GR581 Datasheet (Gennum Corporation) - Adaptive Highpass Filter

GR581, Adaptive Highpass Filter

The GR581 is a level-sensitive, adaptive highpass filter comprised of a current controlled highpass filter, a half- wave rectifier, a voltage regulator for microphone bias and a separate preamplifier.

The internal rectifier senses the long term average signal level and controls the filter response b

GR581 Features

* unity gain 12 dB/oct. highpass Butterworth filter

* adaptive frequency range from 200 Hz to 2 kHz

* rectifier threshold set to 82 dBSPL (adjustable)

* low noise, typically 2.6 µV

* 300 µA typical current drain

* operates from 1.1 to 3 VDC

* p