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TDA3845 - Quasi split-sound circuit and AM demodulator

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General Description

The TDA3845 is a quasi split-sound IF circuit which is designed to provide high performance television FM/AM sound.

QUICK REFERENCE DATA SYMBOL VP1 VP2 IP V1-16(RMS) V12-13(RMS) (S +W)/W pin 14 pin 11 (not for TDA3845T) supply current minimum IF input voltage (RMS value) IF control range intercarrier output voltage 5.5 MHz (RMS value) signal-to-weighted-noise ratio (relative to 1 kHz;

50 kHz deviation) at 5.5 MHz for 2T/20T at 5.742 MHz for 2T/20T V6-13(RMS) (S +W)/W THD Tamb AF output voltage AM (RMS value) signal-to-weighted-noise ratio;

Overview

INTEGRATED CIRCUITS DATA SHEET TDA3845; TDA3845T Quasi split-sound circuit and AM demodulator Objective specification File under Integrated Circuits, IC02 January 1993 Philips Semiconductors Objective specification Quasi.

Key Features

  • Power supply from 5 V (200 mW) to 8 V source also an alternative 12 V source (12 V not for TDA3845T).
  • Gain controlled wideband IF amplifier (AC coupled with three stages).
  • High precision internal 90° phase shifter for quadrature demodulator.
  • Amplitude detector for gain control which operates as a peak detector for FM sound and as a mean level detector for AM sound (switchable).
  • In-phase wideband synchronous demodulator for AM detection TDA3845; TDA3.

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