MEMS SPEAKERS
ADAP UT-P2019 | DATASHEET
Adap MEMS speakers are ideal for free-field
audio solutions such as wearables. Thanks
to its small size and low weight, Adap offers
maximum flexibility for outstanding design
approaches. Providing a wide bandwidth, it
enables high-res audio applications. Adap
produces tangible, clear and rich sound,
immersing the listener into their personal
audio environment.
FEATURES
APPLICATIONS
Enables modern, lightweight and ergonomic
designs for sophisticated wearables
Adap speakers can be used for free-field
audio systems as well as wearables. For
2-way earphones Adap speakers are suitable
as tweeters.
Seamless integration into acoustic devices
for everyday use
Longer battery life due to the speaker’s low
power consumption
Enhanced cover for handling protection
Competitive sound pressure level
No magnetic field
Low heat generation
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
CONTENT
SPECIFICATIONS 3
MECHANICAL DIMENSIONS 4
FORCE ON SPEAKER 5
TEST CONDITIONS 6
ACOUSTIC PERFORMANCE 8
HANDLING 11
INTEGRATION 12
CONNECTIVITY 13
LABELLING 13
PACKAGING 14
REVISION HISTORY
Released in January 2020
June 2020: Update in power consumption section
2
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
SPECIFICATIONS
General acoustics
fres @ 15 VP
[kHz]
2.9
[-]
0.7
Effective membrane surface – SD
[mm²]
12
Equivalent volume – VAS
[mm³]
40
Front volume inside speaker
[mm³]
5.6
Back volume inside speaker
[mm³]
20
SPL @ 1 kHz / 15 VP
[dB]
51
±3.0
SPL @ 4 kHz / 15 VP
[dB]
71
±3.0
SPL @ 10 kHz / 15 VP
[dB]
74
±3.0
SPL @ 1 kHz / 5 VP
[dB]
40
±3.0
SPL @ 4 kHz / 5 VP
[dB]
60
±3.0
SPL @ 10 kHz / 5 VP
[dB]
63
±3.0
THD @ 1 kHz / 5 VP
[%]
13
+20
THD @ 4 kHz / 5 VP
[%]
4
+3
THD @ 10 kHz / 5 VP
[%]
4
+3
[nF]
38
±20%
Q @ fres / 15 VP
±15%
Acoustics in baffle (IEC 60268-5)
Electronics
Capacity @ 1 kHz / 15 VP
Operating conditions
Maximum AC voltage (peak) – up to 40 kHz
[VP]
15
Maximum DC voltage
[V]
15
[mAP]
200
[mW]
46
Maximum AC current (peak)
Power consumption
with IEC noise (60268-1) @ 60 dB
*Power consumption test conditions can be found in page 6.
3
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
MECHANICAL DIMENSIONS
Cover
Membrane
and plate
Positive
pole contact
Negative
pole contact
Ring
Back port
Protection sheet
Figure 1: Mechanical drawings: perspective view
0.90 ±0.02
1.30 ±0.15
BE
0
0.1
0±
t
por
k
c
Ba
.02
1 ±0
TE
5.50 ±0.02
0.18 ±0.06
Bottom to
contact
2.78 ±0.04
4.70 ±0.10
1.60 ±0.03
1.58 ±0.15
0.80 ±0.05
3.60 ±0.03
DMC format: 8x18.
Pixel size 0.2mm
3.50 ±0.02
0.8
1.12 ±0.05
1.40 ±0.05
6.70 ±0.10
Figure 2: Mechanical drawings: top/down/side view
Mechanics
Size
[mm]
6.7 x 4.7 x 1.58
Total speaker weight
[mg]
80
[mm³]
50
Total speaker cubic volume
4
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
FORCE ON SPEAKER
Type of stress
Maximum handling force [N]
Maximum permanent force [N]
Front face compression
20
13
Side face compression
20
13
3 point bending
10
5
Force on membrane
0
0
Figure 3: Left: front face compression, centre: side face compression, right: 3-point bending
5
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
TEST CONDITIONS
ACOUSTICS
General
Measurement system
Audio Precision APx
Measurement signal
Exp. Sweep
Voltage levels – audio VDC + VAC
15 V + 15 VP
Applied back volume
Open (infinite)
Baffle
Baffle type
IEC 60268-5
Mic distance
3 cm
Reference distance
10 cm
Microphone
GRAS 46AC
Microphone diameter
1/2”
BAFFLE MEASUREMENT ADAPTER
DETAIL A
MEMS Speaker
4xPogo-pins
3
0.3
Sealing Gasket
IEC Baffle
A
Sealing O-Ring
Figure 4: The outlet through the baffle for the speaker has the same
shape as the inside of the speaker cover
6
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
POWER CONSUMPTION AND REFERENCE DRIVING CIRCUIT
Power consumption is measured with one Adap MEMS speaker, including the typical driving circuitry with the
DC boost converter TPS61046 and the amplifier TI LM4858. The main blocks are presented in Figure 2 and
Figure 3.
