CD00284650

CD00284650
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 3x4x1 4LD
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
Table 1.
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.
Device summary
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
This is information on a product in full production.
Doc ID 17924 Rev 8
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www.st.com
1
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
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MP34DB01
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
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
Recommended soldering profile limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
RHLGA 3 mm x 4 mm x 1 mm 4-lead package dimensions . . . . . . . . . . . . . . . . . . . . . . . . 14
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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List of figures
MP34DB01
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
4/16
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Timing waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical frequency response normalized at 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
MP34DB01 electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
MP34DB01 electrical connections for stereo configuration . . . . . . . . . . . . . . . . . . . . . . . . 12
Recommended soldering profile limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
RHLGA 3 mm x 4 mm x 1 mm 4-lead package outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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MP34DB01
1
Pin description
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
5 (ground ring)
GND
Left/right PDM data output
0 V supply
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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.
Symbol
Acoustic and electrical characteristics
Parameter
Test condition
Vdd
Supply voltage
Idd
Current consumption in
normal mode
IddPdn
Current consumption in
power-down mode(3)
Scc
Short-circuit current
AOP
Acoustic overload point
So
Min.
Typ.(1)
Max.
Unit
1.64
1.8
3.6
V
Mean value(2)
0.65
mA
20
µA
1
10
120
at 1 kHz, 1 Pa
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
TWK
Input clock frequency
Wake-up time
1
(5)
-26
dBSPL
Sensitivity
(4)
-29
mA
2.4
-23
dBFS
3.25
MHz
10
ms
-40
+85
°C
Guaranteed by design
Top
Operating temperature range
VIOL
Low level logic
input/output voltage
Iout = 1 mA
-0.3
0.35xVdd
V
VIOH
High level logic
input/output voltage
Iout = 1 mA
0.65xVdd
Vdd+0.3
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.
Table 4.
6/16
Distortion specifications
Parameter
Test condition
Value
Distortion
100 dBSPL (50 Hz - 4 kHz)
< 1% THD + N
Distortion
115 dBSPL (1 kHz)
< 5% THD + N
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MP34DB01
2.2
Acoustic and electrical specifications
Timing characteristics
Table 5.
Timing characteristics
Parameter
Description
fCLK
Clock frequency for normal mode
fPD
Clock frequency for power-down mode
TCLK
Clock period for normal mode
Data enabled on DATA line, L/R pin = 1
TR,DIS
Data disabled on DATA line, L/R pin = 1
TL,DIS
Max
Unit
1
3.25
MHz
0.23
MHz
1000
ns
308
TR,EN
TL,EN
Min
30
(1)
ns
16(1)
Data enabled on DATA line, L/R pin = 0
30
(1)
ns
ns
16(1)
Data disabled on DATA line, L/R pin = 0
ns
1. From design simulations
Figure 2.
Timing waveforms
TCLK
CLK
TL,DIS
TR,EN
TR,DIS
High Z
PDM R
High Z
TL,EN
PDM L
High Z
High Z
AM045165v1
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Acoustic and electrical specifications
2.3
MP34DB01
Frequency response
Figure 3.
Typical frequency response normalized at 1 kHz
10
8
Normalized Sensitivity [dB]
6
4
2
0
-2
-4
-6
-8
-10
10
100
1000
10000
Frequency [Hz]
Table 6.
Frequency response mask for digital microphones
Frequency / Hz (1)
Lower limit
Upper limit
Unit
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).
8/16
AM045317v1
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MP34DB01
3
Sensing element
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.
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Absolute maximum ratings
4
MP34DB01
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
Vdd
Supply voltage
Vin
Input voltage on any control pin
TSTG
Storage temperature range
ESD
Electrostatic discharge protection
Maximum value
Unit
-0.3 to 6
V
-0.3 to Vdd +0.3
V
-40 to +125
°C
2 (HBM)
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
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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 Table 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
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Application recommendations
6
MP34DB01
Application recommendations
Figure 4.
MP34DB01 electrical connections
CLK
DOUT
C ODE C
Vdd
100 nF
1
4
2
3
L/R
10 µF
5
Top view
AM07964v1
Figure 5.
MP34DB01 electrical connections for stereo configuration
DOUT
CLK
C ODE C
Vdd
Mic2
Mic1
5
1
4
1
4
2
3
2
3
5
Top view
Top view
100 nF
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).
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Doc ID 17924 Rev 8
MP34DB01
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
tp
TP
CRITICAL ZONE
RAMP-UP
TL to T P
TL
TSMAX
TEMPERATURE
7
Package mechanical data
tL
TSMIN
ts
PREHEAT
RAMP-DOWN
T25°C to PEAK
30
Table 9.
60
90
120
150
180
TIME
210
240
270
300
330
360
390
AM045166v1
Recommended soldering profile limits
Description
Average ramp rate
Parameter
Pb free
TL to TP
3 °C/sec max
TSMIN
TSMAX
tS
150 °C
200 °C
60 sec to 120 sec
Preheat
Minimum temperature
Maximum temperature
Time (TSMIN to TSMAX)
TSMAX to TL
Ramp-up rate
Time maintained above liquidous temperature
Liquidous temperature
tL
TL
60 sec to 150 sec
217 °C
Peak temperature
TP
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
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Package mechanical data
Figure 7.
MP34DB01
RHLGA 3 mm x 4 mm x 1 mm 4-lead package outline
E1
L2
C
E
K
T2
T2
M
//
N2
G5xG5 Pin 1 Indicator
K
KC
1
3
2
T1
4
G2
T1
D2
G1
D1
Seating Plane
N1
L1
KE
D
2X
G6
R1
G7
KD
G8
Bottom Port Indicator
E2
G3
A1
G4
Table 10.
8178743_E
BOTTOM VIEW
TOP VIEW
RHLGA 3 mm x 4 mm x 1 mm 4-lead package dimensions
mm
Symbol
14/16
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
M
0.100
K
0.050
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MP34DB01
8
Revision history
Revision history
Table 11.
Document revision history
Date
Revision
Changes
28-Mar-2011
1
Initial release
05-Apr-2011
2
Updated Table 3 and Table 5
21-Oct-2011
3
Added max. peak temperature TP to Table 9
18-Nov-2011
4
Updated SNR typical value in Table 3; document promoted from
preliminary to full datasheet
04-Jan-2012
5
Updated Features and Description
Updated Figure 3: Typical frequency response normalized at 1 kHz
20-Mar-2012
6
Added test condition criterion to PSR in Table 3: Acoustic and
electrical characteristics
07-May-2012
7
Added VIOL, VIOH to Table 3: Acoustic and electrical characteristics
05-Jul-2012
8
Added Section 3: Sensing element
Updated operating temperature range throughout datasheet
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MP34DB01
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