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3845 - AM NOISE BLANKER

General Description

Previous attempts at suppression of impulse noise in AM receivers have used a variety of approaches ranging from gating the signal OFF at the antenna to simply clipping (limiting) any signal that was larger than the average modulation.

Key Features

  • I I I I I I I RF Blanking to 30 MHz Single-Channel or Stereo Audio Blanking Adjustable RF and Audio Blanking Time Adjustable Audio Blanking Delay Sample-and-Hold MOS Audio Gates Internal Voltage Regulation Minimum External Components AM and AM-Stereo Automotive Radios CB Transmitter/Receivers Short-Wave Receivers Mobile Communications Equipment.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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3845 AM NOISE BLANKER This noise blanker integrated circuit contains all of the necessary circuitry for adding an extremely efficient (patented) noise-blanking technique to any type of AM tuner or receiver with RF input frequencies (or a first IF) to 30 MHz. The A3845ELW and A3845SLW feature dual audio channels and are intended for AM-stereo or independent sideband applications. A high input impedance, high-gain, broadband RF amplifier permits these devices to be directly connected to the RF stage of a tuner. Internal AGC circuitry ensures that the noise detection threshold remains constant with changes in input signal level. The RF gate response time is sufficiently fast to blank the noise pulse at the output of the mixer before the IF filter.