pin description
Pin name
1
2
3
4
5 (ground ring)
CLK
LR
Vdd
DOUT
GND
Synchronization input clock
Left/right channel selection
Power supply
Left/right PDM data output
0 V supply
Function
AM07238v1
Doc ID 17924 Rev 8 5/16
Acoustic and electrical specifications
2 Acoustic and electrical specifications
MP34DB01
2.1 Acoustic and electrical characteristics
Table 3.
Symbol
The values listed in the table below are specified for Vdd = 1.8 V, Clock = 2.4 MHz,
T = 25 °C, unless otherwise noted.
Acoustic and electrical characteristics
Parameter
Vdd Supply voltage
Idd
Current consumption in normal mode
IddPdn
Scc
Current consumption in power-down mode
(3)
Short-circuit current
AOP Acoustic overload point
So Sensitivity
SNR Signal-to-noise ratio
PSR Power supply rejection
Clock Input clock frequency
(4)
TWK Wake-up time
(5)
Test condition
Mean value
(2) at 1 kHz, 1 Pa
A-weighted at 1 kHz, 1 Pa
Guaranteed by design
Guaranteed by design
Min.
1.64
1
-29
1
-40
Typ.
(1)
1.8
0.65
20
120
-26
62.6
-70
2.4
Max.
3.6
10
-23
3.25
10
+85
Unit
V mA
µA mA dBSPL dBFS dB dBFS
MHz ms
°C
V
V
IOL
IOH
Low level logic input/output voltage
High level logic input/output voltage
I
I out out
= 1 mA
= 1 mA
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.
-0.3
0.65xVdd
0.35xVdd
Vdd+0.3
V
V
Table 4.
Distortion specifications
Parameter Test condition
Distortion
Distortion
100 dBSPL (50 Hz - 4 kHz)
115 dBSPL (1 kHz)
Value
< 1% THD + N
< 5% THD + N
6/16 Doc ID 17924 Rev 8
MP34DB01 Acoustic and electrical specifications
Table 5.
Parameter
Timing characteristics
Description f
CLK f
PD
T
CLK
T
R,EN
T
R,DIS
T
L,EN
T
L,DIS
Clock frequency for normal mode
Clock frequency for power-down mode
Clock period for normal mode
Data enabled on DATA line, L/R pin = 1
Data disabled on DATA line, L/R pin = 1
Data enabled on DATA line, L/R pin = 0
Data disabled on DATA line, L/R pin = 0
1.
From design simulations
Figure 2.
Timing waveforms
T
CLK
Min
1
308
30
(1)
30
(1)
CLK
PDM R
PDM L
T
R,EN
T
R,DIS
High Z
T
L,DIS
High Z
T
L,EN
High Z
High Z
Max
3.25
0.23
1000
16
(1)
16
(1)
Unit
MHz
MHz ns ns ns ns ns
AM045165v1
Doc ID 17924 Rev 8 7/16
Acoustic and electrical specifications MP34DB01
Figure 3.
Typical frequency response normalized at 1 kHz
10
4
2
0
-2
-8
-10
-4
-6
8
6
Frequency [Hz]
Table 6.
Frequency response mask for digital microphones
Frequency / Hz
(1)
Lower limit Upper limit
20...100
100...8000
-5
-2
8000...20000
-5
1.
At T = 20 °C and acoustic stimulus = 1 Pa (94 dB SPL).
+5
+2
+5
AM045317v1
Unit dBr 1kHz dBr 1kHz dBr 1kHz
8/16 Doc ID 17924 Rev 8
MP34DB01 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 8 9/16
Absolute maximum ratings
4 Absolute maximum ratings
MP34DB01
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.
Symbol
Absolute maximum ratings
Ratings
Vdd Supply voltage
Vin Input voltage on any control pin
T
STG
Storage temperature range
ESD Electrostatic discharge protection
Maximum value
-0.3 to 6
-0.3 to Vdd +0.3
-40 to +125
2 (HBM)
Unit
V
V
°C kV
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.
10/16 Doc ID 17924 Rev 8
MP34DB01
5 Functionality
5.1
Functionality
L/R channel selection
The L/R digital pad lets the user select the DOUT signal pattern as explained in
Table 8 . The
L/R pin must be connected to Vdd or GND.
