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GR581 - Adaptive Highpass Filter

General Description

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.

Key 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.
  • preamplifier with 56 dB open loop gain.

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Datasheet Details

Part number GR581
Manufacturer Gennum Corporation
File Size 104.55 KB
Description Adaptive Highpass Filter
Datasheet download datasheet GR581 Datasheet

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Full PDF Text Transcription (Reference)

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Adaptive Highpass Filter with Independent Gain Block GR581 DATA SHEET 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 • preamplifier with 56 dB open loop gain DESCRIPTION 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 by setting the control current of the filter.