Condition: Supply voltage 3.6 V; speaker placed in baffle; all noise signals with high pass filter 2nd order
@ 2 kHz.
L1
10uH
+1.8V to +5.5V
A1
A2
C1
1uF
10V
C1
U1
VIN
SW
GND VOUT
EN
FB
+15V
B2
C2
B1
TPS61046
VB_ENABLE
GND
C2
10uF
25V
R1
536k
R2
30k
GND
GND
Figure 5: TPS61046 boost converter including needed passive components
GND
+2.5V to +5.5V
C3
10uF
10V
4.7uH
C4
1uF
10V
GND
C2
AMP_ENABLE
B2
GAIN
C6
A3
AUDIO_IN
1uF
6.3V
B3
C9
1uF
6.3V
GND
C5
1uF
25V
U2
C3
GND
D1
L2
VDD
SHDN_N
GAIN
IN+
IN-
SW
VBST
VAMP
OUT+
OUTSGND
PGND
D2
GND
D1
C1
A1
C7
B1
C8
A2
D3
1uF
35V
+15V
R3
10K
MEMs_BE
MEMs_TE
1uF
35V
R4
10K
LM48580
GND
GND
Figure 6: LM48580 amplifier, including needed passive components
The boost converter is configured to provide a constant 15 VDC offset for the amplifier. The amplifier circuit
itself is based on the typical application diagram from the LM48580 datasheet. It is based on a single-ended
input signal but can also be modified according to the datasheet to a differential input.
7
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
ACOUSTIC PERFORMANCE
ACOUSTIC PERFORMANCE IN BAFFLE (IEC 60268-5)
90
80
SPL10cm [dB]
70
60
50
40
1000
2000
3000
5000
7000
Frequency [Hz]
10000
20000
30000
40000
20000
30000
40000
Figure 7: SPL @ 15 VP drive*
50
45
40
THD [%]
35
30
25
20
15
10
5
0
1000
2000
3000
5000
7000
Frequency [Hz]
10000
Figure 8: THD 60 dB SPL @ 4 kHz, corresponds to 5 VP
Red lines in figure 7 indicate the limits. Test limits are used to establish
incoming inspection acceptance/rejection criteria, correlation of
test equipment with USound is also a requirement for elimination of
equipment and test method variation.*
8
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
GROUP DELAY
1
Group Delay [ms]
0,8
0,6
0,4
0,2
0
1000
2000
3000
4000
5000 6000
8000
Frequency [Hz]
10000
20000
30000
40000
2,2
2,4
Figure 9: Sampling frequency 96 kHz.
Time delay between speaker and microphone compensated.
IMPULSE RESPONSE
Impulse Response [Pa/V]
0,02
0,01
0
-0,01
-0,02
-0,2
0
0,2
0,4
0,6
0,8
1
1,2
Time [ms]
1,4
1,6
1,8
2
Figure 10: Sampling frequency 96 kHz.
Time delay between speaker and microphone compensated.
9
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
ACOUSTIC PERFORMANCE USING
THE CARME TEST BOX IN FREE FIELD
To analyse the performance of the Adap MEMS
speakers, the Carme test box is available. With a back
volume of 100 mm³, Carme provides the necessary
sealing to avoid an acoustic short circuit and offers a
convenient way to connect Adap to USound‘s linear
amplifier, Amalthea.
To set up the Carme test box, unscrew and separate
the PCB from the shell. Remove the housing gasket
and place the MEMS speaker with the contact side up.
Place the PCB by taking care to match the orientation
marks with those on the speaker. Tighten the screws
for proper sealing. Using the Carme test box, Adap
MEMS speakers can be measured in free field.
