The TDA1072A integrated AM receiver circuit is an AM receiver that performs the active and part of the filtering functions of an AM radio receiver. It is intended for use in mains-fed home receivers and car radios. The circuit can handle oscillator frequencies up to 50 MHz and r.f. signals up to 500 mV. It minimizes r.f. radiation and sensitivity to interference with an almost symmetrical design. The voltage-controlled oscillator provides low distortion and high spectral purity signals over the entire frequency range, even with variable capacitance diodes. Band switching diodes can be easily applied if needed. Selectivity is achieved with a block filter before the i.f. amplifier. The circuit features inputs protected against damage by static discharge, gain-controlled r.f. stage, double balanced mixer, separately buffered voltage-controlled and temperature-compensated oscillator, gain-controlled i.f. stage with wide a.g.c. range, full-wave balanced envelope detector, internal generation of a.g.c. voltage with possibility of second-order filtering, buffered field strength indicator driver with short-circuit protection, a.f. preamplifier with possibilities for simple a.f. filtering.
