EA-21843-000

Sensitivity:	-59dB ±3dB @ 74dB SPL
Shape:	Rectangular
Height (Max):	0.089" (2.26mm)
Size / Dimension:	0.219" L x 0.157" W (5.56mm x 3.99mm)
Termination:	Solder Pads
Port Location:	Side
Current - Supply:	50µA
Voltage - Rated:	1.3V
Impedance:	3.5 kOhms
S/N Ratio:	--
Series:	EA
Frequency Range:	100Hz ~ 4.25kHz
Direction:	Omnidirectional
Output Type:	Analog
Type:	Electret Condenser
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

EA-21843-000 is a tiny and low-cost microphone that is suitable for applications including hearing aids and hearing test devices. It has excellent sensitivity and low noise characteristics, making it ideal for such applications. It is a capacitive type microphone, which means it works by detecting the minute changes in the capacitive properties of its diaphragm when sound waves create mechanical vibrations in the air. This article will discuss the working principle of EA-21843-000 as well as applications where it is typically used.

Capacitive Microphones

Capacitive microphones are, in essence, a type of capacitor, where the two "plates" are formed by the backplate and diaphragm. The diaphragm is a thin flexible plastic film which vibrates when sound waves enter it. This in turn causes the capacitance of the microphone to change, as the distance between the diaphragm and the backplate alters subtly with each sound wave. The capability of the microphone to detect these changes is known as its sensitivity, and is a measure of the microphone\'s ability to accurately detect sound waves entering it.EA-21843-000 is a highly sensitive, capacitive-type microphone. The diaphragm is made from an ultra-thin polymer and is precisely positioned in the housing to ensure a high degree of sensitivity. It has a low noise amplifier that amplifies the slight changes in capacitance created by the sound waves according to the microphone\'s sensitivity specifications.

Working Principles

EA-21843-000 is based on the working principle of capacitive microphones, where sound waves entering the diaphragm cause tiny, periodic changes in the capacitance of the microphone. These changes are detected by an amplifier, which then amplifies them according to the microphone\'s sensitivity specification. The signals are then sent to an analog-to-digital converter (ADC) where they are converted into digital format and can then be used by the device in which they are being used.The microphone is also equipped with a specialised filter that reduces noise by filtering out higher frequency components. This makes the microphone less sensitive to background noise, thereby improving its signal-to-noise ratio. This filter also helps to attenuate any spurious frequencies that the microphone might detect, resulting in better sound quality. Additionally, the microphone also has a built-in pre-amplifier that amplifies the signal before it is sent to the ADC, so that the required output level is maintained.

Applications of EA-21843-000

Due to its sensitivity, ultra-thin diaphragm and low-noise performance, the EA-21843-000 is suitable for a variety of applications in the hearing healthcare industry. These include hearing aid devices, hearing testing devices as well as applications where sound needs to be detected in areas with extreme environmental conditions such as high temperatures and humidity.The microphone is also used in other areas where a high level of sound accuracy is required, such as laboratory and industrial environments. The microphone can be used in applications such as automated testing, where it can be used to detect acoustic signals with a high level of accuracy, and also for general sound-level monitoring.

Conclusion

EA-21843-000 is a highly sensitive, low-noise capacitive microphone used in applications including hearing healthcare, laboratory and industrial environments. Its ultra-thin diaphragm and pre-amplifier enable it to detect audio signals accurately and with minimal noise. It also has a specialised filter that can reduce high-frequency noise components, improving its signal-to-noise ratio. The microphone is simple to use and is an ideal choice for applications where a high degree of sound accuracy is required.

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