Figure 11: Positive input (+) blue and negative input
(-) green. The colour coding matches the outputs
of Amalthea
90
Reference adapter in baffle
Carme-box in free field
80
SPL10cm [dB]
70
60
50
40
1000
2000
3000
4000
5000
6000
8000
Frequency [Hz]
10000
20000
30000
40000
Figure 12: Adap SPL measurement in the Carme test box (10 cm) in free field
10
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
HANDLING
GENERAL
It needs to be considered that MEMS devices consist of silicon structures, and therefore, they should be
handled with care. Any bending of the MEMS speakers must be avoided while handling, during the assembly
process and when permanently inside an application, otherwise the speaker can be damaged.
TWEEZERS
It is recommended to grab the speakers from the sides with blunt curved tweezers and avoid touching the
membrane in any case to preserve its functionality and form. Using sharp tweezers while manipulating the
speakers can lead to accidentally piercing the membrane and to a loss of functionality.
The risk to damage the speaker can be further minimized if the speaker is handled with the membrane facing
down, as shown in the picture below.
Figure 13: Left: Recommended tweezer type. Right: Not recommended tweezer type
11
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
INTEGRATION
It needs to be considered that MEMS devices consist of silicon structures, and therefore, they should be
handled with care. Any bending of the MEMS speakers must be avoided while handling, during the assembly
process and when permanently inside an application, otherwise the speaker can be damaged.
To avoid bending of the speaker, it’s recommended that just the defined contact areas are in touch with the
application at front side and back side of the speaker.
Contact area
0,81
0,89
Contact area
0,81
0,89
Figure 14: Recommended contact surfaces at back side (right) and front side (left) of MEMS speaker
12
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
CONNECTIVITY
+
The speaker is driven by applying voltage between
the + and the - connection. The potential of + has to
be always equal or higher than the -. To ensure this
a DC voltage together with the AC signal has to be
applied on +.
Attention: The AC peak voltage must always be
smaller than or equal to the DC voltage.
The membrane will move downwards/inside by applying a positive voltage on the + connection.
_
Figure 15: Electrical connections of the speaker
back side
Each speaker is equipped with an 8 x 18 digital
matrix code (DMC)
DMC Size: 3.6 mm x 1.6 mm
3.60 ±0.03
DMC format: 8x18.
Pixel size 0.2mm
LABELLING
Pixel size: 0.2 mm
Data format corresponds to the production date:
NNYCCDSSSS. For example: 0191024022
1.60 ±0.03
Figure 16: DMC at speaker backside
02
NN
Speaker type
(01 = Adap;
02= Achelous)
13
9
Y
10
2
4022
CC
D
SSSS
Week day
(First day starts
on Sunday)
Serial number
Year
Calendar week
(Last digit of
the year)
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
PACKAGING
Thickness: 0.5 mm
QTY 150 PCS
82,26
7
ESD FOAM SUPPORT
SIZE: 325 X 138 X 13
136 ±0,8
68 ±0,8
161 ±0,8
322 ±0,8
10,90
85
150 X 5 = 750 PCS
plus 1 x empty top tray
158
342
200
750 X 9 = 6750 PCS
40
0
600
Figure 17: Packaging in tray and carton
14
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
IMPORTANT NOTICE AND DISCLAIMER
USound GmbH (“USound”) makes no warranties for the use of USound products, other than those expressly
contained in USound’s applicable General Terms of Sale, located at www.usound.com. USound assumes no
responsibility for any errors which may have crept into this document, reserves the right to change devices or
specifications detailed herein at any time without notice, and does not make any commitment to update the
information contained herein. No license to patents or other intellectual property rights of USound are granted
in connection with the sale of USound products, neither expressly nor implicitly.
In respect of the intended use of USound products by the customer, the customer is solely responsible for observing existing patents and other intellectual property rights of third parties and for obtaining, as the case may be, the necessary licenses. For more information about USound patents visit
https://www.usound.com/patents/.
Important note: The use of USound products as components in medical devices and/or medical applications,
including but not limited to, safety and life supporting systems, where malfunctions of such USound products
might result in damage to and/or injury or death of persons is expressly prohibited, as USound products are
neither destined nor qualified for use as components in such medical devices and/or medical applications. The
prohibited use of USound products in such medical devices and/or medical applications is exclusively at the
risk of the customer.
15
USound GmbH | Adap UT-P2019 Datasheet
Released in January 2020 | Updated in June 2020
www.usound.com | sales@usound.com
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