Table 8.
L/R channel selection
L/R
GND
Vdd
CLK low
Data valid
High impedance
CLK high
High impedance
Data valid
Doc ID 17924 Rev 8 11/16
Application recommendations MP34DB01
Figure 4.
MP34DB01 electrical connections
C ODE C
Vdd
L/R
1
2
4
3
5 Top view
100 nF
10 µF
Figure 5.
MP34DB01 electrical connections for stereo configuration
C ODE C
Vdd
AM07964v1
Mic1
1
2
4
3
5 Top view
Mic2
1
2
4
3
5 Top view
100 nF
12/16
10 µF
AM07965v1
Power supply decoupling capacitors (100 nF ceramic, 10 µF ceramic) should be placed as near as possible to pin 3 of the device (common design practice).
The L/R pin must be connected to Vdd or GND (refer to
Table 8 ).
Doc ID 17924 Rev 8
MP34DB01
7 Package mechanical data
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
RAMP-UP
CRITICAL ZONE
T
L to T
P
T
L
T
SMAX t
L
T
SMIN ts
PREHEAT
RAMP-DOWN
T25°C to PEAK
TIME
30 60 90 120 150 180 210 240 270 300 330 360 390
Table 9.
Recommended soldering profile limits
Description Parameter
Average ramp rate
Preheat
Minimum temperature
Maximum temperature
Time (T
SMIN
to T
SMAX
)
Ramp-up rate
Time maintained above liquidous temperature
Liquidous temperature
Peak temperature
Time within 5 °C of actual peak temperature
Ramp-down rate
Time 25 °C (t25 °C) to peak temperature
T
L
to T
P
T
SMIN
T
SMAX t
S
T
SMAX
to T
L t
L
T
L
T
P
AM045166v1
Pb free
3 °C/sec max
150 °C
200 °C
60 sec to 120 sec
60 sec to 150 sec
217 °C
260 °C max
20 sec to 40 sec
6 °C/sec max
8 minutes max
Doc ID 17924 Rev 8 13/16
Package mechanical data MP34DB01
Figure 7.
RHLGA 3 mm x 4 mm x 1 mm 4-lead package outline
E1
C
K E
// K C
K
M
D
K E
Seating Plane
4
3
T2
L2
N2
T2
1
2
2XG
6
G5xG5 Pin 1 Indicator
Bottom Port Indicator
K D
A1
G7
E2
1
R
G3
G4
BOTTOM VIEW
G
8
TOP VIEW
G1
G2
G3
G4
N1
N2
T1
T2
E1
E2
L1
L2
A1
D1
D2
R1
G5
G6
G7
G8
M
K
Table 10.
RHLGA 3 mm x 4 mm x 1 mm 4-lead package dimensions mm
Symbol
Min Typ
1.000
0.400
0.350
0.550
3.050
3.750
2.050
2.750
0.900
3.900
0.950
0.350
2.900
1.450
0.650
0.850
0.250
0.050
0.500
0.800
1.050
0.450
0.400
0.600
3.100
3.800
2.100
2.800
1.000
4.000
1.000
0.400
3.000
1.500
0.700
0.900
0.300
0.100
0.550
0.850
0.100
0.050
Max
1.100
0.500
0.450
0.650
3.150
3.850
2.150
2.850
1.100
4.100
1.050
0.450
3.100
1.550
0.750
0.950
0.350
0.150
0.600
0.900
8178743_E
14/16 Doc ID 17924 Rev 8
MP34DB01 Revision history
Table 11.
Document revision history
Date Revision
28-Mar-2011
05-Apr-2011
21-Oct-2011
18-Nov-2011
04-Jan-2012
20-Mar-2012
07-May-2012
05-Jul-2012
1
2
3
4
5
6
7
8
Changes
Initial release
Updated
Table 3 and
Table 5
Added max. peak temperature T
P
to
Table 9
Updated SNR typical value in
Table 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
Added V
IOL
, V
IOH
to Table 3: Acoustic and electrical characteristics
Added
Section 3: Sensing element
Updated operating temperature range throughout datasheet
Doc ID 17924 Rev 8 15/16
MP34DB01
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16/16 Doc ID 17924 Rev 8
