BL-21994-000 Knowles Acoustics, BL-21994-000 Datasheet - Page 10

• Manufacturer Part Number: BL-21994-000
• Description: MIC ASSY PIEZO INSTR W/38" CABLE
• Manufacturer: Knowles Acoustics
• Series: BLr
• Type: Piezo Condenserr

Specifications of BL-21994-000

• Sensitivity: -69dB ±3dB
• Voltage - Rated: 3V
• Current: 160µA
• Size / Dimension: Circular - 12.7mm Dia x 25.4mm H
• Impedance: 4K Ohm
• Frequency: 20Hz ~ 10kHz
• Termination: Wire Leads
• Direction: Omnidirectional
• Port Location: Top
• Diameter: 12.7 mm
• Transducer Function: Microphone
• Device Type: Microphone
• Directivity: Omni
• External Diameter: 12.7mm
• Output Impedance: 4000ohm
• Length: 25.4mm
• Outer Diameter: 12.7mm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Filter Type: -
• S/n Ratio: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 423-1002; BL-1994; BL-21994; BL1994

10
SPECIALTY TRANSDUCERS – Microphones
EK/EL SERIES
Omnidirectional (EK), Unidirectional (EL) 4.00 x 5.59 x 2.28 (mm)
EK omnidirectional microphones provide a unique combination of size, performance
and value. Its high electroacoustic sensitivity and low noise make this microphone
an excellent choice for applications where space allows. These popular microphones
are available in many model varieties.
NR SERIES
Noise Canceling 4.00 x 5.59 x 2.28 (mm)
The NR Series close talking microphones deliver state-of-the-art noise canceling performance.
NR microphones are used as headset microphones in the most demanding communication
and speech recognition environments. The NR Series microphones are available in boom
microphone packages. (See the FB Series and PNR/PWP Series for details.)
Note: All performance curves are typical
M M o o d d e e l l
EK-23024-C36
EK-23024-P07
EK-23027-C36
EK-23028-C36
EK-23033-C36
EK-23132-000
EK-23133-C36
EK-23142-C37
EL-23078-000
M M o o d d e e l l
NR-23158-000
NR-23159-000
NR-23160-000
NR-25994-000
– Microphone
Sensitivity @1kHz
Sensitivity @1kHz
– Microphone
(dB re1V/1Pa)
(dB re1V/1Pa)
-33.0±2
-33.0±2
-33.0±2
-37.0±3
-33.0±2
-33.0±2
-33.0±2
-33.0±2
-33.0±2
-38.0±3
-52.0±3
-44.0±3
-38.0±3
•
•
•
•
•
•
•
•
•
•
•
•
Integral FET amplifier
Diaphragm responds to pressure differential giving
high rejection of background noise
Withstands severe environmental conditions
Low vibration sensitivity
High electoacoustical sensitivity
Superior noise canceling performance
Lead attachment available
High resistance to mechanical shock
Available with RFI suppression
Various port locations available
Wide range of frequency responses
High S/N performance
DC Supply (Vdc)
DC Supply (Vdc)
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
1.3
1.3
1.3
1.3
Current Drain (uA)
Current Drain (uA)
Max. Amplifier
Max. Amplifier
www.knowles.com
200
700
50
50
50
50
50
50
50
50
50
50
50
Max. “A” Weighted
Max. “A” Weighted
Equivalent SPL)
Noise (1 kHz
Noise (dBV)
100.0 dB
100.0 dB
26.0 dB
26.0 dB
26.0 dB
26.0 dB
26.0 dB
26.0 dB
31.0 dB
-100
-100
-100
-100
-40
-50
-60
-70
-80
Impedance (Ohms)
Impedance (Ohms)
-40
-50
-60
-70
-80
100
Nominal Output
Nominal Output
5 6 7 8 9
4400
4400
4400
4400
4400
4400
4400
4400
4400
4400
2500
4400
4400
2
100
3
2
4
5
3
6 7 8 9
4
FREQUENCY (Hz)
Comments
3-wire, 1 m Shielded Cable
5 6 7 8 9
3-wire
2-wire
2-wire
3-wire
1k
RFI Improved Version
RFI Improved Version
RFI Improved Version
RFI Improved Version
RFI Improved Version
RFI Improved Version
FREQUENCY (Hz)
Comments
1k
2
2
3
3
4
4
5
5 6 7 8 9
6 7 8 9
10k
10k