FG-26163-000 Knowles Acoustics, FG-26163-000 Datasheet - Page 29

• Manufacturer Part Number: FG-26163-000
• Description: Microphone
• Manufacturer: Knowles Acoustics
• Series: FG/BFGr
• Type: Electret Condenserr

Specifications of FG-26163-000

• Transducer Function: Microphone
• Device Type: Microphone
• Directivity: Omni
• Connector Type: Solder Pads
• Frequency: 10kHz
• Length: 2.54mm
• Diameter: 2.565 mm
• Sensitivity: -33dB ±3dB
• Voltage - Rated: 1.3V
• Current: 50µA
• Size / Dimension: Circular - 2.565mm Dia x 2.565mm H
• S/n Ratio: -
• Filter Type: -
• Impedance: 4.4K Ohm
• Termination: Solder Pads
• Direction: Omnidirectional
• Port Location: Top
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MICROPHONE AND SPEAKER BASICS
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
OUTPUT TERMINAL
WIRE
AMPLIFIER
SOUND PRESSURE
CHARGE PLATE
DIAPHRAGM
FRONT CAVITY
FIG. 2: EM diaphragm and electret
CHARGE PLATE
DIAPHRAGM
AIR GAP SEPARATION
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Note: All performance curves are typical