NR-23158-000 Knowles Acoustics, NR-23158-000 Datasheet - Page 26

MIC ELECTRET NOISE CANCELLING

NR-23158-000

Manufacturer Part Number
NR-23158-000
Description
MIC ELECTRET NOISE CANCELLING
Manufacturer
Knowles Acoustics
Series
NRr
Type
Electret Condenserr
Datasheets

Specifications of NR-23158-000

Sensitivity
-49dB ±3dB
Voltage - Rated
1.3V
Current
50µA
Size / Dimension
Rectangular - 5.56mm L x 3.99mm W x 2.21mm H
Impedance
4.4K Ohm
Frequency
100Hz ~ 4kHz
Termination
Solder Pads
Direction
Noise Cancelling
Port Location
Bottom and Top
Dimensions
4 mm L x 5.59 mm W x 2.28 mm D
Depth
2.28 mm
Length
4 mm
Width
5.59 mm
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Filter Type
-
S/n Ratio
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
26
MICROPHONES
Microphones measure sound pressure. Inside a Knowles microphone is a thin flexible diaphragm, an electrically
charged plate, and an amplifier (Fig. 1). The output voltage is proportional to changes in the small separation
between the diaphragm and the charged plate (Fig. 2).
As sound pressure inside the front cavity increases, the diaphragm is pushed closer to the plate. As the
pressure decreases, it moves further away. The motion of the diaphragm produces a small electrical signal that
is amplified by a miniature circuit inside the microphone.
The sensitivity of a typical Knowles’ microphone is measured in units of dB relative to 1 Volt per 0.1 Pascal.
Fig 1: Cross section of a Knowles EM microphone
FIG. 2: EM diaphragm and electret
MICROPHONE AND SPEAKER BASICS
MICROPHONE AND SPEAKER BASICS
AMPLIFIER
OUTPUT TERMINAL
CHARGE PLATE
CHARGE PLATE
DIAPHRAGM
DIAPHRAGM
www.knowles.com
FRONT CAVITY
AIR GAP SEPARATION
WIRE
SOUND PRESSURE

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