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MEMS audio sensor omnidirectional digital microphone
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
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
Table 1. Device summary
®
, RoHS and “Green” compliant
MP34DB01
Datasheet − production data
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.
Part number Temperature range [°C] Package Packing
MP34DB01 -40 to +85 RHLGA (3x4x1) mm 4LD Tray
MP34DB01TR -40 to +85 RHLGA (3x4x1) mm 4LD Tape and reel
July 2012 Doc ID 17924 Rev 8 1/16
This is information on a product in full production.
www.st.com
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Contents MP34DB01
Contents
1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Acoustic and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Acoustic and electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 L/R channel selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 Application recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16 Doc ID 17924 Rev 8
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MP34DB01 List of tables
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3. Acoustic and electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Distortion specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 5. Timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 6. Frequency response mask for digital microphones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 7. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 8. 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
Page 4
List of figures MP34DB01
List of figures
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
Page 5
MP34DB01 Pin description
1 Pin description
Figure 1. Pin connections
AM07238v1
Table 2. Pin description
Pin # Pin name Function
1 CLK Synchronization input clock
2 LR Left/right channel selection
3 Vdd Power supply
4 DOUT Left/right PDM data output
5 (ground ring) GND 0 V supply
Doc ID 17924 Rev 8 5/16
Page 6
Acoustic and electrical specifications MP34DB01
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
Symbol Parameter Test condition Min. Typ.
Vdd Supply voltage 1.64 1.8 3.6 V
Idd
IddPdn
Current consumption in
normal mode
Current consumption in
power-down mode
(3)
Mean value
(2)
Scc Short-circuit current 1 10 mA
AOP Acoustic overload point 120 dBSPL
So Sensitivity at 1 kHz, 1 Pa -29 -26 -23 dBFS
SNR Signal-to-noise ratio A-weighted at 1 kHz, 1 Pa 62.6 dB
PSR Power supply rejection Guaranteed by design -70 dBFS
Clock Input clock frequency
TWK Wake-up time
(5)
(4)
Guaranteed by design 10 ms
1 2.4 3.25 MHz
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 -0.3 0.35xVdd V
I
out
= 1 mA 0.65xVdd Vdd+0.3 V
I
out
(1)
Max. Unit
0.65 mA
20 µA
Table 4. Distortion specifications
Parameter Test condition Value
Distortion 100 dBSPL (50 Hz - 4 kHz) < 1% THD + N
Distortion 115 dBSPL (1 kHz) < 5% THD + N
6/16 Doc ID 17924 Rev 8
Page 7
MP34DB01 Acoustic and electrical specifications
2.2 Timing characteristics
Table 5. Timing characteristics
Parameter Description Min Max Unit
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 mode 1 3.25 MHz
Clock frequency for power-down mode 0.23 MHz
Clock period for normal mode 308 1000 ns
Data enabled on DATA line, L/R pin = 1 30
Data disabled on DATA line, L/R pin = 1 16
Data enabled on DATA line, L/R pin = 0 30
Data disabled on DATA line, L/R pin = 0 16
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 8 7/16
Page 8
Acoustic and electrical specifications MP34DB01
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 +5 dBr 1kHz
100...8000 -2 +2 dBr 1kHz
8000...20000 -5 +5 dBr 1kHz
1. At T = 20 °C and acoustic stimulus = 1 Pa (94 dB SPL).
(1)
Lower limit Upper limit Unit
AM045317v1
8/16 Doc ID 17924 Rev 8
Page 9
MP34DB01 Sensing 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 8 9/16
Page 10
Absolute maximum ratings MP34DB01
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
Symbol Ratings Maximum value Unit
Vdd Supply voltage -0.3 to 6 V
Vin Input voltage on any control pin -0.3 to Vdd +0.3 V
T
ESD Electrostatic discharge protection 2 (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.
10/16 Doc ID 17924 Rev 8
Page 11
MP34DB01 Functionality
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/R CLK low CLK high
GND Data valid High impedance
Vdd High impedance Data valid
Doc ID 17924 Rev 8 11/16
Page 12
Application recommendations MP34DB01
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 to pin 3 of the device (common design practice).
The L/R pin must be connected to Vdd or GND (refer to Tab le 8 ).
12/16 Doc ID 17924 Rev 8
Mic2
1
4
2
3
5
Top view
AM07965v1
Page 13
MP34DB01 Package 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
Description Parameter Pb free
Average ramp rate TL to T
P
3 °C/sec max
Preheat
Minimum temperature
Maximum temperature
Time (T
SMIN
to T
SMAX
)
Ramp-up rate T
T
T
SMAX
Time maintained above liquidous temperature
Liquidous temperature
Peak temperature T
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 temperature 20 sec to 40 sec
Ramp-down rate 6 °C/sec max
Time 25 °C (t25 °C) to peak temperature 8 minutes max
Doc ID 17924 Rev 8 13/16
AM045166v1
Page 14
Package mechanical data MP34DB01
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
Min Typ Max
A1 0.900 1.000 1.100
D1 3.900 4.000 4.100
D2 0.950 1.000 1.050
R1 0.350 0.400 0.450
E1 2.900 3.000 3.100
E2 1.450 1.500 1.550
L1 0.650 0.700 0.750
L2 0.850 0.900 0.950
N1 1.000 1.050 1.100
N2 0.400 0.450 0.500
T1 0.350 0.400 0.450
T2 0.550 0.600 0.650
G1 3.050 3.100 3.150
G2 3.750 3.800 3.850
G3 2.050 2.100 2.150
G4 2.750 2.800 2.850
G5 0.250 0.300 0.350
G6 0.050 0.100 0.150
G7 0.500 0.550 0.600
G8 0.800 0.850 0.900
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
14/16 Doc ID 17924 Rev 8
Page 15
MP34DB01 Revision history
8 Revision history
Table 11. Document revision history
Date Revision Changes
28-Mar-2011 1 Initial release
05-Apr-2011 2 Updated Ta b le 3 and Ta b le 5
21-Oct-2011 3 Added max. peak temperature T
18-Nov-2011 4
04-Jan-2012 5
20-Mar-2012 6
07-May-2012 7 Added V
05-Jul-2012 8
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 8 15/16
Page 16
MP34DB01
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16/16 Doc ID 17924 Rev 8
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