3848 Datasheet (Allegro MicroSystems) - DUAL-CONVERSION AM RECEIVER

3848, DUAL-CONVERSION AM RECEIVER

3848 DUAL-CONVERSION AM RECEIVER 3848 Providing the AM signal processing functions for an electronically tuned AM receiver (ETR), the A3848EEQ includes two balanced mixers, a crystal local oscillator, an L/C-tuned local oscillator, oscillator buffer, IF amplifier, AM detector, scan control detectors, and a switchable voltage regulator.

This dual-conversion device typically mixes the incoming RF up to a first IF of 10.7 MHz, then down to 450 kHz, and then detects the audio.

The addition of a JF

3848 Features

* for scanning. The A3848EEQ uses the dual criteria of frequency and amplitude for establishing a valid stop. Tuning accuracy (frequency criterion) is established by evaluating phase shift across the detector coil. The circuitry is similar to that used in FM discriminators. Because this detection syst