®
EK
Features
SERIES
Actual Size
•
Electret condenser microphone
•
High electroacoustic sensitivity
•
Lowest noise Knowles microphone
•
High resistance to mechanical shock
•
Rugged construction to withstand
•
Low vibration sensitivity
severe environmental conditions
•
Various responses available
•
Available with RFI suppression
™
Standard Response
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1 Pa (N/m
2
)
-40
-45
-50
-55
-60
-65
-70
-75
-80
100
EK-3024/5024
EK-3027
EK-3032
2
3
4
5
6
7
8
9
1000
2
3
4
5
6
7
8
9
10000
FREQUENCY IN HERTZ
Open circuit sensitivity with 1.3VDC supply
®
data sheet
Specification Data
Power Requirements
Supply Voltage (V
S
)
range: 0.9 to 10V
DC
typical: 1.3V
DC
EK Series
Quiescent Current Drain (@ V
S
= 1.3V
DC
)
typical: 19µA
maximum: 50µA
Load Voltage (V
L
)
range: 0.2 to 0.9V
DC
typical: 0.5V
DC
Output Noise Level
(A-weighted)
Performance
Response/Sensitivity
see curves, pages 1, 4-6
Sensitivity Range @ primary test frequency
Ski Slope and Step responses: ±3dB
all other responses: ±2dB
Low Supply Voltage Sensitivity Loss
(V
s
reduced from 1.3 to 0.9V
DC
)
typical: 0.3dB
maximum: 3.0dB
Humidity Coefficient of Sensitivity
typical: 0.02dB per %RH
(in the absence of condensation)
Output Impedance @ 1kHz
range: 2.8 to 6.8kΩ
nominal: 4.4kΩ
Acoustic Polarity
Increased pressure at sound inlet
causes a positive going voltage to
appear at the output terminal, relative
to the negative terminal
Power Supply Feedthrough Attenuation
typical: 14dB, output-referred
typical: -103dBV*
maximum: -100dBV (Ski Slope models)
Input-Referred Noise Level*
(A-weighted, 1kHz ref.)
typical: 24dB SPL
maximum: 26dB SPL
Input-Referred Vibration Sensitivity*
(1g acceleration, 1kHz ref.)
maximum: 62dB SPL
Temperature Range
operating: -17°C to 63°C
storage: -40°C to 63°C
ESD Tolerance
MIL-STD-750 Class 1 rating
EOS/ESD-S5.1-1993 Class 2 rating
*For standard, damped, undamped, and broadband models only
Mechanical
Weight
0.13 grams
Dimensions
See outline drawings, page 7
Case Material
Type 305 stainless steel
Solder Content
Sn63Pb37
Base: ET-3042
Nest Plate: ET-800
Back Plate: ET-900
Optional Soldering Fixture
2
Model Variations
EK Series
Model
EK-3024
EK-3027
EK-3028
EK-3029
EK-3031
EK-3032
EK-3033
EK-3091
EK-3092
EK-3103
EK-3115
EK-3132
EK-3133
EK-3142
EK-5024
EK-5033
EK-7136
EK-7164
EK-7276
EK-9874
Port
12S
0KP
12S
12S
12S
3S
12S
0KP
0KP
0KPL
12S
Ka
12SL
0KP
12S
12S
12S
3S
12S
12S
Response
Standard
Standard
6dB/octave Ski Slope
12dB/octave Ski Slope
Step
Standard
Damped Peak
12dB/octave Ski Slope
6dB/octave Ski Slope
Broadband
Step
Broadband
Broadband
Damped Peak
Standard (Screenless)
Damped Peak (Screenless)
Undamped Peak
Damped Peak
Damped Peak
12dB/octave Ski Slope
Microphones are also available with RFI suppression filters.
Other model variations available upon request. Contact
Knowles Electronics for details.
®
3
Damped Peak Response
-40
-45
-50
-55
-60
-65
-70
-75
-80
100
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1Pa (N/m2)
EK-3033/3142
EK-5033/7276
2
3
4
5
6
7
8 9
1000
2
3
4
5
6
7
8 9
10000
FREQUENCY IN HERTZ
Open circuit sensitivity with 1.3VDC supply
Undamped Peak Response
-40
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1Pa (N/m2)
EK-7136
-45
-50
-55
-60
-65
-70
-75
-80
100
2
3
4
5
6
7
8 9
1000
2
3
4
5
6
7
8 9
10000
FREQUENCY IN HERTZ
Open circuit sensitivity with 1.3VDC supply
®
4
6dB/Octave Ski Slope Response
-40
-45
-50
-55
-60
-65
-70
-75
-80
100
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1Pa (N/m2)
EK-3028
EK-3092
2
3
4
5
6
7
8 9
1000
2
3
4
5
6
7
8 9
10000
FREQUENCY IN HERTZ
Open circuit sensitivity with 1.3VDC supply
12dB/Octave Ski Slope Response
-40
-45
-50
-55
-60
-65
-70
-75
-80
100
SENSITIVITY IN dB RELATIVE TO 1.0V/0.1Pa (N/m2)
EK-3029
EK-3091
2
3
4
5
6
7
8 9
1000
2
3
4
5
6
7
8 9
10000
FREQUENCY IN HERTZ
Open circuit sensitivity with 1.3VDC supply
5
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