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Microphones

Introduction

Some D-Cerno units have a fixed microphone. This microphone has a unidirectional response for optimum performance even in noisy conditions, and has a very low susceptibility to interference from mobile phones.

Electrical and acoustic properties

Parameter

Description

Transducer type Back electret (condenser)
Operating principle Pressure gradient
Polar pattern Unidirectional, cardioid
Frequency response 130 Hz – 15000 Hz
Nominal impedance 1kOhm (at 1 kHz, drop resistance = 1k2, Vdd = 3.3VDC )
Load impedance > 5kOhm
Max. SPL at 1 kHz 120 dB SPL

Free field sensitivity

7mV/Pa, +/- 3 dB at 1 kHz or (-43dB, 0dB=1V/Pa at 1kHz)

Power supply

3.3V DC, 0.5 mA

Consumption 0.5 mA (without LED ring); max. 25 mA (with illuminated ring)

Creation date: 01/10/2019 10:24 (b.maertens@televic.com)      Updated: 16/10/2019 13:43 (b.maertens@televic